<?php
/*
* 2007-2012 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  2007-2012 PrestaShop SA
*  @version  Release: $Revision: 16994 $
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class ToolsCore
{
	protected static $_forceCompile = null;
	protected static $_caching = null;

	/**
	 * Random password generator
	 *
	 * @param integer $length Desired length (optional)
	 * @return string Password
	 */
	public static function passwdGen($length = 8)
	{
		$str = 'abcdefghijkmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
		for ($i = 0, $passwd = ''; $i < $length; $i++)
			$passwd .= self::substr($str, mt_rand(0, self::strlen($str) - 1), 1);
		return $passwd;
	}

	/**
	 * Redirect user to another page
	 *
	 * @param string $url Desired URL
	 * @param string $baseUri Base URI (optional)
	 */
	public static function redirect($url, $baseUri = __PS_BASE_URI__)
	{
		if (strpos($url, 'http://') === false && strpos($url, 'https://') === false)
		{
			global $link;
			if (strpos($url, $baseUri) !== false && strpos($url, $baseUri) == 0)
				$url = substr($url, strlen($baseUri));
			$explode = explode('?', $url, 2);
			// don't use ssl if url is home page
			// used when logout for example
			$useSSL = !empty($url);
			$url = $link->getPageLink($explode[0], $useSSL);
			if (isset($explode[1]))
				$url .= '?'.$explode[1];
			$baseUri = '';
		}

		if (isset($_SERVER['HTTP_REFERER']) && ($url == $_SERVER['HTTP_REFERER']))
			header('Location: '.$_SERVER['HTTP_REFERER']);
		else
			header('Location: '.$baseUri.$url);
		exit;
	}

	/**
	 * Redirect url wich allready PS_BASE_URI
	 *
	 * @param string $url Desired URL
	 */
	public static function redirectLink($url)
	{
		if (!preg_match('@^https?://@i', $url))
		{
			global $link;

			if (strpos($url, __PS_BASE_URI__) !== FALSE && strpos($url, __PS_BASE_URI__) == 0)
				$url = substr($url, strlen(__PS_BASE_URI__));
			$explode = explode('?', $url, 2);
			$url = $link->getPageLink($explode[0]);
			if (isset($explode[1]))
				$url .= '?'.$explode[1];
		}

		header('Location: '.$url);
		exit;
	}

	/**
	 * Redirect user to another admin page
	 *
	 * @param string $url Desired URL
	 */
	public static function redirectAdmin($url)
	{
		header('Location: '.$url);
		exit;
	}

	/**
	 * getProtocol return the set protocol according to configuration (http[s])
	 * @param Boolean true if require ssl
	 * @return String (http|https)
	 */
	public static function getProtocol($use_ssl = null)
	{
		return (!is_null($use_ssl) && $use_ssl ? 'https://' : 'http://');
	}

	/**
	 * getHttpHost return the <b>current</b> host used, with the protocol (http or https) if $http is true
	 * This function should not be used to choose http or https domain name.
	 * Use Tools::getShopDomain() or Tools::getShopDomainSsl instead
	 *
	 * @param boolean $http
	 * @param boolean $entities
	 * @return string host
	 */
	public static function getHttpHost($http = false, $entities = false)
	{
		$host = (isset($_SERVER['HTTP_X_FORWARDED_HOST']) ? $_SERVER['HTTP_X_FORWARDED_HOST'] : $_SERVER['HTTP_HOST']);
		if ($entities)
			$host = htmlspecialchars($host, ENT_COMPAT, 'UTF-8');
		if ($http)
			$host = (_PS_SSL_ENABLED_ ? 'https://' : 'http://').$host;
		return $host;
	}

	/**
	 * getShopDomain returns domain name according to configuration and ignoring ssl
	 *
	 * @param boolean $http if true, return domain name with protocol
	 * @param boolean $entities if true,
	 * @return string domain
	 */
	public static function getShopDomain($http = false, $entities = false)
	{
		if (!($domain = _PS_SHOP_DOMAIN_))
			$domain = self::getHttpHost();
		if ($entities)
			$domain = htmlspecialchars($domain, ENT_COMPAT, 'UTF-8');
		if ($http)
			$domain = 'http://'.$domain;
		return $domain;
	}

	/**
	 * getShopDomainSsl returns domain name according to configuration and depending on ssl activation
	 *
	 * @param boolean $http if true, return domain name with protocol
	 * @param boolean $entities if true,
	 * @return string domain
	 */
	public static function getShopDomainSsl($http = false, $entities = false)
	{
		if (!($domain = _PS_SHOP_DOMAIN_SSL_))
			$domain = self::getHttpHost();
		if ($entities)
			$domain = htmlspecialchars($domain, ENT_COMPAT, 'UTF-8');
		if ($http)
			$domain = (_PS_SSL_ENABLED_ ? 'https://' : 'http://').$domain;
		return $domain;
	}

	/**
	 * Get the server variable SERVER_NAME
	 *
	 * @return string server name
	 */
	static function getServerName()
	{
		if (isset($_SERVER['HTTP_X_FORWARDED_SERVER']) && $_SERVER['HTTP_X_FORWARDED_SERVER'])
			return $_SERVER['HTTP_X_FORWARDED_SERVER'];
		return $_SERVER['SERVER_NAME'];
	}

	/**
	 * Get the server variable REMOTE_ADDR, or the first ip of HTTP_X_FORWARDED_FOR (when using proxy)
	 *
	 * @return string $remote_addr ip of client
	 */
	static function getRemoteAddr()
	{
		// This condition is necessary when using CDN, don't remove it.
		if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] &&
			(!isset($_SERVER['REMOTE_ADDR']) || preg_match('/^127\..*/i', trim($_SERVER['REMOTE_ADDR'])) ||
				preg_match('/^172\.16.*/i', trim($_SERVER['REMOTE_ADDR'])) || preg_match('/^192\.168\.*/i', trim($_SERVER['REMOTE_ADDR'])) ||
				preg_match('/^10\..*/i', trim($_SERVER['REMOTE_ADDR']))))
		{
			if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ','))
			{
				$ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
				return $ips[0];
			}
			return $_SERVER['HTTP_X_FORWARDED_FOR'];
		}
		return $_SERVER['REMOTE_ADDR'];
	}

	/**
	 * Check if the current page use SSL connection on not
	 *
	 * @return bool uses SSL
	 */
	public static function usingSecureMode()
	{
		if (isset($_SERVER['HTTPS']))
			return ($_SERVER['HTTPS'] == 1 || strtolower($_SERVER['HTTPS']) == 'on');
		// $_SERVER['SSL'] exists only in some specific configuration
		if (isset($_SERVER['SSL']))
			return ($_SERVER['SSL'] == 1 || strtolower($_SERVER['SSL']) == 'on');

		return false;
	}

	/**
	 * Get the current url prefix protocol (https/http)
	 *
	 * @return string protocol
	 */
	public static function getCurrentUrlProtocolPrefix()
	{
		if (self::usingSecureMode())
			return 'https://';
		return 'http://';
	}

	/**
	 * Secure an URL referrer
	 *
	 * @param string $referrer URL referrer
	 * @return secured referrer
	 */
	public static function secureReferrer($referrer)
	{
		if (preg_match('/^http[s]?:\/\/'.self::getServerName().'(:'._PS_SSL_PORT_.')?\/.*$/Ui', $referrer))
			return $referrer;
		return __PS_BASE_URI__;
	}

	/**
	 * Get a value from $_POST / $_GET
	 * if unavailable, take a default value
	 *
	 * @param string $key Value key
	 * @param mixed $defaultValue (optional)
	 * @return mixed Value
	 */
	public static function getValue($key, $defaultValue = false)
	{
	 	if (!is_string($key))
			return false;
		$ret = (isset($_POST[$key]) ? $_POST[$key] : (isset($_GET[$key]) ? $_GET[$key] : $defaultValue));

		if (is_string($ret))
			$ret = stripslashes(urldecode(preg_replace('/((\%5C0+)|(\%00+))/i', '', urlencode($ret))));
		elseif (is_array($ret))
			$ret = Tools::getArrayValue($ret);

		return $ret;
	}

	/**
	 * Escape values contained in an array
	 *
	 * @param array $array Value array
	 * @return mixed Value
	 */
	public static function getArrayValue($array)
	{
		foreach ($array as &$row)
			$row = is_array($row) ? Tools::getArrayValue($row) : stripslashes(urldecode(preg_replace('/((\%5C0+)|(\%00+))/i', '', urlencode($row))));
		return $array;
	}

	public static function getIsset($key)
	{
	 	if (!is_string($key))
			return false;
	 	return isset($_POST[$key]) || isset($_GET[$key]);
	}

	/**
	 * Change language in cookie while clicking on a flag
	 *
	 * @return string iso code
	 */
	public static function setCookieLanguage()
	{
		global $cookie;

		/* If language does not exist or is disabled, erase it */
		if ($cookie->id_lang)
		{
			$lang = new Language((int)$cookie->id_lang);
			if (!Validate::isLoadedObject($lang) || !$lang->active)
				$cookie->id_lang = NULL;
		}

		/* Automatically detect language if not already defined */
		if (!$cookie->id_lang && isset($_SERVER['HTTP_ACCEPT_LANGUAGE']))
		{
			$array = explode(',', self::strtolower($_SERVER['HTTP_ACCEPT_LANGUAGE']));
			if (self::strlen($array[0]) > 2)
			{
				$tab = explode('-', $array[0]);
				$string = $tab[0];
			}
			else
				$string = $array[0];
			if (Validate::isLanguageIsoCode($string))
			{
				$lang = new Language((int)(Language::getIdByIso($string)));
				if (Validate::isLoadedObject($lang) && $lang->active)
					$cookie->id_lang = (int)($lang->id);
			}
		}

		/* If language file not present, you must use default language file */
		if (!$cookie->id_lang || !Validate::isUnsignedId($cookie->id_lang))
			$cookie->id_lang = (int)(_PS_LANG_DEFAULT_);

		$iso = Language::getIsoById((int)$cookie->id_lang);
		@include_once(_PS_THEME_DIR_.'lang/'.$iso.'.php');

		return $iso;
	}

	/**
	 * Set cookie id_lang
	 */
	public static function switchLanguage()
	{
		global $cookie;

		$id_lang = (int)self::getValue('id_lang');
		if ($id_lang && Validate::isUnsignedId($id_lang))
			$cookie->id_lang = $id_lang;
	}

