<?php
// index.php - GhostAI Server Dashboard (Dark Bootstrap, High-Contrast, ADA-friendly)

// ---------- Helpers ----------
function run_cmd($cmd, $timeout = 3) {
    // Basic guard: strip dangerous chars (still assume trusted admin usage)
    $cmd = trim($cmd);
    if ($cmd === '') return ['code' => 1, 'out' => 'N/A'];
    // Timeout wrapper (Linux 'timeout' if available)
    $timeout_bin = trim(shell_exec('command -v timeout 2>/dev/null')) ?: '';
    $safe = $timeout_bin ? escapeshellcmd($timeout_bin) . " " . intval($timeout) . "s " . $cmd : $cmd;
    $out = [];
    $code = 0;
    @exec($safe . ' 2>&1', $out, $code);
    return ['code' => $code, 'out' => implode("\n", $out)];
}

function human_bytes($bytes) {
    $u = ['B','KB','MB','GB','TB','PB'];
    $i = 0;
    while ($bytes >= 1024 && $i < count($u)-1) { $bytes /= 1024; $i++; }
    return sprintf('%.1f %s', $bytes, $u[$i]);
}

function status_badge($status) {
    $s = strtolower(trim($status));
    if (in_array($s, ['online','active','up','running','listening'])) return ['success','Online'];
    if (in_array($s, ['stopped','inactive','exited'])) return ['secondary','Stopped'];
    if (in_array($s, ['errored','failed','dead'])) return ['danger','Error'];
    if (in_array($s, ['unknown','n/a','not found'])) return ['dark','Unknown'];
    return ['warning', ucfirst($status ?: 'Unknown')];
}

function parse_pm2() {
    // Prefer JSON output
    $res = run_cmd('pm2 jlist');
    if ($res['code'] === 0 && strlen($res['out']) > 2) {
        $json = json_decode($res['out'], true);
        if (is_array($json)) return $json;
    }
    // Fallback: pm2 status tabular (parse minimally)
    $res2 = run_cmd('pm2 list --no-color');
    $apps = [];
    if ($res2['code'] === 0) {
        $lines = explode("\n", $res2['out']);
        foreach ($lines as $ln) {
            if (preg_match('/^\s*\|\s*(\S+)\s*\|\s*(\d+)\s*\|\s*([A-Z]+)\s*\|\s*(\d+)\s*\|\s*([\dms:\.]+)\s*\|\s*(\S*)/i', $ln, $m)) {
                $apps[] = [
                    'name' => $m[1],
                    'pm_id' => $m[2],
                    'status' => strtolower($m[3]),
                    'cpu' => null,
                    'mem' => null,
                    'uptime' => $m[5],
                    'mode' => $m[6] ?? ''
                ];
            }
        }
    }
    return $apps;
}

function get_cpu_info() {
    $model = trim(run_cmd("awk -F': ' '/model name/ {print \$2; exit}' /proc/cpuinfo")['out']);
    $cores_p = intval(trim(run_cmd("getconf _NPROCESSORS_ONLN")['out'])) ?: 0;
    $loadavg = trim(run_cmd("cut -d' ' -f1-3 /proc/loadavg")['out']);
    return [$model ?: 'N/A', $cores_p, $loadavg ?: 'N/A'];
}

function get_mem_info() {
    // /proc/meminfo (bytes -> kB)
    $mem_total_kb = intval(trim(run_cmd("awk '/MemTotal/ {print \$2}' /proc/meminfo")['out']));
    $mem_avail_kb = intval(trim(run_cmd("awk '/MemAvailable/ {print \$2}' /proc/meminfo")['out']));
    $mem_used_kb = max(0, $mem_total_kb - $mem_avail_kb);
    return [
        'total' => human_bytes($mem_total_kb * 1024),
        'used'  => human_bytes($mem_used_kb * 1024),
        'free'  => human_bytes($mem_avail_kb * 1024),
        'pct'   => $mem_total_kb ? round(($mem_used_kb / $mem_total_kb) * 100) : 0
    ];
}

function get_disk_info() {
    $res = run_cmd("df -h --output=target,size,used,avail,pcent -x tmpfs -x devtmpfs");
    $rows = [];
    if ($res['code'] === 0) {
        $lines = explode("\n", trim($res['out']));
        foreach (array_slice($lines, 1) as $l) {
            $l = preg_replace('/\s+/', ' ', trim($l));
            if (!$l) continue;
            [$mount, $size, $used, $avail, $pct] = array_pad(explode(' ', $l), 5, '');
            $rows[] = compact('mount','size','used','avail','pct');
        }
    }
    return $rows;
}

