<?php
/*
* 2007-2013 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2013 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

/**
 * Manage session for install script
 */
class InstallSession
{
	protected static $_instance;
	protected static $_cookie_mode = false;
	protected static $_cookie = false;

	public static function getInstance()
	{
		if (!self::$_instance)
			self::$_instance = new self();
		return self::$_instance;
	}

	public function __construct()
	{
		session_name('install_'.md5($_SERVER['HTTP_HOST']));
		$session_started = session_start();
		if (!($session_started)
		|| (!isset($_SESSION['session_mode']) && (isset($_GET['_']) || isset($_POST['submitNext']) || isset($_POST['submitPrevious']) || isset($_POST['language']))))
		{
			InstallSession::$_cookie_mode = true;
			InstallSession::$_cookie = new Cookie('ps_install', null, time() + 7200, null, true);
		}
		if ($session_started && !isset($_SESSION['session_mode']))
		{
			$_SESSION['session_mode'] = 'session';
			session_write_close();
		}
	}

	public function clean()
	{
		if (InstallSession::$_cookie_mode)
			InstallSession::$_cookie->logout();
		else
			foreach ($_SESSION as $k => $v)
				unset($_SESSION[$k]);
	}

	public function &__get($varname)
	{
		if (InstallSession::$_cookie_mode)
		{
			$ref = InstallSession::$_cookie->{$varname};
			if (0 === strncmp($ref, 'serialized_array:', strlen('serialized_array:')))
				$ref = unserialize(substr($ref, strlen('serialized_array:')));
		}
		else
		{
			if (isset($_SESSION[$varname]))
				$ref = &$_SESSION[$varname];
			else
			{
				$null = null;
				$ref = &$null;
			}
		}
		return $ref;
	}

	public function __set($varname, $value)
	{
		if (InstallSession::$_cookie_mode)
		{
			if ($varname == 'xml_loader_ids')
				return;
			if (is_array($value))
				$value = 'serialized_array:'.serialize($value);
			InstallSession::$_cookie->{$varname} = $value;
		}
		else
			$_SESSION[$varname] = $value;
	}

	public function __isset($varname)
	{
		if (InstallSession::$_cookie_mode)
			return isset(InstallSession::$_cookie->{$varname});
		else
			return isset($_SESSION[$varname]);
	}

	public function __unset($varname)
	{
		if (InstallSession::$_cookie_mode)
			unset(InstallSession::$_cookie->{$varname});
		else
			unset($_SESSION[$varname]);
	}
}
