<?php
    session_start();

    // Check if the user is already logged in
    if (isset($_SESSION['logged_in']) && $_SESSION['logged_in'] === true) {
        header('Location: dashboard.php');
        exit;
    }

    // Handle potential error messages
    $error_message = '';
    if (isset($_GET['error']) && $_GET['error'] === 'invalid_password') {
        $error_message = 'Invalid password. Please try again.';
    } elseif (isset($_GET['error']) && $_GET['error'] === 'session_expired') {
        $error_message = 'Your session has expired. Please log in again.';
    }
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>SCOPI Login</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f2f2f2;
            display: flex;
            justify-content: center;
            align-items: flex-start;
            height: 100vh;
            margin: 0;
            padding-top: 50px; /* Adjust this padding as needed */
        }

        .login-container {
            background-color: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            width: 90%;
            max-width: 400px;
        }

        .login-container h2 {
            text-align: center;
            margin-bottom: 20px;
        }

        .input-group {
            margin-bottom: 15px;
        }

        .input-group label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }

        .input-group input[type="password"] {
            width: 100%;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
            box-sizing: border-box; /* Ensure padding is included in width */
        }

        .login-button {
            width: 100%;
            padding: 10px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }

        .login-button:hover {
            background-color: #0056b3;
        }

        .error-message {
            color: red;
            text-align: center;
            margin-bottom: 15px;
        }

        @media (max-width: 480px) {
            .login-container {
                padding: 15px;
            }

            .login-button {
                font-size: 14px;
            }
        }
    </style>
</head>
<body>
    <div class="login-container">
        <h2>Login</h2>
        <?php if ($error_message): ?>
            <p class="error-message"><?php echo $error_message; ?></p>
        <?php endif; ?>
        <form action="login_script.php" method="POST">
            <div class="input-group">
                <label for="password">Password:</label>
                <input type="password" id="password" name="password" required>
            </div>
            <button type="submit" class="login-button">Login</button>
        </form>
    </div>
</body>
</html>