	/**
	 * Set cookie currency from POST or default currency
	 *
	 * @return Currency object
	 */
	public static function setCurrency()
	{
		global $cookie;

		if (self::isSubmit('SubmitCurrency') && isset($_POST['id_currency']) && is_numeric($_POST['id_currency']))
		{
			$currency = Currency::getCurrencyInstance((int)$_POST['id_currency']);
			if ($currency->id && !$currency->deleted && $currency->active)
			{
				$cookie->id_currency = (int)$currency->id;
				return $currency;
			}
		}

		if ((int)$cookie->id_currency)
		{
			$currency = Currency::getCurrencyInstance((int)$cookie->id_currency);
			if ((int)$currency->id && !$currency->deleted && $currency->active)
				return $currency;
		}
		$currency = Currency::getCurrencyInstance((int)_PS_CURRENCY_DEFAULT_);
		if ($currency->id)
			$cookie->id_currency = (int)$currency->id;
		return $currency;
	}

	/**
	 * Return price with currency sign for a given product
	 *
	 * @param float $price Product price
	 * @param object $currency Current currency (object, id_currency, NULL => getCurrent())
	 * @return string Price correctly formated (sign, decimal separator...)
	 */
	public static function displayPrice($price, $currency = null, $no_utf8 = false)
	{
		if ($currency === null)
			$currency = Currency::getCurrent();
		/* if you modified this function, don't forget to modify the Javascript function formatCurrency (in tools.js) */
		if (is_int($currency))
			$currency = Currency::getCurrencyInstance((int)$currency);

		if (is_array($currency))
		{
			$c_char = $currency['sign'];
			$c_format = $currency['format'];
			$c_decimals = (int)$currency['decimals'] * _PS_PRICE_DISPLAY_PRECISION_;
			$c_blank = $currency['blank'];
		}
		elseif (is_object($currency))
		{
			$c_char = $currency->sign;
			$c_format = $currency->format;
			$c_decimals = (int)$currency->decimals * _PS_PRICE_DISPLAY_PRECISION_;
			$c_blank = $currency->blank;
		}
		else
			return false;

		$blank = ($c_blank ? ' ' : '');
		$ret = 0;
		if (($isNegative = ($price < 0)))
			$price *= -1;
		$price = self::ps_round($price, $c_decimals);
		switch ($c_format)
	 	{
	 	 	/* X 0,000.00 */
	 	 	case 1:
				$ret = $c_char.$blank.number_format($price, $c_decimals, '.', ',');
				break;
				/* 0 000,00 X*/
			case 2:
				$ret = number_format($price, $c_decimals, ',', ' ').$blank.$c_char;
				break;
				/* X 0.000,00 */
			case 3:
				$ret = $c_char.$blank.number_format($price, $c_decimals, ',', '.');
				break;
				/* 0,000.00 X */
			case 4:
				$ret = number_format($price, $c_decimals, '.', ',').$blank.$c_char;
				break;
		}
		if ($isNegative)
			$ret = '-'.$ret;
		if ($no_utf8)
			return str_replace(array('€', '£', '¥'), array(chr(128), chr(163), chr(165)), $ret);
		return $ret;
	}

	public static function displayPriceSmarty($params, &$smarty)
	{
		if (array_key_exists('currency', $params))
		{
			$currency = Currency::getCurrencyInstance((int)($params['currency']));
			if (Validate::isLoadedObject($currency))
				return self::displayPrice($params['price'], $currency, false);
		}
		return self::displayPrice($params['price']);
	}

	/**
	 * Return price converted
	 *
	 * @param float $price Product price
	 * @param object $currency Current currency object
	 * @param boolean $to_currency convert to currency or from currency to default currency
	 */
	public static function convertPrice($price, $currency = null, $to_currency = true)
	{
		if ($currency === null)
			$currency = Currency::getCurrent();
		elseif (is_numeric($currency))
			$currency = Currency::getCurrencyInstance($currency);
		
		if (isset($currency->id))
		{
			$c_id = $currency->id;
			$c_rate = $currency->conversion_rate;
		}
		else
		{
			$c_id = $currency['id_currency'];
			$c_rate = $currency['conversion_rate'];
		}

		if ($c_id != (int)_PS_CURRENCY_DEFAULT_)
			$price = $to_currency ? ($price * $c_rate) : ($price / $c_rate);

		return $price;
	}

	/**
	 * Display date regarding to language preferences
	 *
	 * @param array $params Date, format...
	 * @param object $smarty Smarty object for language preferences
	 * @return string Date
	 */
	public static function dateFormat($params, &$smarty)
	{
		return self::displayDate($params['date'], $smarty->ps_language->id, (isset($params['full']) ? $params['full'] : false));
	}

	/**
	 * Display date regarding to language preferences
	 *
	 * @param string $date Date to display format UNIX
	 * @param integer $id_lang Language id
	 * @param boolean $full With time or not (optional)
	 * @return string Date
	 */
	public static function displayDate($date, $id_lang, $full = false, $separator = '-')
	{
	 	if (!$date || !($time = strtotime($date)))
	 		return $date;

		if (!Validate::isDate($date) || !Validate::isBool($full))
			die(self::displayError('Invalid date'));

		$language = Language::getLanguage((int)$id_lang);
		return date($full ? $language['date_format_full'] : $language['date_format_lite'], $time);
	}

	/**
	 * Sanitize a string
	 *
	 * @param string $string String to sanitize
	 * @param boolean $full String contains HTML or not (optional)
	 * @return string Sanitized string
	 */
	public static function safeOutput($string, $html = false)
	{
	 	if (!$html)
			$string = strip_tags($string);
		return @Tools::htmlentitiesUTF8($string, ENT_QUOTES);
	}

	public static function htmlentitiesUTF8($string, $type = ENT_QUOTES)
	{
		if (is_array($string))
			return array_map(array('Tools', 'htmlentitiesUTF8'), $string);
		return htmlentities($string, $type, 'utf-8');
	}

	public static function htmlentitiesDecodeUTF8($string)
	{
		if (is_array($string))
			return array_map(array('Tools', 'htmlentitiesDecodeUTF8'), $string);
		return html_entity_decode($string, ENT_QUOTES, 'utf-8');
	}

	public static function safePostVars()
	{
		$_POST = array_map(array('Tools', 'htmlentitiesUTF8'), $_POST);
	}

	/**
	 * Delete directory and subdirectories
	 *
	 * @param string $dirname Directory name
	 */
	public static function deleteDirectory($dirname, $delete_self = true)
	{
		$dirname = rtrim($dirname, '/').'/';
		$files = scandir($dirname);
		foreach ($files as $file)
			if ($file != '.' && $file != '..')
			{
				if (is_dir($dirname.$file))
					self::deleteDirectory($dirname.$file, true);
				elseif (file_exists($dirname.$file))
					unlink($dirname.$file);
			}
		if ($delete_self)
			rmdir($dirname);
	}

	/**
	 * Display an error according to an error code
	 *
	 * @param string $string Error message
	 * @param boolean $htmlentities By default at true for parsing error message with htmlentities
	 */
	public static function displayError($string = 'Fatal error', $htmlentities = true)
	{
		global $_ERRORS, $cookie;

		$iso = strtolower(Language::getIsoById((is_object($cookie) && $cookie->id_lang) ? (int)$cookie->id_lang : (int)Configuration::get('PS_LANG_DEFAULT')));
		@include_once(_PS_TRANSLATIONS_DIR_.$iso.'/errors.php');

		if (defined('_PS_MODE_DEV_') && _PS_MODE_DEV_ && $string == 'Fatal error')
			return ('<pre>'.print_r(debug_backtrace(), true).'</pre>');
		if (!is_array($_ERRORS))
			return str_replace('"', '&quot;', $string);
		$key = md5(str_replace('\'', '\\\'', $string));
		$str = (is_array($_ERRORS) && array_key_exists($key, $_ERRORS)) ? ($htmlentities ? htmlentities($_ERRORS[$key], ENT_COMPAT, 'UTF-8') : $_ERRORS[$key]) : $string;
		return str_replace('"', '&quot;', stripslashes($str));
	}

	/**
	 * Display an error with detailed object
	 *
	 * @param mixed $object
	 * @param boolean $kill
	 * @return $object if $kill = false;
	 */
	public static function dieObject($object, $kill = true)
	{
		echo '<pre style="text-align: left;">';
		print_r($object);
		echo '</pre><br />';
		if ($kill)
			die('END');
		return $object;
	}

	/**
	 * ALIAS OF dieObject() - Display an error with detailed object
	 *
	 * @param object $object Object to display
	 */
	public static function d($object, $kill = true)
	{
		return (self::dieObject($object, $kill));
	}

	/**
	 * ALIAS OF dieObject() - Display an error with detailed object but don't stop the execution
	 *
	 * @param object $object Object to display
	 */
	public static function p($object)
	{
		return (self::dieObject($object, false));
	}

	/**
	 * Check if submit has been posted
	 *
	 * @param string $submit submit name
	 */
	public static function isSubmit($submit)
	{
		return (isset($_POST[$submit]) || isset($_POST[$submit.'_x']) || isset($_POST[$submit.'_y'])
			|| isset($_GET[$submit]) || isset($_GET[$submit.'_x']) || isset($_GET[$submit.'_y']));
	}

	/**
	 * Get meta tages for a given page
	 *
	 * @param integer $id_lang Language id
	 * @return array Meta tags
	 */
	public static function getMetaTags($id_lang, $page_name, $title = '')
	{
		global $maintenance;

		if (!(isset($maintenance) && (!in_array(self::getRemoteAddr(), explode(',', Configuration::get('PS_MAINTENANCE_IP'))))))
		{
		 	/* Products specifics meta tags */
			if ($id_product = self::getValue('id_product'))
			{
				$row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
				SELECT `name`, `meta_title`, `meta_description`, `meta_keywords`, `description_short`
				FROM `'._DB_PREFIX_.'product` p
				LEFT JOIN `'._DB_PREFIX_.'product_lang` pl ON (pl.`id_product` = p.`id_product`)
				WHERE pl.id_lang = '.(int)($id_lang).' AND pl.id_product = '.(int)($id_product).' AND p.active = 1');
				if ($row)
				{
					if (empty($row['meta_description']))
						$row['meta_description'] = strip_tags($row['description_short']);
					return self::completeMetaTags($row, $row['name']);
				}
			}

