bambuddy/backend/app/api/routes/archives.py

import asyncio
import io
import json
import logging
import re as _re
import zipfile
from collections import defaultdict
from datetime import date, datetime, time, timedelta, timezone
from decimal import ROUND_HALF_UP, Decimal
from html import escape as html_escape
from pathlib import Path

from fastapi import APIRouter, Depends, File, Form, HTTPException, Query, Request, UploadFile
from fastapi.responses import FileResponse, Response
from sqlalchemy import and_, case, func, or_, select
from sqlalchemy.ext.asyncio import AsyncSession

from backend.app.core import database
from backend.app.core.auth import (
    MediaOrRequestPrinterScope,
    RequestPrinterScope,
    RequirePermissionIfAuthEnabled,
    probe_permissions_if_auth_enabled,
    require_media_token_ownership,
    require_ownership_permission,
)
from backend.app.core.config import settings
from backend.app.core.database import get_db
from backend.app.core.permissions import Permission
from backend.app.core.printer_scope import PrinterScope
from backend.app.models.archive import PrintArchive
from backend.app.models.filament import Filament
from backend.app.models.printer import Printer
from backend.app.models.spool_usage_history import SpoolUsageHistory
from backend.app.models.user import User
from backend.app.schemas.archive import ArchiveResponse, ArchiveSlim, ArchiveStats, ArchiveUpdate
from backend.app.schemas.print_log import PrintLogResponse
from backend.app.schemas.slicer import SliceRequest
from backend.app.services.archive import ArchiveService
from backend.app.services.bambu_ftp import ftps_handshake_blocked, list_files_result_async
from backend.app.services.design_settings import overrides_from_config
from backend.app.services.filament_requirements import annotate_rack_groups
from backend.app.services.print_confirmation import (
    is_one_tap_request,
    is_unattended_fetch,
    retire_confirm_token,
    stamp_verdict,
)
from backend.app.services.print_storage import (
    REASON_FTP_TRANSFER_FAILED,
    REASON_FTPS_COOLOFF,
    REASON_INTERNAL_HISTORY,
    REASON_INTERNAL_STORAGE,
    REASON_NO_EXTERNAL_STORAGE,
)
from backend.app.services.printer_media import VIDEO_SUFFIXES, match_ipcam_chunks
from backend.app.utils.archive_paths import archive_photos_dir, find_archive_photo
from backend.app.utils.http import build_content_disposition, download_error_response, safe_download_filename
from backend.app.utils.threemf_tools import (
    default_plate_gcode_name,
    expand_to_project_slots,
    extract_embedded_presets_from_3mf,
    extract_nozzle_mapping_from_3mf,
    extract_project_filaments_from_3mf,
    names_carry_gcode,
    select_plate_gcode_name,
)

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/archives", tags=["archives"])
_PRINTER_MEDIA_LIST_TIMEOUT_SECONDS = 8.0

# Path of the embedded slicer config inside a BambuStudio/OrcaSlicer 3MF.
_PROJECT_SETTINGS_PATH = "Metadata/project_settings.config"


def _safe_filename(filename: str) -> str:
    """Extract basename from a client-supplied filename, preventing path traversal.

    Normalizes backslashes (Windows paths) before extracting so that
    '..\\\\..\\\\evil.3mf' is correctly stripped to 'evil.3mf' on Linux.
    """
    return Path(filename.replace("\\", "/")).name


_TIMELAPSE_FILENAME_TS_RE = _re.compile(r"(\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2})")
_DEFAULT_TIMELAPSE_OFFSETS_HOURS: tuple[int, ...] = (0, 8, -8, 7, -7, 1, -1)
_DEFAULT_TIMELAPSE_TOLERANCE = timedelta(hours=4)
_DEFAULT_TIMELAPSE_AMBIGUITY_MARGIN = timedelta(minutes=15)


def _match_timelapse_by_timestamp(
    video_files: list[dict],
    archive_start: datetime | None,
    *,
    tolerance: timedelta = _DEFAULT_TIMELAPSE_TOLERANCE,
    ambiguity_margin: timedelta = _DEFAULT_TIMELAPSE_AMBIGUITY_MARGIN,
    offsets_hours: tuple[int, ...] = _DEFAULT_TIMELAPSE_OFFSETS_HOURS,
) -> tuple[dict | None, timedelta | None]:
    """Pick the timelapse whose filename timestamp best matches the print start time.

    Bambu timelapse filenames embed the printer-local START time (e.g.
    "video_2026-05-08_09-41-29.mp4"). The printer's clock may be offset from the
    server's — especially in LAN-Only mode where NTP is unreachable — so we try a
    small set of common UTC offsets and keep the (video, offset) pair with the
    smallest absolute distance from archive_start. We deliberately do NOT consider
    archive_end here: the filename is start time, not end time, so comparing it to
    completion is not a real signal (Strategy 3 handles end via file mtime).

    Because the offset list densely covers a wide span, an unrelated video's
    filename can coincidentally land near a later print's start at some offset.
    To avoid that false positive, we require the best (video, offset) pair to
    beat the next-best pair *from a different video* by at least `ambiguity_margin`.
    When the top two candidates from different videos are too close to call,
    we return None and let the caller fall back to manual selection.
    """
    if archive_start is None:
        return None, None

    # (diff, video) for every (video, offset) pair within tolerance.
    candidates: list[tuple[timedelta, dict]] = []

    for f in video_files:
        fname = f.get("name", "")
        m = _TIMELAPSE_FILENAME_TS_RE.search(fname)
        if not m:
            continue
        try:
            file_time = datetime.strptime(m.group(1), "%Y-%m-%d_%H-%M-%S")
        except ValueError:
            continue

        for hour_offset in offsets_hours:
            adjusted = file_time - timedelta(hours=hour_offset)
            diff = abs(adjusted - archive_start)
            if diff <= tolerance:
                candidates.append((diff, f))

    if not candidates:
        return None, None

    candidates.sort(key=lambda c: c[0])
    best_diff, best_video = candidates[0]
    best_name = best_video.get("name")

    for diff, video in candidates[1:]:
        if video.get("name") != best_name and (diff - best_diff) < ambiguity_margin:
            # Another video matches almost as well — refuse to auto-pick.
            return None, None

    return best_video, best_diff


async def _claimed_timelapse_stems(db, printer_id: int | None, exclude_archive_id: int) -> set[str]:
    """Video filenames already attached to another archive of this printer (#2704).

    Lets the baseline diff drop a previous print's late-landing video from the
    candidate list without ordering the candidates — ordering could only be done
    on mtime or the filename timestamp, and both come from a clock the printer
    can't sync in LAN-only mode. ``attach_timelapse`` stores the video under the
    printer's own filename and the MP4 conversion keeps the stem, so the stem of
    ``timelapse_path`` is what was claimed.
    """
    if printer_id is None:
        return set()
    rows = await db.execute(
        select(PrintArchive.timelapse_path).where(
            PrintArchive.printer_id == printer_id,
            PrintArchive.id != exclude_archive_id,
            PrintArchive.timelapse_path.is_not(None),
        )
    )
    return {Path(p).stem for p in rows.scalars().all() if p}


def _ensure_archive_visible(
    archive: PrintArchive | None,
    user: User | None,
    can_read_all: bool,
    printer_scope: PrinterScope,
) -> PrintArchive:
    """Per-archive visibility gate for ownership-scoped reads (#1726-adjacent).

    Returns ``archive`` if the caller is allowed to see it; raises 404 otherwise.
    Single enforcement point used by every detail / download / sub-resource
    route so we can't accidentally leak a row through a less-guarded sibling.

    Rules:
      - Missing archive or soft-deleted (``deleted_at != None``) → 404.
      - Caller with ARCHIVES_READ_ALL or auth disabled (``can_read_all=True``,
        ``user`` may be None) → archive returned.
      - Caller without ARCHIVES_READ_ALL and ``archive.created_by_id != user.id``
        → 404, deliberately NOT 403. 403 leaks "this id exists but you can't
        see it" — enumeration-friendly. 404 is indistinguishable from a
        nonexistent id. Pre-GHSA fix the caller saw 200 here (the PoC vector).
      - Ownerless rows (``created_by_id is None``) require ALL — fail-closed
        per ``feedback_no_fail_open_in_auth``.
      - An archive whose printer is outside ``printer_scope`` → 404 (#1727).
    """
    if not archive or archive.deleted_at is not None:
        raise HTTPException(404, "Archive not found")
    # An archive from a printer the caller can't see is as missing as the
    # printer itself (#1727). Archives with no printer stay governed by
    # ownership alone.
    if not printer_scope.allows(archive.printer_id):
        raise HTTPException(404, "Archive not found")
    if can_read_all:
        return archive
    # Auth enabled, caller has _OWN only.
    if user is None:
        # Defensive: should be unreachable (RequirePermissionIfAuthEnabled
        # would have 401'd already), but never trust user identity to be
        # non-None when can_read_all is False.
        raise HTTPException(404, "Archive not found")
    if archive.created_by_id is None or archive.created_by_id != user.id:
        raise HTTPException(404, "Archive not found")
    return archive


def _validate_user_filter_permission(current_user: User | None, created_by_id: int | None):
    """Raise 403 if created_by_id filter is used without stats:filter_by_user permission."""
    if created_by_id is None or current_user is None:
        return
    if current_user.is_admin:
        return
    if not current_user.has_permission(Permission.STATS_FILTER_BY_USER.value):
        raise HTTPException(status_code=403, detail="Permission stats:filter_by_user required")


def _apply_user_filter(conditions: list, created_by_id: int | None):
    """Append created_by_id filter to conditions list if specified."""
    if created_by_id is not None:
        if created_by_id == -1:
            conditions.append(PrintArchive.created_by_id.is_(None))
        else:
            conditions.append(PrintArchive.created_by_id == created_by_id)


def _apply_run_user_filter(conditions: list, created_by_id: int | None):
    """Append created_by_id filter scoped to PrintLogEntry rows."""
    from backend.app.models.print_log import PrintLogEntry

    if created_by_id is not None:
        if created_by_id == -1:
            conditions.append(PrintLogEntry.created_by_id.is_(None))
        else:
            conditions.append(PrintLogEntry.created_by_id == created_by_id)


def compute_time_accuracy(archive: PrintArchive, run_aggregate: dict | None = None) -> dict:
    """Compute actual print time and accuracy for an archive.

    Returns dict with actual_time_seconds and time_accuracy.
    time_accuracy = (estimated / actual) * 100
    - 100% = perfect estimate
    - >100% = print was faster than estimated
    - <100% = print took longer than estimated

    When ``run_aggregate`` indicates the archive has more than one logged
    run (multi-plate file printed plate-by-plate, or reprints), both
    fields are suppressed: ``archive.started_at / completed_at`` reflect
    the LATEST run only, while ``archive.print_time_seconds`` is the
    whole-file estimate (post-#1593 the parser sums across plates), so
    comparing the two describes different scopes. The card-rendering
    frontend falls through to ``archive.print_time_seconds`` for the
    time display and hides the badge when ``time_accuracy`` is null —
    that's the desired "show estimate, no badge" presentation for
    multi-run archives (#1608). Single-run archives keep the original
    badge behaviour verbatim.
    """
    result: dict[str, int | float | None] = {"actual_time_seconds": None, "time_accuracy": None}

    # Multi-run archives: the per-run actual (started_at..completed_at on
    # the archive row) is incommensurable with the whole-file estimate.
    # Both fields are cleared so the card shows estimate + no badge.
    if run_aggregate and (run_aggregate.get("run_count") or 0) > 1:
        return result

    if archive.started_at and archive.completed_at and archive.status == "completed":
        actual_seconds = int((archive.completed_at - archive.started_at).total_seconds())
        if actual_seconds > 0:
            result["actual_time_seconds"] = actual_seconds

            if archive.print_time_seconds and archive.print_time_seconds > 0:
                # Calculate accuracy as percentage
                accuracy = (archive.print_time_seconds / actual_seconds) * 100
                # Sanity check: skip unreasonable values (e.g., manually changed status)
                # Valid range: 5% to 500% (print took 20x longer to 5x faster than estimated)
                if 5 <= accuracy <= 500:
                    result["time_accuracy"] = round(accuracy, 1)

    return result


async def _load_run_aggregates(db: AsyncSession, archive_ids: list[int]) -> dict[int, dict]:
    """Batch-load per-archive run aggregates from PrintLogEntry.

    Returns ``{archive_id: {run_count, last_run_at, total_filament_actual_grams,
    successful_run_count, failed_run_count}}``. Archives with no logged runs are
    absent from the map; callers should treat that as zero/none.
    """
    from backend.app.models.print_log import PrintLogEntry

    if not archive_ids:
        return {}
    rows = await db.execute(
        select(
            PrintLogEntry.archive_id,
            func.count(PrintLogEntry.id).label("run_count"),
            func.max(PrintLogEntry.started_at).label("last_run_at"),
            func.coalesce(func.sum(PrintLogEntry.filament_used_grams), 0).label("total_filament"),
            func.sum(case((PrintLogEntry.status == "completed", 1), else_=0)).label("successful"),
            func.sum(case((PrintLogEntry.status == "failed", 1), else_=0)).label("failed"),
        )
        .where(PrintLogEntry.archive_id.in_(archive_ids))
        .group_by(PrintLogEntry.archive_id)
    )
    aggregates: dict[int, dict] = {}
    for archive_id, run_count, last_run_at, total_filament, successful, failed in rows.all():
        aggregates[archive_id] = {
            "run_count": int(run_count or 0),
            "last_run_at": last_run_at,
            "total_filament_actual_grams": float(total_filament) if total_filament else None,
            "successful_run_count": int(successful or 0),
            "failed_run_count": int(failed or 0),
        }
    return aggregates


def archive_to_response(
    archive: PrintArchive,
    duplicates: list[dict] | None = None,
    duplicate_count: int = 0,
    duplicate_sequence: int = 0,
    original_archive_id: int | None = None,
    run_aggregate: dict | None = None,
) -> dict:
    """Convert archive model to response dict with computed fields."""
    data = {
        "id": archive.id,
        "printer_id": archive.printer_id,
        "project_id": archive.project_id,
        "project_name": archive.project.name if archive.project else None,
        "filename": archive.filename,
        "file_path": archive.file_path,
        "file_size": archive.file_size,
        "content_hash": archive.content_hash,
        "thumbnail_path": archive.thumbnail_path,
        "timelapse_path": archive.timelapse_path,
        "source_3mf_path": archive.source_3mf_path,
        "f3d_path": archive.f3d_path,
        "duplicates": duplicates,
        "duplicate_count": duplicate_count if duplicates is None else len(duplicates),
        "duplicate_sequence": duplicate_sequence,
        "original_archive_id": original_archive_id,
        "print_name": archive.print_name,
        "plate_id": archive.plate_id,
        "print_time_seconds": archive.print_time_seconds,
        "filament_used_grams": archive.filament_used_grams,
        "filament_type": archive.filament_type,
        "filament_color": archive.filament_color,
        "layer_height": archive.layer_height,
        "total_layers": archive.total_layers,
        "nozzle_diameter": archive.nozzle_diameter,
        "bed_temperature": archive.bed_temperature,
        "bed_type": archive.bed_type,
        "nozzle_temperature": archive.nozzle_temperature,
        "sliced_for_model": archive.sliced_for_model,
        "status": archive.status,
        "started_at": archive.started_at,
        "completed_at": archive.completed_at,
        "extra_data": archive.extra_data,
        "makerworld_url": archive.makerworld_url,
        "designer": archive.designer,
        "external_url": archive.external_url,
        "is_favorite": archive.is_favorite,
        "tags": archive.tags,
        "notes": archive.notes,
        "cost": archive.cost,
        "photos": archive.photos,
        "failure_reason": archive.failure_reason,
        # Post-print outcome confirmation (#1898). confirm_token stays
        # server-side — it is a capability and never belongs in a response.
        "user_verdict": archive.user_verdict,
        "user_verdict_source": archive.user_verdict_source,
        "user_verdict_at": archive.user_verdict_at,
        # bool() because the column is nullable to match the migration; the
        # response contract stays a strict bool either way.
        "confirm_requested": bool(archive.confirm_requested),
        "quantity": archive.quantity,
        "energy_kwh": archive.energy_kwh,
        "energy_cost": archive.energy_cost,
        "wear_cost": archive.wear_cost,
        "created_at": archive.created_at,
        # User tracking (Issue #206)
        "created_by_id": archive.created_by_id,
        "created_by_username": archive.created_by.username if archive.created_by else None,
    }

    # Add computed time accuracy fields. ``run_aggregate`` lets
    # ``compute_time_accuracy`` suppress the badge for multi-run archives
    # where the per-run actual / whole-file estimate scopes don't match
    # (#1608).
    accuracy_data = compute_time_accuracy(archive, run_aggregate)
    data.update(accuracy_data)

    if run_aggregate:
        data["run_count"] = run_aggregate.get("run_count", 0)
        data["last_run_at"] = run_aggregate.get("last_run_at")
        data["total_filament_actual_grams"] = run_aggregate.get("total_filament_actual_grams")
        data["successful_run_count"] = run_aggregate.get("successful_run_count", 0)
        data["failed_run_count"] = run_aggregate.get("failed_run_count", 0)

    return data


@router.get("/", response_model=list[ArchiveResponse])
async def list_archives(
    printer_id: int | None = None,
    project_id: int | None = None,
    date_from: date | None = Query(None),
    date_to: date | None = Query(None),
    limit: int = 50,
    offset: int = 0,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """List archived prints."""
    user, can_read_all = auth_result
    visible_to_user_id = user.id if (user is not None and not can_read_all) else None
    service = ArchiveService(db)
    archives = await service.list_archives(
        printer_id=printer_id,
        project_id=project_id,
        date_from=date_from,
        date_to=date_to,
        limit=limit,
        offset=offset,
        visible_to_user_id=visible_to_user_id,
        printer_scope=printer_scope,
    )

    # Get sets of duplicate hashes and duplicate (name, hash) pairs (efficient single queries)
    duplicate_hashes, duplicate_name_hash_pairs = await service.get_duplicate_hashes_and_names()

    # Batch-load duplicate groups once for the current page keys.
    duplicate_hashes_in_page = {
        a.content_hash for a in archives if a.content_hash and a.content_hash in duplicate_hashes
    }
    duplicate_name_hash_keys_in_page = {
        (a.print_name.lower(), a.content_hash)
        for a in archives
        if a.print_name and a.content_hash and (a.print_name.lower(), a.content_hash) in duplicate_name_hash_pairs
    }

    duplicate_meta_by_archive_id: dict[int, tuple[int, int, int]] = {}

    if duplicate_hashes_in_page or duplicate_name_hash_keys_in_page:
        duplicate_group_conditions = []
        if duplicate_hashes_in_page:
            duplicate_group_conditions.append(PrintArchive.content_hash.in_(duplicate_hashes_in_page))
        if duplicate_name_hash_keys_in_page:
            name_hash_conditions = [
                and_(func.lower(PrintArchive.print_name) == name, PrintArchive.content_hash == hash_)
                for name, hash_ in duplicate_name_hash_keys_in_page
            ]
            duplicate_group_conditions.extend(name_hash_conditions)

        duplicate_group_rows = await db.execute(
            select(
                PrintArchive.id,
                PrintArchive.created_at,
                PrintArchive.content_hash,
                func.lower(PrintArchive.print_name).label("print_name_lower"),
            ).where(or_(*duplicate_group_conditions), PrintArchive.deleted_at.is_(None))
        )

        duplicate_groups_by_hash: dict[str, list[tuple[int, datetime]]] = defaultdict(list)
        duplicate_groups_by_name_hash: dict[tuple[str, str], list[tuple[int, datetime]]] = defaultdict(list)

        for archive_id, created_at, content_hash, print_name_lower in duplicate_group_rows.all():
            if content_hash and content_hash in duplicate_hashes_in_page:
                duplicate_groups_by_hash[content_hash].append((archive_id, created_at))
            if (
                print_name_lower
                and content_hash
                and (print_name_lower, content_hash) in duplicate_name_hash_keys_in_page
            ):
                duplicate_groups_by_name_hash[(print_name_lower, content_hash)].append((archive_id, created_at))

        for group in duplicate_groups_by_hash.values():
            if len(group) < 2:
                continue
            group.sort(key=lambda x: x[1])
            original_id = group[0][0]
            duplicate_count = len(group) - 1
            for sequence, (archive_id, _) in enumerate(group):
                duplicate_meta_by_archive_id[archive_id] = (sequence, original_id, duplicate_count)

        # Keep hash-based grouping precedence; name/hash groups only fill missing items.
        for group in duplicate_groups_by_name_hash.values():
            if len(group) < 2:
                continue
            group.sort(key=lambda x: x[1])
            original_id = group[0][0]
            duplicate_count = len(group) - 1
            for sequence, (archive_id, _) in enumerate(group):
                duplicate_meta_by_archive_id.setdefault(archive_id, (sequence, original_id, duplicate_count))

    run_aggregates = await _load_run_aggregates(db, [a.id for a in archives])

    # Build response with duplicate sequence and original archive ID pre-computed
    result = []
    for a in archives:
        has_hash_dup = a.content_hash in duplicate_hashes if a.content_hash else False
        has_name_dup = (
            bool(a.print_name and a.content_hash)
            and (a.print_name.lower(), a.content_hash) in duplicate_name_hash_pairs
        )
        has_duplicate = has_hash_dup or has_name_dup

        # Pre-compute duplicate sequence and original archive ID
        duplicate_sequence = 0
        original_archive_id: int | None = None
        duplicate_count = 1 if has_duplicate else 0

        if has_duplicate and a.id in duplicate_meta_by_archive_id:
            duplicate_sequence, original_archive_id, duplicate_count = duplicate_meta_by_archive_id[a.id]

        result.append(
            archive_to_response(
                a,
                duplicate_count=duplicate_count,
                duplicate_sequence=duplicate_sequence,
                original_archive_id=original_archive_id,
                run_aggregate=run_aggregates.get(a.id),
            )
        )
    return result


@router.get("/no-3mf-warning")
async def no_3mf_warning(
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
):
    """Whether to nudge the user about a print that archived without its 3MF,
    and why. True iff any archive in the last 30 days was created via the
    no-3MF fallback path.

    Also returns ``reason``, because the advice differs and the original
    single-cause wording sent people the wrong way. Historically the only
    known cause was install step 4 ("Store sent files on external storage")
    being off in the slicer, so the banner said so unconditionally. On
    H2-series, P2S and X2D that advice is actively wrong: the setting is already
    on and turning it on again changes nothing, because the printer keeps the
    sliced file on internal storage that FTPS does not serve at all (#2780).

