/**
   * Returns existing chat rooms for the given <tt>chatRoomProvider</tt>.
   *
   * @param chatRoomProvider the <tt>ChatRoomProviderWrapper</tt>, which chat rooms we're looking
   *     for
   * @return existing chat rooms for the given <tt>chatRoomProvider</tt>
   */
  public List<String> getExistingChatRooms(ChatRoomProviderWrapper chatRoomProvider) {
    if (chatRoomProvider == null) return null;

    ProtocolProviderService protocolProvider = chatRoomProvider.getProtocolProvider();

    if (protocolProvider == null) return null;

    OperationSetMultiUserChat groupChatOpSet =
        protocolProvider.getOperationSet(OperationSetMultiUserChat.class);

    if (groupChatOpSet == null) return null;

    List<String> chatRooms = null;
    try {
      chatRooms = groupChatOpSet.getExistingChatRooms();
