bambuddy/backend/app/schemas/spool.py

from datetime import datetime, timezone

from pydantic import BaseModel, Field, field_validator

from backend.app.schemas.supplier import SpoolSupplierResponse

# Visual variant applied to a spool's swatch — purely cosmetic, does not
# affect MQTT/firmware. Kept independent of `subtype` so users can override
# the rendering hint without touching Bambu's categorical filament label.
# Mirrors the visual variants the spool form's `KNOWN_VARIANTS` exposes so
# the catalog and spool form share one vocabulary; structural variants like
# gradient/dual-color/tri-color/multicolor combine with `extra_colors` for
# rendering, surface effects (sparkle/wood/marble/glow/matte) layer overlays.
ALLOWED_EFFECT_TYPES = frozenset(
    {
        # Surface effects
        "sparkle",
        "wood",
        "marble",
        "glow",
        "matte",
        # Sheen / finish variants
        "silk",
        "galaxy",
        "rainbow",
        "metal",
        "translucent",
        # Multi-colour structures (drive gradient rendering when paired with extra_colors)
        "gradient",
        "dual-color",
        "tri-color",
        "multicolor",
    }
)

# Cap how many gradient stops we accept on input so a paste of arbitrary text
# can't blow up the stored value or downstream rendering.
MAX_EXTRA_COLOR_STOPS = 8


def normalize_extra_colors(value: str | None) -> str | None:
    """Parse comma-separated hex tokens into canonical lowercase form.

    Accepts 6- or 8-char hex per token, with or without leading `#`. Returns
    None for blank input, raises ValueError for malformed tokens or too many
    stops. Output is the comma-joined canonical form (no `#`, lowercase).
    """
    if value is None:
        return None
    raw = value.strip()
    if not raw:
        return None
    tokens = [tok.strip().lstrip("#").lower() for tok in raw.split(",") if tok.strip()]
    if not tokens:
        return None
    if len(tokens) > MAX_EXTRA_COLOR_STOPS:
        raise ValueError(f"extra_colors accepts at most {MAX_EXTRA_COLOR_STOPS} stops")
    for tok in tokens:
        if len(tok) not in (6, 8):
            raise ValueError(f"extra_colors token '{tok}' must be 6 or 8 hex chars")
        try:
            int(tok, 16)
        except ValueError as exc:
            raise ValueError(f"extra_colors token '{tok}' is not valid hex") from exc
    return ",".join(tokens)


def normalize_material_number(value: str | None) -> str | None:
    """Trim the material number and treat a blank one as unset (#2870).

    Every write path lands here (form, bulk edit, CSV import, direct API), so
    "15" and "15 " can never become two groups in the statistics aggregate or
    two entries in the inventory filter. Blank collapses to NULL rather than
    "", which keeps "has no number" a single state to query for.
    """
    if value is None:
        return None
    return value.strip() or None


def normalize_effect_type(value: str | None) -> str | None:
    if value is None:
        return None
    trimmed = value.strip().lower()
    if not trimmed:
        return None
    # Tolerate "Dual Color" / "dual_color" / "dual color" → "dual-color" so
    # users pasting from spool-subtype labels don't hit a validation wall.
    canonical = trimmed.replace("_", "-").replace(" ", "-")
    if canonical not in ALLOWED_EFFECT_TYPES:
        raise ValueError(f"effect_type must be one of: {sorted(ALLOWED_EFFECT_TYPES)}")
    return canonical


def naive_utc(value: datetime | None) -> datetime | None:
    """Store a datetime the way Bambuddy's naive ``DateTime`` columns hold it: UTC.

