from fastapi import APIRouter, Depends
from sqlalchemy.orm import Session
from typing import List
from app.models.merchant_product import (
    MerchantProductDB,
    MerchantProductCreate,
    MerchantProductUpdate,
    MerchantProductInfo
)
from app.models.database import get_db
from app.api.deps import get_admin_user
from app.models.user import UserDB
from app.core.response import success_response, error_response, ResponseModel
from app.models.merchant import MerchantDB

router = APIRouter()

@router.post("", response_model=ResponseModel)
async def create_merchant_product(
    product: MerchantProductCreate,
    db: Session = Depends(get_db),
    admin: UserDB = Depends(get_admin_user)
):
    """创建商家产品（管理员）"""
    
    # 检查商家是否存在
    merchant = db.query(MerchantDB).filter(
        MerchantDB.id == product.merchant_id
    ).first()
    
    if not merchant:
        return error_response(code=404, message="商家不存在")
    
    db_product = MerchantProductDB(**product.model_dump())
    db.add(db_product)
    
    try:
        db.commit()
        db.refresh(db_product)
        return success_response(data=MerchantProductInfo.model_validate(db_product))
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"创建失败: {str(e)}")

@router.put("/{product_id}", response_model=ResponseModel)
async def update_product(
    product_id: int,
    product: MerchantProductUpdate,
    db: Session = Depends(get_db),
    admin: UserDB = Depends(get_admin_user)
):
    """更新商家产品（管理员）"""
    db_product = db.query(MerchantProductDB).filter(
        MerchantProductDB.id == product_id
    ).first()
    
    if not db_product:
        return error_response(code=404, message="产品不存在")
    
    update_data = product.model_dump(exclude_unset=True)
    for key, value in update_data.items():
        setattr(db_product, key, value)
    
    try:
        db.commit()
        db.refresh(db_product)
        return success_response(data=MerchantProductInfo.model_validate(db_product))
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"更新失败: {str(e)}")

@router.get("/merchant/{merchant_id}", response_model=ResponseModel)
async def list_merchant_products(
    merchant_id: int,
    skip: int = 0,
    limit: int = 20,
    db: Session = Depends(get_db)
):
    """获取商家的产品列表"""
    products = db.query(MerchantProductDB).filter(
        MerchantProductDB.merchant_id == merchant_id
    ).order_by(
        MerchantProductDB.create_time.desc()
    ).offset(skip).limit(limit).all()
    
    return success_response(data=[
        MerchantProductInfo.model_validate(p) for p in products
    ])

@router.get("/{product_id}", response_model=ResponseModel)
async def get_product(
    product_id: int,
    db: Session = Depends(get_db)
):
    """获取产品详情"""
    product = db.query(MerchantProductDB).filter(
        MerchantProductDB.id == product_id
    ).first()
    
    if not product:
        return error_response(code=404, message="产品不存在")
    
    return success_response(data=MerchantProductInfo.model_validate(product))

@router.delete("/{product_id}", response_model=ResponseModel)
async def delete_product(
    product_id: int,
    db: Session = Depends(get_db),
    admin: UserDB = Depends(get_admin_user)
):
    """删除商家产品（管理员）"""
    db_product = db.query(MerchantProductDB).filter(
        MerchantProductDB.id == product_id
    ).first()
    
    if not db_product:
        return error_response(code=404, message="产品不存在")
    
    try:
        db.delete(db_product)
        db.commit()
        return success_response(message="删除成功")
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"删除失败: {str(e)}")