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<?php
/* --------------------------------------------------------------
   SessionTimeoutAjaxController.inc.php 2016-11-10
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2016 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

MainFactory::load_class('AdminHttpViewController');

/**
 * Class SessionTimeoutAjaxController
 *
 * @category System
 * @package  AdminHttpViewControllers
 */
class SessionTimeoutAjaxController extends AdminHttpViewController
{
    /**
     * @return JsonHttpControllerResponse
     */
    public function actionDefault()
    {
        $sessionMaxLifetime = @(int)ini_get('session.gc_maxlifetime');
        
        $serverSetting = $sessionMaxLifetime !== 0 ? $sessionMaxLifetime : 1440;
        $userSetting   = (int)SESSION_TIMEOUT * 60;
        
        if(array_key_exists('last_activity', $_SESSION)
           && $_SERVER['REQUEST_TIME'] - $_SESSION['last_activity'] > $userSetting
        )
        {
            session_unset();
            session_destroy();
            
            return MainFactory::create('JsonHttpControllerResponse', ['logout' => true]);
        }
        
        if($serverSetting < $userSetting)
        {
            $x = $userSetting;
            $y = $serverSetting;
            
            while($y !== 0)
            {
                $tmp = $x % $y;
                $x   = $y;
                $y   = $tmp;
            }
            
            if($x === $serverSetting)
            {
                $timeout = ($x - .5) * 1000;
            }
            else
            {
                $timeout = ($x + .5) * 1000;
            }
        }
        else
        {
            $timeout = ($userSetting + .5) * 1000;
        }
        
        return MainFactory::create('JsonHttpControllerResponse',
                                   ['data' => [(int)$timeout, $_SESSION['last_activity']]]);
    }
}