import { Injectable } from '@nestjs/common';
import { PrismaService } from '../common/prisma/prisma.module';
import { CourierService } from '../integrations/courier/courier.service';
import { XiaofeixiaProvider } from '../integrations/courier/xiaofeixia/xiaofeixia.provider';
import { logCourierCall } from '../integrations/courier/courier-log.util';
import { TradeService } from '../modules/trade/trade.service';

const XFX_PROVIDER_ALIASES = new Set(['xfx', 'xiaofeixia']);
const RAW_BODY_LOG_LIMIT = 4000;

export type TrackCallbackRequestMeta = {
  contentType?: string | null;
  rawBody?: string | null;
  query?: Record<string, unknown>;
};

@Injectable()
export class DeliveryCallbackService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly courier: CourierService,
    private readonly xiaofeixiaProvider: XiaofeixiaProvider,
    private readonly tradeService: TradeService,
  ) {}

  async handleTrackCallback(
    providerKey: string,
    body: unknown,
    requestUrl: string,
    meta?: TrackCallbackRequestMeta,
  ) {
    const normalized = providerKey.trim().toLowerCase();
    const baseLog = {
      scene: 'TRACK_CALLBACK',
      requestUrl,
      requestBody: this.buildRequestBodyForLog(body, meta),
    };

    if (!XFX_PROVIDER_ALIASES.has(normalized) && normalized !== 'logistics') {
      await logCourierCall(this.prisma, {
        ...baseLog,
        status: 'FAILED',
        errorMessage: `不支持的承运商: ${providerKey}`,
      });
      return this.courier.buildTrackCallbackResponse(false);
    }

    if (normalized === 'logistics') {
      await logCourierCall(this.prisma, {
        ...baseLog,
        status: 'SUCCESS',
        errorMessage: '跨城物流回调暂未接入，已记录',
      });
      return this.courier.buildTrackCallbackResponse(true);
    }

    const payload = this.xiaofeixiaProvider.parseTrackCallback(body);
    if (!payload) {
      const response = this.courier.buildTrackCallbackResponse(false);
      await logCourierCall(this.prisma, {
        ...baseLog,
        responseBody: response,
        status: 'FAILED',
        errorMessage: '回调体解析失败',
      });
      return response;
    }

    const order = payload.outNumber
      ? await this.prisma.order.findUnique({ where: { orderNo: payload.outNumber } })
      : payload.trackingNumber
        ? await this.prisma.order.findFirst({
            where: { delivery: { trackingNo: payload.trackingNumber } },
          })
        : null;

    if (!order) {
      const response = this.courier.buildTrackCallbackResponse(false);
      await logCourierCall(this.prisma, {
        ...baseLog,
        responseBody: response,
        status: 'FAILED',
        errorMessage: '订单不存在',
        externalNo: payload.outNumber || payload.trackingNumber,
      });
      return response;
    }

    const targetStatus = this.xiaofeixiaProvider.mapTrackStatus(
      payload.status,
      payload.statusName,
    );
    let applied = false;
    if (targetStatus && targetStatus !== order.status) {
      await this.tradeService.applyStatusTransition(
        order.id,
        order.status,
        targetStatus,
        'COURIER_TRACK_CALLBACK',
        payload.trackInfo || payload.statusName,
      );
      applied = true;
    }

    const response = this.courier.buildTrackCallbackResponse(true);
    await logCourierCall(this.prisma, {
      ...baseLog,
      responseBody: response,
      status: 'SUCCESS',
      externalNo: order.orderNo,
      ref: { refType: 'ORDER', refId: order.id },
      errorMessage: applied ? undefined : '状态未变更',
    });

    return response;
  }

  /** 第三方日志：保留解析后字段，并附带 Content-Type / rawBody / query 便于排查空 body */
  private buildRequestBodyForLog(
    body: unknown,
    meta?: TrackCallbackRequestMeta,
  ): Record<string, unknown> {
    const parsed =
      body && typeof body === 'object'
        ? ({ ...(body as Record<string, unknown>) } as Record<string, unknown>)
        : body === undefined || body === null
          ? {}
          : { value: body };

    const rawBody = meta?.rawBody != null ? this.redactSecrets(String(meta.rawBody)) : null;
    const query =
      meta?.query && Object.keys(meta.query).length > 0
        ? this.redactSecretFields({ ...meta.query })
        : undefined;

    return {
      ...this.redactSecretFields(parsed),
      _meta: {
        contentType: meta?.contentType ?? null,
        rawBody:
          rawBody && rawBody.length > RAW_BODY_LOG_LIMIT
            ? `${rawBody.slice(0, RAW_BODY_LOG_LIMIT)}…(truncated)`
            : rawBody,
        rawBodyLength: meta?.rawBody != null ? Buffer.byteLength(meta.rawBody, 'utf8') : 0,
        query,
      },
    };
  }

  private redactSecretFields(input: Record<string, unknown>): Record<string, unknown> {
    const out: Record<string, unknown> = {};
    for (const [key, value] of Object.entries(input)) {
      if (/^sign$/i.test(key) || /api[_-]?key/i.test(key)) {
        out[key] = '[REDACTED]';
      } else if (key === 'mchId' && value != null) {
        const s = String(value);
        out[key] = s.length <= 4 ? '****' : `${s.slice(0, 4)}****`;
      } else {
        out[key] = value;
      }
    }
    return out;
  }

  private redactSecrets(raw: string): string {
    return raw
      .replace(/(sign=)[^&\s]*/gi, '$1[REDACTED]')
      .replace(/("sign"\s*:\s*")[^"]*/gi, '$1[REDACTED]')
      .replace(/(api[_-]?key=)[^&\s]*/gi, '$1[REDACTED]');
  }
}