<?php
// Digital Ocean server monitoring via SSH

function sshCommand(string $cmd): string {
    $sshCmd = sprintf(
        'sshpass -p %s ssh -o StrictHostKeyChecking=no -o ConnectTimeout=8 %s@%s %s 2>/dev/null',
        escapeshellarg(DO_SSH_PASS),
        escapeshellarg(DO_SSH_USER),
        escapeshellarg(DO_SERVER_IP),
        escapeshellarg($cmd)
    );
    return shell_exec($sshCmd) ?? '';
}

// Check if sshpass is available
$hasSshpass = trim(shell_exec('which sshpass 2>/dev/null'));
if (!$hasSshpass) {
    echo json_encode([
        'error' => 'sshpass not installed on Jarvis server. Run: sudo apt-get install sshpass',
        'ip'    => DO_SERVER_IP,
    ]);
    exit;
}

// Gather DO server stats in one SSH session
$statsRaw = sshCommand("echo CPU:$(grep 'cpu ' /proc/stat | awk '{u=\$2+\$4; t=\$2+\$3+\$4+\$5; print u/t*100}');echo MEM_TOTAL:\$(grep MemTotal /proc/meminfo | awk '{print \$2}');echo MEM_FREE:\$(grep MemAvailable /proc/meminfo | awk '{print \$2}');echo UPTIME:\$(cat /proc/uptime | awk '{print int(\$1)}');echo DISK_USED:\$(df / | tail -1 | awk '{print \$5}');echo LOAD:\$(cat /proc/loadavg | awk '{print \$1}')");

$stats = [];
foreach (explode("\n", trim($statsRaw)) as $line) {
    [$key, $val] = explode(':', $line, 2) + [null, null];
    if ($key) $stats[$key] = trim($val ?? '');
}

// Get running services on DO
$services = sshCommand("systemctl is-active lsphp85 lshttpd nginx apache2 mysql mariadb php8.1-fpm 2>/dev/null | paste <(echo -e 'lsphp85\nlshttpd\nnginx\napache2\nmysql\nmariadb\nphp8.1-fpm') - | awk '{print \$1\":\"\$2}'");
$svcMap = [];
foreach (explode("\n", trim($services)) as $line) {
    if (!$line) continue;
    [$name, $status] = explode(':', $line, 2) + [null, null];
    if ($name && $status && trim($status) === 'active') {
        $svcMap[trim($name)] = true;
    }
}

// Get disk usage per site
$siteDisk = sshCommand("du -sh /home/*/public_html 2>/dev/null | sort -h");
$sites = [];
foreach (explode("\n", trim($siteDisk)) as $line) {
    if (preg_match('/^([\d.]+\w)\s+\/home\/([^\/]+)/', $line, $m)) {
        $sites[$m[2]] = $m[1];
    }
}

$cpuPct = isset($stats['CPU']) ? round((float)$stats['CPU'], 1) : null;
$memTotal = (int)($stats['MEM_TOTAL'] ?? 0);
$memFree  = (int)($stats['MEM_FREE']  ?? 0);
$memUsed  = $memTotal - $memFree;
$uptimeSec = (int)($stats['UPTIME'] ?? 0);
$uptimeDays = intdiv($uptimeSec, 86400);
$uptimeHrs  = intdiv($uptimeSec % 86400, 3600);

echo json_encode([
    'ip'         => DO_SERVER_IP,
    'reachable'  => !empty($statsRaw),
    'cpu_pct'    => $cpuPct,
    'memory'     => [
        'total_mb'  => round($memTotal / 1024),
        'used_mb'   => round($memUsed  / 1024),
        'percent'   => $memTotal > 0 ? round(($memUsed/$memTotal)*100,1) : 0,
    ],
    'disk_used_pct' => $stats['DISK_USED'] ?? null,
    'load_1m'    => (float)($stats['LOAD'] ?? 0),
    'uptime'     => "{$uptimeDays}d {$uptimeHrs}h",
    'services'   => $svcMap,
    'sites'      => $sites,
    'timestamp'  => date('c'),
]);