<?php
/*
* 2007-2014 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  2007-2014 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class MediaCore
{
	public static $jquery_ui_dependencies = array(
		'ui.core' => array('fileName' => 'jquery.ui.core.min.js', 'dependencies' => array(), 'theme' => true),
		'ui.widget' => array('fileName' => 'jquery.ui.widget.min.js', 'dependencies' => array(), 'theme' => false),
		'ui.mouse' => array('fileName' => 'jquery.ui.mouse.min.js', 'dependencies' => array('ui.core', 'ui.widget'), 'theme' => false),
		'ui.position' => array('fileName' => 'jquery.ui.position.min.js', 'dependencies' => array(), 'theme' => false),
		'ui.draggable' => array('fileName' => 'jquery.ui.draggable.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.mouse'), 'theme' => false),
		'ui.droppable' => array('fileName' => 'jquery.ui.droppable.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.mouse', 'ui.draggable'), 'theme' => false),
		'ui.resizable' => array('fileName' => 'jquery.ui.resizable.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.mouse'), 'theme' => true),
		'ui.selectable' => array('fileName' => 'jquery.ui.selectable.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.mouse'), 'theme' => true),
		'ui.sortable' => array('fileName' => 'jquery.ui.sortable.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.mouse'), 'theme' => true),
		'ui.autocomplete' => array('fileName' => 'jquery.ui.autocomplete.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.position', 'ui.menu'), 'theme' => true),
		'ui.button' => array('fileName' => 'jquery.ui.button.min.js', 'dependencies' => array('ui.core', 'ui.widget'), 'theme' => true),
		'ui.dialog' => array('fileName' => 'jquery.ui.dialog.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.position','ui.button'), 'theme' => true),
		'ui.menu' => array('fileName' => 'jquery.ui.menu.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.position'), 'theme' => true),
		'ui.slider' => array('fileName' => 'jquery.ui.slider.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.mouse'), 'theme' => true),
		'ui.spinner' => array('fileName' => 'jquery.ui.spinner.min.js', 'dependencies' => array('ui.core', 'ui.widget', 'ui.button'), 'theme' => true),
		'ui.tabs' => array('fileName' => 'jquery.ui.tabs.min.js', 'dependencies' => array('ui.core', 'ui.widget'), 'theme' => true),
		'ui.datepicker' => array('fileName' => 'jquery.ui.datepicker.min.js', 'dependencies' => array('ui.core'), 'theme' => true),
		'ui.progressbar' => array('fileName' => 'jquery.ui.progressbar.min.js', 'dependencies' => array('ui.core', 'ui.widget'), 'theme' => true),
		'ui.tooltip' => array('fileName' => 'jquery.ui.tooltip.min.js', 'dependencies' => array('ui.core', 'ui.widget','ui.position','effects.core'), 'theme' => true),
		'ui.accordion' => array('fileName' => 'jquery.ui.accordion.min.js', 'dependencies' => array('ui.core', 'ui.widget','effects.core'), 'theme' => true),
		'effects.core' => array('fileName' => 'jquery.effects.core.min.js', 'dependencies' => array(), 'theme' => false),
		'effects.blind' => array('fileName' => 'jquery.effects.blind.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.bounce' => array('fileName' => 'jquery.effects.bounce.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.clip' => array('fileName' => 'jquery.effects.clip.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.drop' => array('fileName' => 'jquery.effects.drop.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.explode' => array('fileName' => 'jquery.effects.explode.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.fade' => array('fileName' => 'jquery.effects.fade.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.fold' => array('fileName' => 'jquery.effects.fold.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.highlight' => array('fileName' => 'jquery.effects.highlight.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.pulsate' => array('fileName' => 'jquery.effects.pulsate.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.scale' => array('fileName' => 'jquery.effects.scale.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.shake' => array('fileName' => 'jquery.effects.shake.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.slide' => array('fileName' => 'jquery.effects.slide.min.js', 'dependencies' => array('effects.core'), 'theme' => false),
		'effects.transfer' => array('fileName' => 'jquery.effects.transfer.min.js', 'dependencies' => array('effects.core'), 'theme' => false)
	);