			/* Categories specifics meta tags */
			elseif ($id_category = self::getValue('id_category'))
			{
				if (!empty($title))
					$title = ' - '.$title;
				$page_number = (int)self::getValue('p');
				$row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
				SELECT `name`, `meta_title`, `meta_description`, `meta_keywords`, `description`
				FROM `'._DB_PREFIX_.'category_lang`
				WHERE id_lang = '.(int)$id_lang.' AND id_category = '.(int)$id_category);
				if ($row)
				{
					if (empty($row['meta_description']))
						$row['meta_description'] = strip_tags($row['description']);

					// Paginate title
					if (!empty($row['meta_title']))
						$row['meta_title'] = $title.$row['meta_title'].(!empty($page_number) ? ' ('.$page_number.')' : '').' - '.Configuration::get('PS_SHOP_NAME');
					else
						$row['meta_title'] = $row['name'].(!empty($page_number) ? ' ('.$page_number.')' : '').' - '.Configuration::get('PS_SHOP_NAME');

					if (!empty($title))
						$row['meta_title'] = $title.(!empty($page_number) ? ' ('.$page_number.')' : '').' - '.Configuration::get('PS_SHOP_NAME');

					return self::completeMetaTags($row, $row['name']);
				}
			}

			/* Manufacturers specifics meta tags */
			elseif ($id_manufacturer = self::getValue('id_manufacturer'))
			{
				$page_number = (int)self::getValue('p');
				$row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
				SELECT `name`, `meta_title`, `meta_description`, `meta_keywords`
				FROM `'._DB_PREFIX_.'manufacturer_lang` ml
				LEFT JOIN `'._DB_PREFIX_.'manufacturer` m ON (ml.`id_manufacturer` = m.`id_manufacturer`)
				WHERE ml.id_lang = '.(int)($id_lang).' AND ml.id_manufacturer = '.(int)($id_manufacturer));
				if ($row)
				{
					if (empty($row['meta_description']))
						$row['meta_description'] = strip_tags($row['meta_description']);
					$row['meta_title'] .= (empty($row['meta_title']) ? $row['name'] : '').(!empty($page_number) ? ' ('.$page_number.')' : '');
					$row['meta_title'] .= ' - '.Configuration::get('PS_SHOP_NAME');
					return self::completeMetaTags($row, $row['meta_title']);
				}
			}

			/* Suppliers specifics meta tags */
			elseif ($id_supplier = self::getValue('id_supplier'))
			{
				$row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
				SELECT `name`, `meta_title`, `meta_description`, `meta_keywords`
				FROM `'._DB_PREFIX_.'supplier_lang` sl
				LEFT JOIN `'._DB_PREFIX_.'supplier` s ON (sl.`id_supplier` = s.`id_supplier`)
				WHERE sl.id_lang = '.(int)$id_lang.' AND sl.id_supplier = '.(int)$id_supplier);

				if ($row)
				{
					if (empty($row['meta_description']))
						$row['meta_description'] = strip_tags($row['meta_description']);
					if (!empty($row['meta_title']))
						$row['meta_title'] = $row['meta_title'].' - '.Configuration::get('PS_SHOP_NAME');
					return self::completeMetaTags($row, $row['name']);
				}
			}

			/* CMS specifics meta tags */
			elseif ($id_cms = self::getValue('id_cms'))
			{
				$row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
				SELECT `meta_title`, `meta_description`, `meta_keywords`
				FROM `'._DB_PREFIX_.'cms_lang`
				WHERE id_lang = '.(int)$id_lang.' AND id_cms = '.(int)$id_cms);
				if ($row)
				{
					$row['meta_title'] = $row['meta_title'].' - '.Configuration::get('PS_SHOP_NAME');
					return self::completeMetaTags($row, $row['meta_title']);
				}
			}

			/* CMS category specifics meta tags */
			elseif ($id_cms = self::getValue('id_cms_category'))
			{
				$row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
				SELECT `meta_title`, `meta_description`, `meta_keywords`
				FROM `'._DB_PREFIX_.'cms_category_lang`
				WHERE id_lang = '.(int)$id_lang.' AND id_cms_category = '.(int)$id_cms);
				if ($row)
				{
					$row['meta_title'] = $row['meta_title'].' - '.Configuration::get('PS_SHOP_NAME');
					return self::completeMetaTags($row, $row['meta_title']);
				}
			}
		}

		/* Default meta tags */
		return self::getHomeMetaTags($id_lang, $page_name);
	}

	/**
	 * Get meta tags for a given page
	 *
	 * @param integer $id_lang Language id
	 * @return array Meta tags
	 */
	public static function getHomeMetaTags($id_lang, $page_name)
	{
		/* Metas-tags */
		$metas = Meta::getMetaByPage($page_name, $id_lang);
		$ret['meta_title'] = isset($metas['title']) && $metas['title'] ? $metas['title'].' - '.Configuration::get('PS_SHOP_NAME') : Configuration::get('PS_SHOP_NAME');
		$ret['meta_description'] = isset($metas['description']) && $metas['description'] ? $metas['description'] : '';
		$ret['meta_keywords'] = isset($metas['keywords']) && $metas['keywords'] ? $metas['keywords'] :  '';
		return $ret;
	}


	public static function completeMetaTags($metaTags, $defaultValue)
	{
		global $cookie;

		if (empty($metaTags['meta_title']))
			$metaTags['meta_title'] = $defaultValue.' - '.Configuration::get('PS_SHOP_NAME');
		if (empty($metaTags['meta_description']))
			$metaTags['meta_description'] = Configuration::get('PS_META_DESCRIPTION', (int)($cookie->id_lang)) ? Configuration::get('PS_META_DESCRIPTION', (int)($cookie->id_lang)) : '';
		if (empty($metaTags['meta_keywords']))
			$metaTags['meta_keywords'] = Configuration::get('PS_META_KEYWORDS', (int)($cookie->id_lang)) ? Configuration::get('PS_META_KEYWORDS', (int)($cookie->id_lang)) : '';
		return $metaTags;
	}

	/**
	 * Encrypt password
	 *
	 * @param object $object Object to display
	 */
	public static function encrypt($passwd)
	{
		return md5(pSQL(_COOKIE_KEY_.$passwd));
	}

	/**
	 * Get token to prevent CSRF
	 *
	 * @param string $token token to encrypt
	 */
	public static function getToken($page = true)
	{
		global $cookie;

		if ($page === true)
			return (self::encrypt($cookie->id_customer.$cookie->passwd.$_SERVER['SCRIPT_NAME']));
		return (self::encrypt($cookie->id_customer.$cookie->passwd.$page));
	}

	/**
	 * Encrypt password
	 *
	 * @param object $object Object to display
	 */
	public static function getAdminToken($string)
	{
		return !empty($string) ? self::encrypt($string) : false;
	}

	public static function getAdminTokenLite($tab)
	{
		global $cookie;

		return self::getAdminToken($tab.(int)Tab::getIdFromClassName($tab).(int)$cookie->id_employee);
	}

	/**
	 * Get the user's journey
	 *
	 * @param integer $id_category Category ID
	 * @param string $path Path end
	 * @param boolean $linkOntheLastItem Put or not a link on the current category
	 * @param string [optionnal] $categoryType defined what type of categories is used (products or cms)
	 */
	public static function getPath($id_category, $path = '', $linkOntheLastItem = false, $categoryType = 'products')
	{
		global $link, $cookie;

		if ($id_category == 1)
			return '<span class="navigation_end">'.$path.'</span>';

		$pipe = htmlentities(Configuration::get('PS_NAVIGATION_PIPE'), ENT_QUOTES, 'UTF-8');
		if (empty($pipe))
			$pipe = '>';

		$fullPath = '';
		if ($categoryType == 'products')
		{
			$category = Db::getInstance()->getRow('
			SELECT nleft, nright
			FROM '._DB_PREFIX_.'category
			WHERE id_category = '.(int)$id_category);

			if (isset($category['nleft']))
			{
				$categories = Db::getInstance()->ExecuteS('
				SELECT c.id_category, cl.name, cl.link_rewrite
				FROM '._DB_PREFIX_.'category c
				LEFT JOIN '._DB_PREFIX_.'category_lang cl ON (cl.id_category = c.id_category)
				WHERE c.nleft <= '.(int)$category['nleft'].' AND c.nright >= '.(int)$category['nright'].' AND cl.id_lang = '.(int)$cookie->id_lang.' AND c.id_category != 1
				ORDER BY c.nleft ASC');

				$n = 1;
				$nCategories = count($categories);
				foreach ($categories as $category)
					$fullPath .=
						(($n < $nCategories || $linkOntheLastItem) ? '<a href="'.htmlentities($link->getCategoryLink((int)$category['id_category'], $category['link_rewrite']), ENT_QUOTES, 'UTF-8').'" title="'.htmlentities($category['name'], ENT_QUOTES, 'UTF-8').'">' : '').
						htmlentities($category['name'], ENT_NOQUOTES, 'UTF-8').
						(($n < $nCategories || $linkOntheLastItem) ? '</a>' : '').
						(($n++ != $nCategories || !empty($path)) ? '<span class="navigation-pipe">'.$pipe.'</span>' : '');

				return $fullPath.$path;
			}
		}
		elseif ($categoryType == 'CMS')
		{
			$category = new CMSCategory((int)($id_category), (int)($cookie->id_lang));
			if (!Validate::isLoadedObject($category))
				die(self::displayError());
			$categoryLink = $link->getCMSCategoryLink($category);

			if ($path != $category->name)
				$fullPath .= '<a href="'.self::safeOutput($categoryLink).'">'.htmlentities($category->name, ENT_NOQUOTES, 'UTF-8').'</a><span class="navigation-pipe">'.$pipe.'</span>'.$path;
			else
				$fullPath = ($linkOntheLastItem ? '<a href="'.self::safeOutput($categoryLink).'">' : '').htmlentities($path, ENT_NOQUOTES, 'UTF-8').($linkOntheLastItem ? '</a>' : '');

			return self::getPath((int)$category->id_parent, $fullPath, $linkOntheLastItem, $categoryType);
		}
	}

	/**
	 * @param string [optionnal] $type_cat defined what type of categories is used (products or cms)
	 */
	public static function getFullPath($id_category, $end, $type_cat = 'products')
	{
		global $cookie;

