<?

class TwitterUtils {

  static function updateStatus($user, $pass, $text) {
    return self::post(self::$url_update, $user, $pass, array('status'=>substr($text,0,140), 'source'=>self::$src));
  }

  static function getUpdates($user, $pass, $since_id = '', $count = '') {
    $url = self::$url_status;
    if( $count ) {
      $url .= "?count=$count";
    }
    if( $since_id ) {
      $url .= $count? "&" : "?";
      $url .= "since_id={$since_id}";
    }
    return self::get($url, $user, $pass);
  }

  static function getFollowers($user, $pass, $page = '') {
    $url = self::$url_followers;
    if( $page ) { $url .= "?page=$page"; }
    return self::get($url, $user, $pass);
  }

  static function getReplies($user, $pass, $lastreply = '', $page = '') {
    $url = self::$url_replies;
    if( $lastreply ) { $url .= "?since_id=$lastreply"; }
    if( $page ) { 
      $url .= $lastreply? "&" : "?";
      $url .= "page=$page";
    }    
    return self::get($url, $user, $pass);
  }

  static function getFriends($user, $pass) {
    return self::get(self::$url_friends, $user, $pass);
  }

  static function sendDirectMessage($user, $pass, $friend, $text) {
    $args = array('user'=>$friend, 'text'=>substr($text,0,140));
    return self::post(self::$url_direct_new, $user, $pass, $args);
  }

  static function getDirectMessages($user, $pass, $lastid, $page = '') {
    $url = self::$url_direct_get;
    if( $lastid ) { $url .= "?since_id=$lastid"; }
    if( $page ) { 
      $url .= $lastid? "&" : "?";
      $url .= "page=$page";
    }
    return self::get($url, $user, $pass);
  }

  private function post($url, $user, $pass, $args) {
    $session = curl_init();
    curl_setopt ( $session, CURLOPT_URL, $url );
    curl_setopt ( $session, CURLOPT_HTTPAUTH, CURLAUTH_BASIC );
    curl_setopt ( $session, CURLOPT_HEADER, false );
    curl_setopt ( $session, CURLOPT_REFERER, self::$url_referer );
    curl_setopt ( $session, CURLOPT_USERPWD, $user . ":" . $pass );
    curl_setopt ( $session, CURLOPT_RETURNTRANSFER, 1 );
    curl_setopt ( $session, CURLOPT_POST, 1);
    $args_txt = '';
    foreach($args as $k=>$v) {
      if( $args_txt ) { $args_txt .= "&"; }
      $args_txt .= "$k=".urlencode($v);
    }
    curl_setopt ( $session, CURLOPT_POSTFIELDS, $args_txt);
    $result = curl_exec ( $session );
    curl_close( $session );
    return json_decode($result);
  }

  private static function get($url, $user, $pass) {
    $session = curl_init();
    curl_setopt ( $session, CURLOPT_URL, $url );
    curl_setopt ( $session, CURLOPT_HTTPAUTH, CURLAUTH_BASIC );
    curl_setopt ( $session, CURLOPT_HEADER, false );
    curl_setopt ( $session, CURLOPT_USERPWD, $user . ":" . $pass );
    curl_setopt ( $session, CURLOPT_RETURNTRANSFER, 1 );
    $result = curl_exec ( $session );
    curl_close( $session );
    return json_decode($result);
  }

  private static $url_update = "http://twitter.com/statuses/update.json";
  private static $url_status = "http://twitter.com/statuses/user_timeline.json";
  private static $url_replies = "http://twitter.com/statuses/replies.json";
  private static $url_friends = "http://twitter.com/statuses/friends.json";
  private static $url_followers = "http://twitter.com/statuses/followers.json";
  private static $url_direct_get = "http://twitter.com/direct_messages.json";
  private static $url_direct_new = "http://twitter.com/direct_message/new.json";
  /** @var $url_referer is the botname we registered with twitter -- should not be changed! */
  private static $url_referer = "http://dev.zentrack.net/devbot/";
  private static $src = 'ztdevbot';

}
?>