<?php
/**
 * EGroupware API - Bundle JS includes
 *
 * @link http://www.egroupware.org
 * @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package api
 * @subpackage framework
 * @access public
 * @version $Id$
 */

namespace EGroupware\Api\Framework;

use EGroupware\Api\Cache;
use EGroupware\Api\Header\UserAgent;

/**
 * Bundle JS includes
 */
class Bundle
{
	/**
	 * Url of minified version of bundle
	 *
	 * @var array
	 */
	static $bundle2minurl = array(
		'api' => '/api/js/jsapi.min.js',
		'et2' => '/api/js/etemplate/etemplate2.min.js',
		'et21'=> '/api/js/etemplate/etemplate2.min.js',
		'pixelegg' => '/pixelegg/js/fw_pixelegg.min.js',
		'jdots' => '/jdots/js/fw_jdots.min.js',
		'mobile' => '/pixelegg/js/fw_mobile.min.js',
	);

	/**
	 * Devide js-includes in bundles of javascript files to include eg. api or etemplate2, if minifying is enabled
	 *
	 * @param array $js_includes files to include with egw relative url
	 * @return array egw relative urls to include incl. bundels/minify urls, if enabled
	 */
	public static function js_includes(array $js_includes)
	{
		$file2bundle = array();
		if ($GLOBALS['egw_info']['server']['debug_minify'] !== 'True')
		{
			// get used bundles and cache them on tree-level for 2h
			//$bundles = self::all(); Cache::setTree(__CLASS__, 'bundles', $bundles, 7200);
			$bundles = Cache::getTree(__CLASS__, 'bundles', array(__CLASS__, 'all'), array(), 7200);
			$bundles_ts = $bundles['.ts'];
			unset($bundles['.ts']);
			foreach($bundles as $name => $files)
			{
				// to facilitate move to new api/et2 location, can be removed after 16.1 release
				if ($name == 'et21' && !in_array('/api/js/etemplate/etemplate2.js', $files) ||
					$name == 'api' && !in_array('/vendor/bower-asset/jquery/dist/jquery.js', $files))
				{
					Cache::unsetTree(__CLASS__, 'bundles');
					return self::js_includes($js_includes);
				}
				// ignore bundles of not used templates, as they can contain identical files
				if (in_array($name, array('api', 'et2', 'et21')) ||
					$name == (UserAgent::mobile() ? 'mobile' : $GLOBALS['egw_info']['server']['template_set']) ||
					isset($GLOBALS['egw_info']['apps'][$name]))
				{
					$file2bundle += array_combine($files, array_fill(0, count($files), $name));
				}
			}
			//error_log(__METHOD__."() file2bundle=".array2string($file2bundle));
		}
		$to_include = $included_bundles = array();
		$query = null;
		foreach($js_includes as $file)
		{
			if ($file == '/api/js/jsapi/egw.js') continue;	// loaded via own tag, and we must not load it twice!

			if (!isset($to_include[$file]))
			{
				if (($bundle = $file2bundle[$file]))
				{
					//error_log(__METHOD__."() requiring bundle $bundle for $file");
					if (!in_array($bundle, $included_bundles))
					{
						$included_bundles[] = $bundle;
						$minurl = self::$bundle2minurl[$bundle];
						if (!isset($minurl) && isset($GLOBALS['egw_info']['apps'][$bundle]))
						{
							$minurl = '/'.$bundle.'/js/app.min.js';
						}
						$max_modified = 0;
						$to_include = array_merge($to_include, self::urls($bundles[$bundle], $max_modified, $minurl));
						// check if bundle-config is more recent then
						if ($max_modified > $bundles_ts)
						{
							// force new bundle Config by deleting cached one and call ourself again
							Cache::unsetTree(__CLASS__, 'bundles');
							return self::js_includes($js_includes);
						}
					}
				}
				else
				{
					unset($query);
					list($path, $query) = explode('?', $file, 2);
					$mod = filemtime(EGW_SERVER_ROOT.$path);
					// check if we have a more recent minified version of the file and use it
					if ($GLOBALS['egw_info']['server']['debug_minify'] !== 'True' &&
						substr($path, -3) == '.js' && file_exists(EGW_SERVER_ROOT.($min_path = substr($path, 0, -3).'.min.js')) &&
						(($min_mod = filemtime(EGW_SERVER_ROOT.$min_path)) >= $mod))
					{
						$path = $min_path;
						$mod  = $min_mod;
					}
					$to_include[$file] = $path.'?'.$mod.($query ? '&'.$query : '');
				}
			}
		}
		//error_log(__METHOD__."(".array2string($js_includes).') debug_minify='.array2string($GLOBALS['egw_info']['server']['debug_minify']).', include_bundels='.array2string($included_bundles).' returning '.array2string(array_values(array_unique($to_include))));
		return array_values(array_unique($to_include));
	}

