<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Feed_Writer
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/**
* @namespace
*/
namespace Zend\Feed\Writer\Renderer\Entry;
use Zend\Feed\Writer\Renderer;
use Zend\Feed\Writer;
use Zend\Date;
use Zend\URI;

/**
* @uses \Zend\Date\Date
* @uses \Zend\Feed\Exception
* @uses \Zend\Feed\Writer\Renderer\RendererAbstract
* @uses \Zend\Feed\Writer\Renderer\RendererInterface
* @uses \Zend\Uri\Uri
* @category Zend
* @package Zend_Feed_Writer
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Rss extends Renderer\AbstractRenderer implements Renderer\Renderer
{
    /**
     * Constructor
     * 
     * @param  Zend_Feed_Writer_Entry $container 
     * @return void
     */
    public function __construct (Writer\Entry $container)
    {
        parent::__construct($container);
    }
    
    /**
     * Render RSS entry
     * 
     * @return Zend_Feed_Writer_Renderer_Entry_Rss
     */
    public function render()
    {
        $this->_dom = new \DOMDocument('1.0', $this->_container->getEncoding());
        $this->_dom->formatOutput = true;
        $this->_dom->substituteEntities = false;
        $entry = $this->_dom->createElement('item');
        $this->_dom->appendChild($entry);
        
        $this->_setTitle($this->_dom, $entry);
        $this->_setDescription($this->_dom, $entry);
        $this->_setDateCreated($this->_dom, $entry);
        $this->_setDateModified($this->_dom, $entry);
        $this->_setLink($this->_dom, $entry);
        $this->_setId($this->_dom, $entry);
        $this->_setAuthors($this->_dom, $entry);
        $this->_setEnclosure($this->_dom, $entry);
        $this->_setCommentLink($this->_dom, $entry);
        $this->_setCategories($this->_dom, $entry);
        foreach ($this->_extensions as $ext) {
            $ext->setType($this->getType());
            $ext->setRootElement($this->getRootElement());
            $ext->setDOMDocument($this->getDOMDocument(), $entry);
            $ext->render();
        }

        return $this;
    }
    
    /**
     * Set entry title
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setTitle(\DOMDocument $dom, \DOMElement $root)
    {
        if(!$this->getDataContainer()->getDescription()
        && !$this->getDataContainer()->getTitle()) {
            $message = 'RSS 2.0 entry elements SHOULD contain exactly one'
            . ' title element but a title has not been set. In addition, there'
            . ' is no description as required in the absence of a title.';
            $exception = new Writer\Exception($message);
            if (!$this->_ignoreExceptions) {
                throw $exception;
            } else {
                $this->_exceptions[] = $exception;
                return;
            }
        }
        $title = $dom->createElement('title');
        $root->appendChild($title);
        $text = $dom->createTextNode($this->getDataContainer()->getTitle());
        $title->appendChild($text);
    }
    
    /**
     * Set entry description
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setDescription(\DOMDocument $dom, \DOMElement $root)
    {
        if(!$this->getDataContainer()->getDescription()
        && !$this->getDataContainer()->getTitle()) {
            $message = 'RSS 2.0 entry elements SHOULD contain exactly one'
            . ' description element but a description has not been set. In'
            . ' addition, there is no title element as required in the absence'
            . ' of a description.';
            $exception = new Writer\Exception($message);
            if (!$this->_ignoreExceptions) {
                throw $exception;
            } else {
                $this->_exceptions[] = $exception;
                return;
            }
        }
        if (!$this->getDataContainer()->getDescription()) {
            return;
        }
        $subtitle = $dom->createElement('description');
        $root->appendChild($subtitle);
        $text = $dom->createCDATASection($this->getDataContainer()->getDescription());
        $subtitle->appendChild($text);
    }
    
    /**
     * Set date entry was last modified
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setDateModified(\DOMDocument $dom, \DOMElement $root)
    {
        if(!$this->getDataContainer()->getDateModified()) {
            return;
        }

        $updated = $dom->createElement('pubDate');
        $root->appendChild($updated);
        $text = $dom->createTextNode(
            $this->getDataContainer()->getDateModified()->get(Date\Date::RSS)
        );
        $updated->appendChild($text);
    }
    
