<?php
  $remoteUrl = 'https://stats.apps.coryd.dev/script.js';
  $cacheKey = 'remote_stats_script';
  $ttl = 3600;
  $js = null;
  $code = 200;
  $redis = null;

  try {
    if (extension_loaded('redis')) {
      $redis = new Redis();
      $redis->connect('127.0.0.1', 6379);

      if ($redis->exists($cacheKey)) $js = $redis->get($cacheKey);
    }
  } catch (Exception $e) {
    error_log("Redis unavailable: " . $e->getMessage());
  }

  if (!is_string($js)) {
    $ch = curl_init($remoteUrl);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);

    $js = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);

    curl_close($ch);

    if ($redis && $code === 200 && $js) $redis->setex($cacheKey, $ttl, $js);
  }

  if (!is_string($js) || trim($js) === '') {
    $js = '// Failed to fetch remote script';
    $code = 502;
  }

  http_response_code($code);
  header('Content-Type: application/javascript; charset=UTF-8');
  header('Cache-Control: public, max-age=60');
  echo $js;