	/**
	 * @var array list of javascript definitions
	 */
	protected static $js_def = array();

	/**
	 * @var array list of javascript inline scripts
	 */
	protected static $inline_script = array();

	/**
	 * @var array list of javascript external scripts
	 */
	protected static $inline_script_src = array();

	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('Media', 'minifyHTMLpregCallback'),
				// $html_content,
				// Media::getBackTrackLimit());

			require_once(_PS_TOOL_DIR_.'minify_html/minify_html.class.php');
			$html_content = str_replace(chr(194).chr(160), '&nbsp;', $html_content);
			if (trim($minified_content = Minify_HTML::minify($html_content, array('cssMinifier', 'jsMinifier'))) !=  '')
				$html_content = $minified_content;

			return $html_content;
		}
		return false;
	}

	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>)
		if (empty($args))
			$output = $preg_matches[1].'>';
		else
			$output = $preg_matches[1].' '.implode(' ', $args).'>';
		return $output;
	}

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

			// If the string is too big preg_replace return an error
			// In this case, we don't compress the content
			if (function_exists('preg_last_error') && preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR)
			{
				if (_PS_MODE_DEV_)
					error_log('ERROR: PREG_BACKTRACK_LIMIT_ERROR in function packJSinHTML');
				return $html_content_copy;
			}
			return $html_content;
		}
		return false;
	}

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

	public static function packJS($js_content)
	{
		if (!empty($js_content))
		{
			require_once(_PS_TOOL_DIR_.'js_minify/jsmin.php');
			try {
				$js_content = JSMin::minify($js_content);
			} catch (Exception $e) {
				if (_PS_MODE_DEV_)
					echo $e->getMessage();
				return ';'.trim($js_content, ';').';';
			}
		}
		return ';'.trim($js_content, ';').';';
	}

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

		$current_css_file = $fileuri;
		if (strlen($css_content) > 0)
		{
			$limit  = Media::getBackTrackLimit();
			$css_content = preg_replace('#/\*.*?\*/#s', '', $css_content, $limit);
			$css_content = preg_replace_callback('#(url\((?![\\\'"]?data:)(?!http://)(?!https://)(?:\'|")?)([^\)\'"]*(?:\'|")?\))#s', array('Tools', 'replaceByAbsoluteURL'), $css_content, $limit); 
			$css_content = preg_replace('#\s+#', ' ', $css_content, $limit);		
			$css_content = str_replace(array("\t", "\n", "\r"), '', $css_content);
			$css_content = str_replace(array('; ', ': '), array(';', ':'), $css_content);
			$css_content = str_replace(array(' {', '{ '), '{', $css_content);
			$css_content = str_replace(', ', ',', $css_content);
			$css_content = str_replace(array('} ', ' }', ';}'), '}', $css_content);
			$css_content = str_replace(array(':0px', ':0em', ':0pt', ':0%'), ':0', $css_content);
			$css_content = str_replace(array(' 0px', ' 0em', ' 0pt', ' 0%'), ' 0', $css_content);
			$css_content = str_replace('\'images_ie/', '\'images/', $css_content);
			$css_content = preg_replace_callback('#(AlphaImageLoader\(src=\')([^\']*\',)#s', array('Tools', 'replaceByAbsoluteURL'), $css_content);	
			// Store all import url
			preg_match_all('#@(import|charset) .*?;#i', $css_content, $m);
			for ($i = 0, $total = count($m[0]); $i < $total; $i++)
			{
				if (isset($m[1][$i]) && $m[1][$i] == 'import')
					$import_url[] = $m[0][$i];
				$css_content = str_replace($m[0][$i], '', $css_content);
			}

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

	/**
	 * addJS return javascript path
	 *
	 * @param mixed $js_uri
	 * @return string
	 */
	public static function getJSPath($js_uri)
	{
		return Media::getMediaPath($js_uri);
	}