	/**
	 * Generate bundle url(s) for given js files
	 *
	 * @param array $js_includes
	 * @param int& $max_modified =null on return maximum modification time of bundle
	 * @param string $minurl =null url of minified bundle, to be used, if existing and recent
	 * @return array js-files (can be more then one, if one of given files can not be bundeled)
	 */
	protected static function urls(array $js_includes, &$max_modified=null, $minurl=null)
	{
		$debug_minify = $GLOBALS['egw_info']['server']['debug_minify'] === 'True';
		// ignore not existing minurl
		if (!empty($minurl) && !file_exists(EGW_SERVER_ROOT.$minurl)) $minurl = null;
		$to_include_first = $to_include = $to_minify = array();
		$max_modified = 0;
		$query = null;
		foreach($js_includes as $path)
		{
			if ($path == '/api/js/jsapi/egw.js') continue; // Leave egw.js out of bundle
			unset($query);
			list($path,$query) = explode('?',$path,2);
			$mod = filemtime(EGW_SERVER_ROOT.$path);
			if ($mod > $max_modified) $max_modified = $mod;

			// ckeditor must be included before bundled files, as they depend on it!
			if (strpos($path,'/ckeditor/ckeditor.js') !== false)
			{
				$to_include_first[] = $path . '?' . $mod;
			}
			// for now minify does NOT support query parameters, nor php files generating javascript
			elseif ($debug_minify || $query || substr($path, -3) != '.js' || empty($minurl))
			{
				$path .= '?'. $mod.($query ? '&'.$query : '');
				$to_include[] = $path;
			}
			else
			{
				$to_minify[] = substr($path,1);
			}
		}
		if (!$debug_minify && $to_minify)
		{
			$path = $minurl.'?'.filemtime(EGW_SERVER_ROOT.$minurl);
			/* no more dynamic minifying
			if (!empty($minurl) && file_exists(EGW_SERVER_ROOT.$minurl) &&
				($mod=filemtime(EGW_SERVER_ROOT.$minurl)) >= $max_modified)
			{
				$path = $minurl.'?'.$mod;
			}
			else
			{
				$base_path = $GLOBALS['egw_info']['server']['webserver_url'];
				if ($base_path[0] != '/') $base_path = parse_url($base_path, PHP_URL_PATH);
				$path = '/phpgwapi/inc/min/?'.($base_path && $base_path != '/' ? 'b='.substr($base_path, 1).'&' : '').
					'f='.implode(',', $to_minify) .
					($GLOBALS['egw_info']['server']['debug_minify'] === 'debug' ? '&debug' : '').
					'&'.$max_modified;
			}*/
			// need to include minified javascript before not minified stuff like jscalendar-setup, as it might depend on it
			array_unshift($to_include, $path);
		}
		if ($to_include_first) $to_include = array_merge($to_include_first, $to_include);
		//error_log(__METHOD__."("./*array2string($js_includes).*/", $max_modified, $minurl) returning ".array2string($to_include));
		return $to_include;
	}

	/**
	 * Maximum number of files in a bundle
	 *
	 * We split bundles, if they contain more then these number of files,
	 * because IE silently stops caching them, if Content-Length get's too big.
	 *
	 * IE11 cached 142kb compressed api bundle, but not 190kb et2 bundle.
	 * Splitting et2 bundle in max 50 files chunks, got IE11 to cache both bundles.
	 */
	const MAX_BUNDLE_FILES = 50;

	/**
	 * Return all bundels we use:
	 * - api stuff phpgwapi/js/jsapi/* and it's dependencies incl. jquery
	 * - etemplate2 stuff not including api bundle, but jquery-ui
	 *
	 * @return array bundle-url => array of contained files
	 */
	public static function all()
	{
		$inc_mgr = new IncludeMgr();
		$bundles = array();

