import {
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  HttpStatus,
  Param,
  ParseUUIDPipe,
  Patch,
  Post,
  Query,
} from '@nestjs/common';
import { ApiBearerAuth, ApiOperation, ApiTags } from '@nestjs/swagger';

import { TrainSchedulingManage, TrainSchedulingView } from '../../common/booking-guards';

import { CreateLastMileDto } from './dto/create-last-mile.dto';
import { UpdateLastMileDto } from './dto/update-last-mile.dto';
import { AllocateLastMileContainersDto } from './dto/allocate-containers.dto';
import { SetVehiclesDto } from './dto/set-vehicles.dto';
import { LastMileStatus } from './entities/last-mile.entity';
import { LastMileService } from './last-mile.service';
import { LastMileInvoiceService } from './last-mile-invoice.service';
import { Freight } from '@edr/types';
import { BillingService } from '../billing/billing.service';
import { BookingsService } from '../bookings/bookings.service';

@ApiTags('last-mile')
@ApiBearerAuth()
@Controller('last-mile')
@TrainSchedulingView()
export class LastMileController {
  constructor(
    private readonly lastMileService: LastMileService,
    private readonly lastMileInvoiceService: LastMileInvoiceService,
    private readonly billingService: BillingService,
    private readonly bookingsService: BookingsService
  ) {}

  @Get()
  @ApiOperation({ summary: 'List last-mile legs' })
  findAll(
    @Query('status') status?: string,
    @Query('bookingId') bookingId?: string,
    @Query('vehicleId') vehicleId?: string,
    @Query('page') page?: string,
    @Query('pageSize') pageSize?: string,
    @Query('sortBy') sortBy?: string,
    @Query('sortOrder') sortOrder?: 'ASC' | 'DESC',
  ) {
    return this.lastMileService.findAll({
      status: status as LastMileStatus | undefined,
      bookingId,
      vehicleId,
      page: page ? parseInt(page, 10) : undefined,
      pageSize: pageSize ? parseInt(pageSize, 10) : undefined,
      sortBy,
      sortOrder,
    });
  }

  @Get(':id')
  @ApiOperation({ summary: 'Get a last-mile leg by ID' })
  findOne(@Param('id', ParseUUIDPipe) id: string) {
    return this.lastMileService.findById(id);
  }

  @Post('accept/:reference')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Accept a paid booking and create a last-mile leg' })
  acceptBooking(@Param('reference') reference: string) {
    return this.lastMileService.acceptBookingByReference(reference);
  }

  @Post()
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Create a last-mile leg' })
  create(@Body() dto: CreateLastMileDto) {
    return this.lastMileService.create(dto);
  }

  @Patch(':id')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Update a last-mile leg' })
  async update(@Param('id', ParseUUIDPipe) id: string, @Body() dto: UpdateLastMileDto) {
    const record = await this.lastMileService.update(id, dto);
    // Auto-generate invoice if distance or payment was updated
      const booking  = await this.bookingsService.findById(record.bookingId);
      const currency = booking.paymentCurrency || "ETB";
        if (dto.exactKm !== undefined || dto.exactKm != record.exactKm || dto.remainingPayment !== undefined || dto.remainingPayment !== record.remainingPayment) {
        await this.billingService.generateInvoice({
          source: Freight.InvoiceSource.LastMile,
          sourceId: record.id,
          type: "LAST_MILE",
          companyId: booking.companyId,
          companyProfileId: booking.companyProfileId,
          currency,

          lines: [
            {
              chargeType: "LAST_MILE",
              description: "Last Mile Transportation Service",
              quantity: 1,
              unitRate: record.remainingPayment,
              amount: record.remainingPayment,
              currency,
            },
          ],
    
          subtotalAmount: record.remainingPayment,
          taxAmount: 0, // Replace if VAT/tax applies
          totalAmount: record.remainingPayment,
    
          dueInDays: 7,
          status: Freight.InvoiceStatus.Pending,
        });
         await this.lastMileInvoiceService.ensureInvoiceFor(record);
        }
    return record;
  }

  @Delete(':id')
  @TrainSchedulingManage()
  @HttpCode(HttpStatus.NO_CONTENT)
  @ApiOperation({ summary: 'Soft-delete a last-mile leg' })
  remove(@Param('id', ParseUUIDPipe) id: string) {
    return this.lastMileService.remove(id);
  }

  @Post(':id/allocate-containers')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Allocate containers to vehicles' })
  async allocateContainers(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: AllocateLastMileContainersDto,
  ) {
    return this.lastMileService.allocateContainers(id, dto.allocations);
  }

  @Post(':id/vehicles')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Set the vehicles assigned to a last-mile delivery (multi-truck)' })
  async setVehicles(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: SetVehiclesDto,
  ) {
    return this.lastMileService.setVehicles(id, dto.vehicleIds);
  }
}