import {
  Controller,
  Get,
  Post,
  Patch,
  Delete,
  Body,
  Param,
  Query,
  UseGuards,
  UseInterceptors,
  UploadedFile,
  BadRequestException,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import { ApiTags, ApiBearerAuth, ApiOperation, ApiConsumes } from '@nestjs/swagger';
import { TransportersService } from './transporters.service';
import { CreateTransporterDto } from './dto/create-transporter.dto';
import { UpdateTransporterDto } from './dto/update-transporter.dto';
import { CombinedAuthGuard } from '../auth/guards/combined-auth.guard';
import { RolesGuard } from '../auth/guards/roles.guard';
import { Roles } from '../auth/decorators/roles.decorator';
import { CurrentUser } from '../auth/decorators/current-user.decorator';
import { ApiPagination } from '../common/decorators/api-pagination.decorator';
import { PaginationParams } from '../common/utils/pagination.util';

/**
 * Carrier (transporter) records describe sub-contracted fleet operators.
 * Adding/editing them is an admin-only operation because it affects
 * billing relationships and vehicle ownership.
 */
const CARRIER_WRITERS = ['SUPER_ADMIN', 'ADMIN', 'OPERATIONS_MANAGER'] as const;

@ApiTags('Transporters')
@ApiBearerAuth()
@UseGuards(CombinedAuthGuard, RolesGuard)
@Controller('transporters')
export class TransportersController {
  constructor(private readonly transportersService: TransportersService) {}

  @Post()
  @Roles(...CARRIER_WRITERS)
  @ApiOperation({ summary: 'Create a new carrier' })
  async create(
    @CurrentUser('organizationId') orgId: string,
    @CurrentUser('id') userId: string,
    @Body() dto: CreateTransporterDto,
  ) {
    return this.transportersService.create(orgId, dto, userId);
  }

  @Get()
  @ApiPagination()
  @ApiOperation({ summary: 'List all carriers (org-scoped)' })
  async findAll(
    @CurrentUser('organizationId') orgId: string,
    @Query() query: PaginationParams,
  ) {
    return this.transportersService.findAll(orgId, query);
  }

  @Get(':id')
  @ApiOperation({ summary: 'Get carrier by ID (org-scoped)' })
  async findOne(
    @CurrentUser('organizationId') orgId: string,
    @Param('id') id: string,
  ) {
    return this.transportersService.findOne(orgId, id);
  }

  @Patch(':id')
  @Roles(...CARRIER_WRITERS)
  @ApiOperation({ summary: 'Update a carrier (org-scoped)' })
  async update(
    @CurrentUser('organizationId') orgId: string,
    @Param('id') id: string,
    @CurrentUser('id') userId: string,
    @Body() dto: UpdateTransporterDto,
  ) {
    return this.transportersService.update(orgId, id, dto, userId);
  }

  @Delete(':id')
  @Roles(...CARRIER_WRITERS)
  @ApiOperation({ summary: 'Delete a carrier (blocked when vehicles still belong)' })
  async remove(
    @CurrentUser('organizationId') orgId: string,
    @Param('id') id: string,
  ) {
    return this.transportersService.remove(orgId, id);
  }

  @Post('upload')
  @Roles(...CARRIER_WRITERS)
  @ApiOperation({ summary: 'Bulk upload carriers from Excel/CSV' })
  @ApiConsumes('multipart/form-data')
  @UseInterceptors(FileInterceptor('file', { limits: { fileSize: 10 * 1024 * 1024 } }))
  async bulkUpload(
    @CurrentUser('organizationId') orgId: string,
    @UploadedFile() file: Express.Multer.File,
  ) {
    if (!file) throw new BadRequestException('No file uploaded');
    return this.transportersService.bulkUploadFromFile(orgId, file);
  }
}