import io
import json
import logging
import os
import uuid
import zipfile
from datetime import datetime
from pathlib import Path

from fastapi import APIRouter, Depends, File, HTTPException, UploadFile
from fastapi.responses import FileResponse, StreamingResponse
from sqlalchemy import case, func, select
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.orm import selectinload

from backend.app.api.routes.library import get_library_dir
from backend.app.core.auth import RequireCameraStreamTokenIfAuthEnabled, RequirePermissionIfAuthEnabled
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.models.archive import PrintArchive
from backend.app.models.library import LibraryFile, LibraryFolder
from backend.app.models.print_log import PrintLogEntry
from backend.app.models.print_queue import PrintQueueItem
from backend.app.models.project import Project
from backend.app.models.project_bom import ProjectBOMItem
from backend.app.models.user import User
from backend.app.schemas.project import (
    ArchivePreview,
    BatchAddArchives,
    BatchAddQueueItems,
    BOMItemCreate,
    BOMItemResponse,
    BOMItemUpdate,
    ProjectChildPreview,
    ProjectCreate,
    ProjectImport,
    ProjectListResponse,
    ProjectResponse,
    ProjectStats,
    ProjectUpdate,
    TimelineEvent,
)
from backend.app.utils.http import build_content_disposition
from backend.app.utils.safe_path import safe_join_under

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/projects", tags=["projects"])


_FAILURE_STATUSES = ("failed", "aborted", "cancelled", "stopped")


async def compute_project_stats(
    db: AsyncSession, project_id: int, target_count: int | None = None, target_parts_count: int | None = None
) -> ProjectStats:
    """Compute statistics for a project.

    Aggregates from ``print_log_entries`` joined to ``print_archives`` so
    every actual run contributes — pre-fix this counted ``print_archives``
    (one row per file), which under-reported every reprint by collapsing
    runs back into the source file (#1593). The Archive Print Log view
    already drives off the same source (``archives.py::list_archives_slim``),
    so project stats now stay aligned with the per-archive numbers.

    Orphan log entries (``archive_id IS NULL`` after archive deletion via
    ``ON DELETE SET NULL``) are excluded by the inner join — they can't
    be attributed to a project.
    """
    # Per-run aggregates from print_log_entries joined on archive_id so
    # the WHERE filters by archives.project_id. Each run's duration,
    # filament, cost, and energy come from the log row, not the source
    # archive — so multi-plate 3MFs and reprints both count correctly.
    log_stats_result = await db.execute(
        select(
            func.count(PrintLogEntry.id).label("total_runs"),
            func.coalesce(func.sum(PrintLogEntry.duration_seconds), 0).label("total_time"),
            func.coalesce(func.sum(PrintLogEntry.filament_used_grams), 0).label("total_filament"),
            func.coalesce(func.sum(PrintLogEntry.cost), 0).label("total_filament_cost"),
            func.coalesce(func.sum(PrintLogEntry.energy_kwh), 0).label("total_energy"),
            func.coalesce(func.sum(PrintLogEntry.energy_cost), 0).label("total_energy_cost"),
        )
        .join(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
        .where(PrintArchive.project_id == project_id)
    )
    log_stats = log_stats_result.first()
    total_archives = int(log_stats.total_runs or 0)

    # Total items the project has produced or attempted: sum of quantity
    # per run (each run contributes its archive's quantity). The total/
    # completed/failed splits are all per-run, not per-file.
    items_split_result = await db.execute(
        select(
            func.coalesce(func.sum(PrintArchive.quantity), 0).label("total_items"),
            func.coalesce(
                func.sum(case((PrintLogEntry.status == "completed", PrintArchive.quantity), else_=0)),
                0,
            ).label("completed_items"),
            func.coalesce(
                func.sum(case((PrintLogEntry.status.in_(_FAILURE_STATUSES), 1), else_=0)),
                0,
            ).label("failed_runs"),
        )
        .join(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
        .where(PrintArchive.project_id == project_id)
    )
    items_split = items_split_result.first()
    total_items = int(items_split.total_items or 0)
    completed_items = int(items_split.completed_items or 0)
    failed_prints = int(items_split.failed_runs or 0)

    # Count queued items
    queued_result = await db.execute(
        select(func.count(PrintQueueItem.id)).where(
            PrintQueueItem.project_id == project_id, PrintQueueItem.status == "pending"
        )
    )
    queued_prints = queued_result.scalar() or 0

    # Count in-progress items
    in_progress_result = await db.execute(
        select(func.count(PrintQueueItem.id)).where(
            PrintQueueItem.project_id == project_id, PrintQueueItem.status == "printing"
        )
    )
    in_progress_prints = in_progress_result.scalar() or 0

    # Calculate progress for plates (target_count vs total_archives)
    progress_percent = None
    remaining_prints = None
    if target_count and target_count > 0:
        progress_percent = round((total_archives / target_count) * 100, 1)
        remaining_prints = max(0, target_count - total_archives)

    # Calculate progress for parts (target_parts_count vs completed_items)
    parts_progress_percent = None
    remaining_parts = None
    if target_parts_count and target_parts_count > 0:
        parts_progress_percent = round((completed_items / target_parts_count) * 100, 1)
        remaining_parts = max(0, target_parts_count - completed_items)

    # BOM stats
    bom_result = await db.execute(
        select(
            func.count(ProjectBOMItem.id).label("total"),
            func.sum(case((ProjectBOMItem.quantity_acquired >= ProjectBOMItem.quantity_needed, 1), else_=0)).label(
                "completed"
            ),
            func.coalesce(func.sum(ProjectBOMItem.unit_price * ProjectBOMItem.quantity_needed), 0).label("bom_cost"),
        ).where(ProjectBOMItem.project_id == project_id)
    )
    bom_stats = bom_result.first()

    return ProjectStats(
        total_archives=total_archives,
        total_items=int(total_items),
        completed_prints=completed_items,  # Now reflects sum of quantities for completed prints
        failed_prints=int(failed_prints),
        queued_prints=queued_prints,
        in_progress_prints=in_progress_prints,
        total_print_time_hours=round((log_stats.total_time or 0) / 3600, 2),
        total_filament_grams=round(log_stats.total_filament or 0, 2),
        progress_percent=progress_percent,
        parts_progress_percent=parts_progress_percent,
        estimated_cost=round((log_stats.total_filament_cost or 0), 2),
        total_energy_kwh=round((log_stats.total_energy or 0), 3),
        total_energy_cost=round((log_stats.total_energy_cost or 0), 3),
        remaining_prints=remaining_prints,
        remaining_parts=remaining_parts,
        bom_total_items=bom_stats.total or 0,
        bom_completed_items=int(bom_stats.completed or 0),
        bom_cost=round(float(bom_stats.bom_cost or 0), 2),
    )


@router.get("", response_model=list[ProjectListResponse])
@router.get("/", response_model=list[ProjectListResponse])
async def list_projects(
    status: str | None = None,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """List all projects with basic stats."""
    query = select(Project)
    if status:
        query = query.where(Project.status == status)
    query = query.order_by(Project.updated_at.desc())

    result = await db.execute(query)
    projects = result.scalars().all()

