"""支付相关 API"""
from typing import Optional
from datetime import datetime
from fastapi import APIRouter, Depends, HTTPException, Request
from sqlalchemy.orm import Session
from pydantic import BaseModel, Field

from app.core.database import get_db
from app.core.auth import get_current_user
from app.core.response import success_response, error_response
from app.core.wechat_pay import wechat_pay, get_wechat_pay_v2
from app.core.config import settings
from app.crud.order import order_crud

router = APIRouter(prefix="/api/payment", tags=["支付接口"])


class WechatPayRequest(BaseModel):
    """微信支付请求"""
    order_id: str = Field(..., description="订单ID")
    openid: Optional[str] = Field(None, description="用户OpenID")


class WechatPayResponse(BaseModel):
    """微信支付响应"""
    success: bool
    prepay_id: Optional[str] = None
    pay_sign: Optional[str] = None
    timestamp: Optional[str] = None
    nonce_str: Optional[str] = None
    error: Optional[str] = None


@router.post("/wechat/create", response_model=dict)
async def create_wechat_pay(
    request: WechatPayRequest,
    db: Session = Depends(get_db),
    current_user: dict = Depends(get_current_user)
):
    """
    创建微信支付订单

    返回调起微信支付所需的参数
    """
    try:
        # 获取订单信息
        order = order_crud.get(db, request.order_id)
        if not order:
            return error_response(404, "订单不存在")

        # 检查订单状态
        if getattr(order, "payment_method", None) != "online":
            return error_response(400, "线下支付订单不支持微信支付")
        pay_status = getattr(order, "pay_status", None)
        if pay_status:
            if pay_status != "pending_payment":
                return error_response(400, "订单状态不允许支付")
        elif order.status != "pending_payment":
            return error_response(400, "订单状态不允许支付")

        # 检查金额
        total_amount = int(float(order.total_amount) * 100)  # 元转分（微信支付单位为分）
        if total_amount <= 0:
            return error_response(400, "订单金额必须大于0")

        # 生成商户订单号
        out_trade_no = order.order_no

        # 回调地址
        notify_url = settings.WXPAY_NOTIFY_URL

        # 调用微信支付统一下单
        pay_client = get_wechat_pay_v2()

        result = pay_client.unified_order(
            out_trade_no=out_trade_no,
            total_fee=total_amount,
            body="叁强鲜配-订单支付",
            openid=request.openid,
            trade_type="JSAPI"
        )

        if result.get("success"):
            pp = result.get("pay_params") or {}
            return success_response({
                "prepay_id": result.get("prepay_id"),
                "order_id": order.id,
                "order_no": order.order_no,
                "appId": pp.get("appId"),
                "timeStamp": pp.get("timeStamp"),
                "nonceStr": pp.get("nonceStr"),
                "package": pp.get("package"),
                "signType": pp.get("signType"),
                "paySign": pp.get("paySign"),
            })
        else:
            return error_response(500, result.get("error", "创建支付订单失败"))

    except Exception as e:
        return error_response(500, f"创建支付订单失败: {str(e)}")


@router.get("/query/{order_no}", response_model=dict)
def query_payment_status(
    order_no: str,
    db: Session = Depends(get_db),
    current_user: dict = Depends(get_current_user)
):
    """
    查询支付状态

    用于前端轮询查询支付结果
    """
    try:
        order = order_crud.get_by_order_no(db, order_no)
        if not order:
            return error_response(404, "订单不存在")

        return success_response({
            "order_id": order.id,
            "order_no": order.order_no,
            "status": order.status,
            "is_paid": (getattr(order, "pay_status", None) in ["paid", "refunding", "refunded"]) if getattr(order, "pay_status", None) else (order.status not in ["pending_payment", "cancelled"])
        })
    except Exception as e:
        return error_response(500, f"查询失败: {str(e)}")


@router.post("/notify", response_model=dict)
async def wechat_pay_notify(request: Request):
    """
    微信支付回调通知

