import {
  BadRequestException,
  Body,
  Controller,
  Delete,
  HttpCode,
  Param,
  ParseUUIDPipe,
  Patch,
  Post,
  UploadedFile,
  UseInterceptors,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import {
  ApiBearerAuth,
  ApiBody,
  ApiConsumes,
  ApiCreatedResponse,
  ApiForbiddenResponse,
  ApiNoContentResponse,
  ApiNotFoundResponse,
  ApiOkResponse,
  ApiOperation,
  ApiTags,
  ApiUnauthorizedResponse,
} from '@nestjs/swagger';
import { CurrentUser } from '../../../common/decorators/current-user.decorator';
import { RequirePrivilege } from '../../../common/decorators/require-privilege.decorator';
import { BEARER_AUTH_NAME } from '../../../common/swagger/setup-swagger';
import { isAllowedCsvUpload } from './customer-fields';
import { CUSTOMER_PRIVILEGE_KEY } from './customers-read.controller';
import { CustomersService } from './customers.service';
import {
  BulkIdsDto,
  BulkStatusDto,
  CreateCustomerContactDto,
  CreateCustomerDto,
  CustomerDto,
  UpdateCustomerContactDto,
  UpdateCustomerDto,
  UpdateCustomerStatusDto,
} from './dto/customer.dto';

@ApiTags('customers')
@ApiBearerAuth(BEARER_AUTH_NAME)
@Controller('customers')
export class CustomersWriteController {
  constructor(private readonly customersService: CustomersService) {}

  @Post('import')
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'import')
  @UseInterceptors(
    FileInterceptor('file', {
      limits: { fileSize: 1_048_576 },
      fileFilter: (_req, file, cb) => {
        if (!isAllowedCsvUpload(file)) {
          cb(new BadRequestException('Only CSV files are allowed'), false);
          return;
        }
        cb(null, true);
      },
    }),
  )
  @ApiConsumes('multipart/form-data')
  @ApiBody({
    schema: {
      type: 'object',
      properties: {
        file: { type: 'string', format: 'binary' },
      },
      required: ['file'],
    },
  })
  @ApiOperation({ summary: 'Import customers from CSV' })
  @ApiOkResponse({
    schema: { properties: { imported: { type: 'number' } } },
  })
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  importCsv(
    @UploadedFile() file: { buffer?: Buffer } | undefined,
    @CurrentUser('id') userId: string,
  ): Promise<{ imported: number }> {
    const csv = file?.buffer?.toString('utf8') ?? '';
    return this.customersService.importCsv(csv, userId);
  }

  @Post('bulk-delete')
  @HttpCode(200)
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'delete')
  @ApiOperation({ summary: 'Bulk delete customers' })
  @ApiOkResponse({
    schema: { properties: { deleted: { type: 'number' } } },
  })
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  bulkDelete(@Body() dto: BulkIdsDto): Promise<{ deleted: number }> {
    return this.customersService.bulkDelete(dto.ids);
  }

  @Post('bulk-status')
  @HttpCode(200)
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'update')
  @ApiOperation({ summary: 'Bulk update customer status' })
  @ApiOkResponse({
    schema: { properties: { updated: { type: 'number' } } },
  })
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  bulkStatus(
    @Body() dto: BulkStatusDto,
    @CurrentUser('id') userId: string,
  ): Promise<{ updated: number }> {
    return this.customersService.bulkUpdateStatus(dto.ids, dto.status, userId);
  }

  @Post()
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'create')
  @ApiOperation({ summary: 'Create customer' })
  @ApiCreatedResponse({ type: CustomerDto })
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  create(
    @Body() dto: CreateCustomerDto,
    @CurrentUser('id') userId: string,
  ): Promise<CustomerDto> {
    return this.customersService.create({
      ...dto,
      userId,
    });
  }

  @Post(':id/contacts')
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'update')
  @ApiOperation({ summary: 'Add a customer contact' })
  @ApiOkResponse({ type: CustomerDto })
  @ApiNotFoundResponse()
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  addContact(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: CreateCustomerContactDto,
    @CurrentUser('id') userId: string,
  ): Promise<CustomerDto> {
    return this.customersService.addContact(id, dto, userId);
  }

  @Patch(':id/contacts/:contactId')
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'update')
  @ApiOperation({ summary: 'Update a customer contact' })
  @ApiOkResponse({ type: CustomerDto })
  @ApiNotFoundResponse()
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  updateContact(
    @Param('id', ParseUUIDPipe) id: string,
    @Param('contactId', ParseUUIDPipe) contactId: string,
    @Body() dto: UpdateCustomerContactDto,
    @CurrentUser('id') userId: string,
  ): Promise<CustomerDto> {
    return this.customersService.updateContact(id, contactId, {
      ...dto,
      userId,
    });
  }

  @Delete(':id/contacts/:contactId')
  @HttpCode(204)
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'update')
  @ApiOperation({ summary: 'Delete a customer contact' })
  @ApiNoContentResponse()
  @ApiNotFoundResponse()
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  async deleteContact(
    @Param('id', ParseUUIDPipe) id: string,
    @Param('contactId', ParseUUIDPipe) contactId: string,
  ): Promise<void> {
    await this.customersService.deleteContact(id, contactId);
  }

  @Patch(':id/status')
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'update')
  @ApiOperation({ summary: 'Update customer status' })
  @ApiOkResponse({ type: CustomerDto })
  @ApiNotFoundResponse()
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  updateStatus(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: UpdateCustomerStatusDto,
    @CurrentUser('id') userId: string,
  ): Promise<CustomerDto> {
    return this.customersService.updateStatus(id, dto.status, userId);
  }

  @Patch(':id')
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'update')
  @ApiOperation({ summary: 'Update customer (not status)' })
  @ApiOkResponse({ type: CustomerDto })
  @ApiNotFoundResponse()
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  update(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: UpdateCustomerDto,
    @CurrentUser('id') userId: string,
  ): Promise<CustomerDto> {
    return this.customersService.update(id, {
      ...dto,
      userId,
    });
  }

  @Delete(':id')
  @HttpCode(204)
  @RequirePrivilege(CUSTOMER_PRIVILEGE_KEY, 'delete')
  @ApiOperation({ summary: 'Delete customer' })
  @ApiNoContentResponse()
  @ApiNotFoundResponse()
  @ApiUnauthorizedResponse()
  @ApiForbiddenResponse()
  async delete(@Param('id', ParseUUIDPipe) id: string): Promise<void> {
    await this.customersService.delete(id);
  }
}