<?php
/**
 * WBEvent_Handler_Dereferencer
 *
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage base
 */

WBClass::load('WBEvent_Handler');

/**
 * WBEvent_Handler_Dereferencer
 *
 * Update references of some WXML content
 *
 * @version 0.4.0
 * @package Wombat
 * @subpackage base
 */
class WBEvent_Handler_Dereferencer extends WBEvent_Handler
{
    /**
     * handler config
     *
     * - source name of source (like "blog" or "wxmlarticle" resp. "wxmlarticletranslation")
     *
     * @var array
     */
    protected $config   =   array(
                                'source'        =>  '',
                                );

    /**
     * markup scanner
     * @var WBMarkup_Scanner
     */
    private $scanner;

    /**
     * markup scanner handler dereferer
     * @var WBMarkup_Hander_Dereferer
     */
    private $dref;

    /**
     * update column in table
     *
     * Update exactly one column in one table for one row using primary key
     * Hence primary key is required, as well as column and table name.
     *
     * @param WBEvent $e
     * @return bool true to continue, false to stop processing
     * @throws Exception in case of error
     */
    public function process(WBEvent $e)
    {
        $url            =   $this->getUrlAndPath($e);

        $this->scanner  =   WBClass::create( 'WBMarkup_Scanner' );
        $this->dref     =   WBClass::create( 'WBMarkup_Handler_Dereferer' );

        $this->scanner->setHandler($this->dref);
        $this->scanner->scan($e->get('body'));
        $this->dref->setUrl($url[0], $url[1]);
        $this->dref->save();

        return true;
    }

    /**
     * get URL and path
     *
     * Tell URL and path for current source
     *
     * @param WBEvent $e
     * @return array
     */
    private function getUrlAndPath(WBEvent $e)
    {
        if (empty($this->config['source'])) {
            WBClass::load('WBException_Config');
            throw new WBException_Config('Source must not be empty!', 1, __CLASS__);
        }

        $url    =   '';
        $path   =   '';
        switch ($this->config['source']) {
            case 'blog':
                $url    =   $this->getUrl4Blog($e);
                break;


            case 'wxmlarticle':
            case 'wxmlarticletranslation':
                $url    =   $e->get('url');
                $path   =   $e->get('cs') . '/' . $e->get('lang', 'C');
                break;

            default:
                WBClass::load('WBException_Config');
                throw new WBException_Config('Source name is invalid!', 2, __CLASS__);
                break;
        }

        return array($url, $path);
    }

    /**
     * get blog article's URL
     *
     * Use blog-config to build proper URL
     *
     * @return string
     */
    private function getUrl4Blog(WBEvent $e)
    {
        WBClass::load('WBString');
        $blog   =   WBClass::create('WBBlog_Tool');
        /** @var $blog WBBlog_Tool */
        $blog->loadArticleByData($e->get());
        $url    =   $blog->getArticleUrl();

        return WBString::replaceSuperPlaceholders($url);
    }
}
?>