import { Injectable } from '@nestjs/common';
import { CourierApiError } from '../courier.error';
import { CourierConfigService } from '../courier.config';
import { PrismaService } from '../../../common/prisma/prisma.module';
import {
  logCourierCall,
  resolveOrderRefByOutNumber,
  sanitizeXfxRequestBody,
  sceneForXfxCmd,
} from '../courier-log.util';
import { buildXiaofeixiaSign } from './xiaofeixia.sign';
import { XIAOFEIXIA_SUCCESS_CODE } from './xiaofeixia.constants';
import type { XiaofeixiaApiResponse } from './xiaofeixia.types';

type RequestParams = Record<string, string | number | undefined>;

@Injectable()
export class XiaofeixiaClient {
  constructor(
    private readonly courierConfig: CourierConfigService,
    private readonly prisma: PrismaService,
  ) {}

  async request<T>(cmd: string, bizParams: RequestParams): Promise<T> {
    const cfg = this.courierConfig.load().xiaofeixia;
    const scene = sceneForXfxCmd(cmd);
    const externalNo = this.pickExternalNo(bizParams);

    if (!cfg.mchId || !cfg.apiKey) {
      await logCourierCall(this.prisma, {
        scene,
        requestUrl: cfg.apiUrl || '(未配置)',
        requestBody: sanitizeXfxRequestBody({ cmd, ...bizParams, mchId: cfg.mchId }),
        status: 'FAILED',
        errorMessage: '小飞侠商户配置不完整',
        externalNo,
      });
      throw new CourierApiError(
        '小飞侠商户配置不完整，请设置 XIAOFEIXIA_MCH_ID 与 XIAOFEIXIA_API_KEY',
        'CONFIG_ERROR',
        'XIAOFEIXIA',
      );
    }

    const baseParams: RequestParams = {
      mchId: cfg.mchId,
      cmd,
      signType: cfg.signType,
      ...bizParams,
    };

    if (cfg.appId) {
      baseParams.appId = cfg.appId;
    }

    const sign = buildXiaofeixiaSign(baseParams, cfg.apiKey, cfg.signType);
    const body = new URLSearchParams();

    for (const [key, value] of Object.entries({ ...baseParams, sign })) {
      if (value !== undefined && value !== null && value !== '') {
        body.append(key, String(value));
      }
    }

    const logRequestBody = sanitizeXfxRequestBody({ ...baseParams, sign: '[REDACTED]' });
    const orderRef = await resolveOrderRefByOutNumber(
      this.prisma,
      typeof bizParams.outNumber === 'string' ? bizParams.outNumber : undefined,
    );

    let response: Response;
    try {
      response = await fetch(cfg.apiUrl, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: body.toString(),
      });
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error);
      await logCourierCall(this.prisma, {
        scene,
        requestUrl: cfg.apiUrl,
        requestBody: logRequestBody,
        status: 'FAILED',
        errorMessage: `网络异常: ${message}`,
        externalNo,
        ref: orderRef,
      });
      throw new CourierApiError('小飞侠接口网络异常', '200000', 'XIAOFEIXIA', error);
    }

    const rawText = await response.text();

    if (!response.ok) {
      await logCourierCall(this.prisma, {
        scene,
        requestUrl: cfg.apiUrl,
        requestBody: logRequestBody,
        responseBody: { httpStatus: response.status, body: rawText.slice(0, 500) },
        status: 'FAILED',
        errorMessage: `HTTP ${response.status}`,
        externalNo,
        ref: orderRef,
      });
      throw new CourierApiError(
        `小飞侠 HTTP 请求失败: ${response.status}`,
        '200000',
        'XIAOFEIXIA',
      );
    }

    let payload: XiaofeixiaApiResponse<T>;
    try {
      payload = rawText
        ? (JSON.parse(rawText) as XiaofeixiaApiResponse<T>)
        : (null as unknown as XiaofeixiaApiResponse<T>);
    } catch {
      await logCourierCall(this.prisma, {
        scene,
        requestUrl: cfg.apiUrl,
        requestBody: logRequestBody,
        responseBody: { raw: rawText.slice(0, 500) },
        status: 'FAILED',
        errorMessage: '响应非 JSON',
        externalNo,
        ref: orderRef,
      });
      throw new CourierApiError(
        `小飞侠响应非 JSON（HTTP ${response.status}）: ${rawText.slice(0, 200) || '(空)'}`,
        '200000',
        'XIAOFEIXIA',
        rawText,
      );
    }

    if (!payload) {
      await logCourierCall(this.prisma, {
        scene,
        requestUrl: cfg.apiUrl,
        requestBody: logRequestBody,
        status: 'FAILED',
        errorMessage: '小飞侠返回空响应',
        externalNo,
        ref: orderRef,
      });
      throw new CourierApiError('小飞侠返回空响应', '200000', 'XIAOFEIXIA');
    }

    if (payload.code !== XIAOFEIXIA_SUCCESS_CODE) {
      await logCourierCall(this.prisma, {
        scene,
        requestUrl: cfg.apiUrl,
        requestBody: logRequestBody,
        responseBody: payload as unknown as Record<string, unknown>,
        status: 'FAILED',
        errorMessage: payload.message || '业务失败',
        externalNo: externalNo || payload.data?.toString(),
        ref: orderRef,
      });
      throw new CourierApiError(
        payload.message || '小飞侠接口业务失败',
        payload.code,
        'XIAOFEIXIA',
        payload,
      );
    }

    await logCourierCall(this.prisma, {
      scene,
      requestUrl: cfg.apiUrl,
      requestBody: logRequestBody,
      responseBody: payload as unknown as Record<string, unknown>,
      status: 'SUCCESS',
      externalNo: externalNo || this.pickExternalNoFromData(payload.data),
      ref: orderRef,
    });

    return payload.data as T;
  }

  private pickExternalNo(params: RequestParams) {
    const outNumber = params.outNumber != null ? String(params.outNumber) : undefined;
    const number = params.number != null ? String(params.number) : undefined;
    return outNumber || number;
  }

  private pickExternalNoFromData(data: unknown) {
    if (!data || typeof data !== 'object') return undefined;
    const row = data as { number?: string; outNumber?: string; id?: string };
    return row.number || row.outNumber || row.id;
  }
}