/**
 * Admin-only thumbnail proxy — serves small thumbnails for the admin panel
 * using raw Immich asset UUIDs (no token encoding needed since admin is authenticated).
 */

import { NextRequest, NextResponse } from 'next/server';
import { isAdminAuthenticated, isAdminEnabled } from '@/lib/admin/auth';
import { getConfig } from '@/lib/config';

export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> },
) {
  if (!isAdminEnabled()) {
    return NextResponse.json({ error: 'Admin not enabled' }, { status: 403 });
  }
  if (!(await isAdminAuthenticated())) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  const config = getConfig();
  if (config.needsSetup) {
    return NextResponse.json({ error: 'Not configured' }, { status: 503 });
  }

  const { id: assetId } = await params;

  // Validate it looks like a UUID
  const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
  if (!uuidRegex.test(assetId)) {
    return NextResponse.json({ error: 'Invalid asset ID' }, { status: 400 });
  }

  try {
    const res = await fetch(
      `${config.immich.apiUrl}/assets/${assetId}/thumbnail?size=thumbnail`,
      {
        headers: {
          'x-api-key': config.immich.apiKey,
          Accept: 'application/octet-stream',
        },
      },
    );

    if (!res.ok) {
      return NextResponse.json({ error: 'Asset not found' }, { status: 404 });
    }

    const contentType = res.headers.get('content-type') || 'image/jpeg';
    const body = res.body;

    return new NextResponse(body, {
      headers: {
        'Content-Type': contentType,
        'Cache-Control': 'private, max-age=3600',
      },
    });
  } catch (err) {
    console.error('[Admin Thumbnail] Failed to fetch:', err);
    return NextResponse.json({ error: 'Failed to fetch thumbnail' }, { status: 502 });
  }
}