	/**
	 * addCSS return stylesheet path.
	 *
	 * @param mixed $css_uri
	 * @param string $css_media_type
	 * @param bool $need_rtl
	 * @return string
	 */
	public static function getCSSPath($css_uri, $css_media_type = 'all', $need_rtl = true)
	{
		// RTL Ready: search and load rtl css file if it's not originally rtl
		if($need_rtl && Context::getContext()->language->is_rtl)
		{
			$css_uri_rtl = preg_replace('/(^[^.].*)(\.css)$/', '$1_rtl.css', $css_uri);
			$rtl_media = Media::getMediaPath($css_uri_rtl, $css_media_type);
			if($rtl_media != false)
				return $rtl_media;
		}
		// End RTL
		return Media::getMediaPath($css_uri, $css_media_type);
	}

	public static function getMediaPath($media_uri, $css_media_type = null)
	{
		if (is_array($media_uri) || $media_uri === null || empty($media_uri))
			return false;

		$url_data = parse_url($media_uri);
		if (!is_array($url_data))
			return false;

		$file_uri = '';
		if (!array_key_exists('host', $url_data))
		{
			$media_uri_host_mode = '/'.ltrim(str_replace(str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, _PS_CORE_DIR_), __PS_BASE_URI__, $media_uri), '/\\');
			$media_uri = '/'.ltrim(str_replace(str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, _PS_ROOT_DIR_), __PS_BASE_URI__, $media_uri), '/\\');
			$url_data['path'] = $media_uri;			
			// remove PS_BASE_URI on _PS_ROOT_DIR_ for the following
			$file_uri = _PS_ROOT_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
			$file_uri_host_mode = _PS_CORE_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, Tools::str_replace_once(_PS_CORE_DIR_, '', $url_data['path']));
		}

		// check if css files exists
		if (!array_key_exists('host', $url_data))
		{			
			if (!@filemtime($file_uri) || @filesize($file_uri) === 0)
			{
				if (!defined('_PS_HOST_MODE_'))
					return false;
				elseif(!@filemtime($file_uri_host_mode) || @filesize($file_uri_host_mode) === 0)
					return false;
				else
				{
					$media_uri = $media_uri_host_mode;
					$file_uri = $file_uri_host_mode;
				}				
			}
		}

		if (!array_key_exists('host', $url_data))
			$media_uri = str_replace('//', '/', $media_uri);
		
		if ($css_media_type)
			return array($media_uri => $css_media_type);

		return $media_uri;
	}

	/**
	 * return jquery path.
	 *
	 * @param mixed $version
	 * @return string
	 */
	public static function getJqueryPath($version = null, $folder = null, $minifier = true)
	{
		$add_no_conflict = false;
		if ($version === null)
			$version = _PS_JQUERY_VERSION_; //set default version
		else if (preg_match('/^([0-9\.]+)$/Ui', $version))
			$add_no_conflict = true;
		else
			return false;

		if ($folder === null)
			$folder = _PS_JS_DIR_.'jquery/'; //set default folder
		//check if file exist
		$file = $folder.'jquery-'.$version.($minifier ? '.min.js' : '.js');

		// remove PS_BASE_URI on _PS_ROOT_DIR_ for the following
		$url_data = parse_url($file);
		$file_uri = _PS_ROOT_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		$file_uri_host_mode = _PS_CORE_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		// check if js files exists, if not try to load query from ajax.googleapis.com

		$return = array();
		if (@filemtime($file_uri) || (defined('_PS_HOST_MODE_') && @filemtime($file_uri_host_mode)))
			$return[] = Media::getJSPath($file);
		else
			$return[] = Media::getJSPath(Tools::getCurrentUrlProtocolPrefix().'ajax.googleapis.com/ajax/libs/jquery/'.$version.'/jquery'.($minifier ? '.min.js' : '.js'));

		if ($add_no_conflict)
			$return[] = Media::getJSPath(Context::getContext()->link->getMediaLink(_PS_JS_DIR_.'jquery/jquery.noConflict.php?version='.$version));