    ``reason`` is the slug from :mod:`print_storage` when we recorded one,
    else None for the original slicer-setting case. When archives disagree the
    most specific known reason wins — one printer storing internally is a real
    finding worth explaining, and it should not be masked by another printer's
    plain missing-file fallback.

    Complements the connection-diagnostic ``external_storage`` check, which
    only catches the printer-side variant of the setting. On older slicers
    where the toggle lives only in BambuStudio, the printer never reports it
    and the diagnostic passes — this endpoint surfaces the symptom instead.

    Dismissal is handled client-side via localStorage (one-shot): once the
    user has been told, no further nudge until they clear browser storage.
    The backend stays stateless.
    """
    user, can_read_all = auth_result
    cutoff = datetime.now(timezone.utc) - timedelta(days=30)
    conditions = [
        PrintArchive.created_at >= cutoff,
        PrintArchive.deleted_at.is_(None),
        PrintArchive.extra_data.isnot(None),
    ]
    if user is not None and not can_read_all:
        conditions.append(PrintArchive.created_by_id == user.id)
    result = await db.execute(select(PrintArchive.extra_data).where(*conditions))
    reasons: set[str] = set()
    has_fallback = False
    for (extra_data,) in result.all():
        if not extra_data or not extra_data.get("no_3mf_available"):
            continue
        has_fallback = True
        reason = extra_data.get("no_3mf_reason")
        if reason:
            reasons.add(reason)
    if not has_fallback:
        return {"has_fallback": False, "reason": None}
    # Most specific first. Archives predating this field carry no reason at
    # all, so an install with one H2C and three older printers still gets the
    # H2C explanation rather than the generic one.
    #
    # REASON_FTPS_COOLOFF leads, and it is the only one of these that reports a
    # fault rather than a choice: the printer's file service refused a TLS
    # handshake, so the sweep never ran and nothing about where the file went
    # was ever tested. The other three describe an install working as
    # configured, and each ends in something the operator can change. This one
    # ends in "your printer is doing something we cannot yet explain", which is
    # both the more urgent thing to say and the thing that produces a useful
    # report. It also has to outrank them because the banner dismisses one-shot
    # into localStorage: a reason ranked below another is not merely deferred,
    # it is never shown to that user again (#2780).
    #
    # Ranking it first cannot mask a permanent cause, because a cool-off row is
    # not permanent. The retry #2957 schedules clears the row's markers when it
    # lands, so a row still carrying this slug is one where the retry failed too
    # -- a printer whose file service is still refusing, days later.
    #
    # REASON_FTP_TRANSFER_FAILED sits second for the same reasons and one more:
    # it is the only slug here whose remedy is a Bambuddy setting rather than a
    # slicer one or a card. It ranks below the cool-off because a printer that
    # will not complete a TLS handshake is the worse fault of the two, and its
    # own retry (#3063) clears the row the same way, so a row still carrying
    # this slug is one where three later attempts also ran out of time.
    #
    # REASON_INTERNAL_HISTORY comes last on purpose, even though it is the
    # narrowest: it is the one cause with no remedy at all -- the file was
    # already on the printer, in an area port 990 does not serve. The two ahead
    # of it each end in something the operator can do, so when an install has
    # both, the actionable explanation is the one worth the banner (#1820).
    for candidate in (
        REASON_FTPS_COOLOFF,
        REASON_FTP_TRANSFER_FAILED,
        REASON_INTERNAL_STORAGE,
        REASON_NO_EXTERNAL_STORAGE,
        REASON_INTERNAL_HISTORY,
    ):
        if candidate in reasons:
            return {"has_fallback": True, "reason": candidate}
    return {"has_fallback": True, "reason": None}


@router.get("/slim", response_model=list[ArchiveSlim])
async def list_archives_slim(
    date_from: date | None = Query(None),
    date_to: date | None = Query(None),
    created_by_id: int | None = Query(None, description="Filter by user who created the print (-1 for no user)"),
    limit: int = Query(default=10000, le=50000),
    offset: int = 0,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Per-event listing for stats/dashboard widgets.

    Reads from print_log_entries so reprints contribute each run and
    orphaned events (archive deleted, log row survived via ON DELETE
    SET NULL) still aggregate consistently with Quick Stats. The sliced
    print_time_seconds is joined from the archive when available; for
    orphan events it is null and downstream widgets fall back to the
    measured duration_seconds.
    """
    from backend.app.models.print_log import PrintLogEntry

    current_user, can_read_all = auth_result
    _validate_user_filter_permission(current_user, created_by_id)
    # Callers without ARCHIVES_READ_ALL can only see their own runs — pin
    # the filter unconditionally so a caller-supplied ?created_by_id=
    # can't widen the listing past their own scope. The existing
    # _validate_user_filter_permission rejects ?created_by_id= without
    # STATS_FILTER_BY_USER, so the only way to reach this is owner-self
    # filtering anyway, but pinning here is the fail-closed default.
    if current_user is not None and not can_read_all:
        created_by_id = current_user.id
    filters = []
    if date_from:
        dt_from = datetime.combine(date_from, time.min, tzinfo=timezone.utc)
        filters.append(PrintLogEntry.created_at >= dt_from)
    if date_to:
        dt_to = datetime.combine(date_to, time.max, tzinfo=timezone.utc)
        filters.append(PrintLogEntry.created_at <= dt_to)
    _apply_run_user_filter(filters, created_by_id)
    if (clause := printer_scope.where(PrintLogEntry.printer_id)) is not None:
        filters.append(clause)

    query = (
        select(
            PrintLogEntry.printer_id,
            PrintLogEntry.print_name,
            PrintArchive.print_time_seconds,
            PrintLogEntry.started_at,
            PrintLogEntry.completed_at,
            PrintLogEntry.duration_seconds,
            PrintLogEntry.filament_used_grams,
            PrintLogEntry.filament_type,
            PrintLogEntry.filament_color,
            PrintLogEntry.status,
            PrintLogEntry.cost,
            PrintLogEntry.energy_kwh,
            PrintLogEntry.energy_cost,
            PrintLogEntry.wear_cost,
            PrintLogEntry.created_at,
        )
        .outerjoin(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
        .where(*filters)
        .order_by(PrintLogEntry.created_at.desc())
        .limit(limit)
        .offset(offset)
    )
    result = await db.execute(query)
    rows = result.all()

    return [
        {
            "printer_id": r.printer_id,
            "print_name": r.print_name,
            "print_time_seconds": r.print_time_seconds,
            "actual_time_seconds": (
                # Measured elapsed time for every status (#1390): failed /
                # cancelled prints still ran for some duration, and Quick
                # Stats already counts that. Widgets that fall back to
                # print_time_seconds (slicer estimate) for non-completed
                # events would diverge from Quick Stats — so expose the
                # measured value here unconditionally.
                #
                # Trust an explicit 0 (reconciled aborts store it deliberately;
                # their real end time is unknown) instead of recomputing the
                # multi-day disconnect gap from the timestamps (#2592).
                r.duration_seconds
                if r.duration_seconds is not None
                else (
                    int((r.completed_at - r.started_at).total_seconds())
                    if r.started_at and r.completed_at and (r.completed_at - r.started_at).total_seconds() > 0
                    else None
                )
            ),
            "filament_used_grams": r.filament_used_grams,
            "filament_type": r.filament_type,
            "filament_color": r.filament_color,
            "status": r.status,
            "started_at": r.started_at,
            "completed_at": r.completed_at,
            "cost": r.cost,
            "energy_kwh": r.energy_kwh,
            "energy_cost": r.energy_cost,
            "wear_cost": r.wear_cost,
            "quantity": 1,
            "created_at": r.created_at,
        }
        for r in rows
    ]


@router.get("/search", response_model=list[ArchiveResponse])
async def search_archives(
    q: str = Query(..., min_length=2, description="Search query"),
    printer_id: int | None = None,
    project_id: int | None = None,
    status: str | None = None,
    limit: int = 50,
    offset: int = 0,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Full-text search across archives.

    Searches print_name, filename, tags, notes, designer, and filament_type fields.
    Supports partial matches with wildcards (e.g., 'vor*' matches 'voron').
    """
    from sqlalchemy import text
    from sqlalchemy.orm import selectinload

    from backend.app.core.db_dialect import is_sqlite

    user, can_read_all = auth_result
    own_only = user is not None and not can_read_all
    search_term = q.strip()

    # Build dialect-specific full-text search query
    if is_sqlite():
        # SQLite FTS5: wildcard suffix for partial matches
        if not search_term.endswith("*"):
            search_term = f"{search_term}*"
        fts_query = text("""
            SELECT rowid FROM archive_fts
            WHERE archive_fts MATCH :search_term
            ORDER BY rank
            LIMIT :limit OFFSET :offset
        """)
    else:
        # PostgreSQL: tsvector + plainto_tsquery with prefix matching
        fts_query = text("""
            SELECT id FROM print_archives
            WHERE to_tsvector('simple',
                COALESCE(print_name, '') || ' ' ||
                COALESCE(filename, '') || ' ' ||
                COALESCE(tags, '') || ' ' ||
                COALESCE(notes, '') || ' ' ||
                COALESCE(designer, '') || ' ' ||
                COALESCE(filament_type, '')
            ) @@ to_tsquery('simple', :search_term)
            LIMIT :limit OFFSET :offset
        """)
        # Convert "benchy" to "benchy:*" for prefix matching in tsquery
        search_term = " & ".join(f"{word}:*" for word in search_term.split() if word)

    try:
        result = await db.execute(fts_query, {"search_term": search_term, "limit": limit + 100, "offset": 0})
        matched_ids = [row[0] for row in result.fetchall()]
    except Exception as e:
        logger.warning("FTS search failed, falling back to LIKE search: %s", e)
        # Fallback to LIKE search if FTS fails
        like_pattern = f"%{q}%"
        query = (
            select(PrintArchive)
            .options(selectinload(PrintArchive.project))
            .where(
                (
                    (PrintArchive.print_name.ilike(like_pattern))
                    | (PrintArchive.filename.ilike(like_pattern))
                    | (PrintArchive.tags.ilike(like_pattern))
                    | (PrintArchive.notes.ilike(like_pattern))
                    | (PrintArchive.designer.ilike(like_pattern))
                    | (PrintArchive.filament_type.ilike(like_pattern))
                ),
                PrintArchive.deleted_at.is_(None),
            )
            .order_by(PrintArchive.created_at.desc())
        )

        if printer_id:
            query = query.where(PrintArchive.printer_id == printer_id)
        if project_id:
            query = query.where(PrintArchive.project_id == project_id)
        if status:
            query = query.where(PrintArchive.status == status)
        if own_only:
            query = query.where(PrintArchive.created_by_id == user.id)
        if (clause := printer_scope.where(PrintArchive.printer_id)) is not None:
            query = query.where(clause)

        query = query.limit(limit).offset(offset)
        result = await db.execute(query)
        archives = result.scalars().all()
        # Load run aggregates so multi-run archives' time/accuracy badge is
        # suppressed consistently with the main list endpoint (#1608).
        run_aggregates = await _load_run_aggregates(db, [a.id for a in archives])
        return [archive_to_response(a, run_aggregate=run_aggregates.get(a.id)) for a in archives]

    if not matched_ids:
        return []

    # Fetch full archive records for matched IDs (excluding soft-deleted, #1343)
    query = (
        select(PrintArchive)
        .options(selectinload(PrintArchive.project))
        .where(PrintArchive.id.in_(matched_ids), PrintArchive.deleted_at.is_(None))
    )
    if own_only:
        query = query.where(PrintArchive.created_by_id == user.id)
    if (clause := printer_scope.where(PrintArchive.printer_id)) is not None:
        query = query.where(clause)

    # Apply additional filters
    if printer_id:
        query = query.where(PrintArchive.printer_id == printer_id)
    if project_id:
        query = query.where(PrintArchive.project_id == project_id)
    if status:
        query = query.where(PrintArchive.status == status)

    result = await db.execute(query)
    archives_dict = {a.id: a for a in result.scalars().all()}

    # Preserve FTS ranking order and apply pagination
    ordered_archives = [archives_dict[id] for id in matched_ids if id in archives_dict]
    paginated = ordered_archives[offset : offset + limit]

    # Load run aggregates so multi-run archives' time/accuracy badge is
    # suppressed consistently with the main list endpoint (#1608).
    run_aggregates = await _load_run_aggregates(db, [a.id for a in paginated])
    return [archive_to_response(a, run_aggregate=run_aggregates.get(a.id)) for a in paginated]


@router.post("/search/rebuild-index")
async def rebuild_search_index(
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
):
    """Rebuild the full-text search index from existing archives.

    Use this if search results seem incomplete or incorrect.
    """
    from sqlalchemy import text

    from backend.app.core.db_dialect import is_sqlite

    try:
        if is_sqlite():
            # SQLite: rebuild FTS5 virtual table
            await db.execute(text("DELETE FROM archive_fts"))
            await db.execute(
                text("""
                INSERT INTO archive_fts(rowid, print_name, filename, tags, notes, designer, filament_type)
                SELECT id, print_name, filename, tags, notes, designer, filament_type
                FROM print_archives
            """)
            )
            await db.commit()

            result = await db.execute(text("SELECT COUNT(*) FROM archive_fts"))
            count = result.scalar() or 0
        else:
            # PostgreSQL: GIN index is auto-maintained, just reindex
            await db.execute(text("REINDEX INDEX idx_archives_fulltext"))
            await db.commit()

            result = await db.execute(text("SELECT COUNT(*) FROM print_archives"))
            count = result.scalar() or 0

        return {"message": f"Search index rebuilt with {count} entries"}
    except Exception as e:
        logger.error("Failed to rebuild search index: %s", e)
        raise HTTPException(status_code=500, detail=f"Failed to rebuild index: {str(e)}")


@router.get("/analysis/failures")
async def analyze_failures(
    days: int | None = None,
    date_from: date | None = Query(None),
    date_to: date | None = Query(None),
    printer_id: int | None = None,
    project_id: int | None = None,
    created_by_id: int | None = Query(None, description="Filter by user who created the print (-1 for no user)"),
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Analyze failure patterns across prints.

    Returns failure statistics including:
    - Overall failure rate
    - Failures by reason, filament type, printer
    - Time of day distribution
    - Recent failures
    - Weekly trend
    """
    current_user, can_read_all = auth_result
    _validate_user_filter_permission(current_user, created_by_id)
    # Callers without ARCHIVES_READ_ALL are scoped to their own runs (#2).
    if current_user is not None and not can_read_all:
        created_by_id = current_user.id

    from backend.app.services.failure_analysis import FailureAnalysisService

    service = FailureAnalysisService(db)
    return await service.analyze_failures(
        days=days,
        date_from=date_from,
        date_to=date_to,
        printer_id=printer_id,
        project_id=project_id,
        created_by_id=created_by_id,
        printer_scope=printer_scope,
    )


@router.get("/compare")
async def compare_archives(
    archive_ids: str = Query(..., description="Comma-separated archive IDs (2-5)"),
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Compare multiple archives side by side.

    Compares print settings, filament usage, and print times.
    Also analyzes correlation between settings and success/failure.

    Args:
        archive_ids: Comma-separated list of 2-5 archive IDs to compare
    """
    from backend.app.services.archive_comparison import ArchiveComparisonService

    user, can_read_all = auth_result

    # Parse and validate archive IDs
    try:
        ids = [int(id.strip()) for id in archive_ids.split(",")]
    except ValueError:
        raise HTTPException(400, "Invalid archive IDs format")

    if len(ids) < 2:
        raise HTTPException(400, "At least 2 archives required for comparison")
    if len(ids) > 5:
        raise HTTPException(400, "Maximum 5 archives can be compared at once")

    # Verify the caller is allowed to see every archive in the comparison —
    # one not-owned id in the list would otherwise leak its full detail block.
    # _ensure_archive_visible raises 404 on the first miss (same 404 the
    # single-archive endpoint would return).
    if user is not None and not can_read_all:
        existing = await db.execute(
            select(PrintArchive.id, PrintArchive.created_by_id, PrintArchive.deleted_at).where(PrintArchive.id.in_(ids))
        )
        owners_by_id = {row.id: row for row in existing.all()}
        for archive_id in ids:
            row = owners_by_id.get(archive_id)
            if row is None or row.deleted_at is not None or row.created_by_id != user.id:
                raise HTTPException(404, "Archive not found")

    # Every compared archive must come from a printer the caller can see (#1727)
    if not printer_scope.is_unrestricted:
        printer_ids = await db.execute(select(PrintArchive.printer_id).where(PrintArchive.id.in_(ids)))
        if not all(printer_scope.allows(pid) for (pid,) in printer_ids.all()):
            raise HTTPException(404, "Archive not found")

    service = ArchiveComparisonService(db)
    try:
        return await service.compare_archives(ids)
    except ValueError as e:
        raise HTTPException(400, str(e))


@router.get("/export")
async def export_archives(
    format: str = Query("csv", description="Export format: csv or xlsx"),
    fields: str | None = Query(None, description="Comma-separated field names"),
    printer_id: int | None = None,
    project_id: int | None = None,
    status: str | None = None,
    date_from: str | None = Query(None, description="Start date (ISO format)"),
    date_to: str | None = Query(None, description="End date (ISO format)"),
    search: str | None = None,
    db: AsyncSession = Depends(get_db),
    printer_scope: PrinterScope = RequestPrinterScope,
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
):
    """Export archives to CSV or Excel format.

    Returns a downloadable file with archive data.
    """
    from datetime import datetime

    from fastapi.responses import StreamingResponse

    from backend.app.services.export import ExportService

    user, can_read_all = auth_result
    visible_to_user_id = user.id if (user is not None and not can_read_all) else None

    if format not in ("csv", "xlsx"):
        raise HTTPException(400, "Format must be 'csv' or 'xlsx'")

    # Parse fields
    field_list = None
    if fields:
        field_list = [f.strip() for f in fields.split(",")]

    # Parse dates
    date_from_dt = None
    date_to_dt = None
    if date_from:
        try:
            date_from_dt = datetime.fromisoformat(date_from)
        except ValueError:
            raise HTTPException(400, "Invalid date_from format")
    if date_to:
        try:
            date_to_dt = datetime.fromisoformat(date_to)
        except ValueError:
            raise HTTPException(400, "Invalid date_to format")

    service = ExportService(db)
    try:
        file_bytes, filename, content_type = await service.export_archives(
            format=format,
            fields=field_list,
            printer_id=printer_id,
            project_id=project_id,
            status=status,
            date_from=date_from_dt,
            date_to=date_to_dt,
            search=search,
            visible_to_user_id=visible_to_user_id,
            printer_scope=printer_scope,
        )
    except ImportError as e:
        raise HTTPException(500, str(e))

    return StreamingResponse(
        io.BytesIO(file_bytes),
        media_type=content_type,
        headers={"Content-Disposition": build_content_disposition(filename)},
    )


@router.get("/stats/export")
async def export_stats(
    format: str = Query("csv", description="Export format: csv or xlsx"),
    days: int = 30,
    printer_id: int | None = None,
    project_id: int | None = None,
    created_by_id: int | None = Query(None, description="Filter by user who created the print (-1 for no user)"),
    db: AsyncSession = Depends(get_db),
    current_user: User | None = RequirePermissionIfAuthEnabled(Permission.STATS_READ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Export statistics summary to CSV or Excel format."""
    _validate_user_filter_permission(current_user, created_by_id)

    from fastapi.responses import StreamingResponse

    from backend.app.services.export import ExportService

    if format not in ("csv", "xlsx"):
        raise HTTPException(400, "Format must be 'csv' or 'xlsx'")

    service = ExportService(db)
    try:
        file_bytes, filename, content_type = await service.export_stats(
            format=format,
            days=days,
            printer_id=printer_id,
            project_id=project_id,
            created_by_id=created_by_id,
            printer_scope=printer_scope,
        )
    except ImportError as e:
        raise HTTPException(500, str(e))

    return StreamingResponse(
        io.BytesIO(file_bytes),
        media_type=content_type,
        headers={"Content-Disposition": build_content_disposition(filename)},
    )


@router.get("/stats", response_model=ArchiveStats)
async def get_archive_stats(
    date_from: date | None = Query(None, description="Start date (inclusive), YYYY-MM-DD"),
    date_to: date | None = Query(None, description="End date (inclusive), YYYY-MM-DD"),
    created_by_id: int | None = Query(None, description="Filter by user who created the print (-1 for no user)"),
    db: AsyncSession = Depends(get_db),
    current_user: User | None = RequirePermissionIfAuthEnabled(Permission.STATS_READ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Get statistics across all archives.