    # Compute quick stats for each project. Same per-run aggregation as
    # ``compute_project_stats`` — counts and quantities come from
    # ``print_log_entries`` joined to ``print_archives`` so reprints and
    # multi-plate prints contribute every run, not just the source file
    # (#1593). Quick stats and the full stats endpoint must agree.
    response = []
    for project in projects:
        log_quick_result = await db.execute(
            select(
                func.count(PrintLogEntry.id).label("archive_count"),
                func.coalesce(func.sum(PrintArchive.quantity), 0).label("total_items"),
                func.coalesce(
                    func.sum(case((PrintLogEntry.status == "completed", PrintArchive.quantity), else_=0)),
                    0,
                ).label("completed_count"),
                func.coalesce(
                    func.sum(case((PrintLogEntry.status.in_(_FAILURE_STATUSES), 1), else_=0)),
                    0,
                ).label("failed_count"),
            )
            .join(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
            .where(PrintArchive.project_id == project.id)
        )
        log_quick = log_quick_result.first()
        archive_count = int(log_quick.archive_count or 0)
        total_items = int(log_quick.total_items or 0)
        completed_count = int(log_quick.completed_count or 0)
        failed_count = int(log_quick.failed_count or 0)

        # Get queue count
        queue_count_result = await db.execute(
            select(func.count(PrintQueueItem.id)).where(
                PrintQueueItem.project_id == project.id,
                PrintQueueItem.status.in_(["pending", "printing"]),
            )
        )
        queue_count = queue_count_result.scalar() or 0

        # Plates progress: archive_count / target_count
        progress_percent = None
        if project.target_count and project.target_count > 0:
            progress_percent = round((archive_count / project.target_count) * 100, 1)

        # Get archive previews (up to 6 most recent)
        archives_result = await db.execute(
            select(PrintArchive)
            .where(PrintArchive.project_id == project.id)
            .order_by(PrintArchive.created_at.desc())
            .limit(6)
        )
        archives = archives_result.scalars().all()
        archive_previews = [
            ArchivePreview(
                id=a.id,
                print_name=a.print_name,
                thumbnail_path=a.thumbnail_path,
                status=a.status,
                filament_type=a.filament_type,
                filament_color=a.filament_color,
            )
            for a in archives
        ]

        response.append(
            ProjectListResponse(
                id=project.id,
                name=project.name,
                description=project.description,
                color=project.color,
                status=project.status,
                target_count=project.target_count,
                target_parts_count=project.target_parts_count,
                budget=project.budget,
                created_at=project.created_at,
                archive_count=archive_count,
                total_items=total_items,
                completed_count=completed_count,
                failed_count=failed_count,
                queue_count=queue_count,
                progress_percent=progress_percent,
                archives=archive_previews,
                url=project.url,
                cover_image_filename=project.cover_image_filename,
            )
        )

    return response


@router.post("/", response_model=ProjectResponse)
async def create_project(
    data: ProjectCreate,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_CREATE),
):
    """Create a new project."""
    # Verify parent exists if specified
    parent_name = None
    if data.parent_id:
        parent_result = await db.execute(select(Project).where(Project.id == data.parent_id))
        parent = parent_result.scalar_one_or_none()
        if not parent:
            raise HTTPException(status_code=400, detail="Parent project not found")
        parent_name = parent.name

    project = Project(
        name=data.name,
        description=data.description,
        color=data.color,
        target_count=data.target_count,
        target_parts_count=data.target_parts_count,
        notes=data.notes,
        tags=data.tags,
        due_date=data.due_date,
        priority=data.priority,
        budget=data.budget,
        parent_id=data.parent_id,
        url=data.url,
    )
    db.add(project)
    await db.flush()
    await db.refresh(project)

    stats = await compute_project_stats(db, project.id, project.target_count, project.target_parts_count)

    return ProjectResponse(
        id=project.id,
        name=project.name,
        description=project.description,
        color=project.color,
        status=project.status,
        target_count=project.target_count,
        target_parts_count=project.target_parts_count,
        notes=project.notes,
        attachments=project.attachments,
        url=project.url,
        cover_image_filename=project.cover_image_filename,
        tags=project.tags,
        due_date=project.due_date,
        priority=project.priority,
        budget=project.budget,
        is_template=project.is_template,
        template_source_id=project.template_source_id,
        parent_id=project.parent_id,
        parent_name=parent_name,
        children=[],
        created_at=project.created_at,
        updated_at=project.updated_at,
        stats=stats,
    )


# ============ Phase 8: Template Endpoints (Static routes BEFORE dynamic {project_id}) ============


@router.get("/templates", response_model=list[ProjectListResponse])
async def list_templates(
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """List all project templates."""
    result = await db.execute(select(Project).where(Project.is_template.is_(True)).order_by(Project.name))
    templates = result.scalars().all()

    response = []
    for project in templates:
        # Get archive count
        archive_count_result = await db.execute(
            select(func.count(PrintArchive.id)).where(PrintArchive.project_id == project.id)
        )
        archive_count = archive_count_result.scalar() or 0

        response.append(
            ProjectListResponse(
                id=project.id,
                name=project.name,
                description=project.description,
                color=project.color,
                status=project.status,
                target_count=project.target_count,
                budget=project.budget,
                created_at=project.created_at,
                archive_count=archive_count,
                queue_count=0,
                progress_percent=None,
                archives=[],
                url=project.url,
                cover_image_filename=project.cover_image_filename,
            )
        )

    return response


@router.post("/from-template/{template_id}", response_model=ProjectResponse)
async def create_project_from_template(
    template_id: int,
    name: str = None,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_CREATE),
):
    """Create a new project from a template."""
    result = await db.execute(select(Project).where(Project.id == template_id))
    template = result.scalar_one_or_none()

    if not template:
        raise HTTPException(status_code=404, detail="Template not found")

    if not template.is_template:
        raise HTTPException(status_code=400, detail="Project is not a template")

    # Create new project
    project = Project(
        name=name or template.name.replace(" (Template)", ""),
        description=template.description,
        color=template.color,
        target_count=template.target_count,
        target_parts_count=template.target_parts_count,
        notes=template.notes,
        tags=template.tags,
        priority=template.priority,
        budget=template.budget,
        is_template=False,
        template_source_id=template.id,
        url=template.url,
    )
    db.add(project)
    await db.flush()

