edr-platform/apps/edr-freight-api/src/modules/last-mile/last-mile.service.ts

import { Injectable, Logger, NotFoundException } from '@nestjs/common';
import { DataSource, FindOptionsWhere } from 'typeorm';

import { BookingsRepository } from '../bookings/bookings.repository';
import { DriversService } from '../drivers/drivers.service';
import { SmsClientService } from '../notifications/sms-client.service';
import { VehiclesService } from '../vehicles/vehicles.service';
import { CreateLastMileDto } from './dto/create-last-mile.dto';
import { UpdateLastMileDto } from './dto/update-last-mile.dto';
import { LastMile, LastMileStatus } from './entities/last-mile.entity';
import { LastMileContainerAllocation } from './entities/last-mile-container-allocation.entity';
import { LastMileRepository } from './last-mile.repository';
import { InvoiceEventPayload } from '../billing/billing.service';
import { OnEvent } from '@nestjs/event-emitter';

type LastMileListFilter = {
  status?: LastMileStatus;
  bookingId?: string;
  vehicleId?: string;
  page?: number;
  pageSize?: number;
  sortBy?: string;
  sortOrder?: string;
};

const SORTABLE_FIELDS: (keyof LastMile)[] = [
  'status',
  'advancedPayment',
  'remainingPayment',
  'createdAt',
];

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

  constructor(
    private readonly lastMileRepository: LastMileRepository,
    private readonly bookingsRepository: BookingsRepository,
    private readonly vehiclesService: VehiclesService,
    private readonly driversService: DriversService,
    private readonly smsClient: SmsClientService,
    private readonly dataSource: DataSource,
  ) {}

  async acceptBooking(bookingReference: string): Promise<LastMile | null> {
    const booking = await this.bookingsRepository.findByReference(bookingReference);

    if (!booking) {
      return null;
    }

    if (booking.paymentStatus !== 'PAID') {
       return null;
    }

    return this.create({
      bookingId: booking.id,
      advancedPayment: 0,
    });
  }

    async acceptBookingByReference(bookingReference: string): Promise<LastMile | null> {
    const booking = await this.bookingsRepository.findByReference(bookingReference);

    if (!booking) {
      return null;
    }

    if (booking.paymentStatus !== 'PAID') {
            return null;
    }

    return this.create({
      bookingId: booking.id,
      advancedPayment: 0,
    });
  }

  async findAll(filter: LastMileListFilter = {}): Promise<{
    data: LastMile[];
    meta: { total: number; page: number; pageSize: number; totalPages: number };
  }> {
    const page = filter.page ?? 1;
    const pageSize = filter.pageSize ?? 50;
    const sortBy = SORTABLE_FIELDS.includes(filter.sortBy as keyof LastMile)
      ? (filter.sortBy as keyof LastMile)
      : 'createdAt';
    const sortOrder = filter.sortOrder?.toUpperCase() === 'ASC' ? 'ASC' : 'DESC';

    const where: FindOptionsWhere<LastMile> = {};
    if (filter.status) where.status = filter.status;
    if (filter.bookingId) where.bookingId = filter.bookingId;
    if (filter.vehicleId) where.vehicleId = filter.vehicleId;

    const [data, total] = await this.lastMileRepository.findAndCount({
      where,
      relations: {
        booking: { company: true, serviceType: true, originYard: true, destinationYard: true, cargoType: true },
        vehicle: true,
      },
      order: { [sortBy]: sortOrder },
      skip: (page - 1) * pageSize,
      take: pageSize,
    });

    return {
      data,
      meta: {
        total,
        page,
        pageSize,
        totalPages: Math.max(1, Math.ceil(total / pageSize)),
      },
    };
  }

  async findById(id: string): Promise<LastMile> {
    const record = await this.lastMileRepository.findById(id, {
      relations: {
        booking: { company: true, serviceType: true, originYard: true, destinationYard: true, cargoType: true },
        vehicle: true,
      },
    });

    if (!record) {
      throw new NotFoundException(`Last-mile record ${id} not found`);
    }

    return record;
  }

  async create(dto: CreateLastMileDto): Promise<LastMile> {
    const [existing] = await this.lastMileRepository.findAll({
      where: { bookingId: dto.bookingId },
      take: 1,
    });
    if (existing) return existing;

    return this.lastMileRepository.create({
      bookingId: dto.bookingId,
      status: dto.status ?? 'READY_TO_TRANSIT',
      advancedPayment: dto.advancedPayment ?? 0,
      remainingPayment: dto.remainingPayment ?? 0,
      estimatedKm: dto.estimatedKm ?? null,
      exactKm: dto.exactKm ?? null,
      vehicleId: dto.vehicleId ?? null,
      paid: (dto as any).paid ?? false,
    });
  }