    Stats aggregate over PrintLogEntry (one row per print event), not over
    PrintArchive (one row per file). A reprint contributes a new PrintLogEntry
    so its filament/cost/time/energy add to the totals instead of overwriting
    the source archive's first-run values (#1378).
    """
    from backend.app.models.print_log import PrintLogEntry

    _validate_user_filter_permission(current_user, created_by_id)

    # Build date filter conditions scoped to PrintLogEntry (event-time).
    base_conditions = []
    if date_from:
        dt_from = datetime.combine(date_from, time.min, tzinfo=timezone.utc)
        base_conditions.append(PrintLogEntry.created_at >= dt_from)
    if date_to:
        dt_to = datetime.combine(date_to, time.max, tzinfo=timezone.utc)
        base_conditions.append(PrintLogEntry.created_at <= dt_to)
    _apply_run_user_filter(base_conditions, created_by_id)
    # Only prints on printers the caller may see (#1727)
    if (clause := printer_scope.where(PrintLogEntry.printer_id)) is not None:
        base_conditions.append(clause)

    # Total counts (one row per print event).
    total_result = await db.execute(select(func.count(PrintLogEntry.id)).where(*base_conditions))
    total_prints = total_result.scalar() or 0

    successful_result = await db.execute(
        select(func.count(PrintLogEntry.id)).where(PrintLogEntry.status == "completed", *base_conditions)
    )
    successful_prints = successful_result.scalar() or 0

    failed_result = await db.execute(
        select(func.count(PrintLogEntry.id)).where(PrintLogEntry.status.in_(("failed", "aborted")), *base_conditions)
    )
    failed_prints = failed_result.scalar() or 0

    # User/system-stopped prints — stopped/cancelled/skipped are distinct from
    # quality failures: the user (or the queue) interrupted them, the printer
    # didn't detect a fault. Bucketed separately so the Success Rate gauge
    # divides by completed + failed only (a cancelled print shouldn't drag
    # the gauge down), while still being visible in the breakdown so they
    # don't silently vanish from Total Prints (#1390).
    cancelled_result = await db.execute(
        select(func.count(PrintLogEntry.id)).where(
            PrintLogEntry.status.in_(("stopped", "cancelled", "skipped")), *base_conditions
        )
    )
    cancelled_prints = cancelled_result.scalar() or 0

    # Total elapsed time — PrintLogEntry stores duration_seconds directly so we
    # can sum it server-side. Rows missing duration fall back to the slicer
    # estimate from the archive (joined for that case only).
    time_rows = await db.execute(
        select(
            PrintLogEntry.duration_seconds,
            PrintLogEntry.started_at,
            PrintLogEntry.completed_at,
        ).where(*base_conditions)
    )
    total_seconds = 0
    for duration_seconds, started_at, completed_at in time_rows.all():
        # Trust an explicitly stored duration, INCLUDING 0: a reconciled abort
        # stores 0 on purpose because its real end time is unknown, and the
        # started_at→completed_at fallback would otherwise bank the whole
        # multi-day disconnect gap as print time (#2592). Only rows with a NULL
        # duration (legacy entries that never recorded one) fall back.
        if duration_seconds is not None:
            total_seconds += duration_seconds
        elif started_at and completed_at:
            elapsed = (completed_at - started_at).total_seconds()
            if elapsed > 0:
                total_seconds += int(elapsed)
    total_time = total_seconds / 3600  # Convert to hours

    filament_result = await db.execute(
        select(func.coalesce(func.sum(PrintLogEntry.filament_used_grams), 0)).where(*base_conditions)
    )
    total_filament = filament_result.scalar() or 0

    cost_result = await db.execute(select(func.sum(PrintLogEntry.cost)).where(*base_conditions))
    total_cost = cost_result.scalar() or 0

    wear_result = await db.execute(select(func.sum(PrintLogEntry.wear_cost)).where(*base_conditions))
    total_wear_cost = wear_result.scalar() or 0

    # By filament type (split comma-separated values for multi-material prints)
    filament_type_result = await db.execute(
        select(PrintLogEntry.filament_type).where(PrintLogEntry.filament_type.isnot(None), *base_conditions)
    )
    prints_by_filament: dict[str, int] = {}
    for (filament_types,) in filament_type_result.all():
        for ftype in filament_types.split(","):
            ftype = ftype.strip()
            if ftype:
                prints_by_filament[ftype] = prints_by_filament.get(ftype, 0) + 1

    # By printer
    printer_result = await db.execute(
        select(PrintLogEntry.printer_id, func.count(PrintLogEntry.id))
        .where(*base_conditions)
        .group_by(PrintLogEntry.printer_id)
    )
    prints_by_printer = {str(k): v for k, v in printer_result.all()}

    # Names for printers the client can no longer look up. The breakdowns above
    # key on the id each run recorded, and deleting a printer while keeping its
    # history leaves that id pointing at nothing, so a chart that used to read
    # "Ultron" fell back to "Printer 1" (#2873). Every run also stored the name
    # it printed on, so the last one recorded is what that id was called. The
    # client still prefers a live printer's current name, which keeps a rename
    # showing up straight away.
    last_named_run = (
        select(func.max(PrintLogEntry.id).label("entry_id"))
        .where(
            PrintLogEntry.printer_id.isnot(None),
            PrintLogEntry.printer_name.isnot(None),
            *base_conditions,
        )
        .group_by(PrintLogEntry.printer_id)
        .subquery()
    )
    name_result = await db.execute(
        select(PrintLogEntry.printer_id, PrintLogEntry.printer_name).join(
            last_named_run, PrintLogEntry.id == last_named_run.c.entry_id
        )
    )
    printer_names = {str(printer_id): name for printer_id, name in name_result.all()}

    # Time accuracy — compare each completed run's actual duration to the
    # slicer's estimate on the linked archive. Runs without a linked archive
    # (NULL archive_id) or without an estimate are excluded.
    accuracy_rows = await db.execute(
        select(
            PrintLogEntry.duration_seconds,
            PrintLogEntry.started_at,
            PrintLogEntry.completed_at,
            PrintLogEntry.printer_id,
            PrintArchive.print_time_seconds,
        )
        .join(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
        .where(
            PrintLogEntry.status == "completed",
            PrintArchive.print_time_seconds.isnot(None),
            *base_conditions,
        )
    )
    # Accuracy is meaningful only when the estimate roughly describes the
    # work the run actually performed. Two shapes produce wildly-off ratios
    # that are pure noise:
    #   - multi-plate ``.gcode.3mf`` printed plate-by-plate: each run's
    #     actual is one plate, the archive's estimate is the sum across
    #     plates (post-#1593 parser fix), so the ratio is roughly N×100%
    #     for an N-plate file. Pre-fix this shape was also broken, just
    #     less dramatically — the estimate was plate-1-only so the ratio
    #     was meaningless rather than N×.
    #   - manual interventions / purge waste blowing the actual far past
    #     the estimate.
    # Clamp to the [50%, 200%] band so the printer-level average reflects
    # real slicer-vs-reality drift, not multi-plate accounting or one-off
    # outliers. Single-plate archives — the case the metric is actually
    # designed for — stay fully included.
    _ACCURACY_BAND_LO = 50.0
    _ACCURACY_BAND_HI = 200.0
    average_accuracy = None
    accuracy_by_printer: dict[str, float] = {}
    accuracies: list[float] = []
    printer_accuracies: dict[str, list[float]] = {}
    for duration_seconds, started_at, completed_at, run_printer_id, estimate_seconds in accuracy_rows.all():
        actual_seconds = duration_seconds
        if not actual_seconds and started_at and completed_at:
            elapsed = (completed_at - started_at).total_seconds()
            actual_seconds = int(elapsed) if elapsed > 0 else None
        if not actual_seconds or not estimate_seconds:
            continue
        accuracy = (estimate_seconds / actual_seconds) * 100
        if accuracy < _ACCURACY_BAND_LO or accuracy > _ACCURACY_BAND_HI:
            continue
        accuracies.append(accuracy)
        printer_key = str(run_printer_id) if run_printer_id else "unknown"
        printer_accuracies.setdefault(printer_key, []).append(accuracy)
    if accuracies:
        average_accuracy = round(sum(accuracies) / len(accuracies), 1)
    for printer_key, accs in printer_accuracies.items():
        accuracy_by_printer[printer_key] = round(sum(accs) / len(accs), 1)

    # Energy totals - check which mode to use
    from backend.app.api.routes.settings import get_setting
    from backend.app.services.energy_price import (
        all_time_cost,
        cost_at_average_price,
        snapshot_cost,
        stored_price,
    )

    energy_tracking_mode = await get_setting(db, "energy_tracking_mode") or "total"
    # The last price known. Not read from Home Assistant here: the snapshot
    # loop refreshes it hourly, and it only prices the energy since then.
    energy_cost_per_kwh = await stored_price(db)

    total_energy_kwh: float = 0.0
    total_energy_cost: float = 0.0
    energy_data_warming_up = False

    if energy_tracking_mode == "total" and not date_from and not date_to:
        # All-time total consumption — read live lifetime counters, costed at
        # the price of each hour the snapshots cover (#1251).
        total_energy_kwh = await _sum_live_plug_totals(db)
        total_energy_cost = await all_time_cost(db, total_energy_kwh, energy_cost_per_kwh)
    elif energy_tracking_mode == "total":
        # Total consumption mode with a date filter (#941): use hourly snapshots
        # to compute per-plug (endpoint - baseline) deltas.
        dt_from = datetime.combine(date_from, time.min, tzinfo=timezone.utc) if date_from else None
        dt_to = datetime.combine(date_to, time.max, tzinfo=timezone.utc) if date_to else None
        total_energy_kwh, energy_data_warming_up = await _sum_snapshot_deltas(db, dt_from=dt_from, dt_to=dt_to)
        costed = await snapshot_cost(db, fallback_price=energy_cost_per_kwh, dt_from=dt_from, dt_to=dt_to)
        total_energy_cost = cost_at_average_price(total_energy_kwh, costed.kwh, costed.cost, energy_cost_per_kwh)
    else:
        # Per-print mode: sum the per-run energy column from PrintLogEntry.
        energy_kwh_result = await db.execute(select(func.sum(PrintLogEntry.energy_kwh)).where(*base_conditions))
        total_energy_kwh = energy_kwh_result.scalar() or 0

        energy_cost_result = await db.execute(select(func.sum(PrintLogEntry.energy_cost)).where(*base_conditions))
        total_energy_cost = energy_cost_result.scalar() or 0

    return ArchiveStats(
        total_prints=total_prints,
        successful_prints=successful_prints,
        failed_prints=failed_prints,
        cancelled_prints=cancelled_prints,
        total_print_time_hours=round(total_time, 1),
        total_filament_grams=round(total_filament, 1),
        total_cost=round(total_cost, 2),
        prints_by_filament_type=prints_by_filament,
        prints_by_printer=prints_by_printer,
        printer_names=printer_names,
        average_time_accuracy=average_accuracy,
        time_accuracy_by_printer=accuracy_by_printer if accuracy_by_printer else None,
        total_energy_kwh=round(total_energy_kwh, 3),
        total_energy_cost=round(total_energy_cost, 3),
        total_wear_cost=round(total_wear_cost, 2),
        energy_data_warming_up=energy_data_warming_up,
    )


async def _sum_live_plug_totals(db: AsyncSession) -> float:
    """Sum the live lifetime counter from every smart plug.

    Used for all-time "total consumption" mode. Only the current value is
    available so this can't be date-filtered — use `_sum_snapshot_deltas` for
    that case.
    """
    from backend.app.api.routes.settings import get_setting
    from backend.app.models.smart_plug import SmartPlug
    from backend.app.services.homeassistant import homeassistant_service
    from backend.app.services.mqtt_relay import mqtt_relay
    from backend.app.services.rest_smart_plug import rest_smart_plug_service
    from backend.app.services.tasmota import tasmota_service

    plugs_result = await db.execute(select(SmartPlug))
    plugs = list(plugs_result.scalars().all())

    ha_url = await get_setting(db, "ha_url") or ""
    ha_token = await get_setting(db, "ha_token") or ""
    homeassistant_service.configure(ha_url, ha_token)

    total = 0.0
    for plug in plugs:
        if plug.plug_type == "tasmota":
            energy = await tasmota_service.get_energy(plug)
            if energy and energy.get("total") is not None:
                total += energy["total"]
        elif plug.plug_type == "homeassistant":
            energy = await homeassistant_service.get_energy(plug)
            if energy and energy.get("total") is not None:
                total += energy["total"]
        elif plug.plug_type == "mqtt":
            # MQTT plugs only expose today's counter, not lifetime.
            mqtt_data = mqtt_relay.smart_plug_service.get_plug_data(plug.id)
            if mqtt_data and mqtt_data.energy is not None:
                total += mqtt_data.energy
        elif plug.plug_type == "rest":
            # A REST device that exposes only a lifetime counter (Shelly
            # ``aenergy.total`` via ``rest_energy_total_path``) returns no
            # ``today`` key, so read the lifetime total first, like the
            # Tasmota/HA branches above. ``today`` stays as the fallback for
            # devices that only have a daily counter.
            energy = await rest_smart_plug_service.get_energy(plug)
            if energy:
                value = energy.get("total")
                if value is None:
                    value = energy.get("today")
                if value is not None:
                    total += value
    return total


async def _sum_snapshot_deltas(
    db: AsyncSession,
    *,
    dt_from: datetime | None,
    dt_to: datetime | None,
) -> tuple[float, bool]:
    """Sum per-plug energy consumption over a date range using hourly snapshots.

    For each plug:
      * baseline  = last snapshot at or before `dt_from` (ideal)
                    — if missing, fall back to the earliest snapshot ever
                      recorded for the plug and flag the result as warming up.
      * endpoint  = last snapshot at or before `dt_to` (or most recent overall)
      * delta     = max(0, endpoint - baseline)  — clamp counter resets to 0.

    Returns (total_kwh, warming_up). `warming_up = True` means at least one plug
    had no baseline before `dt_from` (fresh install or fresh upgrade), so the
    result undercounts the beginning of the range.
    """
    from backend.app.models.smart_plug import SmartPlug
    from backend.app.models.smart_plug_energy_snapshot import SmartPlugEnergySnapshot
    from backend.app.utils.local_time import to_naive_utc

    # ``recorded_at`` is a naive column holding UTC. Binding an aware datetime
    # against it raises DataError on asyncpg (SQLite silently drops the offset),
    # which took the whole date-filtered energy figure down on Postgres.
    dt_from = to_naive_utc(dt_from)
    dt_to = to_naive_utc(dt_to)

    plug_ids_result = await db.execute(select(SmartPlug.id))
    plug_ids = [row[0] for row in plug_ids_result.all()]
    if not plug_ids:
        return 0.0, False

    total = 0.0
    warming_up = False
    for plug_id in plug_ids:
        baseline: float | None = None
        if dt_from is not None:
            baseline_q = await db.execute(
                select(SmartPlugEnergySnapshot.lifetime_kwh)
                .where(
                    SmartPlugEnergySnapshot.plug_id == plug_id,
                    SmartPlugEnergySnapshot.recorded_at <= dt_from,
                )
                .order_by(SmartPlugEnergySnapshot.recorded_at.desc())
                .limit(1)
            )
            baseline = baseline_q.scalar()
        if baseline is None:
            # No snapshot before range start — fall back to the earliest
            # snapshot ever recorded. Result undercounts the pre-first-snapshot
            # portion of the range; signal that to the frontend.
            earliest_q = await db.execute(
                select(SmartPlugEnergySnapshot.lifetime_kwh)
                .where(SmartPlugEnergySnapshot.plug_id == plug_id)
                .order_by(SmartPlugEnergySnapshot.recorded_at.asc())
                .limit(1)
            )
            baseline = earliest_q.scalar()
            if baseline is None:
                # No snapshots at all for this plug yet.
                warming_up = True
                continue
            warming_up = True

        endpoint_conditions = [SmartPlugEnergySnapshot.plug_id == plug_id]
        if dt_to is not None:
            endpoint_conditions.append(SmartPlugEnergySnapshot.recorded_at <= dt_to)
        endpoint_q = await db.execute(
            select(SmartPlugEnergySnapshot.lifetime_kwh)
            .where(*endpoint_conditions)
            .order_by(SmartPlugEnergySnapshot.recorded_at.desc())
            .limit(1)
        )
        endpoint = endpoint_q.scalar()
        if endpoint is None:
            continue

        total += max(0.0, endpoint - baseline)

    return total, warming_up


@router.get("/tags")
async def get_all_tags(
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
):
    """List all unique tags with usage counts.

    Returns a list of tags sorted by count (descending), then by name.
    """
    user, can_read_all = auth_result
    # Query all archives with non-null tags
    tag_conditions = [PrintArchive.tags.isnot(None), PrintArchive.deleted_at.is_(None)]
    if user is not None and not can_read_all:
        tag_conditions.append(PrintArchive.created_by_id == user.id)
    result = await db.execute(select(PrintArchive.tags).where(*tag_conditions))
    all_tags_rows = result.all()

    # Count occurrences of each tag
    tag_counts: dict[str, int] = {}
    for (tags_str,) in all_tags_rows:
        if tags_str:
            for tag in tags_str.split(","):
                tag = tag.strip()
                if tag:
                    tag_counts[tag] = tag_counts.get(tag, 0) + 1

    # Convert to list and sort by count (desc), then name (asc)
    tags_list = [{"name": name, "count": count} for name, count in tag_counts.items()]
    tags_list.sort(key=lambda x: (-x["count"], x["name"].lower()))

    return tags_list


@router.put("/tags/{tag_name}")
async def rename_tag(
    tag_name: str,
    request: Request,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
):
    """Rename a tag across all archives.

    Request body should contain {"new_name": "new tag name"}.
    Returns the count of affected archives.
    """
    body = await request.json()
    new_name = body.get("new_name", "").strip()

    if not new_name:
        raise HTTPException(400, "new_name is required")

    if new_name == tag_name:
        return {"affected": 0}

    # Find all archives containing the old tag
    result = await db.execute(
        select(PrintArchive).where(PrintArchive.tags.isnot(None), PrintArchive.deleted_at.is_(None))
    )
    archives = list(result.scalars().all())

    affected = 0
    for archive in archives:
        if not archive.tags:
            continue
        tags = [t.strip() for t in archive.tags.split(",")]
        if tag_name in tags:
            # Replace old tag with new tag
            new_tags = [new_name if t == tag_name else t for t in tags]
            # Remove duplicates while preserving order
            seen = set()
            unique_tags = []
            for t in new_tags:
                if t not in seen:
                    seen.add(t)
                    unique_tags.append(t)
            archive.tags = ", ".join(unique_tags)
            affected += 1

    await db.commit()
    return {"affected": affected}


@router.delete("/tags/{tag_name}")
async def delete_tag(
    tag_name: str,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
):
    """Delete a tag from all archives.

    Returns the count of affected archives.
    """
    # Find all archives containing the tag
    result = await db.execute(
        select(PrintArchive).where(PrintArchive.tags.isnot(None), PrintArchive.deleted_at.is_(None))
    )
    archives = list(result.scalars().all())

    affected = 0
    for archive in archives:
        if not archive.tags:
            continue
        tags = [t.strip() for t in archive.tags.split(",")]
        if tag_name in tags:
            # Remove the tag
            new_tags = [t for t in tags if t != tag_name]
            archive.tags = ", ".join(new_tags) if new_tags else None
            affected += 1

    await db.commit()
    return {"affected": affected}


@router.get("/{archive_id}", response_model=ArchiveResponse)
async def get_archive(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get a specific archive."""
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    # Find duplicates
    makerworld_id = archive.extra_data.get("makerworld_model_id") if archive.extra_data else None
    duplicates = await service.find_duplicates(
        archive_id=archive.id,
        content_hash=archive.content_hash,
        print_name=archive.print_name,
        makerworld_model_id=makerworld_id,
    )
    run_aggregates = await _load_run_aggregates(db, [archive.id])
    return archive_to_response(archive, duplicates, run_aggregate=run_aggregates.get(archive.id))


@router.get("/{archive_id}/delete-impact")
async def get_archive_delete_impact(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Pre-flight for the delete-confirm modal (#1734).

    Returns the number of related queue items the user is about to remove
    AND whether any of them are currently printing (which would block the
    delete with a 409 — surfaced to the modal so it can disable the
    confirm button instead of failing on submit). Cheap, single endpoint —
    not folded into the archive GET response so the much larger list
    endpoint isn't forced to run the same query per row.
    """
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)
    from backend.app.services.archive import _count_related_queue_items

    total, printing = await _count_related_queue_items(db, archive.id)
    return {"related_queue_items": total, "currently_printing": printing}


@router.get("/{archive_id}/runs", response_model=PrintLogResponse)
async def list_archive_runs(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """List PrintLogEntry rows for this archive — one per print event.

    Newest first. Drives the per-archive "Print Log" view (#1378).
    """
    from backend.app.models.print_log import PrintLogEntry
    from backend.app.schemas.print_log import PrintLogEntrySchema

    user, can_read_all = auth_result
    _ensure_archive_visible(await db.get(PrintArchive, archive_id), user, can_read_all, printer_scope)

    rows = await db.execute(
        select(PrintLogEntry)
        .where(PrintLogEntry.archive_id == archive_id)
        .order_by(PrintLogEntry.started_at.desc().nulls_last(), PrintLogEntry.id.desc())
    )
    entries = list(rows.scalars().all())
    items = [PrintLogEntrySchema.model_validate(e, from_attributes=True) for e in entries]
    return PrintLogResponse(items=items, total=len(items))


@router.get("/{archive_id}/similar")
async def find_similar_archives(
    archive_id: int,
    limit: int = 10,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Find archives with similar settings for comparison.

    Returns archives that match by:
    - Same print name (highest priority)
    - Same file content hash
    - Same filament type
    """
    from backend.app.services.archive_comparison import ArchiveComparisonService

    user, can_read_all = auth_result
    _ensure_archive_visible(await db.get(PrintArchive, archive_id), user, can_read_all, printer_scope)

    service = ArchiveComparisonService(db)
    try:
        return await service.find_similar_archives(archive_id, limit=limit)
    except ValueError as e:
        raise HTTPException(404, str(e))


@router.patch("/{archive_id}", response_model=ArchiveResponse)
async def update_archive(
    archive_id: int,
    update_data: ArchiveUpdate,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_UPDATE_ALL,
            Permission.ARCHIVES_UPDATE_OWN,
        )
    ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Update archive metadata (tags, notes, cost, filament grams, is_favorite, project_id)."""
    from sqlalchemy.orm import selectinload

    user, can_modify_all = auth_result

    result = await db.execute(
        select(PrintArchive)
        .options(selectinload(PrintArchive.project), selectinload(PrintArchive.created_by))
        .where(PrintArchive.id == archive_id)
    )
    archive = result.scalar_one_or_none()
    if not archive or not printer_scope.allows(archive.printer_id):
        raise HTTPException(404, "Archive not found")

    # Ownership check
    if not can_modify_all:
        if archive.created_by_id != user.id:
            raise HTTPException(403, "You can only update your own archives")

    # Read before the writes below: the mirror needs to know whether the run's
    # figure was inherited from this archive or measured on its own (#1820).
    previous_filament_grams = archive.filament_used_grams

    update_payload = update_data.model_dump(exclude_unset=True)
    # #1898: how the verdict arrived is recorded with it, never on its own.
    verdict_source = update_payload.pop("user_verdict_source", None)
    for field, value in update_payload.items():
        setattr(archive, field, value)

    # #1898: a landed verdict retires the one-tap capability token from the
    # push notification — the links stop changing anything once someone
    # decided, and report the recorded verdict instead. Clearing the verdict
    # drops the provenance but leaves the token spent: it was used.
    if "user_verdict" in update_payload:
        if update_payload["user_verdict"] is None:
            archive.user_verdict_source = None
            archive.user_verdict_at = None
        else:
            stamp_verdict(archive, verdict_source or "api")
            retire_confirm_token(archive)

    # #1444: Mirror per-run classification fields to the most recent
    # PrintLogEntry for this archive. PrintLogEntry.failure_reason is captured
    # once at print-completion time from archive.failure_reason — which is
    # NULL until the user classifies the failure via the Edit Archive modal.
    # Without this mirror the Failure Analysis widget (which groups by
    # print_log_entries.failure_reason) keeps showing "Unknown" forever.
    # Same desync hits status: flipping it in the modal wouldn't update the
    # entry either. Only the latest entry is touched because that's the run
    # the modal is implicitly showing (archive.failure_reason / status are
    # overwritten on each reprint to reflect the latest run's outcome).
    # filament_used_grams rides along for the same reason (#1820): the filament
    # totals on the Projects page and in the Prometheus metrics sum the LOG
    # ENTRY's grams, not the archive's, so correcting only the archive would fix
    # the card and leave every aggregate reading the old figure -- or, for a
    # print that archived without its 3MF, no figure at all.
    mirror_fields = {"failure_reason", "status", "filament_used_grams", "user_verdict"}
    to_mirror = {k: v for k, v in update_payload.items() if k in mirror_fields}
    if to_mirror:
        from backend.app.models.print_log import PrintLogEntry

        latest_entry = await db.scalar(
            select(PrintLogEntry)
            .where(PrintLogEntry.archive_id == archive_id)
            .order_by(PrintLogEntry.id.desc())
            .limit(1)
        )
        if latest_entry is not None:
            # ...but never over a figure the run measured for itself. A run's
            # grams come from the tracked spool delta when there is one, and
            # only fall back to copying the archive's estimate when there is
            # not (see _compute_run_filament_grams). Overwriting a measurement
            # with a typed estimate would lose the better number; the case this
            # edit exists for -- a print archived with no 3MF -- leaves the run
            # with nothing at all, so it is covered by the None arm.
            if "filament_used_grams" in to_mirror and not (
                latest_entry.filament_used_grams is None or latest_entry.filament_used_grams == previous_filament_grams
            ):
                del to_mirror["filament_used_grams"]

            for field, value in to_mirror.items():
                setattr(latest_entry, field, value)

    await db.commit()

    # Re-fetch with relationships loaded after commit
    result = await db.execute(
        select(PrintArchive)
        .options(selectinload(PrintArchive.project), selectinload(PrintArchive.created_by))
        .where(PrintArchive.id == archive_id)
    )
    archive = result.scalar_one_or_none()

    # Load run aggregate so the time/accuracy badge stays consistent with
    # the list / detail endpoints when the frontend re-renders the card
    # after a PATCH (#1608).
    run_aggregates = await _load_run_aggregates(db, [archive.id]) if archive else {}
    return archive_to_response(archive, run_aggregate=run_aggregates.get(archive.id) if archive else None)


@router.post("/{archive_id}/favorite", response_model=ArchiveResponse)
async def toggle_favorite(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_UPDATE_ALL,
            Permission.ARCHIVES_UPDATE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Toggle favorite status for an archive."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    archive.is_favorite = not archive.is_favorite
    await db.commit()
    await db.refresh(archive)
    return archive


async def _spoolman_owns_cost(db: AsyncSession) -> bool:
    """True when per-spool pricing lives in Spoolman rather than in our tables.