function get_gpu_info() {
    $nvsmi = trim(run_cmd('command -v nvidia-smi')['out']);
    if (!$nvsmi) return [];
    $q = '--query-gpu=name,driver_version,pstate,temperature.gpu,memory.total,memory.used,pcie.link.gen.current,pcie.link.width.current --format=csv,noheader';
    $res = run_cmd("nvidia-smi $q", 4);
    $out = [];
    if ($res['code'] === 0) {
        foreach (explode("\n", trim($res['out'])) as $line) {
            if (!$line) continue;
            $parts = array_map('trim', explode(',', $line));
            $out[] = [
                'name' => $parts[0] ?? 'NVIDIA GPU',
                'driver' => $parts[1] ?? 'N/A',
                'pstate' => $parts[2] ?? 'N/A',
                'tempC' => $parts[3] ?? 'N/A',
                'mem_total' => $parts[4] ?? 'N/A',
                'mem_used'  => $parts[5] ?? 'N/A',
                'pcie_gen'  => $parts[6] ?? 'N/A',
                'pcie_w'    => $parts[7] ?? 'N/A',
            ];
        }
    }
    return $out;
}

function get_network_info() {
    $hostname = trim(run_cmd('hostname')['out']);
    $ips = trim(run_cmd("hostname -I")['out']);
    $gateway = trim(run_cmd("ip route | awk '/default/ {print \$3; exit}'")['out']);
    return [$hostname ?: 'N/A', $ips ?: 'N/A', $gateway ?: 'N/A'];
}

function get_os_info() {
    $pretty = trim(run_cmd("awk -F'=' '/^PRETTY_NAME/{gsub(/\"/ ,\"\",\$2); print \$2}' /etc/os-release")['out']);
    $kernel = trim(run_cmd('uname -r')['out']);
    $arch = trim(run_cmd('uname -m')['out']);
    $uptime = trim(run_cmd('uptime -p')['out']);
    $boot = trim(run_cmd('who -b | awk \'{print $3, $4}\'')['out']);
    $phpv = PHP_VERSION;
    $nginx = trim(run_cmd('nginx -v 2>&1')['out']);
    $nginx = $nginx ?: 'nginx not found';
    return [$pretty ?: 'Linux', $kernel ?: 'N/A', $arch ?: 'N/A', $uptime ?: 'N/A', $boot ?: 'N/A', $phpv, $nginx];
}

function get_services_status($services = ['nginx','php-fpm','pm2']) {
    $data = [];
    foreach ($services as $svc) {
        $cmd = "systemctl is-active $svc";
        $r = run_cmd($cmd);
        $status = $r['code'] === 0 ? trim($r['out']) : 'unknown';
        $data[] = ['name' => $svc, 'status' => $status];
    }
    return $data;
}

function get_top_procs($limit = 8) {
    $r = run_cmd("ps -eo pid,comm,%cpu,%mem --sort=-%cpu | head -n " . intval($limit + 1));
    $rows = [];
    if ($r['code'] === 0) {
        $lines = explode("\n", trim($r['out']));
        foreach (array_slice($lines, 1) as $ln) {
            $ln = preg_replace('/\s+/', ' ', trim($ln));
            if (!$ln) continue;
            [$pid,$comm,$cpu,$mem] = array_pad(explode(' ', $ln), 4, '');
            $rows[] = compact('pid','comm','cpu','mem');
        }
    }
    return $rows;
}

function get_log_tail($path, $lines = 80) {
    if (!is_readable($path)) return "Log not found or unreadable: $path";
    $r = run_cmd("tail -n " . intval($lines) . " " . escapeshellarg($path));
    return $r['code'] === 0 ? $r['out'] : "Unable to read log.";
}

// ---------- Page Settings ----------
$auto_refresh = isset($_GET['autorefresh']) ? (int)$_GET['autorefresh'] : 0;
$refresh_secs = ($auto_refresh > 0 && $auto_refresh <= 600) ? $auto_refresh : 0;
$custom_log = isset($_GET['log']) ? $_GET['log'] : '';
$log_path = $custom_log ?: '/var/log/nginx/access.log';

