import {
  BadRequestException,
  Body,
  Controller,
  Get,
  Param,
  Post,
  Query,
  Res,
  UploadedFile,
  UseInterceptors,
  UsePipes,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import { ApiTags } from '@nestjs/swagger';
import { CurrentSessionUserId } from '../auth/current-session-user.decorator';
import { FilesService } from './files.service';
import { strictValidationPipe } from '../common/strict-validation.pipe';
import { ClientFileUploadDto } from './client-files.dto';

type UploadedMultipartFile = { originalname: string; mimetype: string; size: number; buffer: Buffer };
type DownloadResponse = { setHeader(name: string, value: number | string): void; send(content: Buffer): void };

@ApiTags('client-files')
@Controller('client/files')
export class ClientFilesController {
  constructor(private readonly files: FilesService) {}

  @Post('upload')
  @UseInterceptors(FileInterceptor('file', { limits: { fileSize: 10 * 1024 * 1024, files: 1, fields: 4, parts: 5 } }))
  @UsePipes(strictValidationPipe)
  upload(
    @CurrentSessionUserId() userId: string | undefined,
    @UploadedFile() file: UploadedMultipartFile,
    @Body() body: ClientFileUploadDto,
  ) {
    if (!file) throw new BadRequestException('Upload file is required');
    return this.files.uploadForClient(userId, body, file);
  }

  @Get(':id/download')
  async download(
    @CurrentSessionUserId() userId: string | undefined,
    @Param('id') id: string,
    @Query('disposition') disposition: string | undefined,
    @Res() response: DownloadResponse,
  ) {
    const { fileObject, content } = await this.files.getClientDownload(userId, id);
    const mode = disposition === 'inline' ? 'inline' : 'attachment';
    response.setHeader('Content-Type', fileObject.contentType || 'application/octet-stream');
    response.setHeader('Content-Length', content.length);
    response.setHeader('Content-Disposition', `${mode}; filename*=UTF-8''${encodeURIComponent(fileObject.fileName)}`);
    response.send(content);
  }
}