		//added query migrate for compatibility with new version of jquery will be removed in ps 1.6
		$return[] = Media::getJSPath(_PS_JS_DIR_.'jquery/jquery-migrate-1.2.1.min.js');

		return $return;
	}

	/**
	 * return jqueryUI component path.
	 *
	 * @param mixed $component
	 * @return string
	 */
	public static function getJqueryUIPath($component, $theme, $check_dependencies)
	{
		$ui_path = array('js' => array(), 'css' => array());
		$folder = _PS_JS_DIR_.'jquery/ui/';
		$file = 'jquery.'.$component.'.min.js';
		$url_data = parse_url($folder.$file);
		$file_uri = _PS_ROOT_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		$file_uri_host_mode = _PS_CORE_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		$ui_tmp = array();
		if (isset(Media::$jquery_ui_dependencies[$component]) && Media::$jquery_ui_dependencies[$component]['theme'] && $check_dependencies)
		{
			$theme_css = Media::getCSSPath($folder.'themes/'.$theme.'/jquery.ui.theme.css');
			$comp_css = Media::getCSSPath($folder.'themes/'.$theme.'/jquery.'.$component.'.css');
			if (!empty($theme_css) || $theme_css)
				$ui_path['css'] = array_merge($ui_path['css'], $theme_css);
			if (!empty($comp_css) || $comp_css)
				$ui_path['css'] = array_merge($ui_path['css'], $comp_css);
		}
		if ($check_dependencies && array_key_exists($component, self::$jquery_ui_dependencies))
		{
			foreach (self::$jquery_ui_dependencies[$component]['dependencies'] as $dependency)
			{
				$ui_tmp[] = Media::getJqueryUIPath($dependency, $theme, false);
				if (self::$jquery_ui_dependencies[$dependency]['theme'])
					$dep_css = Media::getCSSPath($folder.'themes/'.$theme.'/jquery.'.$dependency.'.css');


				if (isset($dep_css) && (!empty($dep_css) || $dep_css))
					$ui_path['css'] = array_merge($ui_path['css'], $dep_css);
			}
		}
		if (@filemtime($file_uri) || (defined('_PS_HOST_MODE_') && @filemtime($file_uri_host_mode)))
		{
			if (!empty($ui_tmp))
			{
				foreach ($ui_tmp as $ui)
				{
					if (!empty($ui['js']))
						$ui_path['js'][] = $ui['js'];

					if (!empty($ui['css']))
						$ui_path['css'][] = $ui['css'];
				}
				$ui_path['js'][] = Media::getJSPath($folder.$file);
			}
			else
				$ui_path['js'] = Media::getJSPath($folder.$file);
		}

		//add i18n file for datepicker
		if ($component == 'ui.datepicker')
		{
			if (!is_array($ui_path['js']))
				$ui_path['js'] = array($ui_path['js']);

			$ui_path['js'][] = Media::getJSPath($folder.'i18n/jquery.ui.datepicker-'.Context::getContext()->language->iso_code.'.js');
		}

		return $ui_path;
	}

	/**
	 * return jquery plugin path.
	 *
	 * @param mixed $name
	 * @return string|boolean
	 */
	public static function getJqueryPluginPath($name, $folder = null)
	{
		$plugin_path = array('js' => array(), 'css' => array());
		if ($folder === null)
			$folder = _PS_JS_DIR_.'jquery/plugins/'; //set default folder