// ---------- Data ----------
[$os_name,$kernel,$arch,$uptime,$booted,$phpv,$nginxv] = get_os_info();
[$hostname,$ips,$gw] = get_network_info();
[$cpu_model,$cores,$load] = get_cpu_info();
$mem = get_mem_info();
$disks = get_disk_info();
$gpus = get_gpu_info();
$pm2 = parse_pm2();
$services = get_services_status(['nginx','php-fpm','pm2']);
$procs = get_top_procs(8);
$log_tail = get_log_tail($log_path, 100);
?>
<!doctype html>
<html lang="en" data-bs-theme="dark">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<?php if ($refresh_secs): ?>
<meta http-equiv="refresh" content="<?php echo htmlspecialchars($refresh_secs); ?>">
<?php endif; ?>
<title>🖥️ GhostAI Server Dashboard</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
<style>
  :root {
    color-scheme: dark;
  }
  body {
    background: #0E1014 !important;
    color: #EAECEF !important;
    font-size: 1.05rem;
  }
  * { color: #EAECEF !important; }
  .card { background: #111520; border: 1px solid #243049; border-radius: 16px; }
  .badge { font-size: 0.9rem; }
  .table > :not(caption) > * > * { background: transparent !important; color: #EAECEF !important; }
  .nav-link { color: #EAECEF !important; }
  .form-select, .form-control { background: #151a24; color: #EAECEF; border: 1px solid #2A3142; }
  .skip-link {
    position: absolute; left: -10000px; top: auto; width: 1px; height: 1px; overflow: hidden;
  }
  .skip-link:focus { position: static; width: auto; height: auto; margin: 8px; padding: 8px; background: #1f2937; border-radius: 8px; }
  .kpi { font-weight: 700; font-size: 1.25rem; }
  .progress { background-color: #1b2231; height: 12px; border-radius: 999px; }
  .emoji { font-size: 1.4rem; margin-right: .35rem; }
  .footer { color: #9aa4b2 !important; }
</style>
</head>
<body>
<a href="#main" class="skip-link" aria-label="Skip to content">Skip to content</a>

<nav class="navbar navbar-expand-lg border-bottom" aria-label="Primary">
  <div class="container-fluid">
    <span class="navbar-brand fw-bold">🖥️ GhostAI Dashboard</span>
    <div class="d-flex align-items-center gap-2">
      <form method="get" class="d-flex" role="search" aria-label="Auto refresh interval">
        <label class="me-2" for="autorefresh">⏱️ Auto-refresh</label>
        <select class="form-select form-select-sm me-2" id="autorefresh" name="autorefresh" aria-label="Auto refresh interval select">
          <?php foreach ([0,5,10,15,30,60,120,300,600] as $sec): ?>
            <option value="<?= $sec ?>" <?= $sec===$auto_refresh?'selected':''; ?>><?= $sec ?>s</option>
          <?php endforeach; ?>
        </select>
        <button class="btn btn-sm btn-primary" type="submit" aria-label="Apply refresh interval">Apply</button>
      </form>
    </div>
  </div>
</nav>

<main id="main" class="container py-4" aria-live="polite">
  <div class="row g-3">
    <div class="col-12 col-xl-6">
      <div class="card h-100">
        <div class="card-body">
          <h5 class="card-title"><span class="emoji">💻</span>System Overview</h5>
          <div class="row g-3">
            <div class="col-12">
              <div class="kpi">Host: <span class="text-info-emphasis"><?= htmlspecialchars($hostname) ?></span></div>
              <div><?= htmlspecialchars($os_name) ?> • Kernel <?= htmlspecialchars($kernel) ?> • <?= htmlspecialchars($arch) ?></div>
              <div>Uptime: <?= htmlspecialchars($uptime) ?> • Boot: <?= htmlspecialchars($booted) ?></div>
              <div>PHP: <?= htmlspecialchars($phpv) ?> • <?= htmlspecialchars($nginxv) ?></div>
              <div>IP(s): <?= htmlspecialchars($ips) ?> • GW: <?= htmlspecialchars($gw) ?></div>
            </div>
            <div class="col-md-6">
              <div class="card p-3">
                <div class="fw-semibold"><span class="emoji">🧠</span>CPU</div>
                <div class="small text-secondary">Model</div>
                <div class="kpi"><?= htmlspecialchars($cpu_model) ?></div>
                <div class="small">Cores: <span class="fw-semibold"><?= intval($cores) ?></span></div>
                <div class="small">Load: <span class="fw-semibold"><?= htmlspecialchars($load) ?></span></div>
              </div>
            </div>
            <div class="col-md-6">
              <div class="card p-3">
                <div class="fw-semibold"><span class="emoji">📈</span>Memory</div>
                <div class="small text-secondary">Usage</div>
                <div class="kpi"><?= htmlspecialchars($mem['used']) ?> / <?= htmlspecialchars($mem['total']) ?></div>
                <div class="progress mt-2" role="progressbar" aria-valuenow="<?= intval($mem['pct']) ?>" aria-valuemin="0" aria-valuemax="100" aria-label="Memory usage">
                  <div class="progress-bar bg-warning" style="width: <?= intval($mem['pct']) ?>%"></div>
                </div>
                <div class="small mt-1">Free: <?= htmlspecialchars($mem['free']) ?> (<?= intval($mem['pct']) ?>%)</div>
              </div>
            </div>
          </div>
          <?php if (!empty($gpus)): ?>
          <div class="mt-3">
            <div class="fw-semibold mb-2"><span class="emoji">🎮</span>GPU</div>
            <div class="table-responsive">
              <table class="table table-sm align-middle">
                <thead><tr><th>Name</th><th>Driver</th><th>Temp</th><th>VRAM</th><th>PCIe</th><th>P-State</th></tr></thead>
                <tbody>
                <?php foreach ($gpus as $g): ?>
                  <tr>
                    <td><?= htmlspecialchars($g['name']) ?></td>
                    <td><?= htmlspecialchars($g['driver']) ?></td>
                    <td><?= htmlspecialchars($g['tempC']) ?></td>
                    <td><?= htmlspecialchars($g['mem_used']) ?> / <?= htmlspecialchars($g['mem_total']) ?></td>
                    <td>Gen <?= htmlspecialchars($g['pcie_gen']) ?> ×<?= htmlspecialchars($g['pcie_w']) ?></td>
                    <td><?= htmlspecialchars($g['pstate']) ?></td>
                  </tr>
                <?php endforeach; ?>
                </tbody>
              </table>
            </div>
          </div>
          <?php else: ?>
          <div class="mt-3 small text-secondary">No NVIDIA GPU info (nvidia-smi not found or no GPU).</div>
          <?php endif; ?>
        </div>
      </div>
    </div>