    Both cost recalculations below rebuild a print's cost from
    ``SpoolUsageHistory``, and fall back to the built-in Filament catalogue or
    the global default rate when there are no rows for it. In Spoolman mode
    there are never any rows -- the built-in usage tracker is handed
    ``spoolman_owns_usage`` at print start and writes none -- so that fallback
    is not a recalculation, it is a downgrade: it would overwrite the
    Spoolman-priced figure ``spoolman_tracking`` recorded at completion with a
    default-rate one, and the per-slot spool resolution it came from is
    transient and cannot be rebuilt here (#2591).
    """
    from backend.app.api.routes.settings import get_setting

    setting = await get_setting(db, "spoolman_enabled")
    return bool(setting) and setting.lower() == "true"


@router.post("/{archive_id}/rescan", response_model=ArchiveResponse)
async def rescan_archive(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Rescan the 3MF file and update metadata."""
    from backend.app.api.routes.settings import get_setting
    from backend.app.services.archive import ThreeMFParser

    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = result.scalar_one_or_none()
    if not archive or not printer_scope.allows(archive.printer_id):
        raise HTTPException(404, "Archive not found")

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "Archive file not found")

    # Parse the 3MF file
    parser = ThreeMFParser(file_path)
    metadata = parser.parse()

    # Update fields from metadata
    if metadata.get("filament_type"):
        archive.filament_type = metadata["filament_type"]
    if metadata.get("filament_color"):
        archive.filament_color = metadata["filament_color"]
    if metadata.get("print_time_seconds"):
        archive.print_time_seconds = metadata["print_time_seconds"]
    if metadata.get("filament_used_grams"):
        archive.filament_used_grams = metadata["filament_used_grams"]
    if metadata.get("layer_height"):
        archive.layer_height = metadata["layer_height"]
    if metadata.get("nozzle_diameter"):
        archive.nozzle_diameter = metadata["nozzle_diameter"]
    if metadata.get("bed_temperature"):
        archive.bed_temperature = metadata["bed_temperature"]
    if metadata.get("bed_type"):
        archive.bed_type = metadata["bed_type"]
    if metadata.get("nozzle_temperature"):
        archive.nozzle_temperature = metadata["nozzle_temperature"]
    if metadata.get("makerworld_url"):
        archive.makerworld_url = metadata["makerworld_url"]
    if metadata.get("designer"):
        archive.designer = metadata["designer"]

    # Calculate cost: prefer spool-based cost if available, else catalog-based.
    # When spool-based costs exist but don't cover every filament gram used
    # (#1344), fall back to the global default rate for the untracked weight
    # so the displayed cost still reflects the whole print.

    if archive.filament_used_grams and archive.filament_type:
        default_cost_setting = await get_setting(db, "default_filament_cost")
        default_cost_per_kg = float(default_cost_setting) if default_cost_setting else 25.0
        usage_result = await db.execute(
            select(
                func.sum(SpoolUsageHistory.cost),
                func.sum(SpoolUsageHistory.weight_used),
            ).where(SpoolUsageHistory.archive_id == archive.id)
        )
        usage_cost_row = usage_result.one()
        usage_cost = usage_cost_row[0]
        tracked_grams = float(usage_cost_row[1] or 0)
        if usage_cost is not None and usage_cost > 0:
            total_cost = float(usage_cost)
            untracked_grams = max(0.0, archive.filament_used_grams - tracked_grams)
            if untracked_grams > 0 and default_cost_per_kg > 0:
                total_cost += (untracked_grams / 1000.0) * default_cost_per_kg
            archive.cost = float(Decimal(str(total_cost)).quantize(Decimal("0.01"), rounding=ROUND_HALF_UP))
        elif await _spoolman_owns_cost(db) and archive.cost is not None:
            # Keep what completion priced from the linked spools. A rescan
            # re-reads the 3MF's metadata; it learns nothing about spools.
            pass
        else:
            primary_type = archive.filament_type.split(",")[0].strip()
            filament_result = await db.execute(select(Filament).where(Filament.type == primary_type).limit(1))
            filament = filament_result.scalar_one_or_none()
            if filament:
                archive.cost = float(
                    Decimal(str((archive.filament_used_grams / 1000) * filament.cost_per_kg)).quantize(
                        Decimal("0.01"), rounding=ROUND_HALF_UP
                    )
                )
            else:
                archive.cost = float(
                    Decimal(str((archive.filament_used_grams / 1000) * default_cost_per_kg)).quantize(
                        Decimal("0.01"), rounding=ROUND_HALF_UP
                    )
                )

    await db.commit()
    await db.refresh(archive)
    return archive


@router.post("/recalculate-costs")
async def recalculate_all_costs(
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
):
    """Recalculate costs for all archives based on filament usage and prices."""

    from backend.app.api.routes.settings import get_setting

    result = await db.execute(select(PrintArchive))
    archives = list(result.scalars().all())

    # Load all filaments for lookup
    filament_result = await db.execute(select(Filament))
    filaments = {f.type: f.cost_per_kg for f in filament_result.scalars().all()}

    # Get default filament cost from settings
    default_cost_setting = await get_setting(db, "default_filament_cost")
    default_cost_per_kg = float(default_cost_setting) if default_cost_setting else 25.0

    # Pre-fetch all usage costs and tracked weight by archive_id.
    # Tracked weight is used to top-up the cost at the default rate for any
    # filament grams not covered by an inventory spool (#1344).
    usage_costs_result = await db.execute(
        select(
            SpoolUsageHistory.archive_id,
            func.sum(SpoolUsageHistory.cost),
            func.sum(SpoolUsageHistory.weight_used),
        ).group_by(SpoolUsageHistory.archive_id)
    )
    usage_costs = usage_costs_result.fetchall()
    cost_map = {
        row[0]: (row[1], float(row[2] or 0))
        for row in usage_costs
        if row[0] is not None and row[1] is not None and row[1] > 0
    }

    spoolman_owns = await _spoolman_owns_cost(db)

    updated = 0
    preserved = 0
    for archive in archives:
        usage = cost_map.get(archive.id)
        if usage is not None:
            usage_cost, tracked_grams = usage
            total_cost = float(usage_cost)
            archive_grams = float(archive.filament_used_grams or 0)
            untracked_grams = max(0.0, archive_grams - tracked_grams)
            if untracked_grams > 0 and default_cost_per_kg > 0:
                total_cost += (untracked_grams / 1000.0) * default_cost_per_kg
            new_cost = round(total_cost, 2)
        else:
            # Fallback: sum costs for old records by print_name
            usage_result = await db.execute(
                select(func.sum(SpoolUsageHistory.cost)).where(
                    SpoolUsageHistory.print_name == archive.print_name,
                    SpoolUsageHistory.archive_id.is_(None),
                )
            )
            fallback_cost = usage_result.scalar()
            if fallback_cost is not None and fallback_cost > 0:
                new_cost = round(fallback_cost, 2)
            elif spoolman_owns and archive.cost is not None:
                # Priced from the linked Spoolman spools at completion; there is
                # nothing better to recompute it from here (#2591).
                new_cost = None
                preserved += 1
            elif archive.filament_used_grams and archive.filament_type:
                primary_type = archive.filament_type.split(",")[0].strip()
                cost_per_kg = filaments.get(primary_type, default_cost_per_kg)
                new_cost = round((archive.filament_used_grams / 1000) * cost_per_kg, 2)
            else:
                new_cost = None
        if new_cost is not None and archive.cost != new_cost:
            archive.cost = new_cost
            updated += 1

    await db.commit()
    message = f"Recalculated costs for {updated} archives"
    if preserved:
        message += f"; kept {preserved} priced from Spoolman"
    return {"message": message, "updated": updated, "preserved": preserved}


@router.post("/rescan-all")
async def rescan_all_archives(
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
):
    """Rescan all archives and update their metadata."""
    from backend.app.services.archive import ThreeMFParser

    result = await db.execute(select(PrintArchive))
    archives = list(result.scalars().all())

    updated = 0
    errors = []

    for archive in archives:
        try:
            file_path = settings.base_dir / archive.file_path
            if not file_path.is_file():
                errors.append({"id": archive.id, "error": "File not found"})
                continue

            parser = ThreeMFParser(file_path)
            metadata = parser.parse()

            if metadata.get("filament_type"):
                archive.filament_type = metadata["filament_type"]
            if metadata.get("filament_color"):
                archive.filament_color = metadata["filament_color"]
            if metadata.get("print_time_seconds"):
                archive.print_time_seconds = metadata["print_time_seconds"]
            if metadata.get("filament_used_grams"):
                archive.filament_used_grams = metadata["filament_used_grams"]
            if metadata.get("layer_height"):
                archive.layer_height = metadata["layer_height"]
            if metadata.get("nozzle_diameter"):
                archive.nozzle_diameter = metadata["nozzle_diameter"]
            if metadata.get("makerworld_url"):
                archive.makerworld_url = metadata["makerworld_url"]
            if metadata.get("designer"):
                archive.designer = metadata["designer"]

            updated += 1
        except Exception as e:
            logger.exception("Failed to rescan archive %s: %s", archive.id, e)
            errors.append({"id": archive.id, "error": "Failed to parse 3MF file"})

    await db.commit()
    return {"updated": updated, "errors": errors}


@router.get("/{archive_id}/duplicates")
async def get_archive_duplicates(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get duplicates for a specific archive."""
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    makerworld_id = archive.extra_data.get("makerworld_model_id") if archive.extra_data else None
    duplicates = await service.find_duplicates(
        archive_id=archive.id,
        content_hash=archive.content_hash,
        print_name=archive.print_name,
        makerworld_model_id=makerworld_id,
    )
    return {"duplicates": duplicates, "count": len(duplicates)}


@router.post("/backfill-hashes")
async def backfill_content_hashes(
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
):
    """Compute and store content hashes for all archives missing them."""
    result = await db.execute(select(PrintArchive).where(PrintArchive.content_hash.is_(None)))
    archives = list(result.scalars().all())

    updated = 0
    errors = []

    for archive in archives:
        try:
            file_path = settings.base_dir / archive.file_path
            if not file_path.is_file():
                errors.append({"id": archive.id, "error": "File not found"})
                continue

            archive.content_hash = ArchiveService.compute_file_hash(file_path)
            updated += 1
        except Exception as e:
            logger.exception("Failed to compute hash for archive %s: %s", archive.id, e)
            errors.append({"id": archive.id, "error": "Failed to compute hash"})

    await db.commit()
    return {"updated": updated, "errors": errors}


@router.delete("/{archive_id}")
async def delete_archive(
    archive_id: int,
    purge_stats: bool = Query(
        False,
        description=(
            "When false (default) the archive is soft-deleted — files removed "
            "from disk, row hidden from listings, but its filament / energy / "
            "time / cost contribution stays in Quick Stats. Set true to also "
            "drop the row from statistics (#1343)."
        ),
    ),
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_DELETE_ALL,
            Permission.ARCHIVES_DELETE_OWN,
        )
    ),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Delete an archive (soft by default; ``?purge_stats=true`` to hard-delete).

    Both delete paths now cascade to related ``print_queue`` rows (#1734) —
    hard delete via the ``ON DELETE CASCADE`` FK, soft delete via the
    ``_delete_related_queue_items`` helper. A 409 guard blocks the delete
    when any related queue item is currently mid-print so the dispatcher
    doesn't lose its metadata trail under the running print.
    """
    user, can_modify_all = auth_result

    # Get archive first to check ownership
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = result.scalar_one_or_none()
    if not archive or not printer_scope.allows(archive.printer_id):
        raise HTTPException(404, "Archive not found")

    # Ownership check
    if not can_modify_all:
        if archive.created_by_id != user.id:
            raise HTTPException(403, "You can only delete your own archives")

    # #1734: block delete when any related queue item is currently printing.
    # Both soft and hard delete are gated — an in-flight print needs its
    # backing archive to stay around for the metadata trail (filament,
    # plate, ams_mapping). The user can stop the print first, then retry.
    from backend.app.services.archive import _count_related_queue_items

    _related_total, related_printing = await _count_related_queue_items(db, archive_id)
    if related_printing > 0:
        raise HTTPException(
            409,
            f"Cannot delete archive — {related_printing} related queue item(s) are "
            f"currently printing. Stop the print first, then retry.",
        )

    service = ArchiveService(db)
    if purge_stats:
        # Hard-delete the linked PrintLogEntry rows first so their filament /
        # cost / count contributions disappear from /archives/stats. The FK is
        # ON DELETE SET NULL, so without this delete the runs would survive
        # the archive row and keep showing up in totals (#1343 / #1378).
        from sqlalchemy import delete as sa_delete

        from backend.app.models.print_log import PrintLogEntry

        await db.execute(sa_delete(PrintLogEntry).where(PrintLogEntry.archive_id == archive_id))
        await db.commit()

        if not await service.delete_archive(archive_id):
            raise HTTPException(404, "Archive not found")
        return {"status": "deleted", "purged_from_stats": True}

    if not await service.soft_delete_archive(archive_id):
        raise HTTPException(404, "Archive not found")
    return {"status": "deleted", "purged_from_stats": False}


@router.get("/{archive_id}/download")
async def download_archive(
    archive_id: int,
    inline: bool = False,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Download the 3MF file."""
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "File not found")

    # Use inline disposition to let browser/OS handle file association
    content_disposition = "inline" if inline else "attachment"

    return FileResponse(
        path=file_path,
        filename=archive.filename,
        media_type="application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
        content_disposition_type=content_disposition,
    )


@router.get("/{archive_id}/file/{filename}")
async def download_archive_with_filename(
    archive_id: int,
    filename: str,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Download the 3MF file with filename in URL."""
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "File not found")

    return FileResponse(
        path=file_path,
        filename=archive.filename,
        media_type="application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
    )


@router.post("/{archive_id}/slicer-token")
async def create_archive_slicer_token(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Create a short-lived download token for opening files in slicer applications.

    Slicer protocol handlers (bambustudioopen://, orcaslicer://) cannot send
    auth headers, so they use this token in the URL path instead.
    """
    from backend.app.core.auth import create_slicer_download_token

    user, can_read_all = auth_result
    service = ArchiveService(db)
    _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    token = await create_slicer_download_token("archive", archive_id)
    return {"token": token}


@router.get("/{archive_id}/dl/{token}/{filename}")
async def download_archive_for_slicer(
    archive_id: int,
    token: str,
    filename: str,
    db: AsyncSession = Depends(get_db),
):
    """Download 3MF file using a slicer download token.

    Token-authenticated (no auth headers needed). The token is short-lived and
    archive-bound, created by POST /{archive_id}/slicer-token, and redeemable
    for the rest of its TTL rather than exactly once -- the slicer is a separate
    process that may fetch the URL more than once (#3029).
    Filename is at the end of the URL so slicers can detect the file format.
    """
    from backend.app.core.auth import verify_slicer_download_token

    if not await verify_slicer_download_token(token, "archive", archive_id, single_use=False):
        raise HTTPException(403, "Invalid or expired download token")

    service = ArchiveService(db)
    archive = await service.get_archive(archive_id)
    if not archive:
        raise HTTPException(404, "Archive not found")

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "File not found")

    return FileResponse(
        path=file_path,
        filename=archive.filename,
        media_type="application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
    )


@router.get("/{archive_id}/thumbnail")
async def get_thumbnail(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_media_token_ownership(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get the thumbnail image.

    Requires a media token query param (?token=xxx) when auth is enabled, and
    returns 404 for an archive the caller may not read (#3025).
    """
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)
    if not archive.thumbnail_path:
        raise HTTPException(404, "Thumbnail not found")

    thumb_path = settings.base_dir / archive.thumbnail_path
    if not thumb_path.exists():
        raise HTTPException(404, "Thumbnail file not found")

    # Use file modification time as ETag to bust cache
    mtime = int(thumb_path.stat().st_mtime)

    return FileResponse(
        path=thumb_path,
        media_type="image/png",
        headers={
            "Cache-Control": "no-cache, must-revalidate",
            "ETag": f'"{mtime}"',
        },
    )


@router.get("/{archive_id}/printer-media")
async def get_archive_printer_media(
    archive_id: int,
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    can_list_printer_files: bool = Depends(probe_permissions_if_auth_enabled(Permission.PRINTERS_FILES)),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Find downloadable timelapse and `/ipcam` files for one print.

    Local attached timelapses are returned without touching the printer.
    Printer directories are listed only when the caller also has
    ``printers:files``; otherwise the local result is returned with a warning.
    Files are downloaded only after the user explicitly selects them in the UI.
    """

    user, can_read_all = auth_result
    async with database.async_session() as db:
        archive = _ensure_archive_visible(
            await ArchiveService(db).get_archive(archive_id), user, can_read_all, printer_scope
        )
        printer = None
        claimed_timelapse_stems: set[str] = set()
        if archive.printer_id is not None:
            printer = (await db.execute(select(Printer).where(Printer.id == archive.printer_id))).scalar_one_or_none()
            if printer is not None and archive.timelapse_path is None:
                claimed_timelapse_stems = await _claimed_timelapse_stems(db, archive.printer_id, archive_id)

    local_timelapse = None
    if archive.timelapse_path:
        local_path = settings.base_dir / archive.timelapse_path
        if await asyncio.to_thread(local_path.is_file):
            local_timelapse = {
                "name": local_path.name,
                "size": (await asyncio.to_thread(local_path.stat)).st_size,
            }

    response = {
        "archive_id": archive.id,
        "printer_id": archive.printer_id,
        "local_timelapse": local_timelapse,
        "remote_files": [],
        "warnings": [],
    }
    if archive.printer_id is None or archive.started_at is None:
        return response
    if not can_list_printer_files:
        response["warnings"].append("printer_files_forbidden")
        return response

    if printer is None or not printer_scope.allows(printer.id):
        response["warnings"].append("printer_missing")
        return response

    if ftps_handshake_blocked(printer.ip_address):
        if local_timelapse is None:
            response["warnings"].append("timelapse_unavailable")
        response["warnings"].append("ipcam_unavailable")
        return response

    remote_files: list[dict] = []

    # If no copy was attached to the archive, offer the matching printer-side
    # timelapse without mutating the archive or deleting anything from the SD.
    if local_timelapse is None:
        videos: list[dict] = []
        any_timelapse_directory_available = False
        for timelapse_dir in ("/timelapse", "/timelapse/video", "/record", "/recording"):
            if ftps_handshake_blocked(printer.ip_address):
                break
            listing = await list_files_result_async(
                printer.ip_address,
                printer.access_code,
                timelapse_dir,
                timeout=_PRINTER_MEDIA_LIST_TIMEOUT_SECONDS,
                printer_model=printer.model,
            )
            any_timelapse_directory_available |= listing.available
            candidates = [
                file
                for file in listing.files
                if not file.get("is_directory") and str(file.get("name") or "").lower().endswith(VIDEO_SUFFIXES)
            ]
            if candidates:
                videos = candidates
                break
        if not any_timelapse_directory_available:
            response["warnings"].append("timelapse_unavailable")
        if videos:
            baseline = set(archive.timelapse_baseline or [])
            eligible = [
                file
                for file in videos
                if str(file.get("name") or "") not in baseline
                and Path(str(file.get("name") or "")).stem not in claimed_timelapse_stems
            ]
            if archive.timelapse_baseline is not None:
                candidate = eligible[0] if len(eligible) == 1 else None
            else:
                candidate, _ = _match_timelapse_by_timestamp(eligible, archive.started_at)
            if candidate is not None:
                remote_files.append(
                    {
                        "name": candidate.get("name"),
                        "path": candidate.get("path"),
                        "size": candidate.get("size") or 0,
                        "mtime": candidate.get("mtime"),
                        "kind": "timelapse",
                    }
                )

    if ftps_handshake_blocked(printer.ip_address):
        response["warnings"].append("ipcam_unavailable")
        response["remote_files"] = remote_files
        return response

    ipcam_listing = await list_files_result_async(
        printer.ip_address,
        printer.access_code,
        "/ipcam",
        timeout=_PRINTER_MEDIA_LIST_TIMEOUT_SECONDS,
        printer_model=printer.model,
    )
    if ipcam_listing.available:
        for file in match_ipcam_chunks(ipcam_listing.files, archive.started_at, archive.completed_at):
            remote_files.append(
                {
                    "name": file.get("name"),
                    "path": file.get("path") or f"/ipcam/{file.get('name')}",
                    "size": file.get("size") or 0,
                    "mtime": file.get("mtime"),
                    "kind": "ipcam",
                }
            )
    else:
        response["warnings"].append("ipcam_unavailable")

    response["remote_files"] = remote_files
    return response


@router.post("/{archive_id}/media-download-token")
async def create_archive_media_download_token(
    archive_id: int,
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(Permission.ARCHIVES_READ_ALL, Permission.ARCHIVES_READ_OWN)
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Mint a single-use token bound to an archive's attached timelapse."""

    from backend.app.core.auth import create_slicer_download_token

    user, can_read_all = auth_result
    async with database.async_session() as db:
        archive = _ensure_archive_visible(
            await ArchiveService(db).get_archive(archive_id), user, can_read_all, printer_scope
        )
    if not archive.timelapse_path:
        raise HTTPException(404, "Timelapse not found")
    timelapse_path = settings.base_dir / archive.timelapse_path
    if not await asyncio.to_thread(timelapse_path.is_file):
        raise HTTPException(404, "Timelapse file not found")
    return {
        "token": await create_slicer_download_token("archive-timelapse", archive_id),
        "filename": timelapse_path.name,
    }


@router.get("/{archive_id}/media/dl/{token}/{filename}")
async def download_archive_media_with_token(
    archive_id: int,
    token: str,
    filename: str,
):
    """Consume a resource-bound token and stream an attached timelapse."""

    from backend.app.core.auth import verify_slicer_download_token

    if not await verify_slicer_download_token(token, "archive-timelapse", archive_id):
        return download_error_response(403, "This download link has already been used or has expired.")
    async with database.async_session() as db:
        archive = await ArchiveService(db).get_archive(archive_id)
    if not archive or not archive.timelapse_path:
        return download_error_response(404, "This print has no attached timelapse.")
    timelapse_path = settings.base_dir / archive.timelapse_path
    if not await asyncio.to_thread(timelapse_path.is_file):
        return download_error_response(404, "The attached timelapse is no longer on disk.")
    safe_filename = safe_download_filename(filename, fallback=timelapse_path.name)
    return FileResponse(
        path=timelapse_path,
        filename=safe_filename,
        headers={"Content-Disposition": build_content_disposition(safe_filename)},
    )


@router.get("/{archive_id}/timelapse")
async def get_timelapse(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_media_token_ownership(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get the timelapse video.