		$file = 'jquery.'.$name.'.js';
		$url_data = parse_url($folder);
		$file_uri = _PS_ROOT_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		$file_uri_host_mode = _PS_CORE_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		
		if (@file_exists($file_uri.$file) || (defined('_PS_HOST_MODE_') && @file_exists($file_uri_host_mode.$file)))
			$plugin_path['js'] = Media::getJSPath($folder.$file);
		elseif (@file_exists($file_uri.$name.'/'.$file) || (defined('_PS_HOST_MODE_') && @file_exists($file_uri_host_mode.$name.'/'.$file)))
			$plugin_path['js'] = Media::getJSPath($folder.$name.'/'.$file);
		else
			return false;
		$plugin_path['css'] = Media::getJqueryPluginCSSPath($name, $folder);

		return $plugin_path;
	}

	/**
	 * return jquery plugin css path if exist.
	 *
	 * @param mixed $name
	 * @return string|boolean
	 */
	public static function getJqueryPluginCSSPath($name, $folder = null)
	{
		if ($folder === null)
			$folder = _PS_JS_DIR_.'jquery/plugins/'; //set default folder
		$file = 'jquery.'.$name.'.css';
		$url_data = parse_url($folder);
		$file_uri = _PS_ROOT_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		$file_uri_host_mode = _PS_CORE_DIR_.Tools::str_replace_once(__PS_BASE_URI__, DIRECTORY_SEPARATOR, $url_data['path']);
		
		if (@file_exists($file_uri.$file) || (defined('_PS_HOST_MODE_') && @file_exists($file_uri_host_mode.$file)))
			return Media::getCSSPath($folder.$file);
		elseif (@file_exists($file_uri.$name.'/'.$file) || (defined('_PS_HOST_MODE_') && @file_exists($file_uri_host_mode.$name.'/'.$file)))
			return Media::getCSSPath($folder.$name.'/'.$file);
		else
			return false;
	}

	/**
	* Combine Compress and Cache CSS (ccc) calls
	*
	* @param array css_files
	* @return array processed css_files
	*/
	public static function cccCss($css_files)
	{
		//inits
		$css_files_by_media = array();
		$external_css_files = array(); 
		$compressed_css_files = array();
		$compressed_css_files_not_found = array();
		$compressed_css_files_infos = array();
		$protocol_link = Tools::getCurrentUrlProtocolPrefix();
		$cache_path = _PS_THEME_DIR_.'cache/';

		// 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);

			if(array_key_exists('host', $url_data))
			{
				$external_css_files[$filename] = $media;
				continue;
			}

			$infos['path'] = _PS_ROOT_DIR_.Tools::str_replace_once(__PS_BASE_URI__, '/', $url_data['path']);

			if (!@filemtime($infos['path']))
				$infos['path'] = _PS_CORE_DIR_.Tools::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
		$version = (int)Configuration::get('PS_CCCCSS_VERSION');
		foreach ($compressed_css_files_infos as $media => &$info)
		{
			$key = md5($info['key'].$protocol_link);
			$filename = $cache_path.'v_'.$version.'_'.$key.'_'.$media.'.css';

			$info = array(
				'key' => $key,
				'date' => file_exists($filename) ? @filemtime($filename) : 0
			);
		}

		foreach ($css_files_by_media as $media => $media_infos)
		{
			if ($media_infos['date'] > $compressed_css_files_infos[$media]['date'])
			{
				if ($compressed_css_files_infos[$media]['date'])
				{
					Configuration::updateValue('PS_CCCCSS_VERSION', ++$version);
					break;
				}
			}
		}

		// aggregate and compress css files content, write new caches files
		$import_url = array();
		foreach ($css_files_by_media as $media => $media_infos)
		{
			$cache_filename = $cache_path.'v_'.$version.'_'.$compressed_css_files_infos[$media]['key'].'_'.$media.'.css';
			if ($media_infos['date'] > $compressed_css_files_infos[$media]['date'])
			{
				$cache_filename = $cache_path.'v_'.$version.'_'.$compressed_css_files_infos[$media]['key'].'_'.$media.'.css';
				$compressed_css_files[$media] = '';
				foreach ($media_infos['files'] as $file_infos)
				{
					if (file_exists($file_infos['path']))
						$compressed_css_files[$media] .= Media::minifyCSS(file_get_contents($file_infos['path']), $file_infos['uri'], $import_url);
					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];