    # Copy BOM items
    bom_result = await db.execute(select(ProjectBOMItem).where(ProjectBOMItem.project_id == template_id))
    bom_items = bom_result.scalars().all()

    for item in bom_items:
        new_item = ProjectBOMItem(
            project_id=project.id,
            name=item.name,
            quantity_needed=item.quantity_needed,
            quantity_acquired=0,
            unit_price=item.unit_price,
            sourcing_url=item.sourcing_url,
            stl_filename=item.stl_filename,
            remarks=item.remarks,
            sort_order=item.sort_order,
        )
        db.add(new_item)

    await db.flush()
    await db.refresh(project)

    stats = await compute_project_stats(db, project.id, project.target_count, project.target_parts_count)

    return ProjectResponse(
        id=project.id,
        name=project.name,
        description=project.description,
        color=project.color,
        status=project.status,
        target_count=project.target_count,
        target_parts_count=project.target_parts_count,
        notes=project.notes,
        attachments=project.attachments,
        url=project.url,
        cover_image_filename=project.cover_image_filename,
        tags=project.tags,
        due_date=project.due_date,
        priority=project.priority,
        budget=project.budget,
        is_template=project.is_template,
        template_source_id=project.template_source_id,
        parent_id=project.parent_id,
        parent_name=None,
        children=[],
        created_at=project.created_at,
        updated_at=project.updated_at,
        stats=stats,
    )


# ============ Dynamic {project_id} Routes ============


async def get_child_previews(db: AsyncSession, parent_id: int) -> list[ProjectChildPreview]:
    """Get preview info for child projects."""
    result = await db.execute(select(Project).where(Project.parent_id == parent_id).order_by(Project.name))
    children = result.scalars().all()

    previews = []
    for child in children:
        # Get completed count for progress (sum of quantities)
        completed_result = await db.execute(
            select(func.coalesce(func.sum(PrintArchive.quantity), 0)).where(
                PrintArchive.project_id == child.id,
                PrintArchive.status == "completed",
            )
        )
        completed_count = completed_result.scalar() or 0
        progress = None
        if child.target_count and child.target_count > 0:
            progress = round((int(completed_count) / child.target_count) * 100, 1)

        previews.append(
            ProjectChildPreview(
                id=child.id,
                name=child.name,
                color=child.color,
                status=child.status,
                progress_percent=progress,
            )
        )
    return previews


@router.get("/{project_id}", response_model=ProjectResponse)
async def get_project(
    project_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """Get a project by ID with detailed stats."""
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # Get parent name
    parent_name = None
    if project.parent_id:
        parent_result = await db.execute(select(Project.name).where(Project.id == project.parent_id))
        parent_name = parent_result.scalar()

    # Get children
    children = await get_child_previews(db, project.id)

    stats = await compute_project_stats(db, project.id, project.target_count, project.target_parts_count)

    return ProjectResponse(
        id=project.id,
        name=project.name,
        description=project.description,
        color=project.color,
        status=project.status,
        target_count=project.target_count,
        target_parts_count=project.target_parts_count,
        notes=project.notes,
        attachments=project.attachments,
        url=project.url,
        cover_image_filename=project.cover_image_filename,
        tags=project.tags,
        due_date=project.due_date,
        priority=project.priority,
        budget=project.budget,
        is_template=project.is_template,
        template_source_id=project.template_source_id,
        parent_id=project.parent_id,
        parent_name=parent_name,
        children=children,
        created_at=project.created_at,
        updated_at=project.updated_at,
        stats=stats,
    )


@router.patch("/{project_id}", response_model=ProjectResponse)
async def update_project(
    project_id: int,
    data: ProjectUpdate,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Update a project."""
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # Update fields if provided
    if data.name is not None:
        project.name = data.name
    if data.description is not None:
        project.description = data.description
    if data.color is not None:
        project.color = data.color
    if data.status is not None:
        if data.status not in ["active", "completed", "archived"]:
            raise HTTPException(status_code=400, detail="Invalid status")
        project.status = data.status
    if data.target_count is not None:
        project.target_count = data.target_count
    if data.target_parts_count is not None:
        project.target_parts_count = data.target_parts_count
    if data.notes is not None:
        project.notes = data.notes
    if data.tags is not None:
        project.tags = data.tags
    if data.due_date is not None:
        project.due_date = data.due_date
    if data.priority is not None:
        if data.priority not in ["low", "normal", "high", "urgent"]:
            raise HTTPException(status_code=400, detail="Invalid priority")
        project.priority = data.priority
    if "budget" in data.model_fields_set:
        project.budget = data.budget
    if "url" in data.model_fields_set:
        # Pydantic validator already guarantees http(s) prefix or None.
        project.url = data.url
    if data.parent_id is not None:
        # Verify parent exists and prevent circular reference
        if data.parent_id == project_id:
            raise HTTPException(status_code=400, detail="Project cannot be its own parent")
        if data.parent_id != 0:  # 0 means remove parent
            parent_result = await db.execute(select(Project).where(Project.id == data.parent_id))
            if not parent_result.scalar_one_or_none():
                raise HTTPException(status_code=400, detail="Parent project not found")
            project.parent_id = data.parent_id
        else:
            project.parent_id = None

    await db.flush()
    await db.refresh(project)

    # Get parent name
    parent_name = None
    if project.parent_id:
        parent_result = await db.execute(select(Project.name).where(Project.id == project.parent_id))
        parent_name = parent_result.scalar()

    # Get children
    children = await get_child_previews(db, project.id)

    stats = await compute_project_stats(db, project.id, project.target_count, project.target_parts_count)

    return ProjectResponse(
        id=project.id,
        name=project.name,
        description=project.description,
        color=project.color,
        status=project.status,
        target_count=project.target_count,
        target_parts_count=project.target_parts_count,
        notes=project.notes,
        attachments=project.attachments,
        url=project.url,
        cover_image_filename=project.cover_image_filename,
        tags=project.tags,
        due_date=project.due_date,
        priority=project.priority,
        budget=project.budget,
        is_template=project.is_template,
        template_source_id=project.template_source_id,
        parent_id=project.parent_id,
        parent_name=parent_name,
        children=children,
        created_at=project.created_at,
        updated_at=project.updated_at,
        stats=stats,
    )


@router.delete("/{project_id}")
async def delete_project(
    project_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_DELETE),
):
    """Delete a project. Archives and queue items will have project_id set to NULL."""
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    await db.delete(project)

    return {"message": "Project deleted"}


@router.get("/{project_id}/archives")
async def list_project_archives(
    project_id: int,
    limit: int = 100,
    offset: int = 0,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """List archives in a project."""
    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    if not result.scalar_one_or_none():
        raise HTTPException(status_code=404, detail="Project not found")

    # Get archives with both ``project`` and ``created_by`` eagerly loaded.
    # ``archive_to_response`` accesses ``archive.created_by.username`` to
    # surface the creator on the archive card; without selectinload that's
    # a lazy attribute access on a closed async session, which throws
    # ``MissingGreenlet`` and produces a 500. ``ArchiveService.list_archives``
    # already loads both — this route just got out of step.
    query = (
        select(PrintArchive)
        .options(selectinload(PrintArchive.project), selectinload(PrintArchive.created_by))
        .where(PrintArchive.project_id == project_id)
        .order_by(PrintArchive.created_at.desc())
        .limit(limit)
        .offset(offset)
    )
    result = await db.execute(query)
    archives = result.scalars().all()