    Requires a media token query param (?token=xxx) when auth is enabled, and
    returns 404 for an archive the caller may not read (#3025).
    """
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)
    if not archive.timelapse_path:
        raise HTTPException(404, "Timelapse not found")

    timelapse_path = settings.base_dir / archive.timelapse_path
    if not timelapse_path.exists():
        raise HTTPException(404, "Timelapse file not found")

    # Use file modification time as ETag to bust cache after processing
    mtime = int(timelapse_path.stat().st_mtime)

    # Detect media type from file extension (AVI from P1S before background conversion)
    suffix = timelapse_path.suffix.lower()
    media_type = {".mp4": "video/mp4", ".avi": "video/x-msvideo", ".mkv": "video/x-matroska"}.get(suffix, "video/mp4")
    ext = suffix if suffix in (".mp4", ".avi", ".mkv") else ".mp4"

    return FileResponse(
        path=timelapse_path,
        media_type=media_type,
        filename=f"{archive.print_name or 'timelapse'}{ext}",
        headers={
            "Cache-Control": "no-cache, must-revalidate",
            "ETag": f'"{mtime}"',
        },
    )


@router.delete("/{archive_id}/timelapse")
async def delete_timelapse(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_DELETE_ALL,
            Permission.ARCHIVES_DELETE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Remove the timelapse video from an archive."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    if not archive.timelapse_path:
        raise HTTPException(404, "No timelapse attached to this archive")

    # Delete the file
    timelapse_path = settings.base_dir / archive.timelapse_path
    if timelapse_path.exists():
        timelapse_path.unlink()

    # Clear the path in database
    archive.timelapse_path = None
    await db.commit()

    return {"status": "deleted"}


@router.post("/{archive_id}/timelapse/scan")
async def scan_timelapse(
    archive_id: int,
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Scan printer for timelapse matching this archive and attach it."""
    from backend.app.core.database import async_session
    from backend.app.models.printer import Printer
    from backend.app.services.bambu_ftp import (
        delete_archived_timelapse,
        download_file_bytes_async,
        ftps_handshake_blocked,
        get_ftp_retry_settings,
        list_files_async,
        remote_file_settled,
        with_ftp_retry,
    )

    # Read the archive + printer in a short session and release the pooled DB
    # connection BEFORE the FTP scan/download below — a timelapse pull walks
    # several directories and fetches a 100MB+ video, so holding Depends(get_db)
    # across it pinned one connection idle-in-transaction for minutes (#2572).
    # Scalar columns stay readable on the detached rows (expire_on_commit=False);
    # the attach at the end runs in its own fresh short session.
    async with async_session() as db:
        archive = await ArchiveService(db).get_archive(archive_id)
        if not archive:
            raise HTTPException(404, "Archive not found")

        if archive.timelapse_path:
            return {"status": "exists", "message": "Timelapse already attached"}

        if not archive.printer_id:
            raise HTTPException(400, "Archive has no associated printer")

        printer_scope.ensure(archive.printer_id)
        result = await db.execute(select(Printer).where(Printer.id == archive.printer_id))
        printer = result.scalar_one_or_none()
        if not printer:
            raise HTTPException(404, "Printer not found")

    # Get base name from archive filename (without .3mf extension)
    base_name = Path(archive.filename).stem

    # Scan timelapse directory on printer
    # Different printer models use different paths
    files = []
    for timelapse_path in ["/timelapse", "/timelapse/video", "/record", "/recording"]:
        if ftps_handshake_blocked(printer.ip_address):
            break
        try:
            files = await list_files_async(
                printer.ip_address, printer.access_code, timelapse_path, printer_model=printer.model
            )
            if files:
                break
        except Exception:
            continue
    if not files:
        # "Couldn't reach the printer" and "the printer has no timelapse
        # directory" are different problems with different fixes, and both used
        # to come back as one 500 (#2780). Nothing here will work while the
        # printer's file service is not answering over TLS, so say that rather
        # than reporting an empty directory.
        if ftps_handshake_blocked(printer.ip_address):
            raise HTTPException(
                503,
                f"Printer {printer.ip_address} is not answering its file service over TLS. "
                "Bambuddy will try again shortly.",
            )
        raise HTTPException(404, "No timelapse directory found on the printer")

    # Look for matching timelapse
    matching_file = None
    video_files = [
        f for f in files if not f.get("is_directory") and f.get("name", "").lower().endswith((".mp4", ".avi"))
    ]

    # Strategy 0: snapshot diff against the baseline captured at print start
    # (#2704). This is the same comparison the automatic scan makes, and the
    # only one here that doesn't depend on the printer's clock — a printer in
    # LAN-only mode can't reach Bambu's NTP server, so the timestamps in both
    # the filename and the FTP mtime can be days out. One reporter's P1S was
    # six and a half days off, which defeats every strategy below.
    #
    # When a baseline exists it is authoritative and the clock-based strategies
    # are skipped entirely: they can only turn an honest "pick one yourself"
    # into a confident wrong answer. Those strategies stay for archives created
    # before the baseline was persisted.
    used_baseline = archive.timelapse_baseline is not None
    if used_baseline:
        baseline = set(archive.timelapse_baseline)
        async with async_session() as db:
            claimed = await _claimed_timelapse_stems(db, archive.printer_id, archive_id)
        candidates = [
            f for f in video_files if f.get("name", "") not in baseline and Path(f.get("name", "")).stem not in claimed
        ]
        if len(candidates) == 1:
            matching_file = candidates[0]
            logger.info("Matched timelapse by print-start baseline: %s", matching_file.get("name"))
        elif candidates:
            # Ambiguous — offer only the plausible files instead of guessing.
            video_files = candidates
            logger.info("Baseline left %s unclaimed candidates for archive %s", len(candidates), archive_id)
        else:
            logger.info("Baseline shows no unclaimed new video on the printer for archive %s", archive_id)

    # Strategy 1: Match by print name in filename
    if not used_baseline:
        for f in video_files:
            fname = f.get("name", "")
            if base_name.lower() in fname.lower():
                matching_file = f
                break

    # Strategy 2: Match by timestamp proximity against print START time.
    # Bambu timelapse filename embeds the print start time in printer-local clock.
    # See _match_timelapse_by_timestamp for the offset-search rationale and why we
    # intentionally don't try to match filename against end time here.
    if not used_baseline and not matching_file and archive.started_at:
        candidate, diff = _match_timelapse_by_timestamp(video_files, archive.started_at)
        if candidate is not None:
            matching_file = candidate
            logger.info("Matched timelapse by timestamp: %s (diff: %s)", candidate.get("name"), diff)

    # Strategy 3: Use file modification time from FTP listing
    # This handles cases where printer's filename timestamp is wrong but file mtime is correct
    if not used_baseline and not matching_file and (archive.started_at or archive.completed_at or archive.created_at):
        from datetime import datetime, timedelta

        _archive_start = archive.started_at
        archive_end = archive.completed_at or archive.created_at
        best_match = None
        best_diff = timedelta(hours=24)

        for f in video_files:
            mtime = f.get("mtime")
            if mtime:
                # Timelapse file should be modified during or shortly after the print
                # The mtime should be close to completion time (video finishes when print ends)
                if archive_end:
                    diff = abs(mtime - archive_end)
                    if diff < best_diff:
                        best_diff = diff
                        best_match = f
                        logger.debug(
                            f"Timelapse mtime match candidate: {f.get('name')}, mtime: {mtime}, diff from end: {diff}"
                        )

        if best_match and best_diff < timedelta(hours=2):
            matching_file = best_match
            logger.info("Matched timelapse by file mtime: %s (diff: %s)", best_match.get("name"), best_diff)

    # Strategy 4: If only one timelapse exists and archive was recently completed, use it
    # This handles cases where printer clock is wrong or timezone issues exist
    if not used_baseline and not matching_file and len(video_files) == 1:
        from datetime import datetime, timedelta, timezone

        archive_completed = archive.completed_at or archive.created_at
        if archive_completed:
            if archive_completed.tzinfo is None:
                archive_completed = archive_completed.replace(tzinfo=timezone.utc)
            time_since_completion = datetime.now(timezone.utc) - archive_completed
            # If archive was completed within the last hour, assume the single timelapse is for it
            if time_since_completion < timedelta(hours=1):
                matching_file = video_files[0]
                logger.info("Using single timelapse file as fallback: %s", video_files[0].get("name"))

    # Note: We intentionally don't use a "most recent file" fallback because
    # we can't verify if timelapse was actually enabled for this print.
    # Instead, return the list of available files for manual selection.

    if not matching_file:
        # Return available files for manual selection
        available_files = [
            {
                "name": f.get("name"),
                "path": f.get("path"),
                "size": f.get("size"),
                "mtime": f.get("mtime").isoformat() if f.get("mtime") else None,
            }
            for f in video_files
        ]
        # Sort by mtime descending (most recent first)
        available_files.sort(key=lambda x: x.get("mtime") or "", reverse=True)
        return {
            "status": "not_found",
            "message": "No matching timelapse found - please select manually",
            "available_files": available_files,
        }

    # Download the timelapse - use the full path from the file listing
    remote_path = matching_file.get("path") or f"/timelapse/{matching_file['name']}"

    # Get FTP retry settings
    ftp_retry_enabled, ftp_retry_count, ftp_retry_delay, ftp_timeout = await get_ftp_retry_settings()

    if ftp_retry_enabled:
        timelapse_data = await with_ftp_retry(
            download_file_bytes_async,
            printer.ip_address,
            printer.access_code,
            remote_path,
            socket_timeout=ftp_timeout,
            printer_model=printer.model,
            expected_size=matching_file.get("size"),
            max_retries=ftp_retry_count,
            retry_delay=ftp_retry_delay,
            operation_name=f"Download timelapse {matching_file['name']}",
            cooloff_ip=printer.ip_address,
        )
    else:
        timelapse_data = await download_file_bytes_async(
            printer.ip_address,
            printer.access_code,
            remote_path,
            socket_timeout=ftp_timeout,
            printer_model=printer.model,
            expected_size=matching_file.get("size"),
        )

    if not timelapse_data:
        raise HTTPException(500, "Failed to download timelapse")

    # Confirm the printer has finished writing before we commit to this file and
    # delete the original: matching the listing's size proves we got what it
    # said, not that the file was complete (#2704).
    if not await remote_file_settled(
        printer.ip_address,
        printer.access_code,
        remote_path,
        len(timelapse_data),
        printer_model=printer.model,
    ):
        raise HTTPException(409, "The printer is still writing this video — try again in a moment")

    # Attach in a fresh short session (the read session was released before FTP).
    async with async_session() as db:
        success = await ArchiveService(db).attach_timelapse(archive_id, timelapse_data, matching_file["name"])

    if not success:
        raise HTTPException(500, "Failed to attach timelapse")

    # Safe now, and only now: the transfer matched the size the listing reported
    # and the bytes are committed to the archive (#2704).
    await delete_archived_timelapse(
        printer.ip_address,
        printer.access_code,
        remote_path,
        verified=matching_file.get("size") is not None,
        printer_model=printer.model,
        printer_name=printer.name,
    )

    return {
        "status": "attached",
        "message": f"Timelapse '{matching_file['name']}' attached successfully",
        "filename": matching_file["name"],
    }


@router.post("/{archive_id}/timelapse/select")
async def select_timelapse(
    archive_id: int,
    filename: str = Query(..., description="Timelapse filename to attach"),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Manually select a timelapse from the printer to attach."""
    from backend.app.core.database import async_session
    from backend.app.models.printer import Printer
    from backend.app.services.bambu_ftp import (
        delete_archived_timelapse,
        download_file_bytes_async,
        get_ftp_retry_settings,
        list_files_async,
        remote_file_settled,
        with_ftp_retry,
    )

    # Read the archive + printer in a short session and release the pooled DB
    # connection BEFORE the FTP scan/download below (#2572); scalars stay
    # readable after close (expire_on_commit=False), the attach reopens one.
    async with async_session() as db:
        archive = await ArchiveService(db).get_archive(archive_id)
        if not archive:
            raise HTTPException(404, "Archive not found")

        if not archive.printer_id:
            raise HTTPException(400, "Archive has no associated printer")

        printer_scope.ensure(archive.printer_id)
        result = await db.execute(select(Printer).where(Printer.id == archive.printer_id))
        printer = result.scalar_one_or_none()
        if not printer:
            raise HTTPException(404, "Printer not found")

    # Find the file on the printer
    files = []
    remote_path = None
    expected_size = None
    for timelapse_dir in ["/timelapse", "/timelapse/video", "/record", "/recording"]:
        try:
            files = await list_files_async(
                printer.ip_address, printer.access_code, timelapse_dir, printer_model=printer.model
            )
            for f in files:
                if f.get("name") == filename:
                    remote_path = f.get("path") or f"{timelapse_dir}/{filename}"
                    expected_size = f.get("size")
                    break
            if remote_path:
                break
        except Exception:
            continue

    if not remote_path:
        raise HTTPException(404, f"Timelapse '{filename}' not found on printer")

    # Download and attach
    ftp_retry_enabled, ftp_retry_count, ftp_retry_delay, ftp_timeout = await get_ftp_retry_settings()

    if ftp_retry_enabled:
        timelapse_data = await with_ftp_retry(
            download_file_bytes_async,
            printer.ip_address,
            printer.access_code,
            remote_path,
            socket_timeout=ftp_timeout,
            printer_model=printer.model,
            expected_size=expected_size,
            max_retries=ftp_retry_count,
            retry_delay=ftp_retry_delay,
            operation_name=f"Download timelapse {filename}",
            cooloff_ip=printer.ip_address,
        )
    else:
        timelapse_data = await download_file_bytes_async(
            printer.ip_address,
            printer.access_code,
            remote_path,
            socket_timeout=ftp_timeout,
            printer_model=printer.model,
            expected_size=expected_size,
        )

    if not timelapse_data:
        raise HTTPException(500, "Failed to download timelapse")

    # Confirm the printer has finished writing before we commit to this file and
    # delete the original: matching the listing's size proves we got what it
    # said, not that the file was complete (#2704).
    if not await remote_file_settled(
        printer.ip_address,
        printer.access_code,
        remote_path,
        len(timelapse_data),
        printer_model=printer.model,
    ):
        raise HTTPException(409, "The printer is still writing this video — try again in a moment")

    # Attach in a fresh short session (the read session was released before FTP).
    async with async_session() as db:
        success = await ArchiveService(db).attach_timelapse(archive_id, timelapse_data, filename)
    if not success:
        raise HTTPException(500, "Failed to attach timelapse")

    # Safe now, and only now: the transfer matched the size the listing reported
    # and the bytes are committed to the archive (#2704).
    await delete_archived_timelapse(
        printer.ip_address,
        printer.access_code,
        remote_path,
        verified=expected_size is not None,
        printer_model=printer.model,
        printer_name=printer.name,
    )

    return {
        "status": "attached",
        "message": f"Timelapse '{filename}' attached successfully",
        "filename": filename,
    }


@router.post("/{archive_id}/timelapse/upload")
async def upload_timelapse(
    archive_id: int,
    file: UploadFile = File(...),
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Manually upload a timelapse video to an archive."""
    service = ArchiveService(db)
    archive = await service.get_archive(archive_id)
    if not archive or not printer_scope.allows(archive.printer_id):
        raise HTTPException(404, "Archive not found")

    if not file.filename or not file.filename.endswith((".mp4", ".avi", ".mkv")):
        raise HTTPException(400, "File must be a video file (.mp4, .avi, .mkv)")

    content = await file.read()
    safe_filename = _safe_filename(file.filename)
    success = await service.attach_timelapse(archive_id, content, safe_filename)

    if not success:
        raise HTTPException(500, "Failed to attach timelapse")

    return {"status": "attached", "filename": safe_filename}


@router.get("/{archive_id}/timelapse/info")
async def get_timelapse_info(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get timelapse video metadata for editor."""
    from backend.app.schemas.timelapse import TimelapseInfoResponse
    from backend.app.services.timelapse_processor import TimelapseProcessor

    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)
    if not archive.timelapse_path:
        raise HTTPException(404, "Timelapse not found")

    timelapse_path = settings.base_dir / archive.timelapse_path
    if not timelapse_path.exists():
        raise HTTPException(404, "Timelapse file not found")

    try:
        processor = TimelapseProcessor(timelapse_path)
        info = await processor.get_info()
        return TimelapseInfoResponse(**info)
    except Exception as e:
        logger.error("Failed to get timelapse info: %s", e)
        raise HTTPException(500, f"Failed to get video info: {str(e)}")


@router.get("/{archive_id}/timelapse/thumbnails")
async def get_timelapse_thumbnails(
    archive_id: int,
    count: int = Query(10, ge=1, le=30),
    width: int = Query(160, ge=80, le=320),
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Generate timeline thumbnail frames for visual scrubbing."""
    import base64

    from backend.app.schemas.timelapse import ThumbnailResponse
    from backend.app.services.timelapse_processor import TimelapseProcessor

    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)
    if not archive.timelapse_path:
        raise HTTPException(404, "Timelapse not found")

    timelapse_path = settings.base_dir / archive.timelapse_path
    if not timelapse_path.exists():
        raise HTTPException(404, "Timelapse file not found")

    try:
        processor = TimelapseProcessor(timelapse_path)
        thumbnails = await processor.generate_thumbnails(count, width)

        return ThumbnailResponse(
            thumbnails=[base64.b64encode(data).decode() for _, data in thumbnails],
            timestamps=[ts for ts, _ in thumbnails],
        )
    except Exception as e:
        logger.error("Failed to generate thumbnails: %s", e)
        raise HTTPException(500, f"Failed to generate thumbnails: {str(e)}")


@router.post("/{archive_id}/timelapse/process")
async def process_timelapse(
    archive_id: int,
    trim_start: float = Form(0),
    trim_end: float = Form(None),
    speed: float = Form(1.0),
    save_mode: str = Form("new"),
    output_filename: str = Form(None),
    audio: UploadFile = File(None),
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Process timelapse with trim, speed, and optional audio overlay."""
    import shutil
    import tempfile

    from backend.app.schemas.timelapse import ProcessResponse
    from backend.app.services.timelapse_processor import TimelapseProcessor

    # Validate speed
    if not 0.25 <= speed <= 4.0:
        raise HTTPException(400, "Speed must be between 0.25 and 4.0")

    if save_mode not in ("replace", "new"):
        raise HTTPException(400, "save_mode must be 'replace' or 'new'")

    service = ArchiveService(db)
    archive = await service.get_archive(archive_id)
    if not archive or not archive.timelapse_path or not printer_scope.allows(archive.printer_id):
        raise HTTPException(404, "Timelapse not found")

    timelapse_path = settings.base_dir / archive.timelapse_path
    if not timelapse_path.exists():
        raise HTTPException(404, "Timelapse file not found")

    archive_dir = timelapse_path.parent

    # Handle audio file
    audio_temp_path = None
    if audio and audio.filename:
        # Validate audio file extension
        if not audio.filename.lower().endswith((".mp3", ".wav", ".m4a", ".aac", ".ogg")):
            raise HTTPException(400, "Audio must be .mp3, .wav, .m4a, .aac, or .ogg")

        audio_content = await audio.read()
        # Extract and validate suffix to prevent path injection
        suffix = Path(audio.filename).suffix.lower()
        if suffix not in (".mp3", ".wav", ".m4a", ".aac", ".ogg"):
            raise HTTPException(400, "Invalid audio file extension")
        audio_temp_path = Path(tempfile.gettempdir()) / f"audio_{archive_id}{suffix}"
        audio_temp_path.write_bytes(audio_content)

    try:
        processor = TimelapseProcessor(timelapse_path)

        # Determine output path
        if save_mode == "replace":
            # Process to temp file first, then replace
            temp_output = Path(tempfile.gettempdir()) / f"processed_{archive_id}.mp4"
            output_path = temp_output
        else:
            # Save as new file alongside original
            filename = output_filename or f"{archive.print_name or 'timelapse'}_edited.mp4"
            # Sanitize filename - remove path separators and traversal sequences
            filename = "".join(c for c in filename if c.isalnum() or c in "._- ")
            # Prevent path traversal
            if ".." in filename or not filename or filename.startswith("."):
                filename = f"timelapse_{archive_id}_edited"
            if not filename.endswith(".mp4"):
                filename += ".mp4"
            output_path = archive_dir / filename  # SEC-PATH-OK: filename alnum-filtered + .. rejected above

        success = await processor.process(
            output_path=output_path,
            trim_start=trim_start,
            trim_end=trim_end,
            speed=speed,
            audio_path=audio_temp_path,
        )

        if not success:
            raise HTTPException(500, "Video processing failed")

        # Handle save mode
        if save_mode == "replace":
            # Replace original file
            shutil.move(str(output_path), str(timelapse_path))
            final_path = archive.timelapse_path
            message = "Timelapse replaced successfully"
        else:
            final_path = str(output_path.relative_to(settings.base_dir))
            message = f"Saved as {output_path.name}"

        return ProcessResponse(
            status="completed",
            output_path=final_path,
            message=message,
        )

    except HTTPException:
        raise
    except Exception as e:
        logger.error("Timelapse processing failed: %s", e)
        raise HTTPException(500, f"Processing failed: {str(e)}")
    finally:
        # Cleanup temp audio file
        if audio_temp_path and audio_temp_path.exists():
            audio_temp_path.unlink()


# ============================================
# Photo Endpoints
# ============================================


@router.post("/{archive_id}/photos")
async def upload_photo(
    archive_id: int,
    file: UploadFile = File(...),
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_UPDATE_ALL,
            Permission.ARCHIVES_UPDATE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Upload a photo of the printed result."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    if not file.filename or not file.filename.lower().endswith((".jpg", ".jpeg", ".png", ".webp")):
        raise HTTPException(400, "File must be an image (.jpg, .jpeg, .png, .webp)")

    # Get archive directory. parents=True because an archive with no 3MF owns
    # <archive_dir>/<id>/, which nothing else has necessarily created yet.
    photos_dir = archive_photos_dir(archive)
    photos_dir.mkdir(parents=True, exist_ok=True)

    # Generate unique filename
    import uuid

    ext = Path(file.filename).suffix.lower()
    photo_filename = f"{uuid.uuid4().hex[:8]}{ext}"
    photo_path = photos_dir / photo_filename  # SEC-PATH-OK: photo_filename = uuid.uuid4().hex[:8] + ext

    # Save file
    content = await file.read()
    photo_path.write_bytes(content)

    # Update archive photos list (create new list to trigger SQLAlchemy change detection)
    photos = list(archive.photos or [])
    photos.append(photo_filename)
    archive.photos = photos

    await db.commit()
    await db.refresh(archive)

    return {"status": "uploaded", "filename": photo_filename, "photos": archive.photos}


@router.get("/{archive_id}/photos/{filename}")
async def get_photo(
    archive_id: int,
    filename: str,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_media_token_ownership(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get a specific photo.

