const express = require('express');
const path = require('path');

const PUBLIC_ROOT = path.join(__dirname, '..', 'public');

module.exports = express.static(PUBLIC_ROOT, {
  etag: true,
  lastModified: true,
  cacheControl: true,

  setHeaders(res, filePath) {
    const normalizedPath = filePath
      .replaceAll('\\', '/')
      .toLowerCase();

    const isThumbnail =
      normalizedPath.includes('/photos/') &&
      normalizedPath.includes('/thumbs/') &&
      /\.(jpg|jpeg|png|webp|gif)$/i.test(normalizedPath);

    if (isThumbnail) {
      res.setHeader(
        'Cache-Control',
        'public, max-age=86400'
      );
    }
  }
});