from fastapi import APIRouter, Depends
from sqlalchemy.orm import Session
from typing import Optional, List
from app.models.merchant_pay_order import (
    MerchantPayOrderDB,
    MerchantPayOrderCreate,
    MerchantPayOrderInfo,
    MerchantPayOrderStatus)
from app.models.merchant import MerchantDB
from app.models.database import get_db
from app.api.deps import get_current_user, get_admin_user
from app.models.user import UserDB
from app.core.response import success_response, error_response, ResponseModel
from datetime import datetime, timezone
from app.core.config import settings
from pydantic import BaseModel
from app.core.utils import CommonUtils

router = APIRouter()

class CalculatePointsRequest(BaseModel):
    """计算积分请求"""
    merchant_id: int
    amount: float

@router.post("/calculate-points", response_model=ResponseModel)
async def calculate_gift_points(
    request: CalculatePointsRequest,
    db: Session = Depends(get_db)
):
    """计算支付订单可获得的积分数量"""
    # 检查商家是否存在
    merchant = db.query(MerchantDB).filter(
        MerchantDB.id == request.merchant_id
    ).first()
    if not merchant:
        return error_response(code=404, message="商家不存在")
    
    # 计算赠送积分
    gift_points = request.amount * (float(merchant.pay_gift_points_rate) / 100) * settings.POINT_RATIO
    
    return success_response(data={
        "gift_points": float(gift_points)
    })

@router.post("", response_model=ResponseModel)
async def create_pay_order(
    order: MerchantPayOrderCreate,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """创建支付订单"""
    # 检查商家是否存在
    merchant = db.query(MerchantDB).filter(
        MerchantDB.id == order.merchant_id
    ).first()
    if not merchant:
        return error_response(code=404, message="商家不存在")
    
    # 生成订单号
    order_id = CommonUtils.generate_order_id('P')
    
    # 创建订单
    db_order = MerchantPayOrderDB(
        order_id=order_id,
        merchant_id=order.merchant_id,
        user_id=current_user.userid,
        amount=order.amount,
        gift_points=order.amount * (float(merchant.pay_gift_points_rate) / 100) * settings.POINT_RATIO
    )
    
    try:
        db.add(db_order)
        db.commit()
        db.refresh(db_order)
        
        # 获取完整订单信息
        order = db.query(MerchantPayOrderDB).join(
            MerchantDB,
            MerchantPayOrderDB.merchant_id == MerchantDB.id
        ).filter(
            MerchantPayOrderDB.id == db_order.id
        ).first()
        
        # 获取商家名称
        merchant_name = db.query(MerchantDB.name).filter(
            MerchantDB.id == order.merchant_id
        ).scalar()
        
        return success_response(data=MerchantPayOrderInfo(
            id=order.id,
            order_id=order.order_id,
            merchant_id=order.merchant_id,
            user_id=order.user_id,
            amount=float(order.amount),
            gift_points=float(order.gift_points),
            status=order.status,
            create_time=order.create_time,
            update_time=order.update_time,
            pay_time=order.pay_time,
            merchant_name=merchant_name
        ))
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"创建订单失败: {str(e)}")

@router.get("", response_model=ResponseModel)
async def list_pay_orders(
    status: Optional[MerchantPayOrderStatus] = None,
    skip: int = 0,
    limit: int = 20,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """获取支付订单列表"""
    # 构建基础查询
    query = db.query(
        MerchantPayOrderDB,
        MerchantDB
    ).join(
        MerchantDB,
        MerchantPayOrderDB.merchant_id == MerchantDB.id
    ).filter(
        MerchantPayOrderDB.user_id == current_user.userid,
    )
    
    # 添加状态筛选
    if status:
        query = query.filter(MerchantPayOrderDB.status == status)
    
    # 获取总数
    total = query.count()
    
    # 获取分页数据
    orders = query.order_by(
        MerchantPayOrderDB.create_time.desc()
    ).offset(skip).limit(limit).all()
    
    # 处理返回数据
    order_list = [
        MerchantPayOrderInfo(
            id=order.MerchantPayOrderDB.id,
            order_id=order.MerchantPayOrderDB.order_id,
            merchant_id=order.MerchantPayOrderDB.merchant_id,
            user_id=order.MerchantPayOrderDB.user_id,
            amount=float(order.MerchantPayOrderDB.amount),
            gift_points=float(order.MerchantPayOrderDB.gift_points),
            status=order.MerchantPayOrderDB.status,
            create_time=order.MerchantPayOrderDB.create_time,
            update_time=order.MerchantPayOrderDB.update_time,
            pay_time=order.MerchantPayOrderDB.pay_time,
            merchant_name=order.MerchantDB.name,
            merchant_image=order.MerchantDB.brand_image_url
        ) for order in orders
    ]
    
    return success_response(data={
        "total": total,
        "items": order_list
    })

@router.get("/admin/list", response_model=ResponseModel)
async def admin_list_pay_orders(
    status: Optional[MerchantPayOrderStatus] = None,
    user_id: Optional[int] = None,
    order_id: Optional[str] = None,
    skip: int = 0,
    limit: int = 20,
    db: Session = Depends(get_db),
    admin_user: UserDB = Depends(get_admin_user)
):
    """获取支付订单列表（管理员接口）"""
    # 构建基础查询
    query = db.query(MerchantPayOrderDB).join(
        MerchantDB,
        MerchantPayOrderDB.merchant_id == MerchantDB.id
    )
    
    # 添加筛选条件
    if status:
        query = query.filter(MerchantPayOrderDB.status == status)
    if user_id:
        query = query.filter(MerchantPayOrderDB.user_id == user_id)
    if order_id:
        query = query.filter(MerchantPayOrderDB.order_id == order_id)
    
    # 获取总数
    total = query.count()
    
    # 获取分页数据
    orders = query.order_by(
        MerchantPayOrderDB.create_time.desc()
    ).offset(skip).limit(limit).all()
    
    # 获取商家名称映射
    merchant_ids = [order.merchant_id for order in orders]
    merchant_names = dict(
        db.query(MerchantDB.id, MerchantDB.name).filter(
            MerchantDB.id.in_(merchant_ids)
        ).all()
    )
    
    # 处理返回数据
    order_list = [
        MerchantPayOrderInfo(
            id=order.id,
            order_id=order.order_id,
            merchant_id=order.merchant_id,
            user_id=order.user_id,
            amount=float(order.amount),
            gift_points=float(order.gift_points),
            status=order.status,
            create_time=order.create_time,
            update_time=order.update_time,
            pay_time=order.pay_time,
            merchant_name=merchant_names.get(order.merchant_id)
        ) for order in orders
    ]
    
    return success_response(data={
        "total": total,
        "items": order_list
    })