"""商品 CRUD（采集箱 / 编辑 / 删除）。"""
from __future__ import annotations

from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy import select, func
from sqlalchemy.ext.asyncio import AsyncSession

from db import get_db
from deps import get_current_user
from models import Product, ProductAsset
from models.enums import Stage
from schemas.product import ProductDetail, ProductListItem, ProductUpdate

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


@router.get("")
async def list_products(
    stage: str | None = None,
    q: str | None = None,
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
    _user: dict = Depends(get_current_user),
):
    stmt = select(Product)
    if stage:
        stmt = stmt.where(Product.stage == stage)
    if q:
        stmt = stmt.where(Product.name.ilike(f"%{q}%") | Product.offer_id.ilike(f"%{q}%"))

    total = (await db.execute(select(func.count()).select_from(stmt.subquery()))).scalar() or 0
    rows = (await db.execute(
        stmt.order_by(Product.updated_at.desc()).offset((page - 1) * page_size).limit(page_size)
    )).scalars().all()
    items = [ProductListItem.model_validate(r) for r in rows]
    return {"total": total, "items": items}


@router.get("/{product_id}", response_model=ProductDetail)
async def get_product(
    product_id: str,
    db: AsyncSession = Depends(get_db),
    _user: dict = Depends(get_current_user),
):
    product = await db.get(Product, UUID(product_id))
    if product is None:
        raise HTTPException(status_code=404, detail="商品不存在")
    return ProductDetail.model_validate(product)


@router.post("", response_model=ProductDetail)
async def create_product(
    body: ProductUpdate,
    db: AsyncSession = Depends(get_db),
    _user: dict = Depends(get_current_user),
):
    product = Product(stage=Stage.collected)
    _apply_update(product, body)
    db.add(product)
    await db.commit()
    await db.refresh(product)
    return ProductDetail.model_validate(product)


@router.post("/{product_id}/copy", response_model=ProductDetail)
async def copy_product(
    product_id: str,
    db: AsyncSession = Depends(get_db),
    _user: dict = Depends(get_current_user),
):
    """复制商品为新变体：继承标题/描述/属性/型号名称/计价，重置货号与图片。"""
    src = await db.get(Product, UUID(product_id))
    if src is None:
        raise HTTPException(status_code=404, detail="商品不存在")
    clone = Product(
        stage=Stage.collected,
        shop_id=src.shop_id,
        source_platform=src.source_platform,
        source_item_id=None,  # 新变体，不沿用源 itemId（避免去重冲突）
        source_url=src.source_url,
        offer_id="",          # 重置货号
        name=src.name,
        description=src.description,
        description_category_id=src.description_category_id,
        type_id=src.type_id,
        price=src.price,
        old_price=src.old_price,
        currency_code=src.currency_code,
        vat=src.vat,
        depth=src.depth,
        width=src.width,
        height=src.height,
        dimension_unit=src.dimension_unit,
        weight=src.weight,
        weight_unit=src.weight_unit,
        barcode=src.barcode,
        images=None,          # 重置图片
        primary_image=None,
        images360=None,
        color_image=None,
        attributes=src.attributes,
        complex_attributes=src.complex_attributes,
        raw=src.raw,          # 含 model_name（型号名称）
        pricing=src.pricing,
        copy=src.copy,
        fx_rate=src.fx_rate,
    )
    db.add(clone)
    await db.commit()
    await db.refresh(clone)
    return ProductDetail.model_validate(clone)


@router.patch("/{product_id}", response_model=ProductDetail)
async def update_product(
    product_id: str,
    body: ProductUpdate,
    db: AsyncSession = Depends(get_db),
    _user: dict = Depends(get_current_user),
):
    product = await db.get(Product, UUID(product_id))
    if product is None:
        raise HTTPException(status_code=404, detail="商品不存在")
    _apply_update(product, body)
    await db.commit()
    await db.refresh(product)
    return ProductDetail.model_validate(product)


@router.delete("/{product_id}")
async def delete_product(
    product_id: str,
    hard: bool = False,
    db: AsyncSession = Depends(get_db),
    _user: dict = Depends(get_current_user),
):
    product = await db.get(Product, UUID(product_id))
    if product is None:
        raise HTTPException(status_code=404, detail="商品不存在")
    if hard:
        await db.delete(product)
    else:
        product.stage = Stage.archived
    await db.commit()
    return {"deleted": True}


@router.get("/{product_id}/assets")
async def list_assets(
    product_id: str,
    db: AsyncSession = Depends(get_db),
    _user: dict = Depends(get_current_user),
):
    rows = (await db.scalars(
        select(ProductAsset)
        .where(ProductAsset.product_id == UUID(product_id))
        .order_by(ProductAsset.group_key, ProductAsset.sort_order)
    )).all()
    return [
        {
            "id": str(a.id),
            "group_key": a.group_key,
            "variant_name": a.variant_name,
            "sort_order": a.sort_order,
            "type": a.type,
            "source_url": a.source_url,
            "stored_url": a.stored_url,
            "status": a.status.value,
            "width": a.width,
            "height": a.height,
            "error": a.error,
        }
        for a in rows
    ]


def _apply_update(product: Product, body: ProductUpdate) -> None:
    data = body.model_dump(exclude_unset=True)
    if "stage" in data and data["stage"]:
        data["stage"] = Stage(data["stage"])
    for key, value in data.items():
        if value is not None or key in ("raw", "pricing", "copy", "images", "attributes", "complex_attributes", "shop_id"):
            setattr(product, key, value)