    A browser sends local time with an offset. Dropping the offset without
    converting would shift the stored moment by that offset (#2863).
    """
    if value is not None and value.tzinfo is not None:
        return value.astimezone(timezone.utc).replace(tzinfo=None)
    return value


class SpoolBase(BaseModel):
    material: str = Field(..., min_length=1, max_length=50)
    subtype: str | None = None
    color_name: str | None = None
    rgba: str | None = Field(None, pattern=r"^[0-9A-Fa-f]{8}$")
    extra_colors: str | None = None
    effect_type: str | None = None
    brand: str | None = None

    @field_validator("extra_colors")
    @classmethod
    def _validate_extra_colors(cls, v: str | None) -> str | None:
        return normalize_extra_colors(v)

    @field_validator("effect_type")
    @classmethod
    def _validate_effect_type(cls, v: str | None) -> str | None:
        return normalize_effect_type(v)

    label_weight: int = 1000
    core_weight: int = 250
    core_weight_catalog_id: int | None = None
    weight_used: float = 0
    # Anchor for the resettable "Total Consumed" display. The Inventory
    # page shows `weight_used - weight_used_baseline`; the per-spool /
    # bulk "Reset usage to 0" action sets baseline = weight_used so the
    # counter zeroes without touching remaining (#1390).
    weight_used_baseline: float = 0
    slicer_filament: str | None = None
    slicer_filament_name: str | None = None
    nozzle_temp_min: int | None = None
    nozzle_temp_max: int | None = None
    note: str | None = None
    tag_uid: str | None = None
    tray_uuid: str | None = None
    data_origin: str | None = None
    tag_type: str | None = None
    cost_per_kg: float | None = Field(default=None, ge=0)
    weight_locked: bool = False
    last_scale_weight: int | None = None
    last_weighed_at: datetime | None = None
    # User-defined category + per-spool low-stock threshold override (#729).
    category: str | None = Field(default=None, max_length=50)
    low_stock_threshold_pct: int | None = Field(default=None, ge=1, le=99)
    # Internal material / article number (#2870) — the purchasing identifier,
    # shared by all spools of the same product. Free text, no uniqueness.
    material_number: str | None = Field(default=None, max_length=64)

    # mode="before": trim first, so a padded value is held to the 64
    # characters it will store, not to the length it arrived with.
    @field_validator("material_number", mode="before")
    @classmethod
    def _validate_material_number(cls, v):
        return normalize_material_number(v) if isinstance(v, str) else v

    # Free-text storage location, distinct from `location` (AMS slot
    # assignment). Column has lived on the ORM since the inventory rework
    # but was missing from this schema, so writes were silently dropped (#1291).
    storage_location: str | None = Field(default=None, max_length=255)
    location_id: int | None = Field(default=None, gt=0)


class SpoolCreate(SpoolBase):
    pass


class SpoolBulkCreate(BaseModel):
    spool: SpoolCreate
    quantity: int = Field(default=1, ge=1, le=100)


class SpoolUpdate(BaseModel):
    material: str | None = None
    subtype: str | None = None
    color_name: str | None = None
    rgba: str | None = Field(None, pattern=r"^[0-9A-Fa-f]{8}$")
    extra_colors: str | None = None
    effect_type: str | None = None
    brand: str | None = None

    @field_validator("extra_colors")
    @classmethod
    def _validate_extra_colors(cls, v: str | None) -> str | None:
        return normalize_extra_colors(v)

    @field_validator("effect_type")
    @classmethod
    def _validate_effect_type(cls, v: str | None) -> str | None:
        return normalize_effect_type(v)

    label_weight: int | None = None
    core_weight: int | None = None
    core_weight_catalog_id: int | None = None
    weight_used: float | None = None
    slicer_filament: str | None = None
    slicer_filament_name: str | None = None
    nozzle_temp_min: int | None = None
    nozzle_temp_max: int | None = None
    note: str | None = None
    tag_uid: str | None = None
    tray_uuid: str | None = None
    data_origin: str | None = None
    tag_type: str | None = None
    cost_per_kg: float | None = Field(default=None, ge=0)
    weight_locked: bool | None = None
    # Set by hand for a drying done outside an AMS; null clears it (#2863).
    last_dried_at: datetime | None = None

    @field_validator("last_dried_at")
    @classmethod
    def _validate_last_dried_at(cls, v: datetime | None) -> datetime | None:
        return naive_utc(v)

    # User-defined category + per-spool low-stock threshold override (#729).
    category: str | None = Field(default=None, max_length=50)
    low_stock_threshold_pct: int | None = Field(default=None, ge=1, le=99)
    # Internal material / article number (#2870).
    material_number: str | None = Field(default=None, max_length=64)

