<?php
/**
 * SEF component for Joomla! 1.5
 *
 * @author      ARTIO s.r.o.
 * @copyright   ARTIO s.r.o., http://www.artio.cz
 * @package     JoomSEF
 * @version     3.1.0
 */

// Security check to ensure this file is being included by a parent file.
defined('_JEXEC') or die('Restricted access');

class plgSystemJoomsef extends JPlugin
{

    function plgSystemJoomsef( &$subject )
    {
        parent::__construct($subject);

        // load plugin parameters
        $this->_plugin = & JPluginHelper::getPlugin('system', 'joomsef');
        $this->_params = new JParameter($this->_plugin->params);
    }

    function onAfterInitialise()
    {
        global $mainframe;

        // Do not run plugin in administration area
        if ($mainframe->isAdmin()) return true;

        // Do not run plugin if SEF is disabled
        $config =& JFactory::getConfig();
        if (!$config->getValue('sef')) return true;

        // check if joomsef is enabled
        require_once( JPATH_ADMINISTRATOR.DS.'components'.DS.'com_sef'.DS.'classes'.DS.'config.php' );
        $sefConfig =& SEFConfig::getConfig();

        if ($sefConfig->enabled) {
            $router =& $mainframe->getRouter();

            // Store the router for later use
            $mainframe->set('sef.global.jrouter', $router);

            require_once( JPATH_ROOT.DS.'components'.DS.'com_sef'.DS.'sef.router.php' );
            $router = new JRouterJoomsef();
        }

        return true;
    }

    function onAfterRoute()
    {
        global $mainframe;

        // Do not run plugin in administration area
        if ($mainframe->isAdmin()) return true;

        // Do not run plugin if SEF is disabled
        $config =& JFactory::getConfig();
        if (!$config->getValue('sef')) return true;

        // check if joomsef is enabled
        require_once( JPATH_ADMINISTRATOR.DS.'components'.DS.'com_sef'.DS.'classes'.DS.'config.php' );
        $sefConfig =& SEFConfig::getConfig();

        if (!$sefConfig->enabled) return true;

        return true;
    }

    function onAfterDispatch()
    {
        global $mainframe;

        // Do not run plugin in administration area
        if ($mainframe->isAdmin()) return true;

        // Check if SEF and plugin are enabled
        if (!class_exists('JoomSEF') || !JoomSEF::enabled($this)) return true;

        // Check page base href value
        $this->_checkBaseHref();
        
        // Do not run plugin if metadata generation is disabled
        if ($this->_params->get('enable_metadata', '1') == '1') {
                // generate page title
                $this->_checkSefTitle();

                // generate page metadata
                $this->_generateMeta();     
        }

        return true;
    }

    function _generateMeta()
    {
        global $mainframe;

        $document = & JFactory::getDocument();

        $rewriteKeywords    = $this->_params->get('rewrite_keywords', '1');
        $rewriteDescription = $this->_params->get('rewrite_description', '1');

        $metadesc   = str_replace('"', '&quot;', $mainframe->get('sef.meta.desc'));
        $metakey    = str_replace('"', '&quot;', $mainframe->get('sef.meta.key'));
        $metalang   = str_replace('"', '&quot;', $mainframe->get('sef.meta.lang'));
        $metarobots = str_replace('"', '&quot;', $mainframe->get('sef.meta.robots'));
        $metagoogle = str_replace('"', '&quot;', $mainframe->get('sef.meta.google'));
        $canonicallink = str_replace('"', '&quot;', $mainframe->get('sef.link.canonical'));

        // description metatag
        if (!empty($metadesc)) {
            $oldDesc = $document->getDescription();
            $rewrite = (($rewriteDescription == '1') || ($oldDesc == ''));

            if ($rewrite) {
                $document->setDescription($metadesc);
            } else {
                $document->setDescription($metadesc . ', ' . $oldDesc);
            }
        }

        // keywords metatag
        if (!empty($metakey)) {
            $oldKey = $document->getMetaData('keywords');
            $rewrite = (($rewriteKeywords == '1') || ($oldKey == ''));

            if ($rewrite) {
                $document->setMetaData('keywords', $metakey);
            } else {
                $document->setMetaData('keywords', $metakey . ', ' . $oldKey);
            }
        }

        if (!empty($metalang))   $document->setMetaData('lang', $metalang);
        if (!empty($metarobots)) $document->setMetaData('robots', $metarobots);
        if (!empty($metagoogle)) $document->setMetaData('google', $metagoogle);
        
        if (method_exists($document, 'addHeadLink')) {
            if (!empty($canonicallink)) $document->addHeadLink($canonicallink, 'canonical');
        }
    }

    function _checkSefTitle()
    {
        global $mainframe;
        
        $document = &JFactory::getDocument();
        $config = &JFactory::getConfig();

        $sitename     = $config->getValue('sitename');
        $useMetaTitle = $config->getValue('MetaTitle');
        $preferTitle = $this->_params->get('prefer_joomsef_title', '1');
        $useSitename = $this->_params->get('use_sitename', '2');
        $sitenameSep = ' '.trim($this->_params->get('sitename_sep', '-')).' ';
        $preventDupl = $this->_params->get('prevent_dupl', '1');

        if ($sitenameSep == '  ') $sitenameSep = ' ';

        // Page title
        $pageTitle = $mainframe->get('sef.meta.title');

        if (empty($pageTitle)) {
            $pageTitle = $document->getTitle();

            // Dave: replaced regular expression as it was causing problems
            //       with site names like [ index-i.cz ] with str_replace
            // Dave: 3.2.9 fix - added check for !empty($sitename) - was causing
            //       problems with empty site names
            
            /*$pageSep = '( - |'.$sitenameSep.')';
            if (preg_match('/('.$GLOBALS['mosConfig_sitename'].$pageSep.')?(.*)?/', $pageTitle, $matches) > 0) {
            $pageTitle = strtr($pageTitle, array($matches[1] => ''));
            }*/
            if (!empty($sitename)) {
                $pageTitle = str_replace(array($sitename.' - ', $sitename.$sitenameSep), array('', ''), $pageTitle);
            }
        }

        if ($preferTitle) {
            $pageTitle = trim($pageTitle);

            // Prevent name duplicity if set to
            if ($preventDupl && strcmp($pageTitle, trim($sitename)) == 0) {
                $pageTitle = '';
            }

            if (empty($pageTitle)) $sitenameSep = '';

            if ($useSitename == 1 && $sitename) {
                $pageTitle = $sitename . $sitenameSep . $pageTitle;
            }
            elseif ($useSitename == 2 && $sitename) {
                $pageTitle .= $sitenameSep . $sitename;
            }

            $pageTitle = str_replace('"', '&quot;', $pageTitle);
            
            // set page title and (optionally) meta title tag
            if ($pageTitle) {
                $document->setTitle($pageTitle);
                
                // set title meta tag (if enabled in global Joomla config)
                if ($useMetaTitle) {
                    $document->setMetaData('title', $pageTitle);
                }
            }
        }
    }
    
    function _checkBaseHref()
    {
        $checkBaseHref = $this->_params->get('check_base_href', '1');
            	        
    	// now we can set base href
        $document =& JFactory::getDocument();
        if ($checkBaseHref == _COM_SEF_BASE_HOMEPAGE) {
        	$document->setBase(JURI::base());
        }
        elseif ($checkBaseHref == _COM_SEF_BASE_CURRENT) {
        	$document->setBase(JURI::current());
        }
        elseif ($checkBaseHref == _COM_SEF_BASE_NONE) {
        	$document->setBase('');
        }
        else return;       
    }
    
}
?>