<?php
header('Content-Type: application/xml; charset=utf-8');
$scheme = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
$currentHost = $_SERVER['HTTP_HOST'] ?? ($_SERVER['SERVER_NAME'] ?? '');
$baseUrl = $scheme . '://' . $currentHost;
$today = date('Y-m-d');
$paths = ['/', '/about/', '/topics/', '/ranking/', '/help/', '/rules/', '/activity/'];
echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
echo "<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">\n";
foreach ($paths as $path) {
  echo "  <url><loc>" . htmlspecialchars($baseUrl . $path, ENT_XML1, 'UTF-8') . "</loc><lastmod>" . $today . "</lastmod><changefreq>weekly</changefreq><priority>" . ($path === '/' ? '1.0' : '0.8') . "</priority></url>\n";
}
echo "</urlset>";
?>