				$content = '@charset "UTF-8";'."\n".$content;
				$content = implode('', $import_url).$content;
				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);
			$css_files[$protocol_link.Tools::getMediaServer($url).$url] = $media;
		}
		return array_merge($external_css_files, $css_files); 
	}

	public static function getBackTrackLimit()
	{
		static $limit = null;
		if ($limit === null)
		{
			$limit = @ini_get('pcre.backtrack_limit');
			if (!$limit)
				$limit = -1;
		}

		return $limit;
	}

	/**
	* Combine Compress and Cache (ccc) JS calls
	*
	* @param array js_files
	* @return array processed js_files
	*/
	public static function cccJS($js_files)
	{
		//inits
		$compressed_js_files_not_found = array();
		$js_files_infos = array();
		$js_files_date = 0;
		$compressed_js_filename = '';
		$js_external_files = array();
		$protocol_link = Tools::getCurrentUrlProtocolPrefix();
		$cache_path = _PS_THEME_DIR_.'cache/';

		// get js files infos
		foreach ($js_files as $filename)
		{
			if (Validate::isAbsoluteUrl($filename))
				$js_external_files[] = $filename;
			else
			{
				$infos = array();
				$infos['uri'] = $filename;
				$url_data = parse_url($filename);
				$infos['path'] = _PS_ROOT_DIR_.Tools::str_replace_once(__PS_BASE_URI__, '/', $url_data['path']);

				if (!@filemtime($info['path']))
					$infos['path'] = _PS_CORE_DIR_.Tools::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);
		$version = (int)Configuration::get('PS_CCCJS_VERSION');
		$compressed_js_path = $cache_path.'v_'.$version.'_'.$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 > $compressed_js_file_date)
		{
			if ($compressed_js_file_date)
				Configuration::updateValue('PS_CCCJS_VERSION', ++$version);

			$compressed_js_path = $cache_path.'v_'.$version.'_'.$compressed_js_filename.'.js';
			$content = '';
			foreach ($js_files_infos as $file_infos)
			{
				if (file_exists($file_infos['path']))
				{
					$tmp_content = file_get_contents($file_infos['path']);
					if (preg_match('@\.(min|pack)\.[^/]+$@', $file_infos['path'], $matches))
						$content .= preg_replace('/\/\/@\ssourceMappingURL\=[_a-zA-Z0-9-.]+\.'.$matches[1].'\.map\s+/', '', $tmp_content);
					else
						$content .= Media::packJS($tmp_content);
				}
				else
					$compressed_js_files_not_found[] = $file_infos['path'];
			}

			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
		if (strpos($compressed_js_path, _PS_ROOT_DIR_) !== false)
			$url = str_replace(_PS_ROOT_DIR_.'/', __PS_BASE_URI__, $compressed_js_path);

		if (strpos($compressed_js_path, _PS_CORE_DIR_) !== false)
			$url = str_replace(_PS_CORE_DIR_.'/', __PS_BASE_URI__, $compressed_js_path);

		return array_merge(array($protocol_link.Tools::getMediaServer($url).$url), $js_external_files);
	}
	
	public static function clearCache()
	{
		foreach (array(_PS_THEME_DIR_.'cache') as $dir)
			if (file_exists($dir))
				foreach (scandir($dir) as $file)
					if ($file[0] != '.' && $file != 'index.php')
						Tools::deleteFile($dir.DIRECTORY_SEPARATOR.$file, array('index.php'));

		$version = (int)Configuration::get('PS_CCCJS_VERSION');
		Configuration::updateValue('PS_CCCJS_VERSION', ++$version);
		$version = (int)Configuration::get('PS_CCCCSS_VERSION');
		Configuration::updateValue('PS_CCCCSS_VERSION', ++$version);
	}

	public static function getJsDef()
	{
		ksort(Media::$js_def);
		return Media::$js_def;
	}

	public static function getInlineScript()
	{
		return Media::$inline_script;
	}

	/**
	 * Add a new javascript definition at bottom of page
	 *
	 * @param mixed $js_def
	 * @return void
	 */
	public static function addJsDef($js_def)
	{
		if (is_array($js_def))
			foreach ($js_def as $key => $js)
					Media::$js_def[$key] = $js;
		elseif ($js_def)
			Media::$js_def[] = $js_def;
	}