    <div class="col-12 col-xl-6">
      <div class="card h-100">
        <div class="card-body">
          <h5 class="card-title"><span class="emoji">🗄️</span>Disks</h5>
          <div class="table-responsive">
            <table class="table table-sm align-middle">
              <thead><tr><th>Mount</th><th>Size</th><th>Used</th><th>Avail</th><th>Use%</th></tr></thead>
              <tbody>
              <?php foreach ($disks as $d): ?>
                <tr>
                  <td><?= htmlspecialchars($d['mount']) ?></td>
                  <td><?= htmlspecialchars($d['size']) ?></td>
                  <td><?= htmlspecialchars($d['used']) ?></td>
                  <td><?= htmlspecialchars($d['avail']) ?></td>
                  <td><span class="badge bg-<?= (intval(rtrim($d['pct'],'%')) >= 85 ? 'danger' : (intval(rtrim($d['pct'],'%')) >= 70 ? 'warning' : 'success')) ?>"><?= htmlspecialchars($d['pct']) ?></span></td>
                </tr>
              <?php endforeach; ?>
              </tbody>
            </table>
          </div>

          <div class="mt-4">
            <h5 class="card-title"><span class="emoji">🧩</span>Services</h5>
            <div class="row g-2">
              <?php foreach ($services as $s): $b = status_badge($s['status']); ?>
                <div class="col-auto">
                  <span class="badge bg-<?= $b[0] ?>" aria-label="<?= htmlspecialchars($s['name']) ?> status"><?= htmlspecialchars($s['name']) ?>: <?= htmlspecialchars($b[1]) ?></span>
                </div>
              <?php endforeach; ?>
            </div>
          </div>

          <div class="mt-4">
            <h5 class="card-title"><span class="emoji">📊</span>Top Processes (CPU)</h5>
            <div class="table-responsive">
              <table class="table table-sm align-middle">
                <thead><tr><th>PID</th><th>Command</th><th>CPU%</th><th>MEM%</th></tr></thead>
                <tbody>
                <?php foreach ($procs as $p): ?>
                  <tr>
                    <td><?= htmlspecialchars($p['pid']) ?></td>
                    <td><?= htmlspecialchars($p['comm']) ?></td>
                    <td><?= htmlspecialchars($p['cpu']) ?></td>
                    <td><?= htmlspecialchars($p['mem']) ?></td>
                  </tr>
                <?php endforeach; ?>
                </tbody>
              </table>
            </div>
          </div>

