<?

// Get endpoint
$request = explode('/', $_GET['path']);

if($request[0] == '5c7a5fb4577344cfae1c6f8b8b6b28f44b9d3a56c3278a5f5a00c269d749d2e3'){
	
    // Core stats

    $load = function_exists('sys_getloadavg') ? sys_getloadavg() : null;

    $disk = [
        'root_total_bytes' => @disk_total_space('/') ?: null,
        'root_free_bytes'  => @disk_free_space('/') ?: null,
    ];
    $disk['root_used_bytes'] = ($disk['root_total_bytes'] && $disk['root_free_bytes'])
        ? ($disk['root_total_bytes'] - $disk['root_free_bytes'])
        : null;
    $disk['root_used_pct'] = $disk['root_total_bytes'] ? round($disk['root_used_bytes'] / $disk['root_total_bytes'] * 100, 2) : null;

    $services = [
        'nginx'    => serviceStatus(['nginx']),
        'apache'   => serviceStatus(['apache2', 'httpd']),
        'mysql'    => serviceStatus(['mariadb', 'mysqld', 'mysql']),
        'php-fpm'  => serviceStatus(['php-fpm', 'php8.3-fpm', 'php8.2-fpm', 'php8.1-fpm', 'plesk-php80-fpm']),
        'postfix'  => serviceStatus(['postfix']),
        'dovecot'  => serviceStatus(['dovecot']),
        'named'    => serviceStatus(['named', 'bind9']),
    ];

    $mem = parseMemInfo();
    $cpus = cpuCount();
    $upt  = uptimeSeconds();

    // Output
    $out = [
        'host' => [
            'hostname'   => gethostname(),
            'os'         => php_uname(),
            'php'        => PHP_VERSION,
            'sapi'       => php_sapi_name(),
        ],
        'uptime_seconds' => $upt,
        'load_avg'       => $load ? [
            '1min'  => $load[0],
            '5min'  => $load[1],
            '15min' => $load[2],
            'per_cpu_1min' => ($cpus && $load) ? round($load[0] / $cpus, 2) : null,
        ] : null,
        'cpu'            => [
            'cores' => $cpus,
        ],
        'memory'         => $mem,
        'disk'           => [
            'root_total_bytes' => $disk['root_total_bytes'],
            'root_used_bytes'  => $disk['root_used_bytes'],
            'root_free_bytes'  => $disk['root_free_bytes'],
            'root_used_pct'    => $disk['root_used_pct'],
            'root_total_h'     => $disk['root_total_bytes'] ? bytesFmt($disk['root_total_bytes']) : null,
            'root_used_h'      => $disk['root_used_bytes'] ? bytesFmt($disk['root_used_bytes']) : null,
            'root_free_h'      => $disk['root_free_bytes'] ? bytesFmt($disk['root_free_bytes']) : null,
        ],
        'services'       => $services
    ];

    header('Content-Type: application/json; charset=utf-8');
    echo json_encode($out, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES) . PHP_EOL;
	
} else {
	header('Location: http://www.informer.eu/');
}

function sh($cmd) {
    // Run shell command safely; return trimmed string or null
    $out = @shell_exec($cmd . ' 2>/dev/null');
    return $out !== null ? trim($out) : null;
}

function parseMemInfo() {
    $meminfo = @file_get_contents('/proc/meminfo');
    if (!$meminfo) return null;
    $data = [];
    foreach (explode("\n", $meminfo) as $line) {
        if (preg_match('/^(\w+):\s+(\d+)\s+kB$/', trim($line), $m)) {
            $data[$m[1]] = (int)$m[2] * 1024; // bytes
        }
    }
    if (!$data) return null;

    // Prefer MemAvailable if present
    $total = $data['MemTotal'] ?? 0;
    $free  = $data['MemFree']  ?? 0;
    $buff  = $data['Buffers']  ?? 0;
    $cached= $data['Cached']   ?? 0;
    $avail = $data['MemAvailable'] ?? ($free + $buff + $cached);
    $used  = max(0, $total - $avail);

    return [
        'total_bytes'      => $total,
        'used_bytes'       => $used,
        'available_bytes'  => $avail,
        'free_bytes'       => $free,
        'buffers_bytes'    => $buff,
        'cached_bytes'     => $cached,
        'used_pct'         => $total > 0 ? round($used / $total * 100, 2) : null,
    ];
}

function cpuCount() {
    $n = (int)sh('nproc');
    if ($n > 0) return $n;
    $cpuinfo = @file_get_contents('/proc/cpuinfo');
    if ($cpuinfo && preg_match_all('/^processor\s+:\s+\d+/m', $cpuinfo, $m)) return count($m[0]);
    return null;
}

function uptimeSeconds() {
    $s = @file_get_contents('/proc/uptime');
    if ($s && preg_match('/^([\d\.]+)/', $s, $m)) return (int)floatval($m[1]);
    // fallback
    $u = sh('cut -d. -f1 /proc/uptime'); // still /proc but simpler
    return $u !== null ? (int)$u : null;
}

function serviceStatus($nameCandidates) {
    // Try systemctl, else service
    foreach ((array)$nameCandidates as $name) {
        $out = sh("systemctl is-active $name");
        if ($out) return $out; // active|inactive|failed|unknown
        $out = sh("service $name status");
        if ($out) {
            if (stripos($out, 'running') !== false) return 'active';
            if (stripos($out, 'dead') !== false || stripos($out, 'stopped') !== false) return 'inactive';
            return 'unknown';
        }
    }
    return 'unknown';
}

function bytesFmt($b) {
    $units = ['B','KB','MB','GB','TB','PB'];
    $i = 0; $v = max(0, (float)$b);
    while ($v >= 1024 && $i < count($units)-1) { $v /= 1024; $i++; }
    return round($v, 2) . ' ' . $units[$i];
}