<?php
/**
 * Mirasvit
 *
 * This source file is subject to the Mirasvit Software License, which is available at https://mirasvit.com/license/.
 * Do not edit or add to this file if you wish to upgrade the to newer versions in the future.
 * If you wish to customize this module for your needs.
 * Please refer to http://www.magentocommerce.com for more information.
 *
 * @category  Mirasvit
 * @package   mirasvit/module-cache-warmer
 * @version   1.11.13
 * @copyright Copyright (C) 2026 Mirasvit (https://mirasvit.com/)
 */


declare(strict_types=1);

namespace Mirasvit\CacheWarmer\Service;

use Magento\Framework\App\ObjectManager;

class PageCacheIdService
{
    private const IDENTIFIER_INTERFACE = '\Magento\Framework\App\PageCache\IdentifierInterface';
    private const IDENTIFIER_CLASS = '\Magento\Framework\App\PageCache\Identifier';

    public function getValue(): ?string
    {
        $objectManager = ObjectManager::getInstance();

        if (interface_exists(self::IDENTIFIER_INTERFACE)) {

            return $this->getIdentifierValue($objectManager->get(self::IDENTIFIER_INTERFACE));
        }

        return $this->getIdentifierValue($objectManager->get(self::IDENTIFIER_CLASS));
    }

    private function getIdentifierValue(object $identifier): ?string
    {
        return method_exists($identifier, 'getValue') ? $identifier->getValue() : null;
    }
}