    # Import the response converter from archives module
    from backend.app.api.routes.archives import _load_run_aggregates, archive_to_response

    # Load run aggregates so multi-run archives' time/accuracy badge is
    # suppressed consistently with the main archives 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]


@router.get("/{project_id}/queue")
async def list_project_queue(
    project_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """List queue items in a project."""
    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    if not result.scalar_one_or_none():
        raise HTTPException(status_code=404, detail="Project not found")

    # Get queue items
    query = select(PrintQueueItem).where(PrintQueueItem.project_id == project_id).order_by(PrintQueueItem.position)
    result = await db.execute(query)
    items = result.scalars().all()

    return items


@router.post("/{project_id}/add-archives")
async def add_archives_to_project(
    project_id: int,
    data: BatchAddArchives,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Batch add archives to a project."""
    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    if not result.scalar_one_or_none():
        raise HTTPException(status_code=404, detail="Project not found")

    # Update archives
    updated = 0
    for archive_id in data.archive_ids:
        result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
        archive = result.scalar_one_or_none()
        if archive:
            archive.project_id = project_id
            updated += 1

    return {"message": f"Added {updated} archives to project"}


@router.post("/{project_id}/add-queue")
async def add_queue_items_to_project(
    project_id: int,
    data: BatchAddQueueItems,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Batch add queue items to a project."""
    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    if not result.scalar_one_or_none():
        raise HTTPException(status_code=404, detail="Project not found")

    # Update queue items
    updated = 0
    for item_id in data.queue_item_ids:
        result = await db.execute(select(PrintQueueItem).where(PrintQueueItem.id == item_id))
        item = result.scalar_one_or_none()
        if item:
            item.project_id = project_id
            updated += 1

    return {"message": f"Added {updated} queue items to project"}


@router.post("/{project_id}/remove-archives")
async def remove_archives_from_project(
    project_id: int,
    data: BatchAddArchives,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Remove archives from a project (sets project_id to NULL)."""
    updated = 0
    for archive_id in data.archive_ids:
        result = await db.execute(
            select(PrintArchive).where(
                PrintArchive.id == archive_id,
                PrintArchive.project_id == project_id,
            )
        )
        archive = result.scalar_one_or_none()
        if archive:
            archive.project_id = None
            updated += 1

    return {"message": f"Removed {updated} archives from project"}


def get_project_attachments_dir(project_id: int) -> Path:
    """Get the attachments directory for a project."""
    base_dir = Path(settings.archive_dir)
    return base_dir / "projects" / str(project_id) / "attachments"


# Cover-image upload accepts only common web-renderable image types (#1155).
# Subset of ALLOWED_ATTACHMENT_EXTENSIONS minus .svg/.ico because those don't
# render well as a card thumbnail.
COVER_IMAGE_EXTENSIONS = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
COVER_IMAGE_CONTENT_TYPES = {
    ".jpg": "image/jpeg",
    ".jpeg": "image/jpeg",
    ".png": "image/png",
    ".gif": "image/gif",
    ".webp": "image/webp",
}


# Allowed file extensions for attachments
ALLOWED_ATTACHMENT_EXTENSIONS = {
    # Images
    ".jpg",
    ".jpeg",
    ".png",
    ".gif",
    ".webp",
    ".svg",
    ".bmp",
    ".ico",
    # Documents
    ".pdf",
    ".doc",
    ".docx",
    ".xls",
    ".xlsx",
    ".ppt",
    ".pptx",
    ".odt",
    ".ods",
    ".odp",
    ".txt",
    ".rtf",
    ".csv",
    ".md",
    # 3D/CAD files
    ".stl",
    ".obj",
    ".3mf",
    ".step",
    ".stp",
    ".iges",
    ".igs",
    ".f3d",
    ".scad",
    # Archives
    ".zip",
    ".rar",
    ".7z",
    ".tar",
    ".gz",
    # Code/scripts (for Klipper macros, scripts, etc.)
    ".py",
    ".sh",
    ".cfg",
    ".conf",
    ".gcode",
    ".ini",
    # Other common formats
    ".json",
    ".xml",
    ".yaml",
    ".yml",
}


@router.post("/{project_id}/attachments")
async def upload_attachment(
    project_id: int,
    file: UploadFile = File(...),
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Upload an attachment to a project."""
    logger.info("=== UPLOAD START: %s for project %s ===", file.filename, project_id)

    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # Validate file extension
    original_name = file.filename or "unknown"
    ext = os.path.splitext(original_name)[1].lower()
    if ext not in ALLOWED_ATTACHMENT_EXTENSIONS:
        raise HTTPException(
            status_code=400,
            detail=f"File type '{ext}' not supported. Allowed: images, PDFs, documents, STL, 3MF, archives.",
        )

    # Create attachments directory
    attachments_dir = get_project_attachments_dir(project_id)
    attachments_dir.mkdir(parents=True, exist_ok=True)

    # Generate unique filename
    unique_filename = f"{uuid.uuid4().hex}{ext}"
    file_path = attachments_dir / unique_filename  # SEC-PATH-OK: unique_filename = uuid.uuid4().hex + ext

    # Save file
    try:
        with open(file_path, "wb") as f:
            content = await file.read()
            f.write(content)
        logger.info("=== FILE SAVED: %s, size: %s ===", file_path, len(content))
    except Exception as e:
        logger.error("Failed to save attachment: %s", e)
        raise HTTPException(status_code=500, detail="Failed to save attachment")

    # Update project attachments JSON
    attachments = list(project.attachments or [])
    new_attachment = {
        "filename": unique_filename,
        "original_name": original_name,
        "size": len(content),
        "uploaded_at": datetime.now().isoformat(),
    }
    attachments.append(new_attachment)

    # Simple ORM update
    project.attachments = attachments
    db.add(project)  # Explicitly add to session

    logger.info("=== BEFORE COMMIT: %s attachments ===", len(attachments))

    await db.flush()
    await db.commit()

    logger.info("=== AFTER COMMIT ===")

    # Verify by re-querying
    result = await db.execute(select(Project).where(Project.id == project_id))
    fresh_project = result.scalar_one()

    logger.info("=== VERIFIED: %s attachments ===", len(fresh_project.attachments or []))

    return {
        "status": "success",
        "filename": unique_filename,
        "original_name": original_name,
        "attachments": fresh_project.attachments,
    }


@router.get("/{project_id}/attachments/{filename}")
async def download_attachment(
    project_id: int,
    filename: str,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """Download an attachment from a project."""
    # Validate filename to prevent path traversal
    if "/" in filename or "\\" in filename or ".." in filename or not filename:
        raise HTTPException(status_code=400, detail="Invalid filename")

    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # Verify attachment exists in project
    attachments = project.attachments or []
    attachment = next((a for a in attachments if a.get("filename") == filename), None)
    if not attachment:
        raise HTTPException(status_code=404, detail="Attachment not found")