    Requires a media token query param (?token=xxx) when auth is enabled, and
    returns 404 for an archive the caller may not read (#3025).
    """
    user, can_read_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_read_all, printer_scope)

    # Membership check first — UUID-generated names on upload mean any URL
    # filename that doesn't appear here is by definition not a real photo.
    # Mirrors the delete handler below; previously this endpoint had no
    # membership check at all and joined `filename` straight to disk.
    if not archive.photos or filename not in archive.photos:
        raise HTTPException(404, "Photo not found")

    # Defence-in-depth: even though the membership check above already
    # constrains `filename` to UUID-generated names from upload,
    # find_archive_photo resolves and containment-checks each candidate,
    # guarding against future code paths that might populate
    # `archive.photos` from a less-trusted source.
    photo_path = find_archive_photo(archive, filename)

    if photo_path is None:
        raise HTTPException(404, "Photo not found")

    # Determine media type
    ext = Path(filename).suffix.lower()
    media_types = {
        ".jpg": "image/jpeg",
        ".jpeg": "image/jpeg",
        ".png": "image/png",
        ".webp": "image/webp",
    }
    media_type = media_types.get(ext, "image/jpeg")

    return FileResponse(path=photo_path, media_type=media_type)


@router.delete("/{archive_id}/photos/{filename}")
async def delete_photo(
    archive_id: int,
    filename: str,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_DELETE_ALL,
            Permission.ARCHIVES_DELETE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Delete a photo."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    if not archive.photos or filename not in archive.photos:
        raise HTTPException(404, "Photo not found")

    # Delete file — same lookup as get_photo above, so a photo that is
    # readable is also deletable. Removing the name while leaving the file is
    # how a no-3MF archive accumulated photos nobody could see or remove.
    photo_path = find_archive_photo(archive, filename)
    if photo_path is not None:
        photo_path.unlink()

    # Update archive photos list
    photos = [p for p in archive.photos if p != filename]
    archive.photos = photos if photos else None

    await db.commit()

    return {"status": "deleted", "photos": archive.photos}


# ============================================
# Post-print outcome confirmation (#1898)
# ============================================

# English-only on purpose: this page is rendered by the backend for a phone
# browser that carries no session and therefore no language preference.
_VERDICT_LABELS = {"good": "Good part", "reject": "Rejected"}
_VERDICT_SOURCE_PHRASES = {
    "dialog": "in the app",
    "link": "with a one-tap link",
    "plate_clear": "automatically when the print plate was cleared",
    "printer_card": "from the printer card",
    "api": "through the API",
    "reaction": "with a reaction in chat",
}


def _confirm_page(glyph: str, heading: str, body: str) -> str:
    """The small HTML page every one-tap outcome link renders."""
    return (
        "<!doctype html><html><head><meta name='viewport' content='width=device-width, initial-scale=1'>"
        "<title>Bambuddy</title></head>"
        "<body style='font-family: system-ui, sans-serif; background:#1a1d21; color:#fff; display:flex;"
        " align-items:center; justify-content:center; min-height:90vh; margin:0'>"
        f"<div style='text-align:center; padding:0 1.5rem; max-width:32rem'>"
        f"<div style='font-size:3rem'>{glyph}</div><h2>{heading}</h2>{body}</div></body></html>"
    )


async def _render_already_answered_page(db: AsyncSession, archive: PrintArchive) -> str:
    """Explain a spent one-tap link instead of calling it invalid.

    The plate-clear default, the app and the other link all answer the same
    prompt, so the button in a push notification is routinely tapped after the
    question is settled. Report the verdict on file, when and how it landed,
    and where to change it.
    """
    from backend.app.api.routes.settings import get_external_base_url

    name = html_escape(archive.print_name or archive.filename or "")
    # The verdict's own timestamp, not the moment the token was spent: a
    # verdict changed later in the app would otherwise be dated by the older
    # event. Pre-#1898 rows have neither, and then the page omits the date.
    used_at = archive.user_verdict_at or archive.confirm_token_used_at
    if used_at is not None and used_at.tzinfo is not None:
        used_at = used_at.astimezone(timezone.utc)
    when = used_at.strftime("%Y-%m-%d %H:%M UTC") if used_at else None
    how = _VERDICT_SOURCE_PHRASES.get(archive.user_verdict_source or "")
    label = _VERDICT_LABELS.get(archive.user_verdict or "")

    if label:
        recorded = f"Recorded as <strong>{label}</strong>"
        if how:
            recorded += f" {how}"
        if when:
            recorded += f" on {when}"
        recorded += "."
    else:
        # The verdict was cleared again in the app; the link stays spent.
        recorded = "This prompt was already answered and the verdict has since been cleared."

    base = await get_external_base_url(db)
    link = html_escape(f"{base}/archives?confirm={archive.id}", quote=True)
    glyph = "&#10003;" if archive.user_verdict == "good" else "&#10007;" if archive.user_verdict else "&#8505;"
    return _confirm_page(
        glyph,
        "Already answered",
        f"<p style='color:#9ca3af'>{name}</p>"
        f"<p style='color:#9ca3af'>{recorded}</p>"
        f"<p><a style='color:#00ae42' href='{link}'>Open this print in Bambuddy</a> to change it.</p>",
    )


def _render_confirm_prompt_page(request: Request, archive: PrintArchive, verdict: str) -> str:
    """The page a one-tap verdict link opens. It has recorded nothing yet.

    GET is where link unfurlers, mail-security scanners and browser prefetchers
    arrive, uninvited and within seconds of the message being sent, so GET
    writes nothing at all -- the verdict is recorded by the form below, over
    POST, which none of them issue.

    The form submits itself only for a page opened from a notification button,
    which is what keeps the operator at one tap. The marker for that
    (``?tap=1``) is put on the Telegram inline keyboard's URLs and nowhere else
    -- never on a URL that travels in message text -- so a mail-security
    sandbox that renders HTML and runs JavaScript cannot press the button for
    the operator: it only ever sees the unmarked URL out of the body. The
    User-Agent heuristic still runs on top of that, but it is no longer the
    only thing between a scanner and the write; it cannot be, because such a
    sandbox sends an ordinary Chrome string.

    Every other arrival -- an unmarked link somebody typed or mailed, a browser
    with JavaScript off -- gets the same page and presses the button.
    """
    name = html_escape(archive.print_name or archive.filename or "")
    # Escaped although the route only lets good/reject through: the page must
    # not depend on a check made in another function.
    label = html_escape(_VERDICT_LABELS.get(verdict, verdict))
    # No action attribute: the form posts back to the URL the page was loaded
    # from, so it works behind a reverse proxy and on a host external_url does
    # not name.
    form = (
        "<form method='post' id='confirm-form'>"
        "<button type='submit' style='font: inherit; font-size:1.1rem; padding:0.9rem 2rem;"
        " border:0; border-radius:0.5rem; background:#00ae42; color:#fff'>Yes, record it</button>"
        "</form>"
    )
    # The SPA's CSP allows inline scripts only with the per-request nonce the
    # security-headers middleware mints (main.py). Without one -- no middleware,
    # an unmarked URL, or an unattended-looking caller -- the page simply waits
    # for the button.
    nonce = getattr(request.state, "csp_nonce", None)
    script = ""
    if nonce and is_one_tap_request(request.query_params) and not is_unattended_fetch(request.method, request.headers):
        script = (
            f"<script nonce='{html_escape(nonce, quote=True)}'>"
            "document.getElementById('confirm-form').submit();</script>"
        )
    return _confirm_page(
        "&#63;",
        "Confirm this outcome",
        f"<p style='color:#9ca3af'>{name}</p>"
        f"<p style='color:#9ca3af'>Record this print as <strong>{label}</strong>?</p>"
        f"{form}{script}",
    )


def _confirm_response(html: str):
    """The one-tap pages, never cached.

    A proxy holding on to "Saved" or to the prompt would answer a later tap
    from its cache, and the prompt page is a capability URL either way.
    """
    from fastapi.responses import HTMLResponse

    return HTMLResponse(html, headers={"Cache-Control": "no-store"})


async def _load_confirmable_archive(db: AsyncSession, token: str, verdict: str) -> PrintArchive:
    """Resolve a one-tap capability token, or raise the route's 400/404."""
    if verdict not in ("good", "reject"):
        raise HTTPException(400, "Verdict must be 'good' or 'reject'")

    result = await db.execute(
        select(PrintArchive).where(PrintArchive.confirm_token == token, PrintArchive.confirm_token.isnot(None))
    )
    archive = result.scalar_one_or_none()
    if not archive:
        raise HTTPException(404, "Confirmation link is invalid or was already used")
    return archive


@router.get("/confirm/{token}/{verdict}")
async def confirm_outcome_page(
    request: Request,
    token: str,
    verdict: str,
    db: AsyncSession = Depends(get_db),
):
    """Open a one-tap verdict link. Reads only — the verdict is recorded by POST.

    This used to be the route that recorded, and that was the defect: a GET
    that changes state is answered by everything that walks a URL. Telegram
    and Slack fetch the links in a message body to build a preview card, mail
    gateways detonate them before delivery, browsers prefetch them — any one
    of those spent the single-use token and settled the outcome before the
    operator had read the question, always in the "good" direction because
    good_url came first. Suppressing previews per channel does not cover the
    proxies and scanners in between; only removing the write from GET does.

    So GET now hands back the prompt page and nothing else. The page's form
    POSTs to this same URL, and :func:`confirm_outcome_by_token` records it.
    The human cost is zero for the path the feature is built around: a URL
    opened from a notification button carries ``?tap=1`` and the page submits
    itself, so that tap is still the only tap. Nothing else gets that script,
    including a scanner that runs JavaScript -- the marker is on the buttons,
    not in the message text a scanner reads.
    """
    archive = await _load_confirmable_archive(db, token, verdict)

    if archive.confirm_token_used_at is not None:
        # Answered already — by hand, by the other link, by the plate-clear
        # default or by a reaction. Report what is on file and change nothing.
        return _confirm_response(await _render_already_answered_page(db, archive))

    return _confirm_response(_render_confirm_prompt_page(request, archive, verdict))


@router.post("/confirm/{token}/{verdict}")
async def confirm_outcome_by_token(
    token: str,
    verdict: str,
    db: AsyncSession = Depends(get_db),
):
    """Record a print-outcome verdict via the capability token from a push notification.

    Deliberately unauthenticated: the token IS the credential. It is a 256-bit
    per-archive capability, minted when the confirmation prompt fires, and it
    only ever grants writing good/reject on that one archive, exactly once.
    "Exactly once" is enforced by ``confirm_token_used_at`` rather than by
    dropping the token value, so a link for a print that was already answered
    can be recognised and explained instead of looking broken.

    POST is what keeps the capability the operator's: unfurlers, scanners and
    prefetchers issue GET, and the GET route above writes nothing. The two
    callers that reach here are the prompt page's form and the ntfy action
    button, which performs its own request from the phone and is configured
    with ``method=POST``. Returns a small HTML page for the phone browser.
    """
    archive = await _load_confirmable_archive(db, token, verdict)

    if archive.confirm_token_used_at is not None:
        return _confirm_response(await _render_already_answered_page(db, archive))

    archive.user_verdict = verdict
    stamp_verdict(archive, "link")
    retire_confirm_token(archive)

    # Same mirror as the PATCH route (#1444): verdict-aware statistics read
    # print_log_entries, so the latest run must carry the verdict too.
    from backend.app.models.print_log import PrintLogEntry

    latest_entry = await db.scalar(
        select(PrintLogEntry).where(PrintLogEntry.archive_id == archive.id).order_by(PrintLogEntry.id.desc()).limit(1)
    )
    if latest_entry is not None:
        latest_entry.user_verdict = verdict

    await db.commit()

    label = "Good part" if verdict == "good" else "Rejected"
    name = archive.print_name or archive.filename
    return _confirm_response(
        _confirm_page(
            "&#10003;" if verdict == "good" else "&#10007;",
            label,
            f"<p style='color:#9ca3af'>{html_escape(name)}</p>"
            "<p style='color:#9ca3af'>Saved &mdash; you can close this page.</p>",
        )
    )


# ============================================
# QR Code Endpoint
# ============================================


@router.get("/{archive_id}/qrcode")
async def get_qrcode(
    archive_id: int,
    request: Request,
    size: int = 200,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_media_token_ownership(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Generate a QR code that links to this archive.

    Requires a media token query param (?token=xxx) when auth is enabled, and
    returns 404 for an archive the caller may not read (#3025).
    """
    user, can_read_all = auth_result
    try:
        import qrcode
        from PIL import Image as PILImage
    except ImportError:
        raise HTTPException(500, "QR code generation not available - qrcode package not installed")

    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_read_all, printer_scope)

    # Build URL to archive download
    base_url = str(request.base_url).rstrip("/")
    archive_url = f"{base_url}/api/v1/archives/{archive_id}/download"

    # Generate QR code
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_M,
        box_size=10,
        border=2,
    )
    qr.add_data(archive_url)
    qr.make(fit=True)

    img = qr.make_image(fill_color="black", back_color="white")

    # Convert to PIL Image for resizing
    pil_img = img.get_image()

    # Resize if needed
    if size != 200:
        pil_img = pil_img.resize((size, size), PILImage.Resampling.LANCZOS)

    # Convert to bytes
    buffer = io.BytesIO()
    pil_img.save(buffer, format="PNG")
    buffer.seek(0)

    qr_filename = f"qr_{archive.print_name or archive_id}.png"
    return Response(
        content=buffer.getvalue(),
        media_type="image/png",
        headers={"Content-Disposition": build_content_disposition(qr_filename, disposition="inline")},
    )


@router.get("/{archive_id}/capabilities")
async def get_archive_capabilities(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Check what viewing capabilities are available for this 3MF file."""
    import defusedxml.ElementTree as ET

    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "File not found")

    has_model = False
    has_gcode = False
    has_source = False
    build_volume = {"x": 256, "y": 256, "z": 256}  # Default to X1/P1 size
    filament_colors: list[str] = []

    # Check if source 3MF exists - this is where actual mesh data typically lives
    source_path = None
    if archive.source_3mf_path:
        source_path = settings.base_dir / archive.source_3mf_path
        if source_path.exists():
            has_source = True

    # Helper function to check for mesh data and extract colors from a 3MF file
    def extract_3mf_info(zf_path: Path) -> tuple[bool, list[str], dict]:
        """Extract mesh presence, colors, and build volume from a 3MF file."""
        found_mesh = False
        colors: list[str] = []
        volume = {"x": 256, "y": 256, "z": 256}

        try:
            with zipfile.ZipFile(zf_path, "r") as zf:
                names = zf.namelist()

                # Check for 3D model - look for actual mesh data
                for name in names:
                    if name.endswith(".model"):
                        try:
                            content = zf.read(name).decode("utf-8")
                            if "<vertex" in content or "<mesh" in content:
                                found_mesh = True
                                break
                        except Exception:
                            pass  # Skip unreadable .model entries in archive

                # Extract filament colors from project_settings.config
                if "Metadata/project_settings.config" in names:
                    try:
                        config_content = zf.read("Metadata/project_settings.config").decode("utf-8")
                        config_data = json.loads(config_content)

                        # Parse printable_area: ['0x0', '256x0', '256x256', '0x256']
                        printable_area = config_data.get("printable_area", [])
                        if printable_area and len(printable_area) >= 3:
                            max_x = 0
                            max_y = 0
                            for coord in printable_area:
                                if "x" in coord:
                                    parts = coord.split("x")
                                    if len(parts) == 2:
                                        try:
                                            x, y = int(parts[0]), int(parts[1])
                                            max_x = max(max_x, x)
                                            max_y = max(max_y, y)
                                        except ValueError:
                                            pass  # Skip non-numeric printable_area coordinate
                            if max_x > 0 and max_y > 0:
                                volume["x"] = max_x
                                volume["y"] = max_y

                        # Parse printable_height
                        printable_height = config_data.get("printable_height")
                        if printable_height:
                            try:
                                volume["z"] = int(printable_height)
                            except (ValueError, TypeError):
                                pass  # Skip unparseable printable_height value

                        # Extract filament colors
                        raw_colors = config_data.get("filament_colour", [])
                        if raw_colors:
                            for color in raw_colors:
                                if color and isinstance(color, str):
                                    colors.append(color)
                    except Exception:
                        pass  # Skip malformed project_settings.config
        except zipfile.BadZipFile:
            pass  # File is not a valid zip/3MF archive

        return found_mesh, colors, volume

    # First check source 3MF for mesh data and colors (preferred for 3D model viewing)
    if has_source and source_path:
        source_has_mesh, source_colors, source_volume = extract_3mf_info(source_path)
        if source_has_mesh:
            has_model = True
        if source_colors:
            filament_colors = source_colors
        if source_volume["x"] != 256 or source_volume["y"] != 256 or source_volume["z"] != 256:
            build_volume = source_volume

    try:
        with zipfile.ZipFile(file_path, "r") as zf:
            names = zf.namelist()

            # Check for G-code in the sliced file. Shared with the library's
            # file-type classification so the card's badge and what the File
            # Manager makes of the same file cannot disagree (#2993).
            has_gcode = names_carry_gcode(names)

            # Check for 3D model in sliced file (fallback if no source)
            if not has_model:
                for name in names:
                    if name.endswith(".model"):
                        try:
                            content = zf.read(name).decode("utf-8")
                            if "<vertex" in content or "<mesh" in content:
                                has_model = True
                                break
                        except Exception:
                            pass  # Skip unreadable .model entries in archive

            # Extract filament colors from slice_info.config (for gcode preview)
            # These are the actual filaments used in the print, indexed by tool/extruder
            slice_colors: list[str] = []
            if "Metadata/slice_info.config" in names:
                try:
                    slice_content = zf.read("Metadata/slice_info.config").decode("utf-8")
                    root = ET.fromstring(slice_content)

                    filaments = root.findall(".//filament")
                    filament_map: dict[int, str] = {}
                    for f in filaments:
                        fid = f.get("id")
                        fcolor = f.get("color")
                        used_g = f.get("used_g", "0")
                        try:
                            used_amount = float(used_g)
                        except (ValueError, TypeError):
                            used_amount = 0

                        if fid is not None and fcolor:
                            try:
                                tool_id = int(fid) - 1
                                if tool_id >= 0 and used_amount > 0:
                                    filament_map[tool_id] = fcolor
                            except ValueError:
                                pass  # Skip filament entry with non-numeric ID

                    if filament_map:
                        max_tool = max(filament_map.keys())
                        for i in range(max_tool + 1):
                            slice_colors.append(filament_map.get(i, "#00AE42"))
                except Exception:
                    pass  # Skip malformed slice_info.config XML

            # Use slice_info colors if we don't have colors from source yet
            if not filament_colors and slice_colors:
                filament_colors = slice_colors

            # Extract build volume from sliced file if not already set from source
            if build_volume["x"] == 256 and build_volume["y"] == 256:
                if "Metadata/project_settings.config" in names:
                    try:
                        config_content = zf.read("Metadata/project_settings.config").decode("utf-8")
                        config_data = json.loads(config_content)

                        printable_area = config_data.get("printable_area", [])
                        if printable_area and len(printable_area) >= 3:
                            max_x = 0
                            max_y = 0
                            for coord in printable_area:
                                if "x" in coord:
                                    parts = coord.split("x")
                                    if len(parts) == 2:
                                        try:
                                            x, y = int(parts[0]), int(parts[1])
                                            max_x = max(max_x, x)
                                            max_y = max(max_y, y)
                                        except ValueError:
                                            pass  # Skip non-numeric printable_area coordinate
                            if max_x > 0 and max_y > 0:
                                build_volume["x"] = max_x
                                build_volume["y"] = max_y

                        printable_height = config_data.get("printable_height")
                        if printable_height:
                            try:
                                build_volume["z"] = int(printable_height)
                            except (ValueError, TypeError):
                                pass  # Skip unparseable printable_height value

                        # Fallback colors from project_settings if still empty
                        if not filament_colors:
                            raw_colors = config_data.get("filament_colour", [])
                            if raw_colors:
                                for color in raw_colors:
                                    if color and isinstance(color, str):
                                        filament_colors.append(color)
                    except Exception:
                        pass  # Skip malformed project_settings.config

    except zipfile.BadZipFile:
        raise HTTPException(400, "Invalid 3MF file")

    return {
        "has_model": has_model,
        "has_gcode": has_gcode,
        "has_source": has_source,
        "build_volume": build_volume,
        "filament_colors": filament_colors,
    }


@router.get("/{archive_id}/gcode")
async def get_gcode(
    archive_id: int,
    plate: int | None = None,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Extract and return G-code from the 3MF file.

