/** * Remove User from Room * @param inbound */
    public static void removeUserinroom(String aRoomID,WebSocket conn) {
        // 把離開的邏輯坐在這裡
        // 1. 若是Client離開 -> 則把所有人都踢出此room
        // 2. 若是Agent離開 && 剩餘人數 > 1 -> 自己退出就好
        // 3. 若是Agent離開 && 剩餘人數 == 1 -> 則把所有人都踢出此room
        System.out.println("removeUserinroom(String room,WebSocket conn) called");
        Map<WebSocket, RoomInfo> roommap = roomuserconnections.get(aRoomID);
//      Set<WebSocket> memberConns = roommap.keySet();
        Set<WebSocket> tmpMemberConns = new HashSet(roommap.keySet());
        JSONObject sendJson = new JSONObject();
        sendJson.put("Event", "removeUserinroom");
        sendJson.put("roomID", aRoomID);




        if (roommap != null && roommap.containsKey(conn)) {
//          System.out.println(conn + "'s room is " + " removed");
            String currACType = WebSocketUserPool.getACTypeByKey(conn);
            System.out.println("ACType: " + WebSocketUserPool.getACTypeByKey(conn));

            /** 清除room相關資料 **/
            if ("Client".equals(currACType)){
                System.out.println("Client 全清");
                //全清:
                for (WebSocket memberConn: tmpMemberConns){
                    WebSocketUserPool.removeUserRoom(memberConn);
                }
                roommap.clear();
                sendJson.put("result", WebSocketUserPool.getUserNameByKey(conn) + " closed the room" + aRoomID);
            // 之後可將一二條件式合併:
            }else if (roommap.size() == 2){
                System.out.println("roommap.size() == 2 全清");
                //也全清:
                for (WebSocket memberConn: tmpMemberConns){
                    WebSocketUserPool.removeUserRoom(memberConn);
                }
                roommap.clear();
                sendJson.put("result", WebSocketUserPool.getUserNameByKey(conn) + " closed the room" + aRoomID);
            }else if (roommap.size() > 2){
                System.out.println("roommap.size() > 2  清自己");
                //清Agent自己
                WebSocketUserPool.removeUserRoom(conn);
                roommap.remove(conn);
                sendJson.put("result", WebSocketUserPool.getUserNameByKey(conn) + " left the room" + aRoomID);
            }
            System.out.println("roomId: " + aRoomID + " size: " + roommap.size());
            sendJson.put("roomMembers", WebSocketRoomPool.getOnlineUserinroom(aRoomID).toString());


            /** 告知所有成員有人離開room,請更新前端頁面 **/
            for (WebSocket memberConn: tmpMemberConns){
                // 若是Logout()觸發的,則跳過
                if (memberConn.isClosed() || memberConn.isClosing()){
                    continue;
                }
                WebSocketUserPool.sendMessageToUser(memberConn, sendJson.toString());
            }
        }
    }