		$pipe = Configuration::get('PS_NAVIGATION_PIPE') ? Configuration::get('PS_NAVIGATION_PIPE') : '>';

		if ($type_cat == 'products')
			$category = new Category((int)$id_category, (int)$cookie->id_lang);
		elseif ($type_cat == 'CMS')
			$category = new CMSCategory((int)$id_category, (int)$cookie->id_lang);

		if (!Validate::isLoadedObject($category))
			$id_category = 1;
		if ($id_category == 1)
			return htmlentities($end, ENT_NOQUOTES, 'UTF-8');

		return self::getPath($id_category, $category->name, true, $type_cat).'<span class="navigation-pipe">'.$pipe.'</span> <span class="navigation_product">'.htmlentities($end, ENT_NOQUOTES, 'UTF-8').'</span>';
	}

	/**
	 * @deprecated
	 */
	public static function getCategoriesTotal()
	{
		self::displayAsDeprecated();
		return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('SELECT COUNT(*) total FROM `'._DB_PREFIX_.'category`');
	}

	/**
	 * @deprecated
	 */
	public static function getProductsTotal()
	{
		Tools::displayAsDeprecated();
		return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('SELECT COUNT(*) total FROM `'._DB_PREFIX_.'product`');
	}

	/**
	 * @deprecated
	 */
	public static function getCustomersTotal()
	{
		Tools::displayAsDeprecated();
		return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('SELECT COUNT(*) total FROM `'._DB_PREFIX_.'customer`');
	}

	/**
	 * @deprecated
	 */
	public static function getOrdersTotal()
	{
		Tools::displayAsDeprecated();
		return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('SELECT COUNT(*) total FROM `'._DB_PREFIX_.'orders`');
	}

	/*
	** Historyc translation function kept for compatibility
	** Removing soon
	*/
	public static function historyc_l($key, $translations)
	{
		global $cookie;

		if (!$translations || !is_array($translations))
			die(self::displayError());
		$iso = strtoupper(Language::getIsoById($cookie->id_lang));
		$lang = key_exists($iso, $translations) ? $translations[$iso] : false;
		return $lang && is_array($lang) && array_key_exists($key, $lang) ? stripslashes($lang[$key]) : $key;
	}


	/**
	 * Return the friendly url from the provided string
	 *
	 * @param string $str
	 * @param bool $utf8_decode => needs to be marked as deprecated
	 * @return string
	 */
	public static function link_rewrite($str, $utf8_decode = false)
	{
		return self::str2url($str);
	}

	/**
	 * Return a friendly url made from the provided string
	 * If the mbstring library is available, the output is the same as the js function of the same name
	 *
	 * @param string $str
	 * @return string
	 */
	public static function str2url($str)
	{
		if (_PS_MB_STRING_)
			$str = mb_strtolower($str, 'utf-8');

		// Remove all non-whitelist chars.
		$str = preg_replace(array('/[^a-zA-Z0-9\s\'\:\/\[\]-]/', '/[\s\'\:\/\[\]-]+/', '/[ ]/', '/[\/]/'),
					 array('', ' ', '-', '-'), self::replaceAccentedChars(trim($str)));

		// If it was not possible to lowercase the string with mb_strtolower, we do it after the transformations.
		// This way we lose fewer special chars.
		if (!_PS_MB_STRING_)
			$str = strtolower($str);

		return $str;
	}

	/**
	 * Replace all accented chars by their equivalent non accented chars.
	 *
	 * @param string $str
	 * @return string
	 */
	public static function replaceAccentedChars($str)
	{
		return preg_replace(
			array(
				'/[\x{0105}\x{0104}\x{00E0}\x{00E1}\x{00E2}\x{00E3}\x{00E4}\x{00E5}]/u',
				'/[\x{00E7}\x{010D}\x{0107}\x{0106}]/u',
				'/[\x{010F}]/u',
				'/[\x{00E8}\x{00E9}\x{00EA}\x{00EB}\x{011B}\x{0119}\x{0118}]/u',
				'/[\x{00EC}\x{00ED}\x{00EE}\x{00EF}]/u',
				'/[\x{0142}\x{0141}\x{013E}\x{013A}]/u',
				'/[\x{00F1}\x{0148}]/u',
				'/[\x{00F2}\x{00F3}\x{00F4}\x{00F5}\x{00F6}\x{00F8}\x{00D3}]/u',
				'/[\x{0159}\x{0155}]/u',
				'/[\x{015B}\x{015A}\x{0161}]/u',
				'/[\x{00DF}]/u',
				'/[\x{0165}]/u',
				'/[\x{00F9}\x{00FA}\x{00FB}\x{00FC}\x{016F}]/u',
				'/[\x{00FD}\x{00FF}]/u',
				'/[\x{017C}\x{017A}\x{017B}\x{0179}\x{017E}]/u',
				'/[\x{00E6}]/u',
				'/[\x{0153}]/u'),
			array('a', 'c', 'd', 'e', 'i', 'l', 'n', 'o', 'r', 's', 'ss', 't', 'u', 'y', 'z', 'ae', 'oe'),
			$str);
	}

	/**
	 * Truncate strings
	 *
	 * @param string $str
	 * @param integer $maxLen Max length
	 * @param string $suffix Suffix optional
	 * @return string $str truncated
	 */
	/* CAUTION : Use it only on module hookEvents.
	** For other purposes use the smarty function instead */
	public static function truncate($str, $maxLen, $suffix = '...')
	{
	 	if (self::strlen($str) <= $maxLen)
	 		return $str;
	 	$str = utf8_decode($str);
	 	return (utf8_encode(substr($str, 0, $maxLen - self::strlen($suffix)).$suffix));
	}

	/**
	 * Generate date form
	 *
	 * @param integer $year Year to select
	 * @param integer $month Month to select
	 * @param integer $day Day to select
	 * @return array $tab html data with 3 cells :['days'], ['months'], ['years']
	 *
	 */
	public static function dateYears()
	{
		for ($i = date('Y') - 10; $i >= 1900; $i--)
			$tab[] = $i;
		return $tab;
	}

	public static function dateDays()
	{
		for ($i = 1; $i != 32; $i++)
			$tab[] = $i;
		return $tab;
	}

	public static function dateMonths()
	{
		for ($i = 1; $i != 13; $i++)
			$tab[$i] = date('F', mktime(0, 0, 0, $i, date('m'), date('Y')));
		return $tab;
	}

	public static function hourGenerate($hours, $minutes, $seconds)
	{
		return implode(':', array($hours, $minutes, $seconds));
	}

	public static function dateFrom($date)
	{
		$tab = explode(' ', $date);
		if (!isset($tab[1]))
			$date .= ' ' . self::hourGenerate(0, 0, 0);
		return $date;
	}

	public static function dateTo($date)
	{
		$tab = explode(' ', $date);
		if (!isset($tab[1]))
			$date .= ' ' . self::hourGenerate(23, 59, 59);
		return $date;
	}

	/**
	 * @deprecated
	 */
	public static function getExactTime()
	{
		Tools::displayAsDeprecated();
		return time() + microtime();
	}

	static function strtolower($str)
	{
		if (is_array($str))
			return false;
		if (_PS_MB_STRING_)
			return mb_strtolower($str, 'utf-8');
		return strtolower($str);
	}

	static function strlen($str, $encoding = 'UTF-8')
	{
		if (is_array($str))
			return false;
		$str = html_entity_decode($str, ENT_COMPAT, 'UTF-8');
		if (_PS_MB_STRING_)
			return mb_strlen($str, $encoding);
		return strlen($str);
	}

	static function stripslashes($string)
	{
		if (_PS_MAGIC_QUOTES_GPC_)
			$string = stripslashes($string);
		return $string;
	}

	static function strtoupper($str)
	{
		if (is_array($str))
			return false;
		if (_PS_MB_STRING_)
			return mb_strtoupper($str, 'utf-8');
		return strtoupper($str);
	}

	static function substr($str, $start, $length = false, $encoding = 'utf-8')
	{
		if (is_array($str))
			return false;
		if (_PS_MB_STRING_)
			return mb_substr($str, (int)($start), ($length === false ? self::strlen($str) : (int)($length)), $encoding);
		return substr($str, $start, ($length === false ? self::strlen($str) : (int)($length)));
	}

	static function ucfirst($str)
	{
		return self::strtoupper(self::substr($str, 0, 1)).self::substr($str, 1);
	}

	public static function orderbyPrice(&$array, $orderWay)
	{
		foreach ($array as &$row)
			$row['price_tmp'] =  Product::getPriceStatic($row['id_product'], true, ((isset($row['id_product_attribute']) AND !empty($row['id_product_attribute'])) ? (int)($row['id_product_attribute']) : NULL), 2);
		if (strtolower($orderWay) == 'desc')
			uasort($array, 'cmpPriceDesc');
		else
			uasort($array, 'cmpPriceAsc');
		foreach ($array as &$row)
			unset($row['price_tmp']);
	}

	public static function iconv($from, $to, $string)
	{
		if (_PS_ICONV_)
			return iconv($from, $to.'//TRANSLIT', str_replace('¥', '&yen;', str_replace('£', '&pound;', str_replace('€', '&euro;', $string))));
		return html_entity_decode(htmlentities($string, ENT_NOQUOTES, $from), ENT_NOQUOTES, $to);
	}

	public static function isEmpty($field)
	{
		return empty($field) || !$field;
	}

	/**
	 * @deprecated
	 **/
	public static function getTimezones($select = false)
	{
		Tools::displayAsDeprecated();

		static $_cache = 0;

		// One select
		if ($select)
		{
			// No cache
			if (!$_cache)
			{
				$tmz = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('SELECT `name` FROM '._DB_PREFIX_.'timezone WHERE id_timezone = '.(int)$select);
				$_cache = $tmz['name'];
			}
			return $_cache;
		}

		// Multiple select
		$tmz = Db::getInstance(_PS_USE_SQL_SLAVE_)->s('SELECT * FROM '._DB_PREFIX_.'timezone');
		$tab = array();
		foreach ($tmz as $timezone)
			$tab[$timezone['id_timezone']] = str_replace('_', ' ', $timezone['name']);
		return $tab;
	}

