* Sends SMS via Clickatell api
     *
     * @uses `wedevs_sms_via_clickatell` filter to fire
     *
     * @param type $sms_data
     * @return boolean
     */
    function clickatellAPI( $sms_data ) {
        $response = array(
            'success' => false,
            'message' => wedevs_sms_get_option( 'sms_sent_error' )
        );

        $username = wedevs_sms_get_option( 'clickatell_username' );
        $password = wedevs_sms_get_option( 'clickatell_pass' );
        $api_key = wedevs_sms_get_option( 'clickatell_api' );

        //bail out if nothing provided
        if ( empty( $username ) || empty( $password ) || empty( $api_key ) ) {
            return $response;
        }

        // auth call
        $baseurl = "http://api.clickatell.com";
        $url = sprintf( '%s/http/auth?user=%s&password=%s&api_id=%s', $baseurl, $username, $password, $api_key );

        // do auth call
        $ret = file( $url );

        // explode our response. return string is on first line of the data returned
        $sess = explode( ":", $ret[0] );
        if ( $sess[0] == "OK" ) {

            $sess_id = trim( $sess[1] ); // remove any whitespace
            $url = sprintf( '%s/http/sendmsg?session_id=%s&to=%s&text=%s', $baseurl, $sess_id, $sms_data['to'], $sms_data['text'] );

            // do sendmsg call
            $ret = file( $url );
            $send = explode( ":", $ret[0] );

            if ( $send[0] == "ID" ) {
                $response = array(
                    'success' => true,
                    'code' => $sms_data['code'],
                    'message' => wedevs_sms_get_option( 'sms_sent_msg' )
                );
            }
        }

        return $response;
    }