from fastapi import APIRouter, Depends
from sqlalchemy.orm import Session
from typing import List, Optional
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
from sqlalchemy import func
from sqlalchemy.orm import joinedload
from app.models.merchant_product import OperationType, DeliveryType, DeliveryTimeType
from app.models.merchant import MerchantInfo
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():
        if value is not None:
            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("/list", response_model=ResponseModel)
async def list_merchant_products(
    merchant_id: Optional[int] = None,
    skip: int = 0,
    limit: int = 20,
    db: Session = Depends(get_db)
):
    """获取商品列表"""
    # 联表查询商家信息
    query = db.query(MerchantProductDB).options(
        joinedload(MerchantProductDB.merchant)
    )

    # 如果指定了商家ID，添加筛选条件
    if merchant_id:
        query = query.filter(MerchantProductDB.merchant_id == merchant_id)
    
    total = query.count()
    results = query.order_by(
        MerchantProductDB.recommend.asc(),
        MerchantProductDB.create_time.desc()
    ).offset(skip).limit(limit).all()
    
    # 处理返回数据
    products = []
    for product in results:
        product_info = MerchantProductInfo.model_validate(product)
        products.append({
            **product_info.model_dump(),
            "merchant_name": product.merchant.name,
            "operation_type_name": "蜂快" if product.operation_type == OperationType.SELF_OPERATED else "业主",
            "delivery_type_name": "配送到家" if product.delivery_type == DeliveryType.DELIVERY else "自提",
            "delivery_time_type_name": "及时达" if product.delivery_time_type == DeliveryTimeType.IMMEDIATE else "定时达"
        })
    
    return success_response(data={
        "total": total,
        "items": 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()

    product_info = MerchantProductInfo.model_validate(product)

    merchant = MerchantInfo.model_validate(product.merchant)

    result = {
        **product_info.model_dump(),
        "gift_points" : int(float(product.gift_points_rate) / 10 * float(product.sale_price)),
        "merchant": merchant.model_dump()
    }
    
    if not product:
        return error_response(code=404, message="产品不存在")
    
    return success_response(data=result)

@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)}")