<?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_Gdata
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/**
 * @see Zend_Gdata_YouTube
 */
require_once 'Zend/Gdata/YouTube.php';

/**
 * @see Zend_Gdata_Entry
 */
require_once 'Zend/Gdata/Entry.php';

/**
 * @see Zend_Gdata_Extension_FeedLink
 */
require_once 'Zend/Gdata/Extension/FeedLink.php';

/**
 * @see Zend_Gdata_YouTube_Extension_Description
 */
require_once 'Zend/Gdata/YouTube/Extension/Description.php';

/**
 * Represents the YouTube video playlist flavor of an Atom entry
 *
 * @category   Zend
 * @package    Zend_Gdata
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Gdata_YouTube_PlaylistListEntry extends Zend_Gdata_Entry
{

    protected $_entryClassName = 'Zend_Gdata_YouTube_PlaylistListEntry';

    /**
     * Nested feed links
     *
     * @var array
     */
    protected $_feedLink = array();

    /**
     * Description of this playlist
     *
     * @var string
     */
    protected $_description = null;

    /**
     * Creates a Playlist list entry, representing an individual playlist
     * in a list of playlists, usually associated with an individual user.
     *
     * @param DOMElement $element (optional) DOMElement from which this
     *          object should be constructed.
     */
    public function __construct($element = null)
    {
        foreach (Zend_Gdata_YouTube::$namespaces as $nsPrefix => $nsUri) {
            $this->registerNamespace($nsPrefix, $nsUri); 
        }
        parent::__construct($element);
    }

    /**
     * Retrieves a DOMElement which corresponds to this element and all 
     * child properties.  This is used to build an entry back into a DOM
     * and eventually XML text for sending to the server upon updates, or
     * for application storage/persistence.   
     *
     * @param DOMDocument $doc The DOMDocument used to construct DOMElements
     * @return DOMElement The DOMElement representing this element and all 
     * child properties. 
     */
    public function getDOM($doc = null)
    {
        $element = parent::getDOM($doc);
        if ($this->_description != null) {
            $element->appendChild($this->_description->getDOM($element->ownerDocument));
        }
        if ($this->_feedLink != null) {
            foreach ($this->_feedLink as $feedLink) {
                $element->appendChild($feedLink->getDOM($element->ownerDocument));
            }
        }
        return $element;
    }

    /**
     * Creates individual Entry objects of the appropriate type and
     * stores them in the $_entry array based upon DOM data.
     *
     * @param DOMNode $child The DOMNode to process
     */
    protected function takeChildFromDOM($child)
    {
        $absoluteNodeName = $child->namespaceURI . ':' . $child->localName;
        switch ($absoluteNodeName) {
        case $this->lookupNamespace('yt') . ':' . 'description':
            $description = new Zend_Gdata_YouTube_Extension_Description();
            $description->transferFromDOM($child);
            $this->_description = $description;
            break;
        case $this->lookupNamespace('gd') . ':' . 'feedLink':
            $feedLink = new Zend_Gdata_Extension_FeedLink();
            $feedLink->transferFromDOM($child);
            $this->_feedLink[] = $feedLink;
            break;
        default:
            parent::takeChildFromDOM($child);
            break;
        }
    }

    /**
     * Sets the description relating to the playlist.
     *
     * @param Zend_Gdata_YouTube_Extension_Description $description The description relating to the video
     * @return Zend_Gdata_YouTube_PlaylistListEntry Provides a fluent interface
     */ 
    public function setDescription($description = null) 
    {
        $this->_description = $description;
        return $this;
    } 

    /**
     * Returns the description relating to the video.
     *
     * @return Zend_Gdata_YouTube_Extension_Description  The description relating to the video 
     */
    public function getDescription()
    {
        return $this->_description;
    }

    /**
     * Sets the array of embedded feeds related to the video
     *
     * @param array $feedLink The array of embedded feeds relating to the video
     * @return Zend_Gdata_YouTube_PlaylistListEntry Provides a fluent interface
     */
    public function setFeedLink($feedLink = null)
    {
        $this->_feedLink = $feedLink;
        return $this;
    }

    /**
     * Get the feed link property for this entry.
     *
     * @see setFeedLink
     * @param string $rel (optional) The rel value of the link to be found.
     *          If null, the array of links is returned.
     * @return mixed If $rel is specified, a Zend_Gdata_Extension_FeedLink
     *          object corresponding to the requested rel value is returned
     *          if found, or null if the requested value is not found. If
     *          $rel is null or not specified, an array of all available
     *          feed links for this entry is returned, or null if no feed
     *          links are set.
     */
    public function getFeedLink($rel = null)
    {
        if ($rel == null) {
            return $this->_feedLink;
        } else {
            foreach ($this->_feedLink as $feedLink) {
                if ($feedLink->rel == $rel) {
                    return $feedLink;
                }
            }
            return null;
        }
    }

    /**
     * Returns the URL of the playlist video feed
     *
     * @return string The URL of the playlist video feed
     */
    public function getPlaylistVideoFeedUrl()
    {
        return $this->getFeedLink(Zend_Gdata_YouTube::PLAYLIST_REL)->href;
    }

}