        </div>
      </div>
    </div>

    <div class="col-12">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title"><span class="emoji">🎛️</span>PM2 Apps</h5>
          <?php if (!empty($pm2) && is_array($pm2) && isset($pm2[0]['name']) || (isset($pm2[0]['name']) || (is_array($pm2) && count($pm2)>0))): ?>
          <div class="table-responsive">
            <table class="table table-sm align-middle">
              <thead>
                <tr>
                  <th>Name</th><th>ID</th><th>Status</th><th>Mode</th><th>CPU</th><th>Mem</th><th>Uptime</th>
                </tr>
              </thead>
              <tbody>
                <?php
                // Two shapes: JSON from jlist, or parsed table rows
                if (!empty($pm2) && isset($pm2[0]['pm2_env'])) {
                    foreach ($pm2 as $app) {
                        $name = $app['name'] ?? ($app['pm2_env']['name'] ?? 'app');
                        $pm_id = $app['pm_id'] ?? ($app['pm2_env']['pm_id'] ?? '');
                        $st = strtolower($app['pm2_env']['status'] ?? 'unknown');
                        $mode = $app['pm2_env']['exec_mode'] ?? '';
                        $cpu = $app['monit']['cpu'] ?? null;
                        $mem_b = $app['monit']['memory'] ?? null;
                        $memh = $mem_b ? human_bytes($mem_b) : 'N/A';
                        $upt = $app['pm2_env']['pm_uptime'] ?? 0;
                        $upt_h = $upt ? (floor((time() - intval($upt/1000)) / 3600) . 'h') : 'N/A';
                        $b = status_badge($st);
                        echo "<tr>
                          <td>".htmlspecialchars($name)."</td>
                          <td>".htmlspecialchars($pm_id)."</td>
                          <td><span class='badge bg-{$b[0]}'>".htmlspecialchars($b[1])."</span></td>
                          <td>".htmlspecialchars($mode)."</td>
                          <td>".($cpu !== null ? htmlspecialchars($cpu).'%' : 'N/A')."</td>
                          <td>".htmlspecialchars($memh)."</td>
                          <td>".htmlspecialchars($upt_h)."</td>
                        </tr>";
                    }
                } else {
                    foreach ($pm2 as $app) {
                        $b = status_badge($app['status'] ?? 'unknown');
                        echo "<tr>
                          <td>".htmlspecialchars($app['name'] ?? 'app')."</td>
                          <td>".htmlspecialchars($app['pm_id'] ?? '')."</td>
                          <td><span class='badge bg-{$b[0]}'>".htmlspecialchars($b[1])."</span></td>
                          <td>".htmlspecialchars($app['mode'] ?? '')."</td>
                          <td>".htmlspecialchars($app['cpu'] ?? 'N/A')."</td>
                          <td>".htmlspecialchars($app['mem'] ?? 'N/A')."</td>
                          <td>".htmlspecialchars($app['uptime'] ?? 'N/A')."</td>
                        </tr>";
                    }
                }
                ?>
              </tbody>
            </table>
          </div>
          <?php else: ?>
            <div class="small text-secondary">PM2 not detected or no apps configured.</div>
          <?php endif; ?>
        </div>
      </div>
    </div>

    <div class="col-12">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title"><span class="emoji">🪵</span>Logs</h5>
          <form method="get" class="row g-2 mb-3" aria-label="Log selection">
            <div class="col-md-6">
              <label for="log" class="form-label">Log file path</label>
              <input type="text" class="form-control" id="log" name="log" value="<?= htmlspecialchars($log_path) ?>" placeholder="/var/log/nginx/access.log" aria-describedby="logHelp">
              <div id="logHelp" class="form-text">Enter a readable log file path to tail.</div>
            </div>
            <div class="col-md-3">
              <label for="autorefresh2" class="form-label">Auto-refresh</label>
              <select class="form-select" id="autorefresh2" name="autorefresh">
                <?php foreach ([0,5,10,15,30,60,120,300,600] as $sec): ?>
                  <option value="<?= $sec ?>" <?= $sec===$auto_refresh?'selected':''; ?>><?= $sec ?>s</option>
                <?php endforeach; ?>
              </select>
            </div>
            <div class="col-md-3 d-flex align-items-end">
              <button class="btn btn-success w-100" type="submit">Update</button>
            </div>
          </form>
          <pre class="p-3" style="background:#0b0f17; border-radius:12px; max-height:380px; overflow:auto; white-space:pre-wrap;"><?= htmlspecialchars($log_tail) ?></pre>
        </div>
      </div>
    </div>

  </div>
</main>

<footer class="container py-4 footer">
  <div class="d-flex flex-wrap justify-content-between">
    <div>© <?= date('Y') ?> GhostAI • High-contrast, keyboard-navigable UI</div>
    <div>
      <span class="me-2">Contrast: AAA</span>
      <span class="me-2">ARIA Labels Enabled</span>
      <span>Keyboard Shortcuts: <kbd>Tab</kbd> to navigate</span>
    </div>
  </div>
</footer>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" defer></script>
</body>
</html>