<?php
// Konfigurasi Database (Sesuaikan dengan data database ujian di aaPanel)
$db_host = 'localhost';
$db_user = 'db_ujian';     // Ganti dengan username database ujian kamu di aaPanel
$db_pass = '123';  // Ganti dengan password database kamu
$db_name = 'db_ujian';     // Ganti dengan nama database kamu

// Buat koneksi ke database
$conn = @new mysqli($db_host, $db_user, $db_pass, $db_name);

// Cek koneksi
if ($conn->connect_error) {
    die("Koneksi Database Gagal: " . $conn->connect_error);
}

$pesan_error = "";

// Proses ketika tombol login ditekan
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $nisn = $conn->real_escape_string($_POST['username']);
    $token = $conn->real_escape_string($_POST['password']);

    // Cek ke tabel database (Contoh nama tabel: peserta_ujian dengan kolom nisn dan token)
    $sql = "SELECT * FROM peserta_ujian WHERE nisn = '$nisn' AND token = '$token' LIMIT 1";
    $result = $conn->query($sql);

    if ($result && $result->num_rows > 0) {
        // Jika data ditemukan, arahkan ke halaman soal ujian (misal: soal.php)
        echo "<script>alert('Login Berhasil! Selamat Mengerjakan.'); window.location.href='soal.php';</script>";
        exit;
    } else {
        // Jika gagal
        $pesan_error = "NISN atau Token Ujian Salah!";
    }
}
?>

<!DOCTYPE html>
<html lang="id">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Portal Ujian Online - SMK Teknologi Nusantara</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1rem;
        }
        .login-card {
            background: white;
            width: 100%;
            max-width: 400px;
            padding: 2.5rem;
            border-radius: 16px;
            box-shadow: 0 20px 25px -5px rgba(0,0,0,0.3);
        }
        .login-header {
            text-align: center;
            margin-bottom: 2rem;
        }
        .login-header h2 {
            color: #0f172a;
            font-size: 1.6rem;
            margin-bottom: 0.5rem;
        }
        .login-header p {
            color: #64748b;
            font-size: 0.9rem;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #334155;
            font-size: 0.9rem;
        }
        .form-group input {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid #cbd5e1;
            border-radius: 8px;
            outline: none;
            transition: border-color 0.3s;
        }
        .form-group input:focus {
            border-color: #0284c7;
            box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
        }
        .btn-login {
            width: 100%;
            padding: 0.8rem;
            background: #0284c7;
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: bold;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.3s;
        }
        .btn-login:hover {
            background: #0369a1;
        }
        .alert-error {
            background-color: #fee2e2;
            color: #991b1b;
            padding: 10px;
            border-radius: 6px;
            font-size: 13px;
            margin-bottom: 1.2rem;
            text-align: center;
            border: 1px solid #fecaca;
        }
        .footer-text {
            text-align: center;
            margin-top: 1.5rem;
            font-size: 0.8rem;
            color: #94a3b8;
        }
        .db-status {
            font-size: 11px;
            color: #22c55e;
            text-align: center;
            margin-top: 8px;
        }
    </style>
</head>
<body>

    <div class="login-card">
        <div class="login-header">
            <h2>CBT Exam Center</h2>
            <p>Sistem Ujian Berbasis Komputer & Online</p>
            <div class="db-status">🟢 Terhubung ke Database MySQL</div>
        </div>

        <?php if (!empty($pesan_error)): ?>
            <div class="alert-error"><?php echo $pesan_error; ?></div>
        <?php endif; ?>

        <form action="" method="POST">
            <div class="form-group">
                <label for="username">Nomor Peserta / NISN</label>
                <input type="text" id="username" name="username" placeholder="Masukkan NISN Anda" required>
            </div>

            <div class="form-group">
                <label for="password">Kata Sandi / Token</label>
                <input type="password" id="password" name="password" placeholder="Masukkan Password Ujian" required>
            </div>

            <button type="submit" class="btn-login">Masuk Ujian</button>
        </form>

        <div class="footer-text">
            &copy; 2026 SMK Teknologi Nusantara<br>
            Server Node: Debian aaPanel Cluster
        </div>
    </div>

</body>
</html>

<?php 
// Menutup koneksi database
$conn->close(); 
?>