"""
支付 API：创建订单、异步通知、状态查询

遵循 BACKEND_DEV.md 规范：router 只做参数校验、调用 service、返回统一响应
"""
from fastapi import APIRouter, HTTPException, Request, status
from fastapi.responses import PlainTextResponse

from app.core.response import success_response
from .schemas import CreateOrderRequest, CreateOrderResponse, OrderStatusResponse
from . import service

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


@router.post("/create-order")
async def create_payment_order(request: CreateOrderRequest):
    """创建支付宝电脑网站支付订单，返回收银台 URL"""
    try:
        result = service.create_payment_order(request.payment_token)
    except ValueError as e:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail=str(e))
    except RuntimeError as e:
        raise HTTPException(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e))

    return success_response(
        CreateOrderResponse(**result).model_dump()
    )


@router.post("/notify")
async def payment_notify(request: Request):
    """
    支付宝异步通知回调

    必须返回纯文本 "success"（不是 JSON），否则支付宝会重复推送。
    """
    form_data = await request.form()
    verified = service.handle_payment_notify(dict(form_data))
    return PlainTextResponse("success" if verified else "fail")


@router.get("/status/{out_trade_no}")
async def check_payment_status(out_trade_no: str):
    """查询订单支付状态（前端轮询）"""
    order_status = service.get_order_status(out_trade_no)
    if order_status is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="订单不存在")

    return success_response(
        OrderStatusResponse(status=order_status).model_dump()
    )