    # Check file exists
    file_path = (
        get_project_attachments_dir(project_id) / filename
    )  # SEC-PATH-OK: filename validated above (no /, \\, .., empty) + attachment membership check
    if not file_path.exists():
        raise HTTPException(status_code=404, detail="Attachment file not found")

    return FileResponse(
        file_path,
        filename=attachment.get("original_name", filename),
        media_type="application/octet-stream",
    )


@router.delete("/{project_id}/attachments/{filename}")
async def delete_attachment(
    project_id: int,
    filename: str,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Delete an attachment from a project."""
    # Validate filename to prevent path traversal
    if "/" in filename or "\\" in filename or ".." in filename or not filename:
        raise HTTPException(status_code=400, detail="Invalid filename")

    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # Find and remove attachment from list
    attachments = project.attachments or []
    attachment = next((a for a in attachments if a.get("filename") == filename), None)
    if not attachment:
        raise HTTPException(status_code=404, detail="Attachment not found")

    # Remove from list
    attachments = [a for a in attachments if a.get("filename") != filename]
    project.attachments = attachments if attachments else None

    # Delete file
    file_path = (
        get_project_attachments_dir(project_id) / filename
    )  # SEC-PATH-OK: filename validated above (no /, \\, .., empty) + attachment membership check
    if file_path.exists():
        try:
            os.remove(file_path)
        except Exception as e:
            logger.warning("Failed to delete attachment file: %s", e)

    await db.flush()
    await db.refresh(project)

    return {
        "status": "success",
        "message": "Attachment deleted",
        "attachments": project.attachments,
    }


# ============ #1155: Cover image ============


@router.post("/{project_id}/cover-image")
async def upload_project_cover_image(
    project_id: int,
    file: UploadFile = File(...),
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Upload (or replace) the project's cover image (#1155).

    Stored alongside other attachments but tracked via Project.cover_image_filename
    so swap/delete operations don't touch the attachments list. Replaces any
    existing cover image — the prior file is deleted on disk before the new one
    lands so a stuck filesystem reference can't accumulate orphaned images.
    """
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    original_name = file.filename or "cover"
    ext = os.path.splitext(original_name)[1].lower()
    if ext not in COVER_IMAGE_EXTENSIONS:
        raise HTTPException(
            status_code=400,
            detail=f"Cover image must be one of {sorted(COVER_IMAGE_EXTENSIONS)}",
        )

    attachments_dir = get_project_attachments_dir(project_id)
    attachments_dir.mkdir(parents=True, exist_ok=True)

    # Remove the previous cover-image file from disk first so we don't accumulate
    # orphans when users repeatedly replace it. Best-effort: a missing/locked file
    # shouldn't block a successful replacement.
    if project.cover_image_filename:
        old_path = attachments_dir / project.cover_image_filename
        if old_path.exists():
            try:
                os.remove(old_path)
            except OSError as e:
                logger.warning("Failed to delete old cover image %s: %s", old_path, e)

    unique_filename = f"cover_{uuid.uuid4().hex}{ext}"
    file_path = attachments_dir / unique_filename  # SEC-PATH-OK: unique_filename = f"cover_{uuid.uuid4().hex}{ext}"
    try:
        with open(file_path, "wb") as f:
            content = await file.read()
            f.write(content)
    except OSError as e:
        logger.error("Failed to save cover image: %s", e)
        raise HTTPException(status_code=500, detail="Failed to save cover image")

    project.cover_image_filename = unique_filename
    db.add(project)
    await db.flush()
    await db.commit()

    return {
        "status": "success",
        "filename": unique_filename,
        "size": len(content),
    }


@router.get("/{project_id}/cover-image")
async def get_project_cover_image(
    project_id: int,
    db: AsyncSession = Depends(get_db),
    _: None = RequireCameraStreamTokenIfAuthEnabled,
):
    """Stream the project's cover image (#1155).

    Browsers can't attach `Authorization: Bearer ...` to `<img src>` requests,
    so this route accepts the same `?token=` stream-credential as
    /archives/{id}/thumbnail. The frontend wraps URLs with `withStreamToken`."""
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")
    if not project.cover_image_filename:
        raise HTTPException(status_code=404, detail="No cover image set")

    file_path = get_project_attachments_dir(project_id) / project.cover_image_filename
    if not file_path.exists():
        # DB references a file that vanished from disk — clear the dangling
        # reference so future GETs get a clean 404 instead of repeatedly
        # touching the filesystem.
        logger.warning("Cover image file missing for project %s: %s", project_id, file_path)
        project.cover_image_filename = None
        await db.commit()
        raise HTTPException(status_code=404, detail="Cover image file not found")

    ext = os.path.splitext(project.cover_image_filename)[1].lower()
    media_type = COVER_IMAGE_CONTENT_TYPES.get(ext, "application/octet-stream")
    return FileResponse(file_path, media_type=media_type)


@router.delete("/{project_id}/cover-image")
async def delete_project_cover_image(
    project_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Remove the project's cover image (#1155)."""
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    if project.cover_image_filename:
        file_path = get_project_attachments_dir(project_id) / project.cover_image_filename
        if file_path.exists():
            try:
                os.remove(file_path)
            except OSError as e:
                logger.warning("Failed to delete cover image file %s: %s", file_path, e)
        project.cover_image_filename = None
        db.add(project)
        await db.flush()
        await db.commit()

    return {"status": "success"}


# ============ Phase 7: BOM Endpoints ============


@router.get("/{project_id}/bom", response_model=list[BOMItemResponse])
async def list_bom_items(
    project_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """List all BOM items for a project."""
    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    if not result.scalar_one_or_none():
        raise HTTPException(status_code=404, detail="Project not found")

    # Get BOM items
    result = await db.execute(
        select(ProjectBOMItem)
        .where(ProjectBOMItem.project_id == project_id)
        .order_by(ProjectBOMItem.sort_order, ProjectBOMItem.id)
    )
    items = result.scalars().all()

    response = []
    for item in items:
        # Get archive name if linked
        archive_name = None
        if item.archive_id:
            archive_result = await db.execute(select(PrintArchive.print_name).where(PrintArchive.id == item.archive_id))
            archive_name = archive_result.scalar()

        response.append(
            BOMItemResponse(
                id=item.id,
                project_id=item.project_id,
                name=item.name,
                quantity_needed=item.quantity_needed,
                quantity_acquired=item.quantity_acquired,
                unit_price=item.unit_price,
                sourcing_url=item.sourcing_url,
                archive_id=item.archive_id,
                archive_name=archive_name,
                stl_filename=item.stl_filename,
                remarks=item.remarks,
                sort_order=item.sort_order,
                is_complete=item.quantity_acquired >= item.quantity_needed,
                created_at=item.created_at,
                updated_at=item.updated_at,
            )
        )

    return response


@router.post("/{project_id}/bom", response_model=BOMItemResponse)
async def create_bom_item(
    project_id: int,
    data: BOMItemCreate,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Add a BOM item to a project."""
    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    if not result.scalar_one_or_none():
        raise HTTPException(status_code=404, detail="Project not found")