    When *plate* is provided, returns the G-code for that specific plate
    (e.g. ``?plate=2`` returns ``Metadata/plate_2.gcode``). If omitted, falls
    back to the archive's lowest-numbered plate — not the first member in the
    zip, which is whatever order the slicer wrote and routinely puts plate 2
    ahead of plate 1.
    """
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "File not found")

    if plate is not None and plate < 1:
        raise HTTPException(400, "Plate index must be >= 1")

    try:
        with zipfile.ZipFile(file_path, "r") as zf:
            # Bambu 3MF files store G-code in Metadata/plate_X.gcode
            gcode_files = [n for n in zf.namelist() if n.startswith("Metadata/") and n.endswith(".gcode")]
            if not gcode_files:
                raise HTTPException(
                    404,
                    "No G-code found. This file hasn't been sliced yet - G-code is only available after slicing in Bambu Studio.",
                )

            if plate is not None:
                selected = select_plate_gcode_name(gcode_files, plate)
                if selected is None:
                    raise HTTPException(404, f"Plate {plate} not found in this archive")
            else:
                selected = default_plate_gcode_name(gcode_files)

            gcode_content = zf.read(selected).decode("utf-8")
            return Response(content=gcode_content, media_type="text/plain")
    except zipfile.BadZipFile:
        raise HTTPException(400, "Invalid 3MF file")
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(500, f"Error extracting G-code: {str(e)}")


@router.get("/{archive_id}/plate-preview")
async def get_plate_preview(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_media_token_ownership(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get the plate preview image from the 3MF file.

    Returns the slicer-generated plate thumbnail which shows the model
    with correct colors and positioning.

    Requires a media token query param (?token=xxx) when auth is enabled, and
    returns 404 for an archive the caller may not read (#3025).
    """
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "File not found")

    try:
        with zipfile.ZipFile(file_path, "r") as zf:
            names = zf.namelist()

            # Try to find plate preview images in order of preference
            # First look for the specific plate being printed (check slice_info for plate index)
            plate_num = 1
            if "Metadata/slice_info.config" in names:
                try:
                    import defusedxml.ElementTree as ET

                    slice_content = zf.read("Metadata/slice_info.config").decode("utf-8")
                    root = ET.fromstring(slice_content)
                    plate_elem = root.find(".//plate/metadata[@key='index']")
                    if plate_elem is not None:
                        plate_num = int(plate_elem.get("value", "1"))
                except Exception:
                    pass  # Default plate_num=1 if slice_info is missing or malformed

            # Try plate-specific image first, then fall back to plate_1
            preview_paths = [
                f"Metadata/plate_{plate_num}.png",
                "Metadata/plate_1.png",
                "Metadata/thumbnail.png",
            ]

            for preview_path in preview_paths:
                if preview_path in names:
                    image_data = zf.read(preview_path)
                    return Response(content=image_data, media_type="image/png")

            # If no plate image, try any PNG in Metadata
            for name in names:
                if name.startswith("Metadata/plate_") and name.endswith(".png") and "_small" not in name:
                    image_data = zf.read(name)
                    return Response(content=image_data, media_type="image/png")

            raise HTTPException(404, "No plate preview found in 3MF file")

    except zipfile.BadZipFile:
        raise HTTPException(400, "Invalid 3MF file")
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(500, f"Error extracting plate preview: {str(e)}")


@router.post("/upload")
async def upload_archive(
    file: UploadFile = File(...),
    printer_id: int | None = None,
    prefer_filename_for_name: bool = Query(
        False,
        description=(
            "Name the archive after the uploaded filename instead of the print_name "
            "embedded in the 3MF's metadata. Off by default, which keeps the embedded "
            "name. Turn it on when the filename you send is the meaningful one — an "
            "integration naming files after its own jobs, or a file whose embedded "
            "title is a stale name from whoever originally sliced it."
        ),
    ),
    db: AsyncSession = Depends(get_db),
    current_user: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_CREATE),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Manually upload a 3MF file to archive.

    prefer_filename_for_name is the same flag the FTP review flow and
    virtual-printer dispatch already pass to ArchiveService.archive_print —
    this endpoint just didn't expose it (#1152 follow-up). Those callers derive
    it from the VP-scoped `virtual_printer_archive_name_source` setting; here it
    is per-request, because the caller is an API client that knows whether the
    filename it sent is the meaningful one (#2609).
    """
    printer_scope.ensure(printer_id)
    if not file.filename or not file.filename.endswith(".3mf"):
        raise HTTPException(400, "File must be a .3mf file")

    # Save uploaded file temporarily — strip directory components to prevent path traversal
    safe_filename = _safe_filename(file.filename)
    temp_path = (
        settings.archive_dir / "temp" / safe_filename
    )  # SEC-PATH-OK: safe_filename = _safe_filename(...) basename-stripped above
    temp_path.parent.mkdir(parents=True, exist_ok=True)

    try:
        content = await file.read()
        # #1401: same content validation as library upload — catches
        # raw-gcode-renamed-to-.3mf and other unprintable shapes before
        # archiving them and offering them up for print.
        from backend.app.api.routes.library import validate_print_file_upload

        validate_print_file_upload(file.filename, content)
        temp_path.write_bytes(content)

        service = ArchiveService(db)
        archive = await service.archive_print(
            printer_id=printer_id,
            source_file=temp_path,
            created_by_id=current_user.id if current_user else None,
            prefer_filename_for_name=prefer_filename_for_name,
        )

        if not archive:
            raise HTTPException(400, "Failed to archive file")

        return ArchiveResponse.model_validate(archive)
    finally:
        if temp_path.exists():
            temp_path.unlink()


@router.post("/upload-bulk")
async def upload_archives_bulk(
    files: list[UploadFile] = File(...),
    printer_id: int | None = None,
    prefer_filename_for_name: bool = Query(
        False,
        description=(
            "Name each archive after its uploaded filename instead of the print_name "
            "embedded in the 3MF's metadata. Applies to every file in the batch. Off "
            "by default, which keeps the embedded name."
        ),
    ),
    db: AsyncSession = Depends(get_db),
    current_user: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_CREATE),
    printer_scope: PrinterScope = RequestPrinterScope,
):
    """Bulk upload multiple 3MF files to archive.

    prefer_filename_for_name applies to every file in the batch. See
    upload_archive for the flag's lineage.
    """
    printer_scope.ensure(printer_id)
    from backend.app.api.routes.library import validate_print_file_upload

    results = []
    errors = []

    for file in files:
        if not file.filename or not file.filename.endswith(".3mf"):
            errors.append({"filename": file.filename or "unknown", "error": "Not a .3mf file"})
            continue

        safe_filename = _safe_filename(file.filename)
        temp_path = (
            settings.archive_dir / "temp" / safe_filename
        )  # SEC-PATH-OK: safe_filename = _safe_filename(...) basename-stripped above
        temp_path.parent.mkdir(parents=True, exist_ok=True)

        try:
            content = await file.read()
            # #1401: bulk-upload variant of the library validation. Collect
            # the rejection per-file rather than aborting the whole batch
            # so one bad file in a 10-file drag-drop doesn't lose the
            # other nine.
            try:
                validate_print_file_upload(file.filename, content)
            except HTTPException as exc:
                errors.append({"filename": file.filename, "error": exc.detail})
                continue
            temp_path.write_bytes(content)

            service = ArchiveService(db)
            archive = await service.archive_print(
                printer_id=printer_id,
                source_file=temp_path,
                created_by_id=current_user.id if current_user else None,
                prefer_filename_for_name=prefer_filename_for_name,
            )

            if archive:
                results.append(
                    {
                        "filename": file.filename,
                        "id": archive.id,
                        "status": "success",
                    }
                )
            else:
                errors.append({"filename": file.filename, "error": "Failed to process"})
        except Exception as e:
            logger.exception("Failed to upload archive %s: %s", file.filename, e)
            errors.append({"filename": file.filename, "error": "Failed to process file"})
        finally:
            if temp_path.exists():
                temp_path.unlink()

    return {
        "uploaded": len(results),
        "failed": len(errors),
        "results": results,
        "errors": errors,
    }


@router.get("/{archive_id}/plates")
async def get_archive_plates(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get available plates from a multi-plate 3MF archive.

    Returns a list of plates with their index, name, thumbnail availability,
    and filament requirements. For single-plate exports, returns a single plate.
    """
    import re

    import defusedxml.ElementTree as ET

    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "Archive file not found")

    plates = []
    # Initialize so the `has_gcode = bool(gcode_files)` after the try/except
    # never raises NameError when the archive isn't a valid zip (e.g. plain
    # .gcode file from a sliced-archive flow that didn't request 3MF output).
    gcode_files: list[str] = []
    # Printer / process preset names the 3MF was prepared with — used by the
    # SliceModal to default its dropdowns (#1325).
    embedded_presets: dict[str, str | None] = {"printer": None, "process": None}
    # Process settings the designer changed away from the stock preset (#2622),
    # offered in the SliceModal for a cross-printer re-slice. Same payload the
    # library plates endpoint returns — SliceModal reads one shape for both.
    design_overrides: list[dict] = []

    try:
        with zipfile.ZipFile(file_path, "r") as zf:
            namelist = zf.namelist()
            embedded_presets = extract_embedded_presets_from_3mf(zf)
            if _PROJECT_SETTINGS_PATH in namelist:
                try:
                    design_overrides = [
                        o._asdict()
                        for o in overrides_from_config(json.loads(zf.read(_PROJECT_SETTINGS_PATH).decode("utf-8")))
                    ]
                except (ValueError, OSError, KeyError):
                    design_overrides = []

            # Find all plate gcode files to determine available plates
            gcode_files = [n for n in namelist if n.startswith("Metadata/plate_") and n.endswith(".gcode")]

            # If no gcode is present (source-only or unsliced), fall back to plate JSON/PNG
            plate_indices: list[int] = []
            if gcode_files:
                # Extract plate indices from gcode filenames
                for gf in gcode_files:
                    # "Metadata/plate_5.gcode" -> 5
                    try:
                        # Remove "Metadata/plate_" and ".gcode"
                        plate_str = gf[15:-6]
                        plate_indices.append(int(plate_str))
                    except ValueError:
                        pass  # Skip gcode file with non-numeric plate index
            else:
                plate_json_files = [n for n in namelist if n.startswith("Metadata/plate_") and n.endswith(".json")]
                plate_png_files = [
                    n
                    for n in namelist
                    if n.startswith("Metadata/plate_")
                    and n.endswith(".png")
                    and "_small" not in n
                    and "no_light" not in n
                ]
                plate_name_candidates = plate_json_files + plate_png_files
                plate_re = re.compile(r"^Metadata/plate_(\d+)\.(json|png)$")
                seen_indices: set[int] = set()
                for name in plate_name_candidates:
                    match = plate_re.match(name)
                    if match:
                        try:
                            index = int(match.group(1))
                        except ValueError:
                            continue
                        if index in seen_indices:
                            continue
                        seen_indices.add(index)
                        plate_indices.append(index)

            if not plate_indices:
                # No plate metadata found
                return {
                    "archive_id": archive_id,
                    "filename": archive.filename,
                    "plates": [],
                    "is_multi_plate": False,
                }

            plate_indices.sort()

            # Parse model_settings.config for plate names + object assignments
            # Plate names are stored with plater_id and plater_name keys
            plate_names = {}  # plater_id -> name
            plate_object_ids: dict[int, list[str]] = {}
            object_names_by_id: dict[str, str] = {}
            if "Metadata/model_settings.config" in namelist:
                try:
                    model_content = zf.read("Metadata/model_settings.config").decode()
                    model_root = ET.fromstring(model_content)
                    # Build object ID -> name map
                    for obj_elem in model_root.findall(".//object"):
                        obj_id = obj_elem.get("id")
                        if not obj_id:
                            continue
                        name_meta = obj_elem.find("metadata[@key='name']")
                        obj_name = name_meta.get("value") if name_meta is not None else None
                        if obj_name:
                            object_names_by_id[obj_id] = obj_name

                    for plate_elem in model_root.findall(".//plate"):
                        plater_id = None
                        plater_name = None
                        for meta in plate_elem.findall("metadata"):
                            key = meta.get("key")
                            value = meta.get("value")
                            if key == "plater_id" and value:
                                try:
                                    plater_id = int(value)
                                except ValueError:
                                    pass  # Skip plate with non-numeric plater_id
                            elif key == "plater_name" and value:
                                plater_name = value.strip()
                        if plater_id is not None and plater_name:
                            plate_names[plater_id] = plater_name

                        if plater_id is not None:
                            for instance_elem in plate_elem.findall("model_instance"):
                                for inst_meta in instance_elem.findall("metadata"):
                                    if inst_meta.get("key") == "object_id":
                                        obj_id = inst_meta.get("value")
                                        if not obj_id:
                                            continue
                                        plate_object_ids.setdefault(plater_id, [])
                                        if obj_id not in plate_object_ids[plater_id]:
                                            plate_object_ids[plater_id].append(obj_id)
                except Exception:
                    pass  # model_settings.config parsing is optional

            # Parse slice_info.config for plate metadata
            plate_metadata = {}  # plate_index -> {filaments, prediction, weight, name, objects}
            if "Metadata/slice_info.config" in namelist:
                content = zf.read("Metadata/slice_info.config").decode()
                root = ET.fromstring(content)

                for plate_elem in root.findall(".//plate"):
                    plate_info = {
                        "filaments": [],
                        "prediction": None,
                        "weight": None,
                        "name": None,
                        "objects": [],
                        "bed_type": None,
                    }

                    # Get plate index from metadata
                    plate_index = None
                    for meta in plate_elem.findall("metadata"):
                        key = meta.get("key")
                        value = meta.get("value")
                        if key == "index" and value:
                            try:
                                plate_index = int(value)
                            except ValueError:
                                pass  # Skip plate with non-numeric index
                        elif key == "prediction" and value:
                            try:
                                plate_info["prediction"] = int(value)
                            except ValueError:
                                pass  # Skip non-numeric print time prediction
                        elif key == "weight" and value:
                            try:
                                plate_info["weight"] = float(value)
                            except ValueError:
                                pass  # Skip non-numeric filament weight
                        elif key == "curr_bed_type" and value:
                            # Per-plate bed type so the PrintModal can show the
                            # right plate alongside each option (#1281).
                            plate_info["bed_type"] = value.strip()

                    # Get filaments used in this plate
                    for filament_elem in plate_elem.findall("filament"):
                        filament_id = filament_elem.get("id")
                        filament_type = filament_elem.get("type", "")
                        filament_color = filament_elem.get("color", "")
                        used_g = filament_elem.get("used_g", "0")
                        used_m = filament_elem.get("used_m", "0")

                        try:
                            used_grams = float(used_g)
                        except (ValueError, TypeError):
                            used_grams = 0

                        if used_grams > 0 and filament_id:
                            plate_info["filaments"].append(
                                {
                                    "slot_id": int(filament_id),
                                    "type": filament_type,
                                    "color": filament_color,
                                    "used_grams": round(used_grams, 1),
                                    "used_meters": float(used_m) if used_m else 0,
                                }
                            )

                    # Sort filaments by slot ID
                    plate_info["filaments"].sort(key=lambda x: x["slot_id"])

                    # Collect all object names on this plate
                    for obj_elem in plate_elem.findall("object"):
                        obj_name = obj_elem.get("name")
                        if obj_name and obj_name not in plate_info["objects"]:
                            plate_info["objects"].append(obj_name)

                    # Set plate name: prefer custom name from model_settings.config,
                    # fall back to first object name if no custom name was set
                    if plate_index is not None:
                        custom_name = plate_names.get(plate_index)
                        if custom_name:
                            plate_info["name"] = custom_name
                        else:
                            # Fall back to first object name as hint
                            if plate_info["objects"]:
                                plate_info["name"] = plate_info["objects"][0]

                        plate_metadata[plate_index] = plate_info

            # Parse plate_*.json for object lists when slice_info is missing
            plate_json_objects: dict[int, list[str]] = {}
            for name in namelist:
                match = re.match(r"^Metadata/plate_(\d+)\.json$", name)
                if not match:
                    continue
                try:
                    plate_index = int(match.group(1))
                except ValueError:
                    continue
                try:
                    payload = json.loads(zf.read(name).decode())
                    bbox_objects = payload.get("bbox_objects", [])
                    names = []
                    for obj in bbox_objects:
                        obj_name = obj.get("name") if isinstance(obj, dict) else None
                        if obj_name and obj_name not in names:
                            names.append(obj_name)
                    if names:
                        plate_json_objects[plate_index] = names
                except Exception:
                    continue

            # Build plate list
            for idx in plate_indices:
                meta = plate_metadata.get(idx, {})
                has_thumbnail = f"Metadata/plate_{idx}.png" in namelist
                objects = meta.get("objects", [])
                if not objects:
                    objects = plate_json_objects.get(idx, [])
                if not objects and plate_object_ids.get(idx):
                    objects = [
                        object_names_by_id.get(obj_id, f"Object {obj_id}") for obj_id in plate_object_ids.get(idx, [])
                    ]

                plate_name = meta.get("name")
                if not plate_name:
                    plate_name = plate_names.get(idx)
                if not plate_name and objects:
                    plate_name = objects[0]

                plates.append(
                    {
                        "index": idx,
                        "name": plate_name,
                        "objects": objects,
                        "object_count": len(objects),
                        "has_thumbnail": has_thumbnail,
                        "thumbnail_url": f"/api/v1/archives/{archive_id}/plate-thumbnail/{idx}"
                        if has_thumbnail
                        else None,
                        "print_time_seconds": meta.get("prediction"),
                        "filament_used_grams": meta.get("weight"),
                        "filaments": meta.get("filaments", []),
                        "bed_type": meta.get("bed_type"),
                    }
                )

    except Exception as e:
        logger.warning("Failed to parse plates from archive %s: %s", archive_id, e)

    # Has gcode iff the plate list was built from .gcode filenames (as opposed
    # to the JSON/PNG fallback for source-only 3MF projects). Callers that need
    # to preview gcode — the viewer, skip-objects — can gate on this instead of
    # 404-ing on every plate request.
    has_gcode = bool(gcode_files)
    return {
        "archive_id": archive_id,
        "filename": archive.filename,
        "plates": plates,
        "is_multi_plate": len(plates) > 1,
        "has_gcode": has_gcode,
        "embedded_printer": embedded_presets["printer"],
        "embedded_process": embedded_presets["process"],
        "design_overrides": design_overrides,
    }


@router.get("/{archive_id}/plate-thumbnail/{plate_index}")
async def get_plate_thumbnail(
    archive_id: int,
    plate_index: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_media_token_ownership(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get the thumbnail image for a specific plate.

    Requires a media token query param (?token=xxx) when auth is enabled, and
    returns 404 for an archive the caller may not read (#3025).
    """
    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "Archive file not found")

    try:
        with zipfile.ZipFile(file_path, "r") as zf:
            thumb_path = f"Metadata/plate_{plate_index}.png"
            if thumb_path in zf.namelist():
                data = zf.read(thumb_path)
                return Response(content=data, media_type="image/png")
    except Exception:
        pass  # Fall through to 404 if archive is unreadable or thumbnail missing

    raise HTTPException(404, f"Thumbnail for plate {plate_index} not found")


async def _try_preview_slice_filaments(
    db: AsyncSession,
    *,
    kind: str,
    source_id: int,
    plate_id: int,
    file_path: Path,
    request_id: str | None = None,
) -> list[dict] | None:
    """Run a preview slice via the user's configured sidecar so the filament
    list endpoint can return real per-plate filaments for unsliced project
    files. Returns ``None`` on any failure — the caller falls back to the
    painted-face heuristic. ``request_id`` flows through to the sidecar
    for live progress on the SliceModal's inline spinner + toast.
    """
    from backend.app.api.routes.settings import get_setting
    from backend.app.services.slice_preview import get_preview_filaments
    from backend.app.services.slicer_api import get_stall_timeout_seconds

    preferred = (await get_setting(db, "preferred_slicer")) or "bambu_studio"
    if preferred == "orcaslicer":
        configured = await get_setting(db, "orcaslicer_api_url")
        api_url = (configured or settings.slicer_api_url).strip()
    elif preferred == "bambu_studio":
        configured = await get_setting(db, "bambu_studio_api_url")
        api_url = (configured or settings.bambu_studio_api_url).strip()
    else:
        return None
    if not api_url:
        return None

    try:
        file_bytes = file_path.read_bytes()
    except OSError:
        return None
    return await get_preview_filaments(
        kind=kind,
        source_id=source_id,
        plate_id=plate_id,
        file_bytes=file_bytes,
        file_name=file_path.name,
        api_url=api_url,
        request_id=request_id,
        timeout_seconds=await get_stall_timeout_seconds(db),
    )


@router.get("/{archive_id}/filament-requirements")
async def get_filament_requirements(
    archive_id: int,
    plate_id: int | None = None,
    request_id: str | None = None,
    full_slots: bool = False,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get filament requirements from the archived 3MF file.

    Returns the filaments used in this print with their slot IDs, types, colors,
    and usage amounts. This can be compared with current AMS state before reprinting.

