<?php
namespace Aisentic\Database;

defined( 'ABSPATH' ) || exit;

/**
 * Abstract Migration class.
 *
 * All migrations should extend this class and implement the up and down methods.
 */
abstract class Migration {
	/**
	 * Serial number for determining execution order. Lower runs first.
	 *
	 * @var int
	 */
	protected int $serial;

	/**
	 * Plugin version when this migration was written.
	 *
	 * @var string
	 */
	protected string $version;

	/**
	 * Get the serial number.
	 *
	 * @return int
	 */
	public function get_serial(): int {
		return $this->serial;
	}

	/**
	 * Get the version.
	 *
	 * @return string
	 */
	public function get_version(): string {
		return $this->version;
	}

	/**
	 * Run the migrations.
	 *
	 * This method should contain the logic to create tables or modify the database schema.
	 *
	 * @return void
	 */
	abstract public function up();

	/**
	 * Reverse the migrations.
	 *
	 * This method should contain the logic to drop tables or rollback schema changes made in the up method.
	 *
	 * @return void
	 */
	abstract public function down();
}