    # Get max sort order
    max_order_result = await db.execute(
        select(func.max(ProjectBOMItem.sort_order)).where(ProjectBOMItem.project_id == project_id)
    )
    max_order = max_order_result.scalar() or 0

    item = ProjectBOMItem(
        project_id=project_id,
        name=data.name,
        quantity_needed=data.quantity_needed,
        unit_price=data.unit_price,
        sourcing_url=data.sourcing_url,
        archive_id=data.archive_id,
        stl_filename=data.stl_filename,
        remarks=data.remarks,
        sort_order=max_order + 1,
    )
    db.add(item)
    await db.flush()
    await db.refresh(item)

    # Get archive name if linked
    archive_name = None
    if item.archive_id:
        archive_result = await db.execute(select(PrintArchive.print_name).where(PrintArchive.id == item.archive_id))
        archive_name = archive_result.scalar()

    return BOMItemResponse(
        id=item.id,
        project_id=item.project_id,
        name=item.name,
        quantity_needed=item.quantity_needed,
        quantity_acquired=item.quantity_acquired,
        unit_price=item.unit_price,
        sourcing_url=item.sourcing_url,
        archive_id=item.archive_id,
        archive_name=archive_name,
        stl_filename=item.stl_filename,
        remarks=item.remarks,
        sort_order=item.sort_order,
        is_complete=item.quantity_acquired >= item.quantity_needed,
        created_at=item.created_at,
        updated_at=item.updated_at,
    )


@router.patch("/{project_id}/bom/{item_id}", response_model=BOMItemResponse)
async def update_bom_item(
    project_id: int,
    item_id: int,
    data: BOMItemUpdate,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Update a BOM item."""
    result = await db.execute(
        select(ProjectBOMItem).where(
            ProjectBOMItem.id == item_id,
            ProjectBOMItem.project_id == project_id,
        )
    )
    item = result.scalar_one_or_none()

    if not item:
        raise HTTPException(status_code=404, detail="BOM item not found")

    if data.name is not None:
        item.name = data.name
    if data.quantity_needed is not None:
        item.quantity_needed = data.quantity_needed
    if data.quantity_acquired is not None:
        item.quantity_acquired = data.quantity_acquired
    if data.unit_price is not None:
        item.unit_price = data.unit_price if data.unit_price != 0 else None
    if data.sourcing_url is not None:
        item.sourcing_url = data.sourcing_url if data.sourcing_url else None
    if data.archive_id is not None:
        item.archive_id = data.archive_id if data.archive_id != 0 else None
    if data.stl_filename is not None:
        item.stl_filename = data.stl_filename if data.stl_filename else None
    if data.remarks is not None:
        item.remarks = data.remarks if data.remarks else None

    await db.flush()
    await db.refresh(item)

    # Get archive name if linked
    archive_name = None
    if item.archive_id:
        archive_result = await db.execute(select(PrintArchive.print_name).where(PrintArchive.id == item.archive_id))
        archive_name = archive_result.scalar()

    return BOMItemResponse(
        id=item.id,
        project_id=item.project_id,
        name=item.name,
        quantity_needed=item.quantity_needed,
        quantity_acquired=item.quantity_acquired,
        unit_price=item.unit_price,
        sourcing_url=item.sourcing_url,
        archive_id=item.archive_id,
        archive_name=archive_name,
        stl_filename=item.stl_filename,
        remarks=item.remarks,
        sort_order=item.sort_order,
        is_complete=item.quantity_acquired >= item.quantity_needed,
        created_at=item.created_at,
        updated_at=item.updated_at,
    )


@router.delete("/{project_id}/bom/{item_id}")
async def delete_bom_item(
    project_id: int,
    item_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_UPDATE),
):
    """Delete a BOM item."""
    result = await db.execute(
        select(ProjectBOMItem).where(
            ProjectBOMItem.id == item_id,
            ProjectBOMItem.project_id == project_id,
        )
    )
    item = result.scalar_one_or_none()

    if not item:
        raise HTTPException(status_code=404, detail="BOM item not found")

    await db.delete(item)

    return {"status": "success", "message": "BOM item deleted"}


@router.post("/{project_id}/create-template", response_model=ProjectResponse)
async def create_template_from_project(
    project_id: int,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_CREATE),
):
    """Create a template from an existing project."""
    result = await db.execute(select(Project).where(Project.id == project_id))
    source = result.scalar_one_or_none()

    if not source:
        raise HTTPException(status_code=404, detail="Project not found")

    # Create template
    template = Project(
        name=f"{source.name} (Template)",
        description=source.description,
        color=source.color,
        target_count=source.target_count,
        target_parts_count=source.target_parts_count,
        notes=source.notes,
        tags=source.tags,
        priority=source.priority,
        budget=source.budget,
        is_template=True,
        template_source_id=source.id,
        url=source.url,
    )
    db.add(template)
    await db.flush()

    # Copy BOM items
    bom_result = await db.execute(select(ProjectBOMItem).where(ProjectBOMItem.project_id == project_id))
    bom_items = bom_result.scalars().all()

    for item in bom_items:
        new_item = ProjectBOMItem(
            project_id=template.id,
            name=item.name,
            quantity_needed=item.quantity_needed,
            quantity_acquired=0,
            unit_price=item.unit_price,
            sourcing_url=item.sourcing_url,
            stl_filename=item.stl_filename,
            remarks=item.remarks,
            sort_order=item.sort_order,
        )
        db.add(new_item)

    await db.flush()
    await db.refresh(template)

    stats = await compute_project_stats(db, template.id, template.target_count, template.target_parts_count)

    return ProjectResponse(
        id=template.id,
        name=template.name,
        description=template.description,
        color=template.color,
        status=template.status,
        target_count=template.target_count,
        target_parts_count=template.target_parts_count,
        notes=template.notes,
        attachments=template.attachments,
        url=template.url,
        cover_image_filename=template.cover_image_filename,
        tags=template.tags,
        due_date=template.due_date,
        priority=template.priority,
        budget=template.budget,
        is_template=template.is_template,
        template_source_id=template.template_source_id,
        parent_id=template.parent_id,
        parent_name=None,
        children=[],
        created_at=template.created_at,
        updated_at=template.updated_at,
        stats=stats,
    )


# ============ Phase 9: Timeline Endpoint ============


@router.get("/{project_id}/timeline", response_model=list[TimelineEvent])
async def get_project_timeline(
    project_id: int,
    limit: int = 50,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """Get timeline of events for a project."""
    # Verify project exists
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    events = []

    # Project creation event
    events.append(
        TimelineEvent(
            event_type="project_created",
            timestamp=project.created_at,
            title="Project created",
            description=f"Project '{project.name}' was created",
        )
    )