  @OnEvent("lastmile.invoice.paid")
  async onBookingInvoicePaid(payload: InvoiceEventPayload): Promise<void> {
    try {
      await this.lastMileRepository.update(payload.sourceId, { paid: true } as any);
      this.logger.log(`Marked last-mile record ${payload.sourceId} as paid (invoice ${payload.invoiceId})`);
    } catch (err) {
      this.logger.error(
        `Failed to update last-mile payment status for record ${payload.sourceId}: ${String(err)}`,
      );
    }
  }

  async update(id: string, dto: UpdateLastMileDto): Promise<LastMile> {
    const existing = await this.findById(id);

    const dtoAny = dto as any;
    const updated = await this.lastMileRepository.update(id, {
      ...(dto.bookingId !== undefined ? { bookingId: dto.bookingId } : {}),
      ...(dto.status !== undefined ? { status: dto.status } : {}),
      ...(dto.advancedPayment !== undefined ? { advancedPayment: dto.advancedPayment } : {}),
      ...(dto.remainingPayment !== undefined ? { remainingPayment: dto.remainingPayment } : {}),
      ...(dto.estimatedKm !== undefined ? { estimatedKm: dto.estimatedKm } : {}),
      ...(dto.exactKm !== undefined ? { exactKm: dto.exactKm } : {}),
      ...(dto.vehicleId !== undefined ? { vehicleId: dto.vehicleId } : {}),
      ...(dtoAny.paid !== undefined ? { paid: dtoAny.paid } : {}),
    } as any);

    if (!updated) {
      throw new NotFoundException(`Last-mile record ${id} not found`);
    }

    // Notify assigned driver on every explicit vehicle assignment or reassignment
    if (dto.vehicleId) {
      void this.notifyDriverAssignment(dto.vehicleId, existing);
    }

    return updated;
  }

  private async notifyDriverAssignment(vehicleId: string, record: LastMile): Promise<void> {
    try {
      const vehicle = await this.vehiclesService.findById(vehicleId);
      if (!vehicle.assignedDriverId) {
        this.logger.warn(`Vehicle ${vehicleId} has no assigned driver — skipping SMS`);
        return;
      }

      const driver = await this.driversService.findById(vehicle.assignedDriverId);
      if (!driver.phoneNumber) {
        this.logger.warn(`Driver ${vehicle.assignedDriverId} has no phone number — skipping SMS`);
        return;
      }

      type BookingWithYards = {
        reference?: string;
        lastMileDeliveryAddress?: string | null;
        destinationYard?: { label?: string } | null;
      };
      const booking = (record as LastMile & { booking?: BookingWithYards }).booking;

      const driverName = `${driver.firstName ?? ''} ${driver.lastName ?? ''}`.trim();
      const message =
        `Dear ${driverName}, you have been assigned to a last-mile delivery. ` +
        `Booking: ${booking?.reference ?? record.bookingId}. Vehicle: ${vehicle.plateNumber ?? vehicleId}. ` +
        (booking?.destinationYard?.label ? `Pickup: ${booking.destinationYard.label}. ` : '') +
        (booking?.lastMileDeliveryAddress ? `Destination: ${booking.lastMileDeliveryAddress}.` : '');

      void this.smsClient.sendSms({
        to: driver.phoneNumber,
        message,
      });

      this.logger.log(`SMS queued to driver ${driver.phoneNumber} for vehicle ${vehicleId} assignment`);
    } catch (err) {
      this.logger.error(`Failed to notify driver for vehicle ${vehicleId}: ${String(err)}`);
    }
  }

  async remove(id: string): Promise<void> {
    await this.findById(id);
    await this.lastMileRepository.softDelete(id);
  }

  async allocateContainers(
    lastMileId: string,
    allocations: Array<{ containerId: string; vehicleId: string }>,
  ) {
    const lastMile = await this.findById(lastMileId);
    if (!lastMile) {
      throw new NotFoundException(`Last-mile record ${lastMileId} not found`);
    }

    await this.dataSource.transaction(async (manager) => {
      for (const allocation of allocations) {
        await manager.delete(LastMileContainerAllocation, {
          lastMileId,
          containerId: allocation.containerId,
        });
        await manager.insert(LastMileContainerAllocation, {
          lastMileId,
          containerId: allocation.containerId,
          vehicleId: allocation.vehicleId,
          containerType: 'CONTAINER',
          quantity: 1,
        });
      }
    });

    return {
      success: true,
      allocated: allocations.length,
    };
  }
}