<?php
// Include the header
include 'includes/header.php';

// Check if the user is an admin
if (!isset($_SESSION['user_id']) || ($_SESSION['role'] !== 'admin' && $_SESSION['role'] !== 'director')) {
    echo '<div class="alert alert-danger">Access denied. You must be an admin to access this page.</div>';
    include 'includes/footer.php';
    exit;
}

// Include database connection
require_once __DIR__ . '/../config.php';

// Function to execute SQL file
function execute_sql_file($file_path) {
    global $conn;
    
    // Read SQL file
    $sql = file_get_contents($file_path);
    
    // Split SQL into individual queries
    $queries = array_filter(array_map('trim', explode(';', $sql)));
    
    // Execute each query
    foreach ($queries as $query) {
        if (!empty($query)) {
            try {
                if (!$conn->query($query)) {
                    echo "<div class='alert alert-warning'>Warning: " . $conn->error . "</div>";
                }
            } catch (mysqli_sql_exception $e) {
                // Skip duplicate column errors
                if ($e->getCode() == 1060) {
                    echo "<div class='alert alert-info'>Info: Column already exists - skipping.</div>";
                } else {
                    echo "<div class='alert alert-danger'>Error: " . $e->getMessage() . "</div>";
                }
            }
        }
    }
}

// Start capturing output
ob_start();
?>

<div class="container mt-5">
    <div class="row">
        <div class="col-12">
            <div class="card">
                <div class="card-header">
                    <h4>Database Update</h4>
                </div>
                <div class="card-body">
                    <div class="alert alert-info">
                        <p>This page will update your database structure to include all the latest fields and tables for the Learning Management System.</p>
                    </div>

                    <div class="update-log">
                        <?php
                        // Update users table
                        echo "<h5>Updating users table structure...</h5>";
                        execute_sql_file(__DIR__ . '/database/update_users.sql');
                        echo "<hr>";

                        // Update courses table
                        echo "<h5>Updating courses table structure...</h5>";
                        include_once __DIR__ . '/database/alter_courses_table.php';
                        echo "<hr>";

                        // Get the output
                        $output = ob_get_clean();
                        
                        // Display the output
                        echo '<div class="update-results">';
                        echo $output;
                        echo '</div>';
                        ?>
                    </div>

                    <div class="text-center mt-4">
                        <a href="index.php" class="btn btn-primary">Return to Dashboard</a>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<style>
.update-results {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    padding: 15px;
    max-height: 400px;
    overflow-y: auto;
}
.update-results h5 {
    color: #0d6efd;
    margin-top: 20px;
}
.update-results hr {
    margin: 15px 0;
}
.alert {
    margin-bottom: 10px;
}
</style>

<?php
// Include the footer
include 'includes/footer.php';
?>