	/**
	 * @deprecated
	 **/
	public static function ps_set_magic_quotes_runtime($var)
	{
		Tools::displayAsDeprecated();

		if (function_exists('set_magic_quotes_runtime'))
			set_magic_quotes_runtime($var);
	}

	public static function ps_round($value, $precision = 0)
	{
		static $method = null;
		if (!$method)
			$method = (int)Configuration::get('PS_PRICE_ROUND_MODE');
		if ($method == PS_ROUND_UP)
			return self::ceilf($value, $precision);
		elseif ($method == PS_ROUND_DOWN)
			return self::floorf($value, $precision);
		return round($value, $precision);
	}

	public static function ceilf($value, $precision = 0)
	{
		$precisionFactor = $precision == 0 ? 1 : pow(10, $precision);
		$tmp = $value * $precisionFactor;
		$tmp2 = (string)$tmp;
		// If the current value has already the desired precision
		if (strpos($tmp2, '.') === false)
			return ($value);
		if ($tmp2[strlen($tmp2) - 1] == 0)
			return $value;
		return ceil($tmp) / $precisionFactor;
	}

	public static function floorf($value, $precision = 0)
	{
		$precisionFactor = $precision == 0 ? 1 : pow(10, $precision);
		$tmp = $value * $precisionFactor;
		$tmp2 = (string)$tmp;
		// If the current value has already the desired precision
		if (strpos($tmp2, '.') === false)
			return ($value);
		if ($tmp2[strlen($tmp2) - 1] == 0)
			return $value;
		return floor($tmp) / $precisionFactor;
	}

	/**
	 * file_exists() wrapper with cache to speedup performance
	 *
	 * @param string $filename File name
	 * @return boolean Cached result of file_exists($filename)
	 */
	public static function file_exists_cache($filename)
	{
		self::displayAsDeprecated(); /* file_exists already has its own cache */
		return file_exists($filename);
	}

	public static function file_get_contents($url, $useIncludePath = false, $streamContext = NULL, $curlTimeOut = 5)
	{
		if ($streamContext == NULL)
			$streamContext = @stream_context_create(array('http' => array('timeout' => 5)));

		if (in_array(ini_get('allow_url_fopen'), array('On', 'on', '1')))
			return @file_get_contents($url, $useIncludePath, $streamContext);
		elseif (function_exists('curl_init') && in_array(ini_get('allow_url_fopen'), array('On', 'on', '1')))
		{
			$curl = curl_init();
			curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
			curl_setopt($curl, CURLOPT_URL, $url);
			curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $curlTimeOut);
			curl_setopt($curl, CURLOPT_TIMEOUT, $curlTimeOut);
			$content = curl_exec($curl);
			curl_close($curl);
			return $content;
		}
		else
			return false;
	}

	public static function simplexml_load_file($url, $class_name = null)
	{
		if (in_array(ini_get('allow_url_fopen'), array('On', 'on', '1')))
			return simplexml_load_string(Tools::file_get_contents($url), $class_name);
		return false;
	}

	public static $a = 0;
	public static function minifyHTML($html_content)
	{
		if (strlen($html_content) > 0)
		{
			//set an alphabetical order for args
			$html_content = preg_replace_callback('/(<[a-zA-Z0-9]+)((\s?[a-zA-Z0-9]+=[\"\\\'][^\"\\\']*[\"\\\']\s?)*)>/', array('Tools', 'minifyHTMLpregCallback'), $html_content);

			require_once(_PS_TOOL_DIR_.'minify_html/minify_html.class.php');

			return Minify_HTML::minify(str_replace(chr(194).chr(160), '&nbsp;', $html_content), array('xhtml', 'cssMinifier', 'jsMinifier'));
		}
		return false;
	}

	/**
	 * Translates a string with underscores into camel case (e.g. first_name -> firstName)
	 * @prototype string public static function toCamelCase(string $str[, bool $capitaliseFirstChar = false])
	 */
	public static function toCamelCase($str, $capitaliseFirstChar = false)
	{
		$str = strtolower($str);
		if ($capitaliseFirstChar)
			$str = ucfirst($str);
		return preg_replace_callback('/_([a-z])/', create_function('$c', 'return strtoupper($c[1]);'), $str);
	}

	public static function getBrightness($hex)
	{
		$hex = str_replace('#', '', $hex);
		$r = hexdec(substr($hex, 0, 2));
		$g = hexdec(substr($hex, 2, 2));
		$b = hexdec(substr($hex, 4, 2));
		return (($r * 299) + ($g * 587) + ($b * 114)) / 1000;
	}

	public static function minifyHTMLpregCallback($preg_matches)
	{
		$args = array();
		preg_match_all('/[a-zA-Z0-9]+=[\"\\\'][^\"\\\']*[\"\\\']/is', $preg_matches[2], $args);
		$args = $args[0];
		sort($args);

		// if there is no args in the balise, we don't write a space (avoid previous : <title >, now : <title>)
		return empty($args) ? $preg_matches[1].'>' : $preg_matches[1].' '.implode(' ', $args).'>';
	}

	public static function packJSinHTML($html_content)
	{
		if (strlen($html_content) > 0)
		{
			$htmlContentCopy = $html_content;
			$html_content = preg_replace_callback(
				'/\\s*(<script\\b[^>]*?>)([\\s\\S]*?)(<\\/script>)\\s*/i'
				,array('Tools', 'packJSinHTMLpregCallback')
				,$html_content);

			// If the string is too big preg_replace return null: http://php.net/manual/en/function.preg-replace-callback.php
			// In this case, we don't compress the content
			if ($html_content === null)
			{
				error_log('Error occured in function packJSinHTML');
				return $htmlContentCopy;
			}
			return $html_content;
		}
		return false;
	}

	public static function packJSinHTMLpregCallback($preg_matches)
	{
		$preg_matches[1] = $preg_matches[1].'/* <![CDATA[ */';
		$preg_matches[2] = self::packJS($preg_matches[2]);
		$preg_matches[count($preg_matches)-1] = '/* ]]> */'.$preg_matches[count($preg_matches)-1];
		unset($preg_matches[0]);
		return implode('', $preg_matches);
	}


	public static function packJS($js_content)
	{
		if (strlen($js_content) > 0)
		{
			require_once(_PS_TOOL_DIR_.'js_minify/jsmin.php');
			return JSMin::minify($js_content);
		}
		return false;
	}

	public static function minifyCSS($css_content, $fileuri = false)
	{
		global $current_css_file;

		$current_css_file = $fileuri;
		if (strlen($css_content) > 0)
		{
			$css_content = preg_replace('#/\*.*?\*/#s', '', $css_content);
			$css_content = preg_replace_callback('#url\((?:\'|")?([^\)\'"]*)(?:\'|")?\)#s', array('Tools', 'replaceByAbsoluteURL'), $css_content);

			$css_content = preg_replace('#\s+#',' ',$css_content);
			$css_content = str_replace("\t", '', $css_content);
			$css_content = str_replace("\n", '', $css_content);
			$css_content = str_replace('; ', ';', $css_content);
			$css_content = str_replace(': ', ':', $css_content);
			$css_content = str_replace(' {', '{', $css_content);
			$css_content = str_replace('{ ', '{', $css_content);
			$css_content = str_replace(', ', ',', $css_content);
			$css_content = str_replace('} ', '}', $css_content);
			$css_content = str_replace(' }', '}', $css_content);
			$css_content = str_replace(';}', '}', $css_content);
			$css_content = str_replace(':0px', ':0', $css_content);
			$css_content = str_replace(' 0px', ' 0', $css_content);
			$css_content = str_replace(':0em', ':0', $css_content);
			$css_content = str_replace(' 0em', ' 0', $css_content);
			$css_content = str_replace(':0pt', ':0', $css_content);
			$css_content = str_replace(' 0pt', ' 0', $css_content);
			$css_content = str_replace(':0%', ':0', $css_content);
			$css_content = str_replace(' 0%', ' 0', $css_content);

			return trim($css_content);
		}
		return false;
	}

	public static function replaceByAbsoluteURL($matches)
	{
		if (isset($matches[1]))
		{
			if ($matches[1][0] == '/')
				return 'url('.$matches[1].')';
			global $current_css_file;
			$tmp = dirname($current_css_file).'/'.$matches[1];
			return 'url(\''.self::getCurrentUrlProtocolPrefix().self::getMediaServer($tmp).$tmp.'\')';
		}
		return false;
	}

	/**
	 * addJS load a javascript file in the header
	 *
	 * @param mixed $js_uri
	 * @return void
	 */
	public static function addJS($js_uri)
	{
		global $js_files;

		if (!isset($js_files))
			$js_files = array();
		// avoid useless operation...
		if (in_array($js_uri, $js_files))
			return true;

		// detect mass add
		if (!is_array($js_uri) && !in_array($js_uri, $js_files))
			$js_uri = array($js_uri);
		else
			foreach ($js_uri as $key => $js)
				if (in_array($js, $js_files))
					unset($js_uri[$key]);

		//overriding of modules js files
		foreach ($js_uri as $key => &$file)
		{
			if (!preg_match('/^http(s?):\/\//i', $file))
			{
				$different = 0;
				$override_path = str_replace(__PS_BASE_URI__.'modules/', _PS_ROOT_DIR_.'/themes/'._THEME_NAME_.'/js/modules/', $file, $different);
				if ($different && file_exists($override_path))
					$file = str_replace(__PS_BASE_URI__.'modules/', __PS_BASE_URI__.'themes/'._THEME_NAME_.'/js/modules/', $file, $different);
				else
				{
					// remove PS_BASE_URI on _PS_ROOT_DIR_ for the following
					$url_data = parse_url($file);
					$file_uri = _PS_ROOT_DIR_.self::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
					// check if js files exists
					if (!file_exists($file_uri))
						unset($js_uri[$key]);
				}
			}
		}

		// adding file to the big array...
		$js_files = array_merge($js_files, $js_uri);

		return true;
	}

	/**
	 * addCSS allows you to add stylesheet at any time.
	 *
	 * @param mixed $css_uri
	 * @param string $css_media_type
	 * @return true
	 */
	public static function addCSS($css_uri, $css_media_type = 'all')
	{
		if (is_array($css_uri))
		{
			foreach ($css_uri as $file => $media_type)
				self::addCSS($file, $media_type);
			return true;
		}

		//overriding of modules css files
		$different = 0;
		$override_path = str_replace(__PS_BASE_URI__.'modules/', _PS_ROOT_DIR_.'/themes/'._THEME_NAME_.'/css/modules/', $css_uri, $different);
		if ($different && file_exists($override_path))
			$css_uri = str_replace(__PS_BASE_URI__.'modules/', __PS_BASE_URI__.'themes/'._THEME_NAME_.'/css/modules/', $css_uri, $different);
		else
		{
			// remove PS_BASE_URI on _PS_ROOT_DIR_ for the following
			$url_data = parse_url($css_uri);
			$file_uri = _PS_ROOT_DIR_.self::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
			// check if css files exists
			if (!file_exists($file_uri))
				return true;
		}