	/**
	 * Add a new javascript definition from a capture at bottom of page
	 *
	 * @param mixed $js_def
	 * @return void
	 */
	public static function addJsDefL($params, $content, $smarty, &$repeat)
	{
		if (!$repeat && isset($params) && is_array($params) && Tools::strlen($content))
			foreach($params as $param)
				Media::$js_def[$param] = $content;
	}
	
	public static function deferInlineScripts($output)
	{
		/* Try to enqueue in js_files inline scripts with src but without conditionnal comments */
		$dom = new DOMDocument();
		libxml_use_internal_errors(true);
		@$dom->loadHTML(($output));
		libxml_use_internal_errors(false);
		$scripts = $dom->getElementsByTagName('script');
		if (is_object($scripts) && $scripts->length)
			foreach ($scripts as $script)
				if ($src = $script->getAttribute('src'))
				{
			  		if (substr($src, 0, 2) == '//')
						$src = Tools::getCurrentUrlProtocolPrefix().substr($src, 2);

					$patterns = array(
						'#code\.jquery\.com/jquery-([0-9\.]+)(\.min)*\.js$#Ui',
						'#ajax\.googleapis\.com/ajax/libs/jquery/([0-9\.]+)/jquery(\.min)*\.js$#Ui',
						'#ajax\.aspnetcdn\.com/ajax/jquery/jquery-([0-9\.]+)(\.min)*\.js$#Ui',
						'#cdnjs\.cloudflare\.com/ajax/libs/jquery/([0-9\.]+)/jquery(\.min)*\.js$#Ui',
						'#/jquery-([0-9\.]+)(\.min)*\.js$#Ui'
					);

					foreach($patterns as $pattern)
					{
						$matches = array();
						if (preg_match($pattern, $src, $matches))
						{
							$minifier = $version = false;
							if (isset($matches[2]) && $matches[2])
								$minifier = (bool)$matches[2];
							if (isset($matches[1]) && $matches[1])
								$version = $matches[1];
							if ($version)
							{
								if ($version != _PS_JQUERY_VERSION_)
									Context::getContext()->controller->addJquery($version, null, $minifier);
								array_push(Media::$inline_script_src, $src);
							}
						}

					}
					if (!in_array($src, Media::$inline_script_src))
						Context::getContext()->controller->addJS($src);
				}
		$output = preg_replace_callback('/<script[^>]*>(.*)<\s*\/script\s*[^>]*>/Uims', array('Media', 'deferScript'), $output);
		return $output;
	}
	
	public static function deferScript($matches)
	{
		if (!is_array($matches))
			return false;
		$inline = '';

		if (isset($matches[0]))
			$original = trim($matches[0]);

		if (isset($matches[1]))
			$inline = trim($matches[1]);

		/* This is an inline script, add its content to inline scripts stack then remove it from content */
		if (!empty($inline) && preg_match('/<\s*[\/]script[^>]*>/ims', $original) !== false && Media::$inline_script[] = $inline)
			return '';

		/* This is an external script, if it already belongs to js_files then remove it from content */
		preg_match('/src\s*=\s*["\']?([^"\']*)[^>]/ims', $original, $results);
		if (array_key_exists(1, $results))
		{
			if (substr($results[1], 0, 2) == '//')
			{
				$protocol_link = Tools::getCurrentUrlProtocolPrefix();
				$results[1] = $protocol_link.ltrim($results[1], '/');
			}
			if (in_array($results[1], Context::getContext()->controller->js_files) || in_array($results[1], Media::$inline_script_src))
				return '';
		}

		/* return original string because no match was found */
		return $original;
	}
}