<?php
require_once __DIR__ . '/config.php';

function run_migrations() {
    $pdo = db_connect();

    // 1. Create migrations table if it doesn't exist
    $pdo->exec("CREATE TABLE IF NOT EXISTS `migrations` (
        `id` INT AUTO_INCREMENT PRIMARY KEY,
        `migration_file` VARCHAR(255) NOT NULL UNIQUE,
        `applied_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    // 2. Get all migration files
    $migration_files = glob(__DIR__ . '/migrations/*.sql');

    // 3. Get already applied migrations
    $stmt = $pdo->query("SELECT `migration_file` FROM `migrations`");
    $applied_migrations = $stmt->fetchAll(PDO::FETCH_COLUMN);

    echo "Starting migrations...\n";

    // 4. Apply pending migrations
    foreach ($migration_files as $file) {
        $filename = basename($file);
        if (!in_array($filename, $applied_migrations)) {
            echo "Applying migration: {$filename}...\n";
            
            // Execute the SQL file
            $sql = file_get_contents($file);
            if (!empty(trim($sql))) {
                $pdo->exec($sql);
            }

            // Record the migration
            $stmt = $pdo->prepare("INSERT INTO `migrations` (`migration_file`) VALUES (?)");
            $stmt->execute([$filename]);

            echo "  ...applied successfully.\n";
        } else {
            echo "Migration already applied: {$filename}\n";
        }
    }

    echo "Migrations finished.\n";
}

// Run migrations if the script is executed directly
if (php_sapi_name() === 'cli' && basename(__FILE__) == basename($_SERVER['PHP_SELF'])) {
    run_migrations();
}