<?php
/*
StatusNet Plugin: 0.9
Plugin Name: Minify
Description: Minifies resources (Javascript and CSS)
Version: 0.1
Author: Craig Andrews <candrews@integralblue.com>
Author URI: http://candrews.integralblue.com/
*/

/*
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2009, StatusNet, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * @package MinifyPlugin
 * @maintainer Craig Andrews <candrews@integralblue.com>
 * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
 */

if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }

// We bundle the minify library...
set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . '/extlib/minify/min/lib');

class MinifyPlugin extends Plugin
{
    private $minifyInlineJs = true;
    private $minifyInlineCss = true;

    const cacheKey = 'minify';

    /**
     * Add Minification related paths to the router table
     *
     * Hook for RouterInitialized event.
     *
     * @return boolean hook return
     */
    function onStartInitializeRouter($m)
    {
        $m->connect('main/min',
                    array('action' => 'minify'));
        return true;
    }

    function onAutoload($cls)
    {
        switch ($cls)
        {
         case 'MinifyAction':
            require_once(INSTALLDIR.'/plugins/Minify/' . strtolower(mb_substr($cls, 0, -6)) . '.php');
            return false;
         default:
            return true;
        }
    }

    function onLoginAction($action, &$login)
    {
        switch ($action)
        {
         case 'minify':
            $login = true;
            return false;
         default:
            return true;
        }
    }

    function onStartScriptElement($action,&$src,&$type) {
        $url = parse_url($src);
        if( empty($url['scheme']) && empty($url['host']) && empty($url['query']) && empty($url['fragment']))
        {
            if (strpos($src, 'plugins/') === 0 || strpos($src, 'local/') === 0) {
                $src = $this->minifyUrl($src);
            } else {
                $src = $this->minifyUrl('js/'.$src);
            }
        }
    }

    function onStartCssLinkElement($action,&$src,&$theme,&$media) {
        $allowThemeMinification =
            is_null(common_config('theme', 'dir'))
            && is_null(common_config('theme', 'path'))
            && is_null(common_config('theme', 'server'));
        $url = parse_url($src);
        if( empty($url['scheme']) && empty($url['host']) && empty($url['query']) && empty($url['fragment']))
        {
            if(!isset($theme)) {
                $theme = common_config('site', 'theme');
            }
            if($allowThemeMinification && file_exists(INSTALLDIR.'/local/theme/'.$theme.'/'.$src)) {
                $src = $this->minifyUrl('local/theme/'.$theme.'/'.$src);
            } else if($allowThemeMinification && file_exists(INSTALLDIR.'/theme/'.$theme.'/'.$src)) {
                $src = $this->minifyUrl('theme/'.$theme.'/'.$src);
            }else if(file_exists(INSTALLDIR.'/'.$src)){
                $src = $this->minifyUrl($src);
            }
        }
    }

    function onStartInlineScriptElement($action,&$code,&$type)
    {
        if($this->minifyInlineJs && $type=='text/javascript'){
            $c = Cache::instance();
            if (!empty($c)) {
                $cacheKey = Cache::key(self::cacheKey . ':' . crc32($code));
                $out = $c->get($cacheKey);
            }
            if(empty($out)) {
                $out = $this->minifyJs($code);
            }
            if (!empty($c)) {
                $c->set($cacheKey, $out);
            }
            if(!empty($out)) {
                $code = $out;
            }
        }
    }

    function onStartStyleElement($action,&$code,&$type,&$media)
    {
        if($this->minifyInlineCss && $type=='text/css'){
            $c = Cache::instance();
            if (!empty($c)) {
                $cacheKey = Cache::key(self::cacheKey . ':' . crc32($code));
                $out = $c->get($cacheKey);
            }
            if(empty($out)) {
                $out = $this->minifyCss($code);
            }
            if (!empty($c)) {
                $c->set($cacheKey, $out);
            }
            if(!empty($out)) {
                $code = $out;
            }
        }
    }

    function minifyUrl($src) {
        return common_local_url('minify',null,array('f' => $src ,v => STATUSNET_VERSION));
    }

    static function minifyJs($code) {
        require_once('JSMin.php');
        return JSMin::minify($code);
    }

    static function minifyCss($code, $options = array()) {
        require_once('Minify/CSS.php');
        return Minify_CSS::minify($code,$options);
    }

    function onPluginVersion(&$versions)
    {
        $versions[] = array('name' => 'Minify',
                            'version' => STATUSNET_VERSION,
                            'author' => 'Craig Andrews',
                            'homepage' => 'http://status.net/wiki/Plugin:Minify',
                            'rawdescription' =>
                            // TRANS: Plugin description.
                            _m('The Minify plugin minifies StatusNet\'s CSS and JavaScript, removing whitespace and comments.'));
        return true;
    }
}