    # mode="before": trim first, so a padded value is held to the 64
    # characters it will store, not to the length it arrived with.
    @field_validator("material_number", mode="before")
    @classmethod
    def _validate_material_number(cls, v):
        return normalize_material_number(v) if isinstance(v, str) else v

    storage_location: str | None = Field(default=None, max_length=255)
    location_id: int | None = Field(default=None, gt=0)


class SpoolKProfileBase(BaseModel):
    printer_id: int
    extruder: int = 0
    nozzle_diameter: str = "0.4"
    nozzle_type: str | None = None
    k_value: float
    name: str | None = None
    cali_idx: int | None = None
    setting_id: str | None = None


class SpoolKProfileResponse(SpoolKProfileBase):
    id: int
    spool_id: int
    created_at: datetime

    class Config:
        from_attributes = True


class SpoolFilamentPresetBase(BaseModel):
    """One per-printer-model slicer preset override for a spool.

    ``nozzle_diameter`` defaults to "" meaning "any nozzle of this model". The
    spool form always sends a concrete size; the empty form is for API clients
    that want one value to cover a model. Lengths match the columns, which are wider than
    ``Spool.slicer_filament`` so a preset id that fits the Spoolman write
    schema cannot truncate on the way in.
    """

    printer_model: str = Field(..., min_length=1, max_length=50)
    nozzle_diameter: str = Field(default="", max_length=10)
    slicer_filament: str | None = Field(default=None, max_length=128)
    slicer_filament_name: str | None = Field(default=None, max_length=255)


class SpoolFilamentPresetResponse(SpoolFilamentPresetBase):
    id: int
    spool_id: int
    created_at: datetime

    class Config:
        from_attributes = True


class SpoolResponse(SpoolBase):
    id: int
    # rgba is intentionally unconstrained on the response side: the write paths
    # (SpoolCreate, SpoolUpdate) enforce the 8-char hex pattern, but legacy rows
    # or data sourced from AMS firmware / backups may carry malformed values.
    # A single bad row must not 500 the entire inventory list endpoint (#1055).
    rgba: str | None = None
    added_full: bool | None = None
    last_used: datetime | None = None
    # Last drying (#2863). Only the date is writable, through SpoolUpdate.
    last_dried_at: datetime | None = None
    last_dried_temp: int | None = None
    last_dried_hours: float | None = None
    encode_time: datetime | None = None
    tag_uid: str | None = None
    tray_uuid: str | None = None
    data_origin: str | None = None
    tag_type: str | None = None
    archived_at: datetime | None = None
    created_at: datetime
    updated_at: datetime
    k_profiles: list[SpoolKProfileResponse] = []
    # Supplier assignments (#2988): where this product can be bought, with
    # per-assignment article number / price and a purchase-source marker.
    # Reads the ORM relationship `supplier_links`, which every route
    # answering with this schema loads explicitly (see spool_response_loads).
    suppliers: list[SpoolSupplierResponse] = Field(default=[], validation_alias="supplier_links")

    class Config:
        from_attributes = True
        populate_by_name = True


class MaterialNumberStats(BaseModel):
    """Per-material-number inventory aggregate (#2870).

    ``spool_count`` and ``remaining_g`` cover active (non-archived) spools;
    ``consumed_g`` and ``cost`` sum the recorded usage history of every spool
    carrying the number, archived included — consumption doesn't disappear
    when a spool is archived.
    """

    material_number: str
    spool_count: int
    remaining_g: float
    consumed_g: float
    cost: float


class SpoolAssignmentCreate(BaseModel):
    spool_id: int
    printer_id: int
    ams_id: int
    tray_id: int


class SpoolAssignmentResponse(BaseModel):
    id: int
    spool_id: int
    printer_id: int
    printer_name: str | None = None
    ams_id: int
    tray_id: int
    fingerprint_color: str | None = None
    fingerprint_type: str | None = None
    created_at: datetime
    spool: SpoolResponse | None = None
    configured: bool = False
    pending_config: bool = False  # True when slot was empty at assign time; will configure on insert
    ams_label: str | None = None  # User-defined friendly name for the AMS unit

    class Config:
        from_attributes = True