import { BadRequestException, Injectable, Logger, NotFoundException, Inject, forwardRef } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import type { CityWarehouse, FulfillmentProvider, Order } from '@prisma/client';
import { PrismaService } from '../../common/prisma/prisma.module';
import { CourierService } from '../../integrations/courier/courier.service';
import { CourierPayMode } from '../../integrations/courier/courier.types';
import { TradeService } from '../trade/trade.service';

export type ManualShipInput = {
  logisticsCompany: string;
  trackingNo: string;
  manualQueryUrl?: string;
};

export type HqLogisticsShipInput = ManualShipInput;

const XFX_CODES = new Set(['XFX', 'XIAOFEIXIA']);

@Injectable()
export class FulfillmentService {
  private readonly logger = new Logger(FulfillmentService.name);

  constructor(
    private readonly prisma: PrismaService,
    private readonly config: ConfigService,
    private readonly courier: CourierService,
    @Inject(forwardRef(() => TradeService))
    private readonly tradeService: TradeService,
  ) {}

  async dispatchAfterPay(orderId: bigint) {
    const order = await this.prisma.order.findUnique({
      where: { id: orderId },
      include: { delivery: true },
    });
    if (!order || order.payStatus !== 'PAID') return;

    if (order.deliveryType === 'CROSS_CITY') {
      await this.ensureDeliveryRecord(orderId, 'MANUAL');
      return;
    }

    const warehouse = await this.resolveWarehouseForLocalOrder(order.cityId);
    if (!warehouse) {
      await this.ensureDeliveryRecord(orderId, 'MANUAL');
      return;
    }

    await this.prisma.order.update({
      where: { id: orderId },
      data: { fulfillmentWarehouseId: warehouse.id },
    });

    if (warehouse.fulfillmentMode === 'MANUAL') {
      await this.ensureDeliveryRecord(orderId, 'MANUAL');
      return;
    }

    if (warehouse.fulfillmentMode === 'API_AUTO' && warehouse.fulfillmentProviderId) {
      const provider = await this.prisma.fulfillmentProvider.findUnique({
        where: { id: warehouse.fulfillmentProviderId },
      });
      if (!provider || provider.status !== 'ACTIVE' || provider.type !== 'API') {
        await this.ensureDeliveryRecord(orderId, 'MANUAL');
        return;
      }
      await this.dispatchApiAuto(order, warehouse, provider);
    }
  }

  async dispatchApiAuto(order: Order, warehouse: CityWarehouse, provider: FulfillmentProvider) {
    if (!XFX_CODES.has(provider.code)) {
      this.logger.warn(`承运商 ${provider.code} 自动推单尚未实现，订单 ${order.orderNo} 保持待发货`);
      await this.ensureDeliveryRecord(order.id, 'MANUAL', provider.id);
      return;
    }

    const defaults = this.getShipDefaults();
    const fromLng = warehouse.lng != null ? Number(warehouse.lng) : defaults.fromLng;
    const fromLat = warehouse.lat != null ? Number(warehouse.lat) : defaults.fromLat;

    try {
      const result = await this.courier.createShipment({
        outNumber: order.orderNo,
        from: {
          name: warehouse.contactName,
          mobile: warehouse.contactPhone,
          address: warehouse.address,
          addressDetail: warehouse.name,
          coordinate: { lng: fromLng, lat: fromLat },
        },
        to: {
          name: order.receiverName,
          mobile: order.receiverPhone,
          address: `${order.receiverProvince}${order.receiverCity}${order.receiverDistrict}`,
          addressDetail: order.receiverAddress,
        },
        goodsName: order.productName,
        goodsNum: order.quantity,
        weight: defaults.weight,
        payMode: defaults.payMode,
        remark: `仓配自动发货 ${order.orderNo}`,
      });

      const now = new Date();
      await this.prisma.$transaction(async (tx) => {
        const delivery = await tx.orderDelivery.findUnique({ where: { orderId: order.id } });
        const data = {
          provider: 'XFX' as const,
          fulfillmentProviderId: provider.id,
          trackingNo: result.trackingNumber,
          providerOrderNo: String(result.providerShipmentId),
          shippingAt: now,
        };
        if (delivery) {
          await tx.orderDelivery.update({ where: { orderId: order.id }, data });
        } else {
          await tx.orderDelivery.create({ data: { orderId: order.id, ...data } });
        }
        await tx.logThirdParty.create({
          data: {
            provider: 'XFX',
            scene: 'ORDER_DISPATCH',
            refType: 'ORDER',
            refId: order.id,
            externalNo: result.trackingNumber,
            status: 'SUCCESS',
          },
        });
      });

      await this.tradeService.applyStatusTransition(order.id, order.status, 'SHIPPING', 'WAREHOUSE_AUTO');
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err);
      await this.logDispatchFailure(order, provider, message);
      await this.ensureDeliveryRecord(order.id, 'MANUAL', provider.id);
    }
  }

  async shipManualByWarehouse(orderId: bigint, warehouseIds: bigint[], input: ManualShipInput) {
    const order = await this.prisma.order.findFirst({
      where: { id: orderId, fulfillmentWarehouseId: { in: warehouseIds } },
      include: { delivery: true },
    });
    if (!order) throw new NotFoundException('订单不存在或无权操作');
    if (!['PENDING_SHIP', 'OUT_WAREHOUSE'].includes(order.status)) {
      throw new BadRequestException('当前订单状态不可发货');
    }

    const queryUrl =
      input.manualQueryUrl?.trim() ||
      (await this.buildQueryUrlFromTemplate(order.fulfillmentWarehouseId, input.trackingNo));

