from fastapi import APIRouter, Depends
from sqlalchemy.orm import Session
from typing import List, Optional
from app.models.order import (
    ShippingOrderDB, 
    ShippingOrderPackageDB, 
    OrderCreate, 
    OrderInfo,
    OrderPackageInfo,
    generate_order_id,
    OrderPriceCalculateRequest,
    OrderPriceInfo,
    OrderStatus,
    OrderCancel,
    OrderComplete
)
from app.models.database import get_db
from app.api.deps import get_current_user, get_deliveryman_user
from app.models.user import UserDB
from app.core.response import success_response, error_response, ResponseModel
from app.models.coupon import UserCouponDB, CouponStatus
from datetime import datetime, timezone
from app.core.config import settings
from app.models.address import AddressDB

router = APIRouter()

@router.post("/", response_model=ResponseModel)
async def create_shipping_order(
    order: OrderCreate,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """创建配送订单"""
    
    # 生成订单号
    orderid = generate_order_id()
    
    # 计算订单价格
    package_count = sum(
        len(package.pickup_codes.split(',')) 
        for package in order.price_request.packages 
        if package.pickup_codes
    )
    
    # 计算原始金额
    original_amount = settings.ORDER_BASE_PRICE
    if package_count > settings.ORDER_EXTRA_PACKAGE_THRESHOLD:
        extra_packages = package_count - settings.ORDER_EXTRA_PACKAGE_THRESHOLD
        original_amount += extra_packages * settings.ORDER_EXTRA_PACKAGE_PRICE
    
    # 计算优惠券折扣
    coupon_discount = 0
    coupon_id = None
    # 查询用户优惠券
    user_coupon = db.query(UserCouponDB).filter(
        UserCouponDB.user_id == current_user.userid,
        UserCouponDB.status == CouponStatus.UNUSED,
        UserCouponDB.expire_time > datetime.now(timezone.utc)
    ).first()
    
    if user_coupon:
        coupon_discount = user_coupon.coupon_amount
        coupon_id = user_coupon.id
        # 更新优惠券状态
        user_coupon.status = CouponStatus.USED
    
    # 计算最终金额
    final_amount = max(0, original_amount - coupon_discount)
    
    # 创建订单
    db_order = ShippingOrderDB(
        orderid=orderid,
        userid=current_user.userid,
        addressid=order.addressid,
        package_count=package_count,
        original_amount=original_amount,
        coupon_discount_amount=coupon_discount,
        coupon_id=coupon_id,
        final_amount=final_amount,
        delivery_method=order.delivery_method
    )
    db.add(db_order)
    
    # 创建订单包裹
    for package in order.price_request.packages:
        db_package = ShippingOrderPackageDB(
            orderid=orderid,
            station_id=package.station_id,
            pickup_codes=package.pickup_codes
        )
        db.add(db_package)
    
    try:
        db.commit()
        db.refresh(db_order)
        
        # 查询包裹信息
        packages = db.query(ShippingOrderPackageDB).filter(
            ShippingOrderPackageDB.orderid == orderid
        ).all()
        
        return success_response(
            message="订单创建成功",
            data={
                "order": OrderInfo.model_validate(db_order),
                "packages": [OrderPackageInfo.model_validate(p) for p in packages]
            }
        )
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"订单创建失败: {str(e)}")

@router.get("/{orderid}", response_model=ResponseModel)
async def get_order(
    orderid: str,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """获取订单详情"""
    # 查询订单
    order = db.query(ShippingOrderDB).filter(
        ShippingOrderDB.orderid == orderid,
        ShippingOrderDB.userid == current_user.userid
    ).first()
    
    if not order:
        return error_response(code=404, message="订单不存在")
    
    # 查询包裹信息
    packages = db.query(ShippingOrderPackageDB).filter(
        ShippingOrderPackageDB.orderid == orderid
    ).all()
    
    return success_response(data={
        "order": OrderInfo.model_validate(order),
        "packages": [OrderPackageInfo.model_validate(p) for p in packages]
    })

@router.get("/", response_model=ResponseModel)
async def get_user_orders(
    skip: int = 0,
    limit: int = 10,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """获取用户的订单列表"""
    orders = db.query(ShippingOrderDB).filter(
        ShippingOrderDB.userid == current_user.userid
    ).order_by(
        ShippingOrderDB.create_time.desc()
    ).offset(skip).limit(limit).all()
    
    return success_response(data=[OrderInfo.model_validate(o) for o in orders]) 

@router.post("/calculate-price", response_model=ResponseModel)
async def calculate_order_price(
    request: OrderPriceCalculateRequest,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """计算订单价格"""
    # 计算所有包裹中的取件码总数
    package_count = sum(
        len(package.pickup_codes.split(',')) 
        for package in request.packages 
        if package.pickup_codes
    )
    
    # 计算原始金额
    original_amount = settings.ORDER_BASE_PRICE
    if package_count > settings.ORDER_EXTRA_PACKAGE_THRESHOLD:
        extra_packages = package_count - settings.ORDER_EXTRA_PACKAGE_THRESHOLD
        original_amount += extra_packages * settings.ORDER_EXTRA_PACKAGE_PRICE
    
    # 计算优惠券折扣
    coupon_discount = 0
    used_coupon_id = None
    
    # 查询用户所有可用的优惠券
    available_coupons = db.query(UserCouponDB).filter(
        UserCouponDB.user_id == current_user.userid,
        UserCouponDB.status == CouponStatus.UNUSED
    ).order_by(
        UserCouponDB.coupon_amount.desc()  # 优先使用面额大的优惠券
    ).all()
    
