<?php
class TwitterFeed extends DataObject {

/**
* Your Twitter ID
*
* @var integer
* @access public
*/
public $twitterId = 19296617;

/**
* Remove your name from posts
* Set to false to not remove your name, otherwise set to your name
*
* @var mixed
* @access public
*/
public $twitterName = 'syrupnyc';

/**
* Show replies to people
*
* @var boolean
* @access public
*/
public $showReplies = false;

/**
* Twitter RSS URL
*
* @var string
* @access public
*/
public $rssUrl = 'http://twitter.com/statuses/user_timeline/:twitterId.rss';

/**
* Turn off table usage
*
* @var string
* @access public
*/
public $useTable = false;

/**
* Duration of cache
*
* @var string
* @access public
*/
public $cacheDuration = 300;

public $cacheKey = 'TwitterData';
/**
* Find Twitters
*
* @param array $options Options when getting twits, as followed:
* - cache: Force caching on or off
* - limit: Limit number of records returned
* @access public
* @return array
*/
public function find($options = array()) {
//Get twits
$cache = SS_Cache::factory('TwitterCache', 'Output', array('lifetime' => $this->cacheDuration, 'automatic_serialization' => true));
if( (isset($options['cache']) && $options['cache'] == false) || ($twits = $cache->load($this->cacheKey)) === false) {
$twits = $this->_getTwits();
$cache->save($twits, $this->cacheKey);
}
//Set to limit
if(isset($options['limit']) && count($twits) > $options['limit'])
{
$twits = array_slice($twits, 0, $options['limit']);
}

return $twits;
}

/**
* Get Twitter Lines
*
* @access private
* @return array
*/
private function _getTwits()
{
//Get feed
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, str_replace(':twitterId', $this->twitterId, $this->rssUrl));
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$feed = curl_exec($ch);
curl_close($ch);

if(!$feed) { return false; }

$xml = new SimpleXmlElement($feed);

foreach($xml->channel->item as $item)
{
//
$title = (string)$item->title;

//Skip if it's a reply
if(!$this->showReplies && preg_match('/^'.$this->twitterName.': @/',$title))
continue;

//Remove name
if($this->twitterName)
$title = trim(preg_replace('/^'.$this->twitterName.':/','',$title));

$out[] = array(
'TweetTitle' => $this->_parse_twitter($title),
'TweetDescription' => (string)$item->description,
'TweetPubDate' => $this->_timeAgo(strtotime($item->pubDate), 1),
'TweetLink' => (string)$item->link
);
}

return $out;
}

private function _timeAgo($timestamp, $granularity=2, $format='Y-m-d H:i:s'){
$difference = time() - $timestamp;
if($difference < 0) return '0 seconds ago';
elseif($difference < 864000){
$periods = array('week' => 604800,'day' => 86400,'hr' => 3600,'min' => 60,'sec' => 1);
$output = '';
foreach($periods as $key => $value){
if($difference >= $value){
$time = round($difference / $value);
$difference %= $value;
$output .= ($output ? ' ' : '').$time.' ';
$output .= (($time > 1 && $key == 'day') ? $key.'s' : $key);
$granularity--;
}
if($granularity == 0) break;
}
return ($output ? $output : '0 seconds').' ago';
}
else return date($format, $timestamp);
}

private function _parse_twitter($t) {
// link URLs
$t = " ".preg_replace( "/(([[:alnum:]]+:\/\/)|www\.)([^[:space:]]*)".
"([[:alnum:]#?\/&=])/i", "<a href=\"\\1\\3\\4\" target=\"_blank\">".
"\\1\\3\\4</a>", $t);

// link mailtos
$t = preg_replace( "/(([a-z0-9_]|\\-|\\.)+@([^[:space:]]*)".
"([[:alnum:]-]))/i", "<a href=\"mailto:\\1\">\\1</a>", $t);

//link twitter users
$t = preg_replace( "/ +@([a-z0-9_]*) ?/i", " <a href=\"http://twitter.com/\\1\" target=\"_blank\">@\\1</a> ", $t);

//link twitter arguments
$t = preg_replace( "/ +#([a-z0-9_]*) ?/i", " <a href=\"http://twitter.com/search?q=%23\\1\" target=\"_blank\">#\\1</a> ", $t);

// truncates long urls that can cause display problems (optional)
$t = preg_replace("/>(([[:alnum:]]+:\/\/)|www\.)([^[:space:]]".
"{30,40})([^[:space:]]*)([^[:space:]]{10,20})([[:alnum:]#?\/&=])".
"</", ">\\3...\\5\\6<", $t);
return trim($t);
}

}