    # Get archives and add events
    archives_result = await db.execute(
        select(PrintArchive)
        .where(PrintArchive.project_id == project_id)
        .order_by(PrintArchive.created_at.desc())
        .limit(limit)
    )
    archives = archives_result.scalars().all()

    for archive in archives:
        if archive.status == "completed":
            events.append(
                TimelineEvent(
                    event_type="print_completed",
                    timestamp=archive.completed_at or archive.created_at,
                    title="Print completed",
                    description=archive.print_name,
                    metadata={
                        "archive_id": archive.id,
                        "print_time_hours": round((archive.print_time_seconds or 0) / 3600, 2),
                        "filament_grams": round(archive.filament_used_grams or 0, 1),
                    },
                )
            )
        elif archive.status == "failed":
            events.append(
                TimelineEvent(
                    event_type="print_failed",
                    timestamp=archive.completed_at or archive.created_at,
                    title="Print failed",
                    description=archive.print_name,
                    metadata={"archive_id": archive.id},
                )
            )

    # Get queue items
    queue_result = await db.execute(
        select(PrintQueueItem)
        .where(PrintQueueItem.project_id == project_id)
        .order_by(PrintQueueItem.created_at.desc())
        .limit(limit)
    )
    queue_items = queue_result.scalars().all()

    for item in queue_items:
        if item.status == "printing":
            events.append(
                TimelineEvent(
                    event_type="print_started",
                    timestamp=item.started_at or item.created_at,
                    title="Print started",
                    description=item.print_name,
                    metadata={"queue_item_id": item.id},
                )
            )
        elif item.status == "pending":
            events.append(
                TimelineEvent(
                    event_type="queued",
                    timestamp=item.created_at,
                    title="Added to queue",
                    description=item.print_name,
                    metadata={"queue_item_id": item.id},
                )
            )

    # Sort by timestamp descending
    events.sort(key=lambda e: e.timestamp, reverse=True)

    return events[:limit]


# ============ Phase 10: Import/Export Endpoints ============


@router.get("/{project_id}/export")
async def export_project(
    project_id: int,
    format: str = "zip",  # "zip" (with files) or "json" (metadata only)
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_READ),
):
    """Export a project. Use format=zip (default) for full export with files, or format=json for metadata only."""
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # Get BOM items
    bom_result = await db.execute(
        select(ProjectBOMItem).where(ProjectBOMItem.project_id == project_id).order_by(ProjectBOMItem.sort_order)
    )
    bom_items = bom_result.scalars().all()

    bom_export = [
        {
            "name": item.name,
            "quantity_needed": item.quantity_needed,
            "quantity_acquired": item.quantity_acquired,
            "unit_price": item.unit_price,
            "sourcing_url": item.sourcing_url,
            "stl_filename": item.stl_filename,
            "remarks": item.remarks,
        }
        for item in bom_items
    ]

    # Get linked folders and their files
    folders_result = await db.execute(
        select(LibraryFolder).where(LibraryFolder.project_id == project_id).order_by(LibraryFolder.name)
    )
    linked_folders = folders_result.scalars().all()

    folders_export = []
    files_to_include = []  # (archive_path, zip_path)

    for folder in linked_folders:
        # Get files in this folder
        files_result = await db.execute(
            LibraryFile.active().where(LibraryFile.folder_id == folder.id).order_by(LibraryFile.filename)
        )
        files = files_result.scalars().all()

        folder_files = []
        for f in files:
            folder_files.append(
                {
                    "filename": f.filename,
                    "file_type": f.file_type,
                    "notes": f.notes,
                }
            )
            # Add file to include in ZIP
            library_dir = get_library_dir()
            file_path = library_dir / f.file_path
            if file_path.exists():
                zip_path = f"files/{folder.name}/{f.filename}"
                files_to_include.append((file_path, zip_path))
                # Also include thumbnail if exists
                if f.thumbnail_path:
                    thumb_path = library_dir / f.thumbnail_path
                    if thumb_path.exists():
                        thumb_zip_path = f"files/{folder.name}/.thumbnails/{f.filename}.png"
                        files_to_include.append((thumb_path, thumb_zip_path))

        folders_export.append(
            {
                "name": folder.name,
                "files": folder_files,
            }
        )

    # Build project JSON
    project_data = {
        "name": project.name,
        "description": project.description,
        "color": project.color,
        "status": project.status,
        "target_count": project.target_count,
        "target_parts_count": project.target_parts_count,
        "notes": project.notes,
        "tags": project.tags,
        "due_date": project.due_date.isoformat() if project.due_date else None,
        "priority": project.priority,
        "budget": project.budget,
        "bom_items": bom_export,
        "linked_folders": folders_export,
    }

    # Return JSON if requested (for bulk export)
    if format == "json":
        return project_data

    # Create ZIP in memory
    zip_buffer = io.BytesIO()
    with zipfile.ZipFile(zip_buffer, "w", zipfile.ZIP_DEFLATED) as zf:
        # Add project.json
        zf.writestr("project.json", json.dumps(project_data, indent=2))

        # Add files
        for file_path, zip_path in files_to_include:
            zf.write(file_path, zip_path)

    zip_buffer.seek(0)

    # Generate filename
    safe_name = "".join(c if c.isalnum() or c in "-_ " else "_" for c in project.name)
    filename = f"{safe_name}_{datetime.now().strftime('%Y-%m-%d')}.zip"

    return StreamingResponse(
        zip_buffer,
        media_type="application/zip",
        headers={"Content-Disposition": build_content_disposition(filename)},
    )


@router.post("/import", response_model=ProjectResponse)
async def import_project(
    data: ProjectImport,
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_CREATE),
):
    """Import a project with optional BOM items and linked folders."""
    # Create the project
    project = Project(
        name=data.name,
        description=data.description,
        color=data.color,
        status=data.status,
        target_count=data.target_count,
        target_parts_count=data.target_parts_count,
        notes=data.notes,
        tags=data.tags,
        due_date=data.due_date,
        priority=data.priority,
        budget=data.budget,
    )
    db.add(project)
    await db.flush()

    # Create BOM items
    for idx, bom_data in enumerate(data.bom_items):
        bom_item = ProjectBOMItem(
            project_id=project.id,
            name=bom_data.name,
            quantity_needed=bom_data.quantity_needed,
            quantity_acquired=bom_data.quantity_acquired,
            unit_price=bom_data.unit_price,
            sourcing_url=bom_data.sourcing_url,
            stl_filename=bom_data.stl_filename,
            remarks=bom_data.remarks,
            sort_order=idx,
        )
        db.add(bom_item)