    # 选择最优惠的券
    if available_coupons:
        user_coupon = available_coupons[0]  # 取面额最大的优惠券
        coupon_discount = user_coupon.coupon_amount
        used_coupon_id = user_coupon.id
    
    # 计算最终金额
    final_amount = max(0, original_amount - coupon_discount)
    
    price_info = OrderPriceInfo(
        package_count=package_count,
        original_amount=original_amount,
        coupon_discount_amount=coupon_discount,
        coupon_id=used_coupon_id,
        final_amount=final_amount
    )
    
    return success_response(data=price_info) 

@router.post("/{orderid}/cancel", response_model=ResponseModel)
async def cancel_order(
    orderid: str,
    cancel_data: OrderCancel,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """取消订单"""
    # 查询订单
    order = db.query(ShippingOrderDB).filter(
        ShippingOrderDB.orderid == orderid,
        ShippingOrderDB.userid == current_user.userid
    ).first()
    
    if not order:
        return error_response(code=404, message="订单不存在")
    
    # 检查订单状态是否可取消
    if order.status not in [OrderStatus.PENDING, OrderStatus.ACCEPTED]:
        return error_response(code=400, message="当前订单状态不可取消")
    
    try:
        # 更新订单状态和取消原因
        order.status = OrderStatus.CANCELLED
        order.cancel_reason = cancel_data.reason
        
        # 如果使用了优惠券，返还优惠券
        if order.coupon_id:
            coupon = db.query(UserCouponDB).filter(
                UserCouponDB.id == order.coupon_id
            ).first()
            if coupon:
                coupon.status = CouponStatus.UNUSED
        
        db.commit()
        return success_response(
            message="订单取消成功",
            data=OrderInfo.model_validate(order)
        )
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"取消订单失败: {str(e)}") 

@router.post("/{orderid}/complete", response_model=ResponseModel)
async def complete_order(
    orderid: str,
    complete_data: OrderComplete,
    db: Session = Depends(get_db),
    current_user: UserDB = Depends(get_current_user)
):
    """完成订单"""
    # 查询订单
    order = db.query(ShippingOrderDB).filter(
        ShippingOrderDB.orderid == orderid,
        ShippingOrderDB.userid == current_user.userid
    ).first()
    
    if not order:
        return error_response(code=404, message="订单不存在")
    
    # 检查订单状态
    if order.status != OrderStatus.ACCEPTED:
        return error_response(code=400, message="只有已接单的订单才能标记为完成")
    
    try:
        # 更新订单状态和完成图片
        order.status = OrderStatus.COMPLETED
        if complete_data.images:
            order.complete_images = ",".join(complete_data.images)
        
        db.commit()
        return success_response(
            message="订单已完成",
            data=OrderInfo.model_validate(order)
        )
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"完成订单失败: {str(e)}") 

@router.get("/delivery", response_model=ResponseModel)
async def get_delivery_orders(
    status: Optional[OrderStatus] = None,
    community_building_id: Optional[int] = None,
    skip: int = 0,
    limit: int = 10,
    db: Session = Depends(get_db),
    deliveryman: UserDB = Depends(get_deliveryman_user)  # 使用已有的配送员权限检查
):
    """获取配送订单列表（仅配送员可用）
    
    Args:
        status: 订单状态筛选
        community_building_id: 社区楼栋ID筛选
        skip: 分页偏移
        limit: 每页数量
    """
    # 基础查询
    query = db.query(ShippingOrderDB).join(
        AddressDB,
        ShippingOrderDB.addressid == AddressDB.id
    )
    
    # 添加状态筛选
    if status:
        query = query.filter(ShippingOrderDB.status == status)
    
    # 添加社区楼栋筛选
    if community_building_id:
        query = query.filter(
            AddressDB.community_building_id == community_building_id
        )
    
    # 获取总数
    total = query.count()
    
    # 获取分页数据并按创建时间倒序排序
    orders = query.order_by(
        ShippingOrderDB.create_time.desc()
    ).offset(skip).limit(limit).all()
    
    return success_response(data={
        "total": total,
        "items": [OrderInfo.model_validate(o) for o in orders]
    }) 

@router.post("/{orderid}/accept", response_model=ResponseModel)
async def accept_order(
    orderid: str,
    db: Session = Depends(get_db),
    deliveryman: UserDB = Depends(get_deliveryman_user)
):
    """接单（仅配送员可用）"""
    # 查询订单
    order = db.query(ShippingOrderDB).filter(
        ShippingOrderDB.orderid == orderid
    ).first()
    
    if not order:
        return error_response(code=404, message="订单不存在")
    
    # 检查订单状态
    if order.status != OrderStatus.CREATED:
        return error_response(code=400, message="只能接待新创建的订单")
    
    # 检查订单是否已被接单
    if order.deliveryman_user_id is not None:
        return error_response(code=400, message="订单已被其他配送员接单")
    
    try:
        # 更新订单状态和配送员ID
        order.status = OrderStatus.ACCEPTED
        order.deliveryman_user_id = deliveryman.userid
        
        db.commit()
        return success_response(
            message="接单成功",
            data=OrderInfo.model_validate(order)
        )
    except Exception as e:
        db.rollback()
        return error_response(code=500, message=f"接单失败: {str(e)}")