    return this.applyManualShip(order, {
      logisticsCompany: input.logisticsCompany.trim(),
      trackingNo: input.trackingNo.trim(),
      manualQueryUrl: queryUrl,
      operator: 'WAREHOUSE_MANUAL',
    });
  }

  async shipHqLogistics(orderId: bigint, input: HqLogisticsShipInput) {
    const order = await this.prisma.order.findUnique({
      where: { id: orderId },
      include: { delivery: true },
    });
    if (!order) throw new NotFoundException('订单不存在');

    const isHqQueue =
      order.deliveryType === 'CROSS_CITY' ||
      (order.deliveryType === 'LOCAL' && !order.fulfillmentWarehouseId);

    if (!isHqQueue) throw new BadRequestException('该订单由仓配履约，请使用仓配发货');
    if (!['PENDING_SHIP', 'OUT_WAREHOUSE'].includes(order.status)) {
      throw new BadRequestException('当前订单状态不可发货');
    }
    if (order.delivery?.trackingNo) throw new BadRequestException('该订单已有运单号');

    return this.applyManualShip(order, {
      logisticsCompany: input.logisticsCompany.trim(),
      trackingNo: input.trackingNo.trim(),
      manualQueryUrl: input.manualQueryUrl?.trim(),
      operator: 'HQ_LOGISTICS',
      provider: 'LOGISTICS',
    });
  }

  async getOrderTrack(orderId: bigint) {
    const order = await this.prisma.order.findUnique({
      where: { id: orderId },
      include: { delivery: true },
    });
    if (!order?.delivery) {
      return { nodes: [], manualQueryUrl: null };
    }

    if (order.delivery.provider === 'XFX' && (order.delivery.trackingNo || order.orderNo)) {
      try {
        const nodes = await this.courier.getTrack({
          trackingNumber: order.delivery.trackingNo ?? undefined,
          outNumber: order.orderNo,
        });
        return {
          nodes,
          manualQueryUrl: order.delivery.manualQueryUrl,
          provider: order.delivery.provider,
          trackingNo: order.delivery.trackingNo,
          logisticsCompany: order.delivery.logisticsCompany,
        };
      } catch {
        // fall through to manual fields
      }
    }

    return {
      nodes: [],
      manualQueryUrl: order.delivery.manualQueryUrl,
      provider: order.delivery.provider,
      trackingNo: order.delivery.trackingNo,
      logisticsCompany: order.delivery.logisticsCompany,
    };
  }

  private async applyManualShip(
    order: Order & { delivery: { trackingNo: string | null } | null },
    input: ManualShipInput & { operator: string; provider?: 'MANUAL' | 'LOGISTICS' },
  ) {
    const now = new Date();
    const provider = input.provider ?? 'MANUAL';

    await this.prisma.$transaction(async (tx) => {
      const delivery = await tx.orderDelivery.findUnique({ where: { orderId: order.id } });
      const data = {
        provider,
        logisticsCompany: input.logisticsCompany,
        trackingNo: input.trackingNo,
        manualQueryUrl: input.manualQueryUrl || null,
        shippingAt: now,
      };
      if (delivery) {
        await tx.orderDelivery.update({ where: { orderId: order.id }, data });
      } else {
        await tx.orderDelivery.create({ data: { orderId: order.id, ...data } });
      }
    });

    await this.tradeService.applyStatusTransition(order.id, order.status, 'SHIPPING', input.operator);
    return this.prisma.order.findUnique({
      where: { id: order.id },
      include: { delivery: true, fulfillmentWarehouse: true },
    });
  }

  private async resolveWarehouseForLocalOrder(cityId: bigint) {
    return this.prisma.cityWarehouse.findFirst({
      where: { cityId, status: 'ACTIVE' },
      orderBy: { createdAt: 'asc' },
    });
  }

  private async ensureDeliveryRecord(
    orderId: bigint,
    provider: 'MANUAL' | 'LOGISTICS' | 'XFX',
    fulfillmentProviderId?: bigint,
  ) {
    const existing = await this.prisma.orderDelivery.findUnique({ where: { orderId } });
    if (existing) return;
    await this.prisma.orderDelivery.create({
      data: {
        orderId,
        provider,
        ...(fulfillmentProviderId ? { fulfillmentProviderId } : {}),
      },
    });
  }

  private async logDispatchFailure(order: Order, provider: FulfillmentProvider, error: string) {
    await this.prisma.logThirdParty.create({
      data: {
        provider: 'XFX',
        scene: 'ORDER_DISPATCH',
        refType: 'ORDER',
        refId: order.id,
        status: 'FAILED',
        errorMessage: `[${provider.code}] ${error}`.slice(0, 512),
      },
    });
  }

  private async buildQueryUrlFromTemplate(warehouseId: bigint | null, trackingNo: string) {
    if (!warehouseId) return undefined;
    const wh = await this.prisma.cityWarehouse.findUnique({ where: { id: warehouseId } });
    const tpl = wh?.manualQueryUrlTemplate;
    if (!tpl) return undefined;
    return tpl.replace(/\{trackingNo\}/g, encodeURIComponent(trackingNo));
  }

  private getShipDefaults() {
    return {
      fromLng: Number(this.config.get<string>('SHIP_FROM_LNG') || 113.665),
      fromLat: Number(this.config.get<string>('SHIP_FROM_LAT') || 34.757),
      weight: 2,
      payMode: CourierPayMode.SENDER,
    };
  }
}