    # Create linked folders in library
    for folder_data in data.linked_folders:
        # Check if folder with this name already exists at root level
        existing_result = await db.execute(
            select(LibraryFolder).where(
                LibraryFolder.name == folder_data.name,
                LibraryFolder.parent_id.is_(None),
            )
        )
        existing_folder = existing_result.scalar_one_or_none()

        if existing_folder:
            # Link existing folder to project
            existing_folder.project_id = project.id
        else:
            # Create new folder linked to project
            new_folder = LibraryFolder(
                name=folder_data.name,
                project_id=project.id,
                is_external=False,
                external_readonly=False,
                external_show_hidden=False,
            )
            db.add(new_folder)

    await db.flush()
    await db.refresh(project)

    stats = await compute_project_stats(db, project.id, project.target_count, project.target_parts_count)

    return ProjectResponse(
        id=project.id,
        name=project.name,
        description=project.description,
        color=project.color,
        status=project.status,
        target_count=project.target_count,
        target_parts_count=project.target_parts_count,
        notes=project.notes,
        attachments=project.attachments,
        url=project.url,
        cover_image_filename=project.cover_image_filename,
        tags=project.tags,
        due_date=project.due_date,
        priority=project.priority,
        budget=project.budget,
        is_template=project.is_template,
        template_source_id=project.template_source_id,
        parent_id=project.parent_id,
        parent_name=None,
        children=[],
        created_at=project.created_at,
        updated_at=project.updated_at,
        stats=stats,
    )


@router.post("/import/file", response_model=ProjectResponse)
async def import_project_file(
    file: UploadFile = File(...),
    db: AsyncSession = Depends(get_db),
    _: User | None = RequirePermissionIfAuthEnabled(Permission.PROJECTS_CREATE),
):
    """Import a project from a ZIP or JSON file."""
    if not file.filename:
        raise HTTPException(status_code=400, detail="No filename provided")

    # Determine file type
    filename_lower = file.filename.lower()
    content = await file.read()

    if filename_lower.endswith(".zip"):
        # Extract project.json from ZIP
        try:
            with zipfile.ZipFile(io.BytesIO(content)) as zf:
                if "project.json" not in zf.namelist():
                    raise HTTPException(status_code=400, detail="ZIP must contain project.json")
                project_json = zf.read("project.json")
                data = json.loads(project_json)

                # Get list of files in the ZIP
                zip_files = {name: zf.read(name) for name in zf.namelist() if name.startswith("files/")}
        except zipfile.BadZipFile:
            raise HTTPException(status_code=400, detail="Invalid ZIP file")
    elif filename_lower.endswith(".json"):
        try:
            data = json.loads(content)
            zip_files = {}
        except json.JSONDecodeError:
            raise HTTPException(status_code=400, detail="Invalid JSON file")
    else:
        raise HTTPException(status_code=400, detail="File must be .zip or .json")

    # Create the project
    project = Project(
        name=data.get("name", "Imported Project"),
        description=data.get("description"),
        color=data.get("color"),
        status=data.get("status", "active"),
        target_count=data.get("target_count"),
        target_parts_count=data.get("target_parts_count"),
        notes=data.get("notes"),
        tags=data.get("tags"),
        due_date=datetime.fromisoformat(data["due_date"]) if data.get("due_date") else None,
        priority=data.get("priority", 0),
        budget=data.get("budget"),
    )
    db.add(project)
    await db.flush()

    # Create BOM items
    for idx, bom_data in enumerate(data.get("bom_items", [])):
        bom_item = ProjectBOMItem(
            project_id=project.id,
            name=bom_data.get("name", "Unnamed"),
            quantity_needed=bom_data.get("quantity_needed", 1),
            quantity_acquired=bom_data.get("quantity_acquired", 0),
            unit_price=bom_data.get("unit_price"),
            sourcing_url=bom_data.get("sourcing_url"),
            stl_filename=bom_data.get("stl_filename"),
            remarks=bom_data.get("remarks"),
            sort_order=idx,
        )
        db.add(bom_item)

    # Create linked folders and files
    library_dir = get_library_dir()
    for folder_data in data.get("linked_folders", []):
        folder_name = folder_data.get("name")
        if not folder_name:
            continue

        # Containment check on the folder name — refuses absolute paths and
        # ``..`` traversal in ``project.json[linked_folders[*].name]``. The
        # previous code did ``library_dir / folder_name`` directly, which
        # collapses to ``Path(folder_name)`` when folder_name is absolute
        # and lets ``..`` escape after mkdir.
        folder_path = safe_join_under(library_dir, folder_name)

        # Check if folder exists
        existing_result = await db.execute(
            select(LibraryFolder).where(
                LibraryFolder.name == folder_name,
                LibraryFolder.parent_id.is_(None),
            )
        )
        existing_folder = existing_result.scalar_one_or_none()

        if existing_folder:
            # Link existing folder to project
            existing_folder.project_id = project.id
            folder = existing_folder
        else:
            # Create new folder
            folder = LibraryFolder(
                name=folder_name,
                project_id=project.id,
                is_external=False,
                external_readonly=False,
                external_show_hidden=False,
            )
            db.add(folder)
            await db.flush()

            # Create folder on disk
            folder_path.mkdir(parents=True, exist_ok=True)

        # Import files for this folder from ZIP
        folder_prefix = f"files/{folder_name}/"
        for zip_path, file_content in zip_files.items():
            if not zip_path.startswith(folder_prefix):
                continue
            if "/.thumbnails/" in zip_path:
                continue  # Skip thumbnails, we'll regenerate them

            relative_path = zip_path[len(folder_prefix) :]
            if not relative_path:
                continue

            # Containment check on the per-entry relative path. ZIP names
            # can carry ``..`` segments by spec; without resolve + parent
            # containment, ``files/<folder>/../../../etc/x`` escapes
            # ``library_dir`` entirely. ``relative_path`` is split into
            # parts because ``safe_join_under`` rejects parts that start
            # with ``/``, and a single combined string would hide an
            # embedded ``..`` segment behind a forward slash.
            file_disk_path = safe_join_under(
                library_dir,
                folder_name,
                *Path(relative_path).parts,
            )
            file_disk_path.parent.mkdir(parents=True, exist_ok=True)
            file_disk_path.write_bytes(file_content)

            # Determine file type
            ext = Path(relative_path).suffix.lower()
            if ext in [".stl", ".3mf", ".obj"]:
                file_type = "model"
            elif ext in [".gcode"]:
                file_type = "gcode"
            elif ext in [".jpg", ".jpeg", ".png", ".gif", ".webp"]:
                file_type = "image"
            else:
                file_type = "other"

            # Create library file record
            lib_file = LibraryFile(
                folder_id=folder.id,
                filename=relative_path,
                file_path=f"{folder_name}/{relative_path}",
                file_type=file_type,
                file_size=len(file_content),
                is_external=False,
            )
            db.add(lib_file)

    await db.flush()
    await db.refresh(project)

    stats = await compute_project_stats(db, project.id, project.target_count, project.target_parts_count)

    return ProjectResponse(
        id=project.id,
        name=project.name,
        description=project.description,
        color=project.color,
        status=project.status,
        target_count=project.target_count,
        target_parts_count=project.target_parts_count,
        notes=project.notes,
        attachments=project.attachments,
        url=project.url,
        cover_image_filename=project.cover_image_filename,
        tags=project.tags,
        due_date=project.due_date,
        priority=project.priority,
        budget=project.budget,
        is_template=project.is_template,
        template_source_id=project.template_source_id,
        parent_id=project.parent_id,
        parent_name=None,
        children=[],
        created_at=project.created_at,
        updated_at=project.updated_at,
        stats=stats,
    )