    /**
     * Set date entry was created
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setDateCreated(\DOMDocument $dom, \DOMElement $root)
    {
        if (!$this->getDataContainer()->getDateCreated()) {
            return;
        }
        if (!$this->getDataContainer()->getDateModified()) {
            $this->getDataContainer()->setDateModified(
                $this->getDataContainer()->getDateCreated()
            );
        }
    }
    
    /**
     * Set entry authors
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setAuthors(\DOMDocument $dom, \DOMElement $root)
    {
        $authors = $this->_container->getAuthors();
        if ((!$authors || empty($authors))) {
            return;
        }
        foreach ($authors as $data) {
            $author = $this->_dom->createElement('author');
            $name = $data['name'];
            if (array_key_exists('email', $data)) {
                $name = $data['email'] . ' (' . $data['name'] . ')';
            }
            $text = $dom->createTextNode($name);
            $author->appendChild($text);
            $root->appendChild($author);
        }
    }
    
    /**
     * Set entry enclosure
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setEnclosure(\DOMDocument $dom, \DOMElement $root)
    {
        $data = $this->_container->getEnclosure();
        if ((!$data || empty($data))) {
            return;
        }
        if (!isset($data['type'])) {
            $exception = new Writer\Exception('Enclosure "type" is not set');
            if (!$this->_ignoreExceptions) {
                throw $exception;
            } else {
                $this->_exceptions[] = $exception;
                return;
            }
        }
        if (!isset($data['length'])) {
            $exception = new Writer\Exception('Enclosure "length" is not set');
            if (!$this->_ignoreExceptions) {
                throw $exception;
            } else {
                $this->_exceptions[] = $exception;
                return;
            }
        }
        if (isset($data['length']) && (int) $data['length'] <= 0) {
            $exception = new Writer\Exception('Enclosure "length" must be an integer'
            . ' indicating the content\'s length in bytes');
            if (!$this->_ignoreExceptions) {
                throw $exception;
            } else {
                $this->_exceptions[] = $exception;
                return;
            }
        }
        $enclosure = $this->_dom->createElement('enclosure');
        $enclosure->setAttribute('type', $data['type']);
        $enclosure->setAttribute('length', $data['length']);
        $enclosure->setAttribute('url', $data['uri']);
        $root->appendChild($enclosure);
    }
    
    /**
     * Set link to entry
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setLink(\DOMDocument $dom, \DOMElement $root)
    {
        if(!$this->getDataContainer()->getLink()) {
            return;
        }
        $link = $dom->createElement('link');
        $root->appendChild($link);
        $text = $dom->createTextNode($this->getDataContainer()->getLink());
        $link->appendChild($text);
    }
    
    /**
     * Set entry identifier
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setId(\DOMDocument $dom, \DOMElement $root)
    {
        if(!$this->getDataContainer()->getId()
        && !$this->getDataContainer()->getLink()) {
            return;
        }

        $id = $dom->createElement('guid');
        $root->appendChild($id);
        if (!$this->getDataContainer()->getId()) {
            $this->getDataContainer()->setId(
                $this->getDataContainer()->getLink());
        }
        $text = $dom->createTextNode($this->getDataContainer()->getId());
        $id->appendChild($text);
        if (!Uri\Url::validate($this->getDataContainer()->getId())) {
            $id->setAttribute('isPermaLink', 'false');
        }
    }
    
    /**
     * Set link to entry comments
     * 
     * @param  \DOMDocument $dom 
     * @param  \DOMElement $root 
     * @return void
     */
    protected function _setCommentLink(\DOMDocument $dom, \DOMElement $root)
    {
        $link = $this->getDataContainer()->getCommentLink();
        if (!$link) {
            return;
        }
        $clink = $this->_dom->createElement('comments');
        $text = $dom->createTextNode($link);
        $clink->appendChild($text);
        $root->appendChild($clink);
    }
    
    /**
     * Set entry categories
     * 
     * @param \DOMDocument $dom 
     * @param \DOMElement $root 
     * @return void
     */
    protected function _setCategories(\DOMDocument $dom, \DOMElement $root)
    {
        $categories = $this->getDataContainer()->getCategories();
        if (!$categories) {
            return;
        }
        foreach ($categories as $cat) {
            $category = $dom->createElement('category');
            if (isset($cat['scheme'])) {
                $category->setAttribute('domain', $cat['scheme']);
            }
            $text = $dom->createCDATASection($cat['term']);
            $category->appendChild($text);
            $root->appendChild($category);
        }
    }
}