		$max_mod = array();

		// generate api bundle
		$inc_mgr->include_js_file('/vendor/bower-asset/jquery/dist/jquery.js');
		$inc_mgr->include_js_file('/api/js/jquery/jquery.noconflict.js');
		$inc_mgr->include_js_file('/vendor/bower-asset/jquery-ui/jquery-ui.js');
		$inc_mgr->include_js_file('/api/js/jsapi/jsapi.js');
		$inc_mgr->include_js_file('/api/js/egw_json.js');
		$inc_mgr->include_js_file('/api/js/jsapi/egw.js');
		// dhtmlxTree (dhtmlxMenu get loaded via dependency in egw_menu_dhtmlx.js)
		$inc_mgr->include_js_file('/api/js/dhtmlxtree/codebase/dhtmlxcommon.js');
		$inc_mgr->include_js_file('/api/js/dhtmlxtree/sources/dhtmlxtree.js');
		$inc_mgr->include_js_file('/api/js/dhtmlxtree/sources/ext/dhtmlxtree_json.js');
		// actions
		$inc_mgr->include_js_file('/api/js/egw_action/egw_action.js');
		$inc_mgr->include_js_file('/api/js/egw_action/egw_keymanager.js');
		$inc_mgr->include_js_file('/api/js/egw_action/egw_action_popup.js');
		$inc_mgr->include_js_file('/api/js/egw_action/egw_action_dragdrop.js');
		$inc_mgr->include_js_file('/api/js/egw_action/egw_dragdrop_dhtmlx_tree.js');
		$inc_mgr->include_js_file('/api/js/egw_action/egw_menu.js');
		$inc_mgr->include_js_file('/api/js/egw_action/egw_menu_dhtmlx.js');
		// include choosen in api, as old eTemplate uses it and fail if it pulls in half of et2
		$inc_mgr->include_js_file('/api/js/jquery/chosen/chosen.jquery.js');
		// include CKEditor in api, as old eTemplate uses it too
		$inc_mgr->include_js_file('/vendor/egroupware/ckeditor/ckeditor.js');
		$inc_mgr->include_js_file('/vendor/egroupware/ckeditor/config.js');
		$bundles['api'] = $inc_mgr->get_included_files();
		self::urls($bundles['api'], $max_mod['api']);

		// generate et2 bundle (excluding files in api bundle)
		$inc_mgr->include_js_file('/api/js/etemplate/etemplate2.js');
		$bundles['et2'] = array_diff($inc_mgr->get_included_files(), $bundles['api']);
		self::urls($bundles['et2'], $max_mod['et2']);

		$stock_files = call_user_func_array('array_merge', $bundles);

		// generate template and app bundles, if installed
		foreach(array(
			'jdots' => '/jdots/js/fw_jdots.js',
			'mobile' => '/pixelegg/js/fw_mobile.js',
			'pixelegg' => '/pixelegg/js/fw_pixelegg.js',
			'calendar' => '/calendar/js/app.js',
			'mail' => '/mail/js/app.js',
			'projectmanager' => '/projectmanager/js/app.js',
		) as $bundle => $file)
		{
			if (@file_exists(EGW_SERVER_ROOT.$file))
			{
				$inc_mgr = new IncludeMgr($stock_files);	// reset loaded files to stock files
				$inc_mgr->include_js_file($file);
				$bundles[$bundle] = array_diff($inc_mgr->get_included_files(), $stock_files);
				self::urls($bundles[$bundle], $max_mod[$bundle]);
			}
		}

		// automatic split bundles with more then MAX_BUNDLE_FILES (=50) files
		foreach($bundles as $name => $files)
		{
			$n = '';
			while (count($files) > self::MAX_BUNDLE_FILES*(int)$n)
			{
				$files80 = array_slice($files, self::MAX_BUNDLE_FILES*(int)$n, self::MAX_BUNDLE_FILES, true);
				$bundles[$name.$n++] = $files80;
			}
		}

		// store max modification time of all files in all bundles
		$bundles['.ts'] = max($max_mod);

		//error_log(__METHOD__."() returning ".array2string($bundles));
		return $bundles;
	}
}