		// detect mass add
		$css_uri = array($css_uri => $css_media_type);

		global $css_files;

		// adding file to the big array...
		if (is_array($css_files))
			$css_files = array_merge($css_files, $css_uri);
		else
			$css_files = $css_uri;

		return true;
	}


	/**
	 * Combine Compress and Cache CSS (ccc) calls
	 *
	 */
	public static function cccCss()
	{
		global $css_files;

		//inits
		$css_files_by_media = array();
		$compressed_css_files = array();
		$compressed_css_files_not_found = array();
		$compressed_css_files_infos = array();
		$protocolLink = self::getCurrentUrlProtocolPrefix();

		// group css files by media
		foreach ($css_files as $filename => $media)
		{
			if (!array_key_exists($media, $css_files_by_media))
				$css_files_by_media[$media] = array();

			$infos = array();
			$infos['uri'] = $filename;
			$url_data = parse_url($filename);
			$infos['path'] = _PS_ROOT_DIR_.self::str_replace_once(__PS_BASE_URI__, '/', $url_data['path']);
			$css_files_by_media[$media]['files'][] = $infos;
			if (!array_key_exists('date', $css_files_by_media[$media]))
				$css_files_by_media[$media]['date'] = 0;
			$css_files_by_media[$media]['date'] = max(file_exists($infos['path']) ? filemtime($infos['path']) : 0, $css_files_by_media[$media]['date']);

			if (!array_key_exists($media, $compressed_css_files_infos))
				$compressed_css_files_infos[$media] = array('key' => '');
			$compressed_css_files_infos[$media]['key'] .= $filename;
		}

		// get compressed css file infos
		foreach ($compressed_css_files_infos as $media => &$info)
		{
			$key = md5($info['key'].$protocolLink);
			$filename = _PS_THEME_DIR_.'cache/'.$key.'_'.$media.'.css';
			$info = array(
				'key' => $key,
				'date' => file_exists($filename) ? filemtime($filename) : 0
			);
		}
		// aggregate and compress css files content, write new caches files
		foreach ($css_files_by_media as $media => $media_infos)
		{
			$cache_filename = _PS_THEME_DIR_.'cache/'.$compressed_css_files_infos[$media]['key'].'_'.$media.'.css';
			if ($media_infos['date'] > $compressed_css_files_infos[$media]['date'])
			{
				$compressed_css_files[$media] = '';
				foreach ($media_infos['files'] as $file_infos)
				{
					if (file_exists($file_infos['path']))
						$compressed_css_files[$media] .= self::minifyCSS(file_get_contents($file_infos['path']), $file_infos['uri']);
					else
						$compressed_css_files_not_found[] = $file_infos['path'];
				}
				if (!empty($compressed_css_files_not_found))
					$content = '/* WARNING ! file(s) not found : "'.
						implode(',', $compressed_css_files_not_found).
						'" */'."\n".$compressed_css_files[$media];
				else
					$content = $compressed_css_files[$media];
				file_put_contents($cache_filename, $content);
				chmod($cache_filename, 0777);
			}
			$compressed_css_files[$media] = $cache_filename;
		}

		// rebuild the original css_files array
		$css_files = array();
		foreach ($compressed_css_files as $media => $filename)
		{
			$url = str_replace(_PS_THEME_DIR_, _THEMES_DIR_._THEME_NAME_.'/', $filename);
			$css_files[$protocolLink.self::getMediaServer($url).$url] = $media;
		}
	}


	/**
	 * Combine Compress and Cache (ccc) JS calls
	 */
	public static function cccJS()
	{
		global $js_files;

		//inits
		$compressed_js_files_not_found = array();
		$js_files_infos = array();
		$js_files_date = 0;
		$compressed_js_file_date = 0;
		$compressed_js_filename = '';
		$js_external_files = array();
		$protocolLink = self::getCurrentUrlProtocolPrefix();

		// get js files infos
		foreach ($js_files as $filename)
		{
			$expr = explode(':', $filename);

			if ($expr[0] == 'http')
				$js_external_files[] = $filename;
			else
			{
				$infos = array();
				$infos['uri'] = $filename;
				$url_data = parse_url($filename);
				$infos['path'] =_PS_ROOT_DIR_.self::str_replace_once(__PS_BASE_URI__, '/', $url_data['path']);
				$js_files_infos[] = $infos;

				$js_files_date = max(file_exists($infos['path']) ? filemtime($infos['path']) : 0,	$js_files_date);
				$compressed_js_filename .= $filename;
			}
		}

		// get compressed js file infos
		$compressed_js_filename = md5($compressed_js_filename);

		$compressed_js_path = _PS_THEME_DIR_.'cache/'.$compressed_js_filename.'.js';
		$compressed_js_file_date = file_exists($compressed_js_path) ? filemtime($compressed_js_path) : 0;

		// aggregate and compress js files content, write new caches files
		if ($js_files_date > $compressed_js_file_date)
		{
			$content = '';
			foreach ($js_files_infos as $file_infos)
			{
				if (file_exists($file_infos['path']))
					$content .= file_get_contents($file_infos['path']).';';
				else
					$compressed_js_files_not_found[] = $file_infos['path'];
			}
			$content = self::packJS($content);

			if (!empty($compressed_js_files_not_found))
				$content = '/* WARNING ! file(s) not found : "'.
					implode(',', $compressed_js_files_not_found).
					'" */'."\n".$content;

			file_put_contents($compressed_js_path, $content);
			chmod($compressed_js_path, 0777);
		}

		// rebuild the original js_files array
		$url = str_replace(_PS_ROOT_DIR_.'/', __PS_BASE_URI__, $compressed_js_path);
		$js_files = array_merge(array($protocolLink.self::getMediaServer($url).$url), $js_external_files);

	}

	private static $_cache_nb_media_servers = null;
	public static function getMediaServer($filename)
	{
		if (self::$_cache_nb_media_servers === null)
		{
			if (_MEDIA_SERVER_1_ == '')
				self::$_cache_nb_media_servers = 0;
			elseif (_MEDIA_SERVER_2_ == '')
				self::$_cache_nb_media_servers = 1;
			elseif (_MEDIA_SERVER_3_ == '')
				self::$_cache_nb_media_servers = 2;
			else
				self::$_cache_nb_media_servers = 3;
		}

		if (self::$_cache_nb_media_servers && ($id_media_server = (abs(crc32($filename)) % self::$_cache_nb_media_servers + 1)))
			return constant('_MEDIA_SERVER_'.$id_media_server.'_');

		return _PS_SSL_ENABLED_ ? self::getShopDomainSsl(false) : self::getShopDomain(false);
	}

	public static function generateHtaccess($path, $rewrite_settings, $cache_control, $specific = '', $disableMultiviews = false)
	{
		$tab = array('ErrorDocument' => array(), 'RewriteEngine' => array(), 'RewriteRule' => array());
		$multilang = (Language::countActiveLanguages() > 1);

		// ErrorDocument
		$tab['ErrorDocument']['comment'] = '# Catch 404 errors';
		$tab['ErrorDocument']['content'] = '404 '.__PS_BASE_URI__.'404.php';

		// RewriteEngine
		$tab['RewriteEngine']['comment'] = '# URL rewriting module activation';

		// RewriteRules
		$tab['RewriteRule']['comment'] = '# URL rewriting rules';

		// Compatibility with the old image filesystem
		if (Configuration::get('PS_LEGACY_IMAGES'))
		{
			$tab['RewriteRule']['content']['^([a-z0-9]+)\-([a-z0-9]+)(\-[_a-zA-Z0-9-]*)/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1-$2$3.jpg [L]';
			$tab['RewriteRule']['content']['^([0-9]+)\-([0-9]+)/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1-$2.jpg [L]';
		}

		// Rewriting for product image id < 100 millions
		$tab['RewriteRule']['content']['^([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$1$2.jpg [L]';
		$tab['RewriteRule']['content']['^([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$2/$1$2$3.jpg [L]';
		$tab['RewriteRule']['content']['^([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$2/$3/$1$2$3$4.jpg [L]';
		$tab['RewriteRule']['content']['^([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$2/$3/$4/$1$2$3$4$5.jpg [L]';
		$tab['RewriteRule']['content']['^([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$2/$3/$4/$5/$1$2$3$4$5$6.jpg [L]';
		$tab['RewriteRule']['content']['^([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$2/$3/$4/$5/$6/$1$2$3$4$5$6$7.jpg [L]';
		$tab['RewriteRule']['content']['^([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$2/$3/$4/$5/$6/$7/$1$2$3$4$5$6$7$8.jpg [L]';
		$tab['RewriteRule']['content']['^([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/[_a-zA-Z0-9-]*\.jpg$'] = _PS_PROD_IMG_.'$1/$2/$3/$4/$5/$6/$7/$8/$1$2$3$4$5$6$7$8$9.jpg [L]';

		$tab['RewriteRule']['content']['^c/([0-9]+)(\-[_a-zA-Z0-9-]*)/[_a-zA-Z0-9-]*\.jpg$'] = 'img/c/$1$2.jpg [L]';
		$tab['RewriteRule']['content']['^c/([a-zA-Z-]+)/[a-zA-Z0-9-]+\.jpg$'] = 'img/c/$1.jpg [L]';
		$tab['RewriteRule']['content']['^c/([0-9]+)/[a-zA-Z0-9-]+\.jpg$'] = 'img/c/$1.jpg [L]';

		if ($multilang)
		{
			$tab['RewriteRule']['content']['^([a-z]{2})/[a-zA-Z0-9-]*/([0-9]+)\-[a-zA-Z0-9-]*\.html'] = 'product.php?id_product=$2&isolang=$1 [QSA,L]';
			$tab['RewriteRule']['content']['^([a-z]{2})/([0-9]+)\-[a-zA-Z0-9-]*\.html'] = 'product.php?id_product=$2&isolang=$1 [QSA,L]';
			$tab['RewriteRule']['content']['^([a-z]{2})/([0-9]+)\-[a-zA-Z0-9-]*(/[a-zA-Z0-9-]*)+'] = 'category.php?id_category=$2&isolang=$1&noredirect=1 [QSA,L]';
			$tab['RewriteRule']['content']['^([a-z]{2})/([0-9]+)\-[a-zA-Z0-9-]*'] = 'category.php?id_category=$2&isolang=$1 [QSA,L]';
			$tab['RewriteRule']['content']['^([a-z]{2})/content/([0-9]+)\-[a-zA-Z0-9-]*'] = 'cms.php?isolang=$1&id_cms=$2 [QSA,L]';
			$tab['RewriteRule']['content']['^([a-z]{2})/content/category/([0-9]+)\-[a-zA-Z0-9-]*'] = 'cms.php?isolang=$1&id_cms_category=$2 [QSA,L]';
			$tab['RewriteRule']['content']['^([a-z]{2})/([0-9]+)__[a-zA-Z0-9-]*'] = 'supplier.php?isolang=$1&id_supplier=$2 [QSA,L]';
			$tab['RewriteRule']['content']['^([a-z]{2})/([0-9]+)_[a-zA-Z0-9-]*'] = 'manufacturer.php?isolang=$1&id_manufacturer=$2 [QSA,L]';
		}