    Args:
        archive_id: The archive ID
        plate_id: Optional plate index to filter filaments for (for multi-plate files)
    """
    import defusedxml.ElementTree as ET

    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "Archive file not found")

    filaments = []

    try:
        with zipfile.ZipFile(file_path, "r") as zf:
            # Parse slice_info.config for filament requirements
            if "Metadata/slice_info.config" in zf.namelist():
                content = zf.read("Metadata/slice_info.config").decode()
                root = ET.fromstring(content)

                # If plate_id is specified, find filaments for that specific plate
                if plate_id is not None:
                    # Find the plate element with matching index
                    for plate_elem in root.findall(".//plate"):
                        plate_index = None
                        for meta in plate_elem.findall("metadata"):
                            if meta.get("key") == "index":
                                try:
                                    plate_index = int(meta.get("value", "0"))
                                except ValueError:
                                    pass  # Skip plate with non-numeric index metadata
                                break

                        if plate_index == plate_id:
                            # Extract filaments from this plate element
                            for filament_elem in plate_elem.findall("filament"):
                                filament_id = filament_elem.get("id")
                                filament_type = filament_elem.get("type", "")
                                filament_color = filament_elem.get("color", "")
                                used_g = filament_elem.get("used_g", "0")
                                used_m = filament_elem.get("used_m", "0")

                                tray_info_idx = filament_elem.get("tray_info_idx", "")

                                try:
                                    used_grams = float(used_g)
                                except (ValueError, TypeError):
                                    used_grams = 0

                                if used_grams > 0 and filament_id:
                                    filaments.append(
                                        {
                                            "slot_id": int(filament_id),
                                            "type": filament_type,
                                            "color": filament_color,
                                            "used_grams": round(used_grams, 1),
                                            "used_meters": float(used_m) if used_m else 0,
                                            "tray_info_idx": tray_info_idx,
                                            "used_in_plate": True,
                                        }
                                    )
                            break
                else:
                    # No plate_id specified - extract all filaments with used_g > 0
                    # This is the legacy behavior for single-plate files
                    for filament_elem in root.findall(".//filament"):
                        filament_id = filament_elem.get("id")
                        filament_type = filament_elem.get("type", "")
                        filament_color = filament_elem.get("color", "")
                        used_g = filament_elem.get("used_g", "0")
                        used_m = filament_elem.get("used_m", "0")

                        tray_info_idx = filament_elem.get("tray_info_idx", "")

                        # Only include filaments that are actually used
                        try:
                            used_grams = float(used_g)
                        except (ValueError, TypeError):
                            used_grams = 0

                        if used_grams > 0 and filament_id:
                            filaments.append(
                                {
                                    "slot_id": int(filament_id),
                                    "type": filament_type,
                                    "color": filament_color,
                                    "used_grams": round(used_grams, 1),
                                    "used_meters": float(used_m) if used_m else 0,
                                    "tray_info_idx": tray_info_idx,
                                    "used_in_plate": True,
                                }
                            )

            # Re-slicing a source that already carries slice_info (#2712).
            # See library.py for the full rationale: the slice modal's list is
            # positional, so a source using only slot 4 must still present
            # four slots or the pick lands on slot 1. The print path keeps the
            # used-only list it depends on.
            if full_slots and filaments:
                filaments = expand_to_project_slots(zf, filaments)

            # Unsliced project files: see library.py for full rationale.
            # Return the FULL project_settings.config slot list with a
            # used_in_plate flag derived from the preview slice; the
            # CLI needs every slot pre-filled to avoid silent default
            # substitution.
            if not filaments:
                project_filaments = extract_project_filaments_from_3mf(zf)
                used_slot_ids: set[int] = set()
                if project_filaments and plate_id is not None:
                    preview = await _try_preview_slice_filaments(
                        db,
                        kind="archive",
                        source_id=archive_id,
                        plate_id=plate_id,
                        file_path=file_path,
                        request_id=request_id,
                    )
                    if preview is not None:
                        used_slot_ids = {f["slot_id"] for f in preview}
                fallback_all_used = not used_slot_ids
                for f in project_filaments:
                    f["used_in_plate"] = fallback_all_used or f["slot_id"] in used_slot_ids
                filaments = project_filaments

            # Sort by slot ID
            filaments.sort(key=lambda x: x["slot_id"])

            # Enrich with nozzle mapping for dual-nozzle printers
            nozzle_mapping = extract_nozzle_mapping_from_3mf(zf)
            if nozzle_mapping:
                for filament in filaments:
                    filament["nozzle_id"] = nozzle_mapping.get(filament["slot_id"])

            # Nozzle-rack machines (#1784): the print dialog offers a rack
            # position per filament group, which needs the group table as well
            # as the carriage above.
            annotate_rack_groups(filaments, file_path, plate_id)

    except Exception as e:
        logger.warning("Failed to parse filament requirements from archive %s: %s", archive_id, e)

    return {
        "archive_id": archive_id,
        "filename": archive.filename,
        "plate_id": plate_id,
        "filaments": filaments,
    }


@router.post("/{archive_id}/slice", status_code=202)
async def slice_archive(
    archive_id: int,
    request: SliceRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User | None = RequirePermissionIfAuthEnabled(Permission.LIBRARY_UPLOAD),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Enqueue a slice job for an archive's source. Returns 202 + job_id;
    the slice runs in the background, the caller polls `GET /slice-jobs/{id}`.

    Source preference: ``source_3mf_path`` (the un-sliced project file the
    user originally sent to slice) → ``file_path`` (the sliced 3MF/gcode that
    actually printed).
    """
    from backend.app.api.routes.library import guard_nozzle_class_reslice, slice_and_persist_as_archive
    from backend.app.core.database import async_session
    from backend.app.services.slice_dispatch import (
        http_exception_to_job_error,
        slice_dispatch,
    )

    archive = await db.get(PrintArchive, archive_id)
    # Per-row ownership gate — mirror the archive read routes. LIBRARY_UPLOAD
    # alone let a READ_OWN caller slice another user's archive by raw id even
    # though GET on that id returned 404. API-key / auth-disabled callers
    # (current_user is None) keep can_read_all=True — no per-row identity.
    can_read_all = current_user is None or current_user.has_permission(Permission.ARCHIVES_READ_ALL.value)
    archive = _ensure_archive_visible(archive, current_user, can_read_all, printer_scope)

    src_relative = archive.source_3mf_path or archive.file_path
    if not src_relative:
        raise HTTPException(
            status_code=400,
            detail="Archive has no source file to slice",
        )

    src_path = (
        Path(settings.base_dir) / src_relative
    )  # SEC-PATH-OK: src_relative is archive.source_3mf_path from DB, set by _resolve_source_3mf_path which already does resolve+relative_to containment
    if not src_path.exists():
        raise HTTPException(status_code=404, detail="Archive source file missing on disk")

    raw_filename = archive.filename or src_path.name
    src_lower = raw_filename.lower()
    if not (
        src_lower.endswith(".stl")
        or src_lower.endswith(".3mf")
        or src_lower.endswith(".step")
        or src_lower.endswith(".stp")
    ):
        raise HTTPException(
            status_code=400,
            detail="Archive's source file must be STL, 3MF, or STEP to slice",
        )

    # Match the library route: derive the sliced output's filename from
    # `print_name` when set, so the new archive row's display name lines
    # up with the source's display.
    src_ext = Path(raw_filename).suffix.lower() or ".3mf"
    src_filename = (
        f"{archive.print_name.strip()}{src_ext}" if archive.print_name and archive.print_name.strip() else raw_filename
    )

    model_bytes = src_path.read_bytes()
    archive_id_local = archive.id
    user_id = current_user.id if current_user else None

    # Block a cross-nozzle-class re-slice (single-nozzle <-> H2D) up front —
    # BambuStudio's multi-extruder validator would otherwise reject it with a
    # cryptic error. No-op for same-class or un-sliced sources.
    await guard_nozzle_class_reslice(db, current_user, request, archive.sliced_for_model)

    async def _run(job_id: int):
        async with async_session() as task_db:
            # Re-fetch the source archive on the background-task session.
            src_archive = await task_db.get(PrintArchive, archive_id_local)
            if src_archive is None:
                raise http_exception_to_job_error(
                    HTTPException(status_code=404, detail="Archive disappeared during slice")
                )
            try:
                response = await slice_and_persist_as_archive(
                    task_db,
                    model_bytes=model_bytes,
                    model_filename=src_filename,
                    request=request,
                    source_archive=src_archive,
                    current_user_id=user_id,
                    job_id=job_id,
                )
            except HTTPException as exc:
                raise http_exception_to_job_error(exc) from exc
        return response.model_dump()

    job = await slice_dispatch.enqueue(
        kind="archive",
        source_id=archive.id,
        source_name=archive.print_name or archive.filename or f"archive {archive.id}",
        owner_id=user_id,
        run=_run,
    )
    return {
        "job_id": job.id,
        "status": job.status,
        "status_url": f"/api/v1/slice-jobs/{job.id}",
    }


@router.post("/{archive_id}/reprint")
async def reprint_archive(
    archive_id: int,
    printer_id: int,
    # SECURITY.md SEC-AUTH-1: every route either has an explicit auth dep or
    # is in the route-auth-coverage allowlist. Gating the deprecation stub on
    # QUEUE_CREATE matches the replacement route (POST /queue/) and means
    # anonymous callers bounce at auth instead of seeing the deprecation
    # message — leaking "this route exists" to unauthenticated callers is
    # exactly the shape the backstop guards against.
    _: User | None = RequirePermissionIfAuthEnabled(Permission.QUEUE_CREATE),
):
    """Legacy direct reprint endpoint. Use POST /queue/ instead."""
    logger.warning(
        "Gone API used: POST /archives/%s/reprint?printer_id=%s; use POST /queue/ instead",
        archive_id,
        printer_id,
    )
    raise HTTPException(
        status_code=410,
        detail="Direct archive reprint has been removed. Create a print queue item with POST /queue/.",
    )


# =============================================================================
# Project Page API
# =============================================================================


@router.get("/{archive_id}/project-page")
async def get_project_page(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get the project page data from the 3MF file."""
    from backend.app.schemas.archive import ProjectPageResponse
    from backend.app.services.archive import ProjectPageParser

    user, can_read_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "Archive file not found")

    parser = ProjectPageParser(file_path)
    data = parser.parse(archive_id)

    return ProjectPageResponse(**data)


@router.patch("/{archive_id}/project-page")
async def update_project_page(
    archive_id: int,
    update_data: dict,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_UPDATE_ALL,
            Permission.ARCHIVES_UPDATE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Update project page metadata in the 3MF file."""
    from backend.app.services.archive import ProjectPageParser

    user, can_modify_all = auth_result
    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_modify_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "Archive file not found")

    parser = ProjectPageParser(file_path)
    success = parser.update_metadata(update_data)

    if not success:
        raise HTTPException(500, "Failed to update project page")

    # Return updated data
    data = parser.parse(archive_id)
    return data


@router.get("/{archive_id}/project-image/{image_path:path}")
async def get_project_image(
    archive_id: int,
    image_path: str,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_media_token_ownership(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Get an image from the 3MF project page.

    Requires a media token query param (?token=xxx) when auth is enabled, and
    returns 404 for an archive the caller may not read (#3025).
    """
    user, can_read_all = auth_result
    from backend.app.services.archive import ProjectPageParser

    service = ArchiveService(db)
    archive = _ensure_archive_visible(await service.get_archive(archive_id), user, can_read_all, printer_scope)

    file_path = settings.base_dir / archive.file_path
    if not file_path.is_file():
        raise HTTPException(404, "Archive file not found")

    parser = ProjectPageParser(file_path)
    result = parser.get_image(image_path)

    if not result:
        raise HTTPException(404, "Image not found in 3MF file")

    image_data, content_type = result
    return Response(
        content=image_data,
        media_type=content_type,
        headers={"Cache-Control": "max-age=3600"},
    )


# =============================================================================
# Source 3MF API (Original Project Files)
# =============================================================================


def _resolve_source_3mf_path(archive: PrintArchive, source_filename: str) -> Path:
    """Resolve where to write a source 3MF for ``archive``.

    Normal archives nest the source under ``<archive_file_dir>/source/``.
    "Fallback" archives (created in main.py when MQTT reports a print start
    but Bambuddy never saw the source 3MF — cloud / Handy / pre-existing
    SD-card prints) carry ``file_path=""``. Joining that with ``base_dir``
    via the ``/`` operator silently yields ``base_dir`` itself, whose parent
    is ``base_dir.parent`` — which sent the upload to ``/app/source/`` and
    raised a 500 on the final ``relative_to`` (#1531). Fallback archives
    now land under ``<base_dir>/archive/no_source/<archive_id>/`` instead,
    which stays inside the data volume and remains addressable by every
    read site that does ``base_dir / archive.source_3mf_path``.

    The resolved directory is asserted to be inside ``base_dir`` even when
    ``archive.file_path`` is populated, so a row corrupted by an old import
    or manual SQL edit fails with a clear 500 instead of writing outside
    the data volume.
    """
    if archive.file_path:
        archive_file = settings.base_dir / archive.file_path
        source_dir = archive_file.parent / "source"
    else:
        source_dir = settings.base_dir / "archive" / "no_source" / str(archive.id)

    # Containment check via resolve() — catches absolute file_path, `..`
    # traversal, and any other shape that escapes the data volume — but we
    # return the *literal* source_dir below. Resolving the returned path
    # would canonicalise away a symlinked DATA_DIR (legitimate on TrueNAS /
    # QNAP / Synology storage pools, and any `-v /symlink:/app/data`
    # mount), which would then make the caller's
    # ``source_path.relative_to(settings.base_dir)`` raise because the
    # left side is canonical and the right is the symlink path.
    try:
        source_dir.resolve().relative_to(settings.base_dir.resolve())
    except ValueError as exc:
        raise HTTPException(
            500,
            f"Archive {archive.id} resolves to a path outside the data directory; cannot attach source.",
        ) from exc

    source_dir.mkdir(parents=True, exist_ok=True)
    return (
        source_dir / source_filename
    )  # SEC-PATH-OK: callers pass _safe_filename(...) basename-stripped; source_dir resolve+relative_to checked above


@router.post("/{archive_id}/source")
async def upload_source_3mf(
    archive_id: int,
    file: UploadFile = File(...),
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_UPDATE_ALL,
            Permission.ARCHIVES_UPDATE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Upload the original source 3MF project file for an archive."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    if not file.filename or not file.filename.endswith(".3mf"):
        raise HTTPException(400, "File must be a .3mf file")

    # Save the source 3MF file - preserve original filename, strip directory components
    source_filename = _safe_filename(file.filename)
    source_path = _resolve_source_3mf_path(archive, source_filename)

    # Delete old source file if exists
    if archive.source_3mf_path:
        old_source_path = settings.base_dir / archive.source_3mf_path
        if old_source_path.exists():
            old_source_path.unlink()

    content = await file.read()
    # #1401: validate zip header on source 3MF uploads too — source files
    # are uploaded for reprint and slicing, so an invalid one breaks the
    # same downstream paths as a bad sliced file.
    from backend.app.api.routes.library import validate_print_file_upload

    validate_print_file_upload(file.filename, content)
    source_path.write_bytes(content)

    # Update archive with source path (relative to base_dir)
    archive.source_3mf_path = str(source_path.relative_to(settings.base_dir))

    await db.commit()
    await db.refresh(archive)

    return {
        "status": "uploaded",
        "source_3mf_path": archive.source_3mf_path,
        "filename": source_filename,
    }


@router.get("/{archive_id}/source")
async def download_source_3mf(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Download the source 3MF project file."""
    user, can_read_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_read_all, printer_scope)

    if not archive.source_3mf_path:
        raise HTTPException(404, "No source 3MF attached to this archive")

    source_path = settings.base_dir / archive.source_3mf_path
    if not source_path.exists():
        raise HTTPException(404, "Source 3MF file not found on disk")

    # Use the actual filename from the path
    filename = source_path.name

    return FileResponse(
        path=source_path,
        filename=filename,
        media_type="application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
    )


@router.get("/{archive_id}/source/{filename}")
async def download_source_3mf_for_slicer(
    archive_id: int,
    filename: str,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Download source 3MF with filename in URL."""
    user, can_read_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_read_all, printer_scope)

    if not archive.source_3mf_path:
        raise HTTPException(404, "No source 3MF attached to this archive")

    source_path = settings.base_dir / archive.source_3mf_path
    if not source_path.exists():
        raise HTTPException(404, "Source 3MF file not found on disk")

    return FileResponse(
        path=source_path,
        filename=filename if filename.endswith(".3mf") else f"{filename}.3mf",
        media_type="application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
    )


@router.post("/{archive_id}/source-slicer-token")
async def create_source_slicer_token(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Create a short-lived download token for opening source 3MF in slicer."""
    from backend.app.core.auth import create_slicer_download_token

    user, can_read_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_read_all, printer_scope)
    if not archive.source_3mf_path:
        raise HTTPException(404, "No source 3MF attached to this archive")

    token = await create_slicer_download_token("source", archive_id)
    return {"token": token}


@router.get("/{archive_id}/source-dl/{token}/{filename}")
async def download_source_3mf_for_slicer_with_token(
    archive_id: int,
    token: str,
    filename: str,
    db: AsyncSession = Depends(get_db),
):
    """Download source 3MF using a slicer download token.

    Token-authenticated (no auth headers needed). The token is short-lived and
    archive-bound, created by POST /{archive_id}/source-slicer-token, and
    redeemable for the rest of its TTL rather than exactly once (#3029).
    """
    from backend.app.core.auth import verify_slicer_download_token

    if not await verify_slicer_download_token(token, "source", archive_id, single_use=False):
        raise HTTPException(403, "Invalid or expired download token")

    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = result.scalar_one_or_none()
    if not archive:
        raise HTTPException(404, "Archive not found")

    if not archive.source_3mf_path:
        raise HTTPException(404, "No source 3MF attached to this archive")

    source_path = settings.base_dir / archive.source_3mf_path
    if not source_path.exists():
        raise HTTPException(404, "Source 3MF file not found on disk")

    return FileResponse(
        path=source_path,
        filename=filename if filename.endswith(".3mf") else f"{filename}.3mf",
        media_type="application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
    )


@router.post("/upload-source")
async def upload_source_3mf_by_name(
    file: UploadFile = File(...),
    print_name: str = Query(None, description="Match archive by print name"),
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.ARCHIVES_UPDATE_ALL),
):
    """Upload source 3MF and match to archive by print name.

    This endpoint is designed for slicer post-processing scripts.
    It finds the most recent archive matching the print name and attaches the source.
    """
    if not file.filename or not file.filename.endswith(".3mf"):
        raise HTTPException(400, "File must be a .3mf file")

    safe_filename = _safe_filename(file.filename)

    # Derive print name from filename if not provided
    if not print_name:
        # Remove .3mf extension and common suffixes
        print_name = safe_filename.rsplit(".3mf", 1)[0]
        # Remove _source suffix if present
        if print_name.endswith("_source"):
            print_name = print_name[:-7]

    # Find matching archive - try exact match first, then fuzzy
    result = await db.execute(
        select(PrintArchive)
        .where(PrintArchive.print_name == print_name)
        .order_by(PrintArchive.created_at.desc())
        .limit(1)
    )
    archive = result.scalar_one_or_none()

    if not archive:
        # Try matching filename without .gcode.3mf
        result = await db.execute(
            select(PrintArchive)
            .where(PrintArchive.filename.like(f"{print_name}%"))
            .order_by(PrintArchive.created_at.desc())
            .limit(1)
        )
        archive = result.scalar_one_or_none()

    if not archive:
        # Try case-insensitive partial match on print_name
        result = await db.execute(
            select(PrintArchive)
            .where(PrintArchive.print_name.ilike(f"%{print_name}%"))
            .order_by(PrintArchive.created_at.desc())
            .limit(1)
        )
        archive = result.scalar_one_or_none()

    if not archive:
        raise HTTPException(404, f"No archive found matching '{print_name}'")

    # Save the source 3MF file - preserve original filename, strip directory components
    source_filename = safe_filename
    source_path = _resolve_source_3mf_path(archive, source_filename)

    # Delete old source file if exists
    if archive.source_3mf_path:
        old_source_path = settings.base_dir / archive.source_3mf_path
        if old_source_path.exists():
            old_source_path.unlink()

    content = await file.read()
    # #1401: same zip-header check as the other upload routes — the
    # match-by-name endpoint is used by slicer post-processing scripts,
    # so a misconfigured script is exactly how a bad 3MF would slip in.
    from backend.app.api.routes.library import validate_print_file_upload

    validate_print_file_upload(file.filename, content)
    source_path.write_bytes(content)

    # Update archive with source path
    archive.source_3mf_path = str(source_path.relative_to(settings.base_dir))
    await db.commit()
    await db.refresh(archive)

    return {
        "status": "uploaded",
        "archive_id": archive.id,
        "archive_name": archive.print_name or archive.filename,
        "source_3mf_path": archive.source_3mf_path,
        "filename": source_filename,
    }


@router.delete("/{archive_id}/source")
async def delete_source_3mf(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_DELETE_ALL,
            Permission.ARCHIVES_DELETE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Delete the source 3MF project file from an archive."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    if not archive.source_3mf_path:
        raise HTTPException(404, "No source 3MF attached to this archive")

    # Delete the file
    source_path = settings.base_dir / archive.source_3mf_path
    if source_path.exists():
        source_path.unlink()

    # Clear the path in database
    archive.source_3mf_path = None
    await db.commit()

    return {"status": "deleted"}


# =============================================================================
# F3D API (Fusion 360 Design Files)
# =============================================================================


@router.post("/{archive_id}/f3d")
async def upload_f3d(
    archive_id: int,
    file: UploadFile = File(...),
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_UPDATE_ALL,
            Permission.ARCHIVES_UPDATE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Upload a Fusion 360 design file for an archive."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    if not file.filename or not file.filename.endswith(".f3d"):
        raise HTTPException(400, "File must be a .f3d file")

    # Get archive directory and create f3d subdirectory
    file_path = settings.base_dir / archive.file_path
    archive_dir = file_path.parent
    f3d_dir = archive_dir / "f3d"
    f3d_dir.mkdir(exist_ok=True)

    # Delete old F3D file if exists
    if archive.f3d_path:
        old_f3d_path = settings.base_dir / archive.f3d_path
        if old_f3d_path.exists():
            old_f3d_path.unlink()

    # Save the F3D file - preserve original filename, strip directory components
    f3d_filename = _safe_filename(file.filename)
    f3d_path = f3d_dir / f3d_filename  # SEC-PATH-OK: f3d_filename = _safe_filename(...) basename-stripped above

    content = await file.read()
    f3d_path.write_bytes(content)

    # Update archive with F3D path (relative to base_dir)
    archive.f3d_path = str(f3d_path.relative_to(settings.base_dir))

    await db.commit()
    await db.refresh(archive)

    return {
        "status": "uploaded",
        "f3d_path": archive.f3d_path,
        "filename": f3d_filename,
    }


@router.get("/{archive_id}/f3d")
async def download_f3d(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_READ_ALL,
            Permission.ARCHIVES_READ_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Download the Fusion 360 design file."""
    user, can_read_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_read_all, printer_scope)

    if not archive.f3d_path:
        raise HTTPException(404, "No F3D file attached to this archive")

    f3d_path = settings.base_dir / archive.f3d_path
    if not f3d_path.exists():
        raise HTTPException(404, "F3D file not found on disk")

    # Use the actual filename from the path
    filename = f3d_path.name

    return FileResponse(
        path=f3d_path,
        filename=filename,
        media_type="application/octet-stream",
    )


@router.delete("/{archive_id}/f3d")
async def delete_f3d(
    archive_id: int,
    db: AsyncSession = Depends(get_db),
    auth_result: tuple[User | None, bool] = Depends(
        require_ownership_permission(
            Permission.ARCHIVES_DELETE_ALL,
            Permission.ARCHIVES_DELETE_OWN,
        )
    ),
    printer_scope: PrinterScope = MediaOrRequestPrinterScope,
):
    """Delete the Fusion 360 design file from an archive."""
    user, can_modify_all = auth_result
    result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
    archive = _ensure_archive_visible(result.scalar_one_or_none(), user, can_modify_all, printer_scope)

    if not archive.f3d_path:
        raise HTTPException(404, "No F3D file attached to this archive")

    # Delete the file
    f3d_path = settings.base_dir / archive.f3d_path
    if f3d_path.exists():
        f3d_path.unlink()

    # Clear the path in database
    archive.f3d_path = None
    await db.commit()

    return {"status": "deleted"}