<?php
/**
 * XML Export class for phpMyFAQ
 *
 * PHP 5.2
 *
 * This Source Code Form is subject to the terms of the Mozilla Public License,
 * v. 2.0. If a copy of the MPL was not distributed with this file, You can
 * obtain one at http://mozilla.org/MPL/2.0/.
 *
 * @category  phpMyFAQ
 * @package   Export
 * @author    Thorsten Rinne <thorsten@phpmyfaq.de>
 * @since     2009-10-07
 * @license   Mozilla Public License 1.1
 * @copyright 2009-2013 phpMyFAQ Team
 */

if (!defined('IS_VALID_PHPMYFAQ')) {
    exit();
}

/**
 * PMF_Export_Xml
 *
 * @category  phpMyFAQ
 * @package   Export
 * @author    Thorsten Rinne <thorsten@phpmyfaq.de>
 * @since     2009-10-07
 * @license   Mozilla Public License 1.1
 * @copyright 2009 phpMyFAQ Team
 */
class PMF_Export_Xml extends PMF_Export 
{
    /**
     * XMLWriter object
     *
     * @var XMLWriter
     */
    private $xml = null;
    
    /**
     * Constructor
     *
     * @param PMF_Faq           $faq      Faq object
     * @param PMF_Category      $category Category object
     * @param PMF_Configuration $config   Configuration
     *
     * return PMF_Export_Xml
     */
    public function __construct(PMF_Faq $faq, PMF_Category $category, PMF_Configuration $config)
    {
        $this->faq      = $faq;
        $this->category = $category;
        $this->_config  = $config;
        $this->xml      = new XMLWriter();
        
        $this->xml->openMemory();
        $this->xml->setIndent(true);
    }
    
    /**
     * Generates the export
     *
     * @param integer $categoryId Category Id
     * @param boolean $downwards  If true, downwards, otherwise upward ordering
     * @param string  $language   Language
     *
     * @return string
     */
    public function generate($categoryId = 0, $downwards = true, $language = '')
    {
        // Initialize categories
        $this->category->transform($categoryId);
        
        $faqdata = $this->faq->get(FAQ_QUERY_TYPE_EXPORT_XML, $categoryId, $downwards, $language);
        $version = $this->_config->get('main.currentVersion');
        $comment = sprintf('XML output by phpMyFAQ %s | Date: %s', 
          $version, 
          PMF_Date::createIsoDate(date("YmdHis")));
        
        $this->xml->startDocument('1.0', 'utf-8', 'yes');
        $this->xml->writeComment($comment);
        $this->xml->startElement('phpmyfaq');
        
        if (count($faqdata)) {
            foreach ($faqdata as $data) {
                
                // Build the <article/> node
                $this->xml->startElement('article');
                $this->xml->writeAttribute('id', $data['id']);
                $this->xml->writeElement('language', $data['lang']);
                $this->xml->writeElement('category', $this->category->getPath($data['category_id'], ' >> '));
                
                if (!empty($data['keywords'])) {
                    $this->xml->writeElement('keywords', $data['keywords']);
                } else {
                    $this->xml->writeElement('keywords');
                }
                
                $this->xml->writeElement('question', strip_tags($data['topic']));
                $this->xml->writeElement('answer', PMF_String::htmlspecialchars($data['content']));

                if (!empty($data['author_name'])) {
                    $this->xml->writeElement('author', $data['author_name']);
                } else {
                    $this->xml->writeElement('author');
                }
                
                $this->xml->writeElement('data', PMF_Date::createIsoDate($data['lastmodified']));
                $this->xml->endElement();
            }
                
        }
        
        $this->xml->endElement();
        
        header('Content-type: text/xml'); 
        return $this->xml->outputMemory();
    }
}