    注意：此接口不需要认证
    """
    try:
        # 接收微信回调数据
        body = await request.body()
        xml_data = body.decode('utf-8')

        # 解析回调数据
        pay_client = get_wechat_pay_v2()
        result = pay_client.parse_notify(xml_data)

        if result.get("success"):
            data = result.get("data", {})
            out_trade_no = data.get("out_trade_no")  # 商户订单号
            transaction_id = data.get("transaction_id")  # 微信订单号
            total_fee = data.get("total_fee")  # 订单金额(分)

            # 查询订单并更新状态
            db = next(get_db())
            try:
                order = order_crud.get_by_order_no(db, out_trade_no)
                if order:
                    order.paid_amount = int(total_fee) / 100
                    if getattr(order, "order_status", None) != "cancelled":
                        order.order_status = "pending_confirm"
                    if getattr(order, "delivery_status", None) in [None, ""]:
                        order.delivery_status = "pending_dispatch"
                    order_crud.sync_pay_fields_from_amounts(order)
                    order.update_at = datetime.now()
                    db.commit()

                # 返回成功
                return success_response({"return_code": "SUCCESS", "return_msg": "OK"})
            finally:
                db.close()
        else:
            return error_response(400, "签名验证失败")
    except Exception as e:
        return error_response(500, f"处理回调失败: {str(e)}")


@router.post("/refund-notify", response_model=dict)
async def wechat_refund_notify(request: Request):
    """
    微信退款回调通知

    注意：此接口不需要认证
    """
    try:
        body = await request.body()
        xml_data = body.decode('utf-8')

        pay_client = get_wechat_pay_v2()
        result = pay_client.parse_notify(xml_data)

        if result.get("success"):
            data = result.get("data", {})
            out_trade_no = data.get("out_trade_no")  # 商户订单号
            refund_id = data.get("refund_id")  # 退款单号

            # 查询订单并更新退款状态
            db = next(get_db())
            try:
                order = order_crud.get_by_order_no(db, out_trade_no)
                if order:
                    # 更新退款状态
                    order_crud.update_refund_status(db, order.id, "refunded", refund_id)

                return success_response({"return_code": "SUCCESS", "return_msg": "OK"})
            finally:
                db.close()
        else:
            return error_response(400, "签名验证失败")
    except Exception as e:
        return error_response(500, f"处理退款回调失败: {str(e)}")


@router.post("/close/{order_no}", response_model=dict)
def close_payment(
    order_no: str,
    db: Session = Depends(get_db),
    current_user: dict = Depends(get_current_user)
):
    """
    关闭支付订单

    用于订单超时未支付时关闭订单
    """
    try:
        order = order_crud.get_by_order_no(db, order_no)
        if not order:
            return error_response(404, "订单不存在")

        pay_status = getattr(order, "pay_status", None)
        if pay_status:
            if pay_status != "pending_payment":
                return error_response(400, "订单状态不允许关闭")
        elif order.status != "pending_payment":
            return error_response(400, "订单状态不允许关闭")

        # 调用微信支付关闭订单
        pay_client = get_wechat_pay_v2()
        out_trade_no = order.order_no
        result = pay_client.close_order(out_trade_no)

        if result.get("success"):
            return success_response({"message": "订单已关闭"})
        else:
            # 即使微信关闭失败，也更新本地订单状态
            order_crud.update_status(db, order.id, "cancelled", {
                "cancel_reason": "支付超时自动关闭"
            })
            return success_response({"message": "订单已关闭（本地）"})

    except Exception as e:
        return error_response(500, f"关闭订单失败: {str(e)}")


@router.get("/config", response_model=dict)
def get_pay_config(
    current_user: dict = Depends(get_current_user)
):
    """
    获取微信支付配置信息

    返回支付所需的AppID等配置（不含敏感信息）
    """
    return success_response({
        "appId": settings.WXPAY_MINI_APPID,
        "enabled": bool(settings.WXPAY_MCHID and settings.WXPAY_MINI_APPID)
    })