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