This is my code, but it does not seem to work

function fep_cus_user_reply_comment_message($comment_ID) {
	global $wpdb;
	$comment = get_comment($comment_ID);
  $comment_author_email = trim($comment->comment_author_email);
  $parent_id = $comment->comment_parent ? $comment->comment_parent : '';
	$author_name = get_userdata($comment->user_id)->display_name;	
	$notify = $parent_id ? get_comment($parent_id)->comment_mail_notify : '0';
	$spam_confirmed = $comment->comment_approved;
	
	if ($parent_id != '' && $spam_confirmed != 'spam' && $notify == '1') {
    $wp_email = 'no-reply@' . preg_replace('#^www.#', '', strtolower($_SERVER['SERVER_NAME']));
    $author_id = get_comment($parent_id)->user_id;
		
    if ($post->post_type !== 'works')//How to judge here? ? ?
                return;
    if ( ! function_exists( 'fep_send_message' ) )
                return;
        // Prepare message data
        $message = array(
             'message_title' => 'title', //change with message title
             'message_content' => 'content', //change with message content
             'message_to_id' => $author_id
        );
        $override = array(
             'post_author' => 1, //change with message sender id
        );
        // Send message
       fep_send_message( $message, $override );    
		
  }
}	
add_action( 'comment_post', 'fep_cus_user_reply_comment_message' );