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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\WebAsset\AssetItem;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Document\Document;
use Joomla\CMS\Factory;
use Joomla\CMS\Router\Route;
use Joomla\CMS\WebAsset\WebAssetAttachBehaviorInterface;
use Joomla\CMS\WebAsset\WebAssetItem;

/**
 * Web Asset Item class for Keepalive asset
 *
 * @since  4.0.0
 */
class KeepaliveAssetItem extends WebAssetItem implements WebAssetAttachBehaviorInterface
{
	/**
	 * Method called when asset attached to the Document.
	 * Useful for Asset to add a Script options.
	 *
	 * @param   Document  $doc  Active document
	 *
	 * @return void
	 *
	 * @since   4.0.0
	 */
	public function onAttachCallback(Document $doc)
	{
		$app            = Factory::getApplication();
		$sessionHandler = $app->get('session_handler', 'database');

// If the handler is not 'Database', we set a fixed, small refresh value (here: 5 min)
		$refreshTime = 300;

if ($sessionHandler === 'database')
		{
			$lifeTime    = $app->getSession()->getExpire();
			$refreshTime = $lifeTime <= 60 ? 45 : $lifeTime - 60;

// The longest refresh period is one hour to prevent integer overflow.
			if ($refreshTime > 3600 || $refreshTime <= 0)
			{
				$refreshTime = 3600;
			}
		}

// If we are in the frontend or logged in as a user, we can use the ajax component to reduce the load
		$uri = 'index.php' . ($app->isClient('site') || !Factory::getUser()->guest ? '?option=com_ajax&format=json' : '');

// Add keepalive script options.
		$doc->addScriptOptions('system.keepalive', array('interval' => $refreshTime * 1000, 'uri' => Route::_($uri)));
	}
}