"""
app/api/v1/product_images.py — R5 产品多图管理（列/删/改场景/设主图）

上传走 products.py 的 /products/{id}/upload-image（带 scene）。
本文件管已上传图的增删改。product.image_path 始终同步当前主图（向后兼容）。
"""
import logging
from typing import Annotated

from fastapi import APIRouter, Depends
from pydantic import BaseModel
from sqlalchemy.orm import Session

from app.constants.enums import ProductImageScene
from app.core.database import get_db
from app.core.response import ok, raise_not_found, raise_business
from app.middleware.workspace_guard import CurrentUser, require_write_permission
from app.models.product import Product, ProductImage

logger = logging.getLogger(__name__)
router = APIRouter(tags=["product-images"])


class SceneUpdate(BaseModel):
    scene: str


def _get_product(db: Session, product_id: int, workspace_id: int) -> Product:
    p = db.query(Product).filter(
        Product.id == product_id, Product.workspace_id == workspace_id
    ).first()
    if not p:
        raise_not_found("产品不存在")
    return p


def _get_image(db: Session, product_id: int, image_id: int) -> ProductImage:
    img = db.query(ProductImage).filter(
        ProductImage.id == image_id, ProductImage.product_id == product_id
    ).first()
    if not img:
        raise_not_found("产品图不存在")
    return img


@router.get("/products/{product_id}/images")
def list_images(
    product_id: int,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    _get_product(db, product_id, current_user.workspace_id)
    imgs = db.query(ProductImage).filter(
        ProductImage.product_id == product_id
    ).order_by(ProductImage.sort_order).all()
    return ok([
        {"id": im.id, "path": im.path, "scene": im.scene,
         "is_primary": im.is_primary, "sort_order": im.sort_order}
        for im in imgs
    ])


@router.put("/products/{product_id}/images/{image_id}/scene")
def update_scene(
    product_id: int, image_id: int, body: SceneUpdate,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    _get_product(db, product_id, current_user.workspace_id)
    if body.scene not in {s.value for s in ProductImageScene}:
        raise_business(f"非法场景类型 {body.scene}")
    img = _get_image(db, product_id, image_id)
    img.scene = body.scene
    db.commit()
    logger.info("product image scene updated: id=%s scene=%s", image_id, body.scene)
    return ok({"id": image_id, "scene": body.scene})


@router.put("/products/{product_id}/images/{image_id}/primary")
def set_primary(
    product_id: int, image_id: int,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    p = _get_product(db, product_id, current_user.workspace_id)
    img = _get_image(db, product_id, image_id)
    db.query(ProductImage).filter(
        ProductImage.product_id == product_id, ProductImage.is_primary == True
    ).update({"is_primary": False})
    img.is_primary = True
    p.image_path = img.path   # 同步主图字段（管道/校验读此字段）
    db.commit()
    logger.info("product primary image set: product_id=%s image_id=%s", product_id, image_id)
    return ok({"product_id": product_id, "primary_image_id": image_id})


@router.delete("/products/{product_id}/images/{image_id}")
def delete_image(
    product_id: int, image_id: int,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    p = _get_product(db, product_id, current_user.workspace_id)
    img = _get_image(db, product_id, image_id)
    was_primary = img.is_primary
    db.delete(img)
    db.flush()
    # 删的是主图：把剩余 sort_order 最小的一张顶上来当主图，保证 image_path 不悬空
    if was_primary:
        nxt = db.query(ProductImage).filter(
            ProductImage.product_id == product_id
        ).order_by(ProductImage.sort_order).first()
        if nxt:
            nxt.is_primary = True
            p.image_path = nxt.path
        else:
            p.image_path = None
    db.commit()
    logger.info("product image deleted: product_id=%s image_id=%s was_primary=%s",
                product_id, image_id, was_primary)
    return ok({"deleted": image_id})