<?php
namespace Amoforms\Libs\AbTests;

use Amoforms\Traits\Getter;
use Amoforms\Traits\Singleton;

/**
 * Class AbTests
 * @since 2.18.7
 * @method static BaseAbTest instance
 * @package Amoforms\Libs\AbTests
 */
abstract class BaseAbTest
{
	use Singleton;
	use Getter;

	const TEST_NAME = NULL; // override this

	const KEY_START_DATE = 'start_date';
	const KEY_VARIANT = 'variant';

	/**
	 * @var AbTestsManager
	 */
	private $_manager;

	/**
	 * @var array
	 */
	protected $_variants = [
		// fill this
	];

	/**
	 * @var array
	 */
	private $_data = [];


	protected function __construct()
	{
		$this->_manager = AbTestsManager::instance();
		$this->set_data($this->get_db_data());
		$this->init();
	}

	/**
	 * Initialize test settings
	 * @since 2.18.7
	 */
	protected function init()
	{
		// use it for test initialization
	}

	/**
	 * @since 2.18.7
	 * @return array
	 */
	private function get_db_data()
	{
		$all_data = $this->_manager->get_all_tests_data();
		$data = isset($all_data[static::TEST_NAME]) ? $all_data[static::TEST_NAME] : [];

		return $data;
	}

	/**
	 * @since 2.18.7
	 * @param array $data
	 * @return $this
	 */
	protected function set_data(array $data)
	{
		$this->_data = $data;

		return $this;
	}

	/**
	 * @since 2.18.7
	 * @return mixed|null
	 */
	public function get_current_variant()
	{
		return $this->_get('variant');
	}

	/**
	 * @since 2.18.7
	 * @param array $variants
	 * @return mixed
	 */
	protected function select_random_variant(array $variants)
	{
		$variants = array_values($variants);
		$key = mt_rand(0, count($variants) - 1);

		return $variants[$key];
	}

	/**
	 * @since 2.18.7
	 * @param mixed $variant
	 * @return array
	 */
	protected function make_test_data($variant)
	{
		return [
			self::KEY_START_DATE => time(),
			self::KEY_VARIANT    => $variant,
		];
	}

	/**
	 * @since 2.18.7
	 * @return bool
	 */
	protected function save()
	{
		return $this->_manager->save_test_data(static::TEST_NAME, $this->_get());
	}
}