<?php

/* 
 * Copyright (C) 2008 Anis uddin Ahmad <anisniit@gmail.com>
 * Copyright (C) 2010-2012 Michael Bemmerl <mail@mx-server.de>
 *
 * This file is part of the "Universal Feed Writer" project.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
* 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

 /**
 * Universal Feed Writer
 * 
 * FeedItem class - Used as feed element in FeedWriter class
 *
 * @package         UniversalFeedWriter
 * @author          Anis uddin Ahmad <anisniit@gmail.com>
 * @link            http://www.ajaxray.com/projects/rss
 */
class FeedItem
{
	private $elements = array();    //Collection of feed elements
	private $version;
	
	/**
	* Constructor
	* 
	* @param    contant     (RSS1/RSS2/ATOM) RSS2 is default.
	*/ 
	function __construct($version = RSS2)
	{
		$this->version = $version;
	}
	
	/**
	* Add an element to elements array
	* 
	* @access   public
	* @param    string  The tag name of an element
	* @param    string  The content of tag
	* @param    array   Attributes(if any) in 'attrName' => 'attrValue' format
	* @param    boolean Specifies, if an already existing element is overwritten.
	* @return   void
	*/
	public function addElement($elementName, $content, $attributes = null, $overwrite = FALSE)
	{
		// return if element already exists & if overwriting is disabled.
		if (isset($this->elements[$elementName]) && !$overwrite)
			return;

		$this->elements[$elementName]['name']       = $elementName;
		$this->elements[$elementName]['content']    = $content;
		$this->elements[$elementName]['attributes'] = $attributes;
	}
	
	/**
	* Set multiple feed elements from an array.
	* Elements which have attributes cannot be added by this method
	* 
	* @access   public
	* @param    array   array of elements in 'tagName' => 'tagContent' format.
	* @return   void
	*/
	public function addElementArray($elementArray)
	{
		if (!is_array($elementArray))
			return;

		foreach ($elementArray as $elementName => $content)
		{
			$this->addElement($elementName, $content);
		}
	}
	
	/**
	* Return the collection of elements in this feed item
	* 
	* @access   public
	* @return   array
	*/
	public function getElements()
	{
		return $this->elements;
	}

	/**
	* Return the type of this feed item
	* 
	* @access   public
	* @return   string  The feed type, as defined in FeedWriter.php
	*/
	public function getVersion()
	{
		return $this->version;
	}
	
	// Wrapper functions ------------------------------------------------------
	
	/**
	* Set the 'dscription' element of feed item
	* 
	* @access   public
	* @param    string  The content of 'description' or 'summary' element
	* @return   void
	*/
	public function setDescription($description)
	{
		$tag = ($this->version == ATOM) ? 'summary' : 'description';
		$this->addElement($tag, $description);
	}
	
	/**
	* @desc     Set the 'title' element of feed item
	* @access   public
	* @param    string  The content of 'title' element
	* @return   void
	*/
	public function setTitle($title)
	{
		$this->addElement('title', $title);
	}
	
	/**
	* @desc     Set the 'guid' element of feed item
	* @access   public
	* @param    string  The content of 'guid' element
	* @return   void
	*/
	public function setGuid($link)
	{
		$this->addElement('guid', $link);
	}
	
	/**
	* Set the 'date' element of feed item
	* 
	* @access   public
	* @param    string  The content of 'date' element
	* @return   void
	*/
	public function setDate($date)
	{
		if(!is_numeric($date))
		{
			if ($date instanceof DateTime)
			{
				if (version_compare(PHP_VERSION, '5.3.0', '>='))
					$date = $date->getTimestamp();
				else
					$date = strtotime($date->format('r'));
			}
			else
				$date = strtotime($date);
		}
		
		if($this->version == ATOM)
		{
			$tag    = 'updated';
			$value  = date(DATE_ATOM, $date);
		}
		elseif($this->version == RSS2)
		{
			$tag    = 'pubDate';
			$value  = date(DATE_RSS, $date);
		}
		else
		{
			$tag    = 'dc:date';
			$value  = date("Y-m-d", $date);
		}
		
		$this->addElement($tag, $value);
	}
	
	/**
	* Set the 'link' element of feed item
	* 
	* @access   public
	* @param    string  The content of 'link' element
	* @return   void
	*/
	public function setLink($link)
	{
		if($this->version == RSS2 || $this->version == RSS1)
		{
			$this->addElement('link', $link);
		}
		else
		{
			$this->addElement('link','',array('href'=>$link));
			$this->addElement('id', FeedWriter::uuid($link,'urn:uuid:'));
		}
	}
	
	/**
	* Set the 'encloser' element of feed item
	* For RSS 2.0 only
	* 
	* @access   public
	* @param    string  The url attribute of encloser tag
	* @param    string  The length attribute of encloser tag
	* @param    string  The type attribute of encloser tag
	* @return   void
	*/
	public function setEncloser($url, $length, $type)
	{
		if ($this->version != RSS2)
			return;

		$attributes = array('url'=>$url, 'length'=>$length, 'type'=>$type);
		$this->addElement('enclosure','',$attributes);
	}

	/**
	* Set the 'author' element of feed item
	* For ATOM only
	* 
	* @access   public
	* @param    string  The author of this item
	* @return   void
	*/
	public function setAuthor($author)
	{
		if ($this->version != ATOM)
			return;

		$this->addElement('author', '<name>' . $author . '</name>');
	}

	/**
	* Set the unique identifier of the feed item
	* 
	* @access   public
	* @param    string  The unique identifier of this item
	* @return   void
	*/
	public function setId($id)
	{
		if ($this->version == RSS2)
		{
			$this->addElement('guid', $id, array('isPermaLink' => 'false'));
		}
		else if ($this->version == ATOM)
		{
			$this->addElement('id', FeedWriter::uuid($id,'urn:uuid:'), NULL, TRUE);
		}
	}
	
 } // end of class FeedItem