		// PS BASE URI automaticaly prepend the string, do not use PS defines for the image directories
		$tab['RewriteRule']['content']['^([0-9]+)(\-[_a-zA-Z0-9-]*)/[_a-zA-Z0-9-]*\.jpg$'] = 'img/c/$1$2.jpg [L]';

		$tab['RewriteRule']['content']['^([0-9]+)\-[a-zA-Z0-9-]*\.html'] = 'product.php?id_product=$1 [QSA,L]';
		$tab['RewriteRule']['content']['^[a-zA-Z0-9-]*/([0-9]+)\-[a-zA-Z0-9-]*\.html'] = 'product.php?id_product=$1 [QSA,L]';
		// Notice : the id_category rule has to be after product rules.
		// If not, category with number in their name will result a bug
		$tab['RewriteRule']['content']['^([0-9]+)\-[a-zA-Z0-9-]*(/[a-zA-Z0-9-]*)+'] = 'category.php?id_category=$1&noredirect=1 [QSA,L]';
		$tab['RewriteRule']['content']['^([0-9]+)\-[a-zA-Z0-9-]*'] = 'category.php?id_category=$1 [QSA,L]';
		$tab['RewriteRule']['content']['^([0-9]+)__([a-zA-Z0-9-]*)'] = 'supplier.php?id_supplier=$1 [QSA,L]';
		$tab['RewriteRule']['content']['^([0-9]+)_([a-zA-Z0-9-]*)'] = 'manufacturer.php?id_manufacturer=$1 [QSA,L]';
		$tab['RewriteRule']['content']['^content/([0-9]+)\-([a-zA-Z0-9-]*)'] = 'cms.php?id_cms=$1 [QSA,L]';
		$tab['RewriteRule']['content']['^content/category/([0-9]+)\-([a-zA-Z0-9-]*)'] = 'cms.php?id_cms_category=$1 [QSA,L]';

		// Compatibility with the old URLs
		if (!Configuration::get('PS_INSTALL_VERSION') OR version_compare(Configuration::get('PS_INSTALL_VERSION'), '1.4.0.7') == -1)
		{
			// This is a nasty copy/paste of the previous links, but with "lang-en" instead of "en"
			// Do not update it when you add something in the one at the top, it's only for the old links
			$tab['RewriteRule']['content']['^lang-([a-z]{2})/([a-zA-Z0-9-]*)/([0-9]+)\-([a-zA-Z0-9-]*)\.html'] = 'product.php?id_product=$3&isolang=$1 [QSA,L]';
			$tab['RewriteRule']['content']['^lang-([a-z]{2})/([0-9]+)\-([a-zA-Z0-9-]*)\.html'] = 'product.php?id_product=$2&isolang=$1 [QSA,L]';
			$tab['RewriteRule']['content']['^lang-([a-z]{2})/([0-9]+)\-([a-zA-Z0-9-]*)'] = 'category.php?id_category=$2&isolang=$1 [QSA,L]';
			$tab['RewriteRule']['content']['^content/([0-9]+)\-([a-zA-Z0-9-]*)'] = 'cms.php?id_cms=$1 [QSA,L]';
			$tab['RewriteRule']['content']['^content/category/([0-9]+)\-([a-zA-Z0-9-]*)'] = 'cms.php?id_cms_category=$1 [QSA,L]';
		}

		Language::loadLanguages();
		$default_meta = Meta::getMetasByIdLang((int)_PS_LANG_DEFAULT_);

		if ($multilang)
			foreach (Language::getLanguages() as $language)
			{
				foreach (Meta::getMetasByIdLang($language['id_lang']) as $key => $meta)
					if (!empty($meta['url_rewrite']) AND Validate::isLinkRewrite($meta['url_rewrite']))
						$tab['RewriteRule']['content']['^'.$language['iso_code'].'/'.$meta['url_rewrite'].'$'] = $meta['page'].'.php?isolang='.$language['iso_code'].' [QSA,L]';
				elseif (array_key_exists($key, $default_meta) && $default_meta[$key]['url_rewrite'] != '')
					$tab['RewriteRule']['content']['^'.$language['iso_code'].'/'.$default_meta[$key]['url_rewrite'].'$'] = $default_meta[$key]['page'].'.php?isolang='.$language['iso_code'].' [QSA,L]';
				$tab['RewriteRule']['content']['^'.$language['iso_code'].'$'] = $language['iso_code'].'/ [QSA,L]';
				$tab['RewriteRule']['content']['^'.$language['iso_code'].'/([^?&]*)$'] = '$1?isolang='.$language['iso_code'].' [QSA,L]';
			}
		else
			foreach ($default_meta as $key => $meta)
				if (!empty($meta['url_rewrite']))
					$tab['RewriteRule']['content']['^'.$meta['url_rewrite'].'$'] = $meta['page'].'.php [QSA,L]';
		elseif (array_key_exists($key, $default_meta) && $default_meta[$key]['url_rewrite'] != '')
			$tab['RewriteRule']['content']['^'.$default_meta[$key]['url_rewrite'].'$'] = $default_meta[$key]['page'].'.php [QSA,L]';

		if (!$writeFd = @fopen($path, 'w'))
			return false;

		// PS Comments
		fwrite($writeFd, "# .htaccess automaticaly generated by PrestaShop e-commerce open-source solution\n");
		fwrite($writeFd, "# WARNING: PLEASE DO NOT MODIFY THIS FILE MANUALLY. IF NECESSARY, ADD YOUR SPECIFIC CONFIGURATION WITH THE HTACCESS GENERATOR IN BACK OFFICE\n");
		fwrite($writeFd, "# http://www.prestashop.com - http://www.prestashop.com/forums\n\n");
		if (!empty($specific))
			fwrite($writeFd, $specific);

		// RewriteEngine
		fwrite($writeFd, "\n<IfModule mod_rewrite.c>\n");

		if ($disableMultiviews)
			fwrite($writeFd, "\n# Disable Multiviews\nOptions -Multiviews\n\n");

		fwrite($writeFd, $tab['RewriteEngine']['comment']."\nRewriteEngine on\n\n");
		fwrite($writeFd, $tab['RewriteRule']['comment']."\n");
		// Webservice
		if (Configuration::get('PS_WEBSERVICE'))
		{
			fwrite($writeFd, 'RewriteRule ^api/?(.*)$ '.__PS_BASE_URI__."webservice/dispatcher.php?url=$1 [QSA,L]\n");
			if (Configuration::get('PS_WEBSERVICE_CGI_HOST'))
				fwrite($writeFd, 'RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]'."\n");
		}

		// Classic URL rewriting
		if ($rewrite_settings)
			foreach ($tab['RewriteRule']['content'] as $rule => $url)
				fwrite($writeFd, 'RewriteRule '.$rule.' '.__PS_BASE_URI__.$url."\n");

		fwrite($writeFd, "</IfModule>\n\n");

		// ErrorDocument
		fwrite($writeFd, $tab['ErrorDocument']['comment']."\nErrorDocument ".$tab['ErrorDocument']['content']."\n");

		// Cache control
		if ($cache_control)
		{
			fwrite($writeFd, '
<IfModule mod_expires.c>
	ExpiresActive On
	ExpiresByType image/gif "access plus 1 month"
	ExpiresByType image/jpeg "access plus 1 month"
	ExpiresByType image/png "access plus 1 month"
	ExpiresByType text/css "access plus 1 week"
	ExpiresByType text/javascript "access plus 1 week"
	ExpiresByType application/javascript "access plus 1 week"
	ExpiresByType application/x-javascript "access plus 1 week"
	ExpiresByType image/x-icon "access plus 1 year"
</IfModule>

FileETag INode MTime Size
<IfModule mod_deflate.c>
	<IfModule mod_filter.c>
		AddOutputFilterByType DEFLATE text/html text/css text/plain text/javascript application/javascript application/x-javascript
	</IfModule>
</IfModule>'."\n");
		}
		fclose($writeFd);

		Module::hookExec('afterCreateHtaccess');

		return true;
	}

	/**
	 * jsonDecode convert json string to php array / object
	 *
	 * @param string $json
	 * @param boolean $assoc  (since 1.4.2.4) if true, convert to associativ array
	 * @return array
	 */
	public static function jsonDecode($json, $assoc = false)
	{
		if (function_exists('json_decode'))
			return json_decode($json, $assoc);
		else
		{
			include_once(_PS_TOOL_DIR_.'json/json.php');
			$pearJson = new Services_JSON(($assoc) ? SERVICES_JSON_LOOSE_TYPE : 0);
			return $pearJson->decode($json);
		}
	}

	/**
	 * Convert an array to json string
	 *
	 * @param array $data
	 * @return string json
	 */
	public static function jsonEncode($data)
	{
		if (function_exists('json_encode'))
			return json_encode($data);
		else
		{
			include_once(_PS_TOOL_DIR_.'json/json.php');
			$pearJson = new Services_JSON();
			return $pearJson->encode($data);
		}
	}

	/**
	 * Display a warning message indicating that the method is deprecated
	 */
	public static function displayAsDeprecated()
	{
		if (_PS_DISPLAY_COMPATIBILITY_WARNING_)
		{
			$backtrace = debug_backtrace();
			$callee = next($backtrace);
			trigger_error('Function <strong>'.$callee['function'].'()</strong> is deprecated in <strong>'.$callee['file'].'</strong> on line <strong>'.$callee['line'].'</strong><br />', E_USER_WARNING);

			$message = self::displayError('The function').' '.$callee['function'].' ('.self::displayError('Line').' '.$callee['line'].') '.self::displayError('is deprecated and will be removed in the next major version.');

