import { BadRequestException, Injectable } from '@nestjs/common';
import { CourierConfigService } from '../../integrations/courier/courier.config';
import type { XiaofeixiaConfig } from '../../integrations/courier/courier.config';
import { CourierApiError } from '../../integrations/courier/courier.error';
import { CourierService } from '../../integrations/courier/courier.service';
import { CourierPayMode } from '../../integrations/courier/courier.types';
import type {
  BatchShipmentQuery,
  CreateShipmentInput,
  ShipmentQuery,
} from '../../integrations/courier/courier.types';
import { FulfillmentProviderService } from '../fulfillment/fulfillment-provider.service';
import type {
  XiaofeixiaBatchShipmentQueryDto,
  XiaofeixiaCheckCoverageDto,
  XiaofeixiaCreateShipmentDto,
  XiaofeixiaEstimateFreightDto,
  XiaofeixiaShipmentQueryDto,
} from './dto/admin-courier.dto';

function maskSecret(value: string, visible = 4) {
  if (!value) return '';
  if (value.length <= visible) return '*'.repeat(value.length);
  return `${value.slice(0, visible)}${'*'.repeat(Math.min(8, value.length - visible))}`;
}

@Injectable()
export class AdminXiaofeixiaService {
  constructor(
    private readonly courier: CourierService,
    private readonly courierConfig: CourierConfigService,
    private readonly fulfillmentProviderService: FulfillmentProviderService,
  ) {}

  async getConfig() {
    const fromDb = await this.fulfillmentProviderService.resolveDefaultXiaofeixiaConfig();
    const envCfg = this.courierConfig.load().xiaofeixia;
    const xfx = fromDb ?? envCfg;
    return {
      provider: this.courierConfig.load().provider,
      activeProvider: this.courier.activeProvider,
      source: fromDb ? 'fulfillment_provider' : 'env',
      apiUrl: xfx.apiUrl,
      appId: xfx.appId ?? null,
      mchId: xfx.mchId || null,
      mchIdMasked: xfx.mchId ? maskSecret(xfx.mchId) : null,
      hasApiKey: Boolean(xfx.apiKey),
      signType: xfx.signType,
      ready: Boolean(xfx.mchId && xfx.apiKey && xfx.apiUrl),
      hint: fromDb
        ? '凭证来自仓配管理中启用的小飞侠承运商'
        : '未在仓配管理配置，回退到环境变量（请迁移至仓配管理）',
    };
  }

  async estimateFreight(dto: XiaofeixiaEstimateFreightDto) {
    const options = await this.callOptions();
    return this.wrap(() => this.courier.estimateFreight(dto.weight, options));
  }

  async checkCoverage(dto: XiaofeixiaCheckCoverageDto) {
    const options = await this.callOptions();
    return this.wrap(() => this.courier.checkDeliveryCoverage(dto.toAddress, options));
  }

  async createShipment(dto: XiaofeixiaCreateShipmentDto, xfxOverride?: XiaofeixiaConfig) {
    const input = this.mapCreateInput(dto);
    const options = xfxOverride
      ? { xiaofeixia: xfxOverride }
      : await this.callOptions();
    return this.wrap(() => this.courier.createShipment(input, options));
  }

  async cancelShipment(dto: XiaofeixiaShipmentQueryDto) {
    const query = this.mapShipmentQuery(dto);
    const options = await this.callOptions();
    return this.wrap(async () => {
      await this.courier.cancelShipment(query, options);
      return { cancelled: true };
    });
  }

  async getShipment(dto: XiaofeixiaShipmentQueryDto) {
    const query = this.mapShipmentQuery(dto);
    const options = await this.callOptions();
    return this.wrap(() => this.courier.getShipment(query, options));
  }

  async batchGetShipments(dto: XiaofeixiaBatchShipmentQueryDto) {
    const query: BatchShipmentQuery = {
      trackingNumbers: dto.trackingNumbers?.filter(Boolean),
      outNumbers: dto.outNumbers?.filter(Boolean),
    };
    const options = await this.callOptions();
    return this.wrap(() => this.courier.batchGetShipments(query, options));
  }

  async getTrack(dto: XiaofeixiaShipmentQueryDto) {
    const query = this.mapShipmentQuery(dto);
    const options = await this.callOptions();
    return this.wrap(() => this.courier.getTrack(query, options));
  }

  private async callOptions() {
    const fromDb = await this.fulfillmentProviderService.resolveDefaultXiaofeixiaConfig();
    return fromDb ? { xiaofeixia: fromDb } : undefined;
  }

  private mapShipmentQuery(dto: XiaofeixiaShipmentQueryDto): ShipmentQuery {
    if (!dto.trackingNumber && !dto.outNumber) {
      throw new BadRequestException('运单号与商家单号至少填一个');
    }
    return {
      trackingNumber: dto.trackingNumber,
      outNumber: dto.outNumber,
    };
  }

  private mapCreateInput(dto: XiaofeixiaCreateShipmentDto): CreateShipmentInput {
    const coord = (lng?: number, lat?: number) =>
      lng != null && lat != null ? { lng, lat } : undefined;

    return {
      outNumber: dto.outNumber,
      customerId: dto.customerId,
      from: {
        name: dto.fromName,
        mobile: dto.fromMobile,
        address: dto.fromAddress,
        addressDetail: dto.fromAddressDetail,
        coordinate: coord(dto.fromLng, dto.fromLat),
      },
      to: {
        name: dto.toName,
        mobile: dto.toMobile,
        address: dto.toAddress,
        addressDetail: dto.toAddressDetail,
        coordinate: coord(dto.toLng, dto.toLat),
      },
      goodsName: dto.goodsName,
      goodsNum: dto.goodsNum,
      weight: dto.weight,
      insuredSumPrice: dto.insuredSumPrice,
      collectionPrice: dto.collectionPrice,
      payMode: dto.payMode as CourierPayMode,
      remark: dto.remark,
    };
  }

  private async wrap<T>(fn: () => Promise<T>) {
    const startedAt = Date.now();
    try {
      const data = await fn();
      return {
        ok: true,
        elapsedMs: Date.now() - startedAt,
        data,
      };
    } catch (err) {
      if (err instanceof CourierApiError) {
        return {
          ok: false,
          elapsedMs: Date.now() - startedAt,
          error: err.message,
          code: err.code,
          provider: err.providerCode,
          raw: err.raw,
        };
      }
      const message = err instanceof Error ? err.message : String(err);
      return {
        ok: false,
        elapsedMs: Date.now() - startedAt,
        error: message,
      };
    }
  }
}