<?php
/**
* @author      Jan Altensen (Stricted)
* @copyright   2013-2014 Jan Altensen (Stricted)
* @license     GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
*/
class Feed {
	/**
	 * Constructs a new instance of Feed class.
	 *
	 * @param	string	$url
	 * @return	array
	 */
	public function __construct($url) {
		$file = file_get_contents($url);
		$xml = simplexml_load_string($file);
		$type = $this->getFeedType($xml);
		$data = array();
		
		switch($type) {
			case 'rss':
				$data = $this->parseRSSFeed($xml);
				break;
			
			case 'atom':
				$data = $this->parseAtomFeed($xml);
				break;
		}
		
		return $data;  
	}
	
	/**
	 * parse rss feed
	 *
	 * @param	object	$xml
	 * @return	array
	 */
	private function parseRSSFeed($xml) {
		foreach ($xml->channel->item as $item) {
			$item->pubDate = $this->getTime($item->pubDate);
			$item->description = html_entity_decode($item->description);
			$data[] = $item;
		} 
		return $data;
	}
	
	/**
	 * parse rss feed
	 *
	 * @param	object	$xml
	 * @return	array
	 */
	private function parseAtomFeed($xml) {
		$entries = $xml->children()->entry;
		foreach ($entries as $entry) {
			$entry->children()->author = $entry->children()->author->name;
			$entry->children()->link = $entry->link->attributes()->href;
			$entry->children()->updated = $this->getTimeStamp($entry->children()->updated);
			$data[] = $entry->children();
		}
		return $data;
	}
	
	/**
	 * get feed time
	 *
	 * @param	string	$time
	 * @return	integer
	 */
	private function getTime($time) {
		return date("d.m.Y H:i:s", $this->getTimeStamp($time));
	}
	
	/**
	 * get feed timestamp
	 *
	 * @param	string	$time
	 * @return	integer
	 */
	private function getTimeStamp($time) {
		return intval(strtotime($time));
	}
	
	/**
	 * get feed type
	 *
	 * @param	object	$xml
	 * @return	array
	 */
	public static function getFeedType($xml) {
		$type = '';
		if (isset($xml->channel->item)) {
			$type = 'rss';
		}
		else if (isset($xml->entry)) {
			$type = 'atom';
		}

		return $type;
	}
}
?>