import { Controller, Get, Header, NotFoundException, Param, StreamableFile } from '@nestjs/common';
import { createReadStream } from 'node:fs';
import { Public } from '../auth/guards';
import { mimeForUpload, resolveStoredUpload } from './upload-path';

/**
 * Public file serving at GET /api/uploads/:filename.
 *
 * ProductImage.url is stored as `/uploads/<file>`, which nginx proxies. Shoppers
 * and operators also hit `/api/uploads/<file>` (user-app axios base is `/api`,
 * and the API Dokploy domain sits behind the same prefix). useStaticAssets only
 * mounts `/uploads/`, so those requests 404'd with Nest's "Cannot GET /api/uploads/...".
 */
@Public()
@Controller('uploads')
export class PublicUploadsController {
  @Get(':filename')
  @Header('Cache-Control', 'public, max-age=86400')
  stream(@Param('filename') filename: string): StreamableFile {
    const file = resolveStoredUpload(filename);
    if (!file) throw new NotFoundException('فایل یافت نشد');

    return new StreamableFile(createReadStream(file), {
      type: mimeForUpload(file) ?? 'application/octet-stream',
      disposition: 'inline',
    });
  }
}