			Logger::addLog($message, 3, $callee['class']);
		}
	}

	/**
	 * Display a warning message indicating that the parameter is deprecated
	 */
	public static function displayParameterAsDeprecated($parameter)
	{
		if (_PS_DISPLAY_COMPATIBILITY_WARNING_)
		{
			$backtrace = debug_backtrace();
			$callee = next($backtrace);
			trigger_error('Parameter <strong>'.$parameter.'</strong> in function <strong>'.$callee['function'].'()</strong> is deprecated in <strong>'.$callee['file'].'</strong> on line <strong>'.$callee['Line'].'</strong><br />', E_USER_WARNING);

			$message = self::displayError('The parameter').' '.$parameter.' '.self::displayError(' in function ').' '.$callee['function'].' ('.self::displayError('Line').' '.$callee['Line'].') '.self::displayError('is deprecated and will be removed in the next major version.');
			Logger::addLog($message, 3, $callee['class']);
		}
	}

	public static function enableCache($level = 1)
	{
		global $smarty;

		if (!Configuration::get('PS_SMARTY_CACHE') || ($smarty->force_compile == 0 && $smarty->caching == $level))
			return;

		/* Backup current values */
		self::$_forceCompile = (int)$smarty->force_compile;
		self::$_caching = (int)$smarty->caching;

		/* Forcing Smarty to use the cache */
		$smarty->force_compile = 0;
		$smarty->caching = (int)$level;
	}

	public static function restoreCacheSettings()
	{
		global $smarty;

		if (isset(self::$_forceCompile))
			$smarty->force_compile = (int)self::$_forceCompile;
		if (isset(self::$_caching))
			$smarty->caching = (int)self::$_caching;
	}

	public static function isCallable($function)
	{
		$disabled = explode(',', ini_get('disable_functions'));
		return (!in_array($function, $disabled) && is_callable($function));
	}

	public static function pRegexp($s, $delim)
	{
		$s = str_replace($delim, '\\'.$delim, $s);
		foreach (array('?', '[', ']', '(', ')', '{', '}', '-', '.', '+', '*', '^', '$', '`', '"', '%') as $char)
			$s = str_replace($char, '\\'.$char, $s);
		return $s;
	}

	public static function str_replace_once($needle , $replace, $haystack)
	{
		$pos = strpos($haystack, $needle);
		if ($pos === false)
			return $haystack;
		return substr_replace($haystack, $replace, $pos, strlen($needle));
	}

	/**
	 * Function property_exists does not exist in PHP < 5.1
	 *
	 * @param object or class $class
	 * @param string $property
	 * @return boolean
	 */
	public static function property_exists($class, $property)
	{
		if (function_exists('property_exists'))
			return property_exists($class, $property);

		if (is_object($class))
			$vars = get_object_vars($class);
		else
			$vars = get_class_vars($class);

		return array_key_exists($property, $vars);
	}

	/**
	 * @desc identify the version of php
	 * @return string
	 */
	public static function checkPhpVersion()
	{
		$version = null;

		if (defined('PHP_VERSION'))
			$version = PHP_VERSION;
		else
			$version  = phpversion('');

		//Case management system of ubuntu, php version return 5.2.4-2ubuntu5.2
		if (strpos($version, '-') !== false )
			$version  = substr($version, 0, strpos($version, '-'));

		return $version;
	}

	/**
	 * @desc selection of Smarty depending on the version of php
	 *
	 */
	public static function selectionVersionSmarty()
	{
		//Smarty 3 requirements PHP 5.2 +
		if (strnatcmp(self::checkPhpVersion(),'5.2.0') >= 0)
			Configuration::updateValue('PS_FORCE_SMARTY_2', 0);
		else
			Configuration::updateValue('PS_FORCE_SMARTY_2', 1);
	}

	/**
	 * @desc try to open a zip file in order to check if it's valid
	 * @return bool success
	 */
	public static function ZipTest($from_file)
	{
		if (class_exists('ZipArchive', false))
		{
			$zip = new ZipArchive();
			return $zip->open($from_file, ZIPARCHIVE::CHECKCONS) === true;
		}
		require_once(dirname(__FILE__).'/../tools/pclzip/pclzip.lib.php');
		$zip = new PclZip($from_file);

		return $zip->privCheckFormat() === true;
	}

	/**
	 * @desc extract a zip file to the given directory
	 * @return bool success
	 */
	public static function ZipExtract($fromFile, $toDir)
	{
		if (!file_exists($toDir))
			mkdir($toDir, 0777);
		if (class_exists('ZipArchive', false))
		{
			$zip = new ZipArchive();
			if ($zip->open($fromFile) === true AND $zip->extractTo($toDir) AND $zip->close())
				return true;
			return false;
		}
		else
		{
			require_once(dirname(__FILE__).'/../tools/pclzip/pclzip.lib.php');
			$zip = new PclZip($fromFile);
			$list = $zip->extract(PCLZIP_OPT_PATH, $toDir);
			foreach ($list as $extractedFile)
				if ($extractedFile['status'] != 'ok')
					return false;
			return true;
		}
	}

	/**
	 * Get products order field name for queries.
	 *
	 * @param string $type by|way
	 * @param string $value If no index given, use default order from admin -> pref -> products
	 */
	public static function getProductsOrder($type, $value = null, $prefix = false)
	{
		switch ($type)
		{
			case 'by' :
				$list = array(0 => 'name', 1 => 'price', 2 => 'date_add', 3 => 'date_upd', 4 => 'position', 5 => 'manufacturer_name', 6 => 'quantity');
				$value = (is_null($value) || $value === false || $value === '') ? (int)Configuration::get('PS_PRODUCTS_ORDER_BY') : $value;
				$value = (isset($list[$value])) ? $list[$value] : ((in_array($value, $list)) ? $value : 'position');
				$orderByPrefix = '';
				if ($prefix)
				{
					if ($value == 'id_product' || $value == 'date_add' || $value == 'date_upd' || $value == 'price')
						$orderByPrefix = 'p.';
					elseif ($value == 'name')
						$orderByPrefix = 'pl.';
					elseif ($value == 'manufacturer_name' && $prefix)
					{
						$orderByPrefix = 'm.';
						$value = 'name';
					}
					elseif ($value == 'position' || empty($value))
						$orderByPrefix = 'cp.';
				}

				return $orderByPrefix.$value;
				break;

			case 'way' :
				$value = (is_null($value) || $value === false || $value === '') ? (int)Configuration::get('PS_PRODUCTS_ORDER_WAY') : $value;
				$list = array(0 => 'asc', 1 => 'desc');
				return ((isset($list[$value])) ? $list[$value] : ((in_array($value, $list)) ? $value : 'asc'));
				break;
		}
	}

	/**
	 * Convert a shorthand byte value from a PHP configuration directive to an integer value
	 * @param string $value value to convert
	 * @return int
	 */
	public static function convertBytes($value)
	{
		if (is_numeric($value))
			return $value;
		else
		{
			$value_length = strlen($value);
			$qty = substr($value, 0, $value_length - 1 );
			$unit = strtolower(substr($value, $value_length - 1));
			switch ($unit)
			{
				case 'k':
					$qty *= 1024;
					break;
				case 'm':
					$qty *= 1048576;
					break;
				case 'g':
					$qty *= 1073741824;
					break;
			}
			return $qty;
		}
	}

	public static function display404Error()
	{
		header('HTTP/1.1 404 Not Found');
		header('Status: 404 Not Found');
		include(dirname(__FILE__).'/../404.php');
		die;
	}

	/**
	 * Display error and dies or silently log the error.
	 *
	 * @param string $msg
	 * @param bool $die
	 * @return success of logging
	 */
	public static function dieOrLog($msg, $die = true)
	{
		if ($die || (defined('_PS_MODE_DEV_') && _PS_MODE_DEV_))
			die($msg);
		return Logger::addLog($msg);
	}

	/**
	 * Clear cache for Smarty
	 *
	 * @param objet $smarty
	 */
	public static function clearCache($smarty)
	{
		if (!_PS_FORCE_SMARTY_2_)
			$smarty->clearAllCache();
		else
			$smarty->clear_all_cache();
	}

	/**
	 * getMemoryLimit allow to get the memory limit in octet
	 *
	 * @since 1.4.5.0
	 * @return int the memory limit value in octet
	 */
	public static function getMemoryLimit()
	{
		$memory_limit = @ini_get('memory_limit');

		if (preg_match('/[0-9]+k/i', $memory_limit))
			return 1024 * (int)$memory_limit;

		if (preg_match('/[0-9]+m/i', $memory_limit))
			return 1024 * 1024 * (int)$memory_limit;

		if (preg_match('/[0-9]+g/i', $memory_limit))
			return 1024 * 1024 * 1024 * (int)$memory_limit;

		return $memory_limit;
	}

	public static function isX86_64arch()
	{
		return PHP_INT_MAX == '9223372036854775807';
	}

	/**
	 * apacheModExists return true if the apache module $name is loaded
	 * @TODO move this method in class Information (when it will exist)
	 *
	 * @param string $name module name
	 * @return boolean true if exists
	 * @since 1.4.5.0
	 */
	public static function apacheModExists($name)
	{
		if (function_exists('apache_get_modules'))
		{
			static $apacheModuleList = null;

			if (!is_array($apacheModuleList))
				$apacheModuleList = apache_get_modules();

			// we need strpos (example, evasive can be evasive20)
			foreach($apacheModuleList as $module)
				if (strpos($module, $name) !== false)
					return true;
		}
		else
		{
			// If apache_get_modules does not exists,
			// one solution should be parsing httpd.conf,
			// but we could simple parse phpinfo(INFO_MODULES) return string
			ob_start();
			phpinfo(INFO_MODULES);
			$phpinfo = ob_get_contents();
			ob_end_clean();
			if (strpos($phpinfo, $name) !== false)
				return true;
		}

		return false;
	}
}

/**
* Compare 2 prices to sort products
*
* @param float $a
* @param float $b
* @return integer
*/
/* Externalized because of a bug in PHP 5.1.6 when inside an object */
function cmpPriceAsc($a,$b)
{
	if ((float)($a['price_tmp']) < (float)($b['price_tmp']))
		return (-1);
	elseif ((float)($a['price_tmp']) > (float)($b['price_tmp']))
		return (1);
	return (0);
}

function cmpPriceDesc($a,$b)
{
	if ((float)($a['price_tmp']) < (float)($b['price_tmp']))
		return (1);
	elseif ((float)($a['price_tmp']) > (float)($b['price_tmp']))
		return (-1);
	return (0);
}
