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

try {
    // First, ensure the database exists
    $pdo = new PDO('mysql:host=' . DB_HOST, DB_USER, DB_PASS, [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
    ]);
    $pdo->exec("CREATE DATABASE IF NOT EXISTS " . DB_NAME);

    // Now, connect to the actual database
    $pdo = db();
    echo "Successfully connected to database: " . DB_NAME . "\n";

    // 1. Create migrations tracking table if it doesn't exist
    $pdo->exec("CREATE TABLE IF NOT EXISTS `migrations` (
        `migration` VARCHAR(255) NOT NULL,
        PRIMARY KEY (`migration`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    // 2. Get all migrations that have been run
    $run_migrations_stmt = $pdo->query("SELECT `migration` FROM `migrations`");
    $run_migrations = $run_migrations_stmt->fetchAll(PDO::FETCH_COLUMN);

    // 3. Get all available migration files
    $migration_files = glob(__DIR__ . '/migrations/*.sql');
    sort($migration_files);

    $migrations_run_this_time = 0;

    // 4. Loop through files and run any new migrations
    foreach ($migration_files as $file) {
        $migration_name = basename($file);
        if (!in_array($migration_name, $run_migrations)) {
            echo "Running migration: " . $migration_name . "...\n";
            
            $sql = file_get_contents($file);
            $pdo->exec($sql);

            // Record the migration
            $stmt = $pdo->prepare("INSERT INTO `migrations` (`migration`) VALUES (?)");
            $stmt->execute([$migration_name]);
            
            echo "  -> Success.\n";
            $migrations_run_this_time++;
        }
    }

    if ($migrations_run_this_time === 0) {
        echo "All migrations are up to date.\n";
    } else {
        echo "Finished running " . $migrations_run_this_time . " new migration(s).\n";
    }

} catch (PDOException $e) {
    die("Migration failed: " . $e->getMessage() . "\n");
}