import { Controller, Headers, Inject, Post, Req, Res } from '@nestjs/common';
import type { Request, Response } from 'express';
import { TradeService } from '../modules/trade/trade.service';
import { WECHAT_PROVIDER } from '../integrations/integrations.constants';
import type { IWechatProvider } from '../integrations/wechat/wechat.interface';
import { PayRedeemAnomalyService } from '../common/alert/pay-redeem-anomaly.service';
import { AlertService } from '../common/alert/alert.service';

type RawBodyRequest = Request & { body: Buffer };

@Controller('callbacks/wechat')
export class WechatPayCallbackController {
  constructor(
    private readonly tradeService: TradeService,
    @Inject(WECHAT_PROVIDER) private readonly wechat: IWechatProvider,
    private readonly payRedeemAnomaly: PayRedeemAnomalyService,
    private readonly alert: AlertService,
  ) {}

  @Post('pay')
  async payNotify(
    @Req() req: RawBodyRequest,
    @Headers() headers: Record<string, string | string[] | undefined>,
    @Res() res: Response,
  ) {
    let orderNo: string | undefined;
    try {
      const rawBody =
        (req as Request & { rawBody?: Buffer }).rawBody?.toString('utf8') ??
        (typeof req.body === 'string' ? req.body : JSON.stringify(req.body ?? {}));
      const notify = await this.wechat.parsePayNotification(headers, rawBody);
      orderNo = notify.outTradeNo;
      await this.tradeService.handlePaySuccess({
        orderNo: notify.outTradeNo,
        transactionId: notify.transactionId,
        amountFen: notify.amountFen,
      });
      return res.status(200).json({ code: 'SUCCESS', message: '成功' });
    } catch (err) {
      const message = err instanceof Error ? err.message : '处理失败';
      this.payRedeemAnomaly.onPayFail(message, { orderNo });
      this.alert.notify({
        level: 'P0',
        category: 'pay',
        title: '支付回调处理失败',
        detail: `${orderNo ? `订单 ${orderNo}\n` : ''}${message}`,
        dedupeKey: `pay_callback_fail|${orderNo ?? message.slice(0, 40)}`,
        dedupeTtlSec: 120,
      });
      return res.status(500).json({ code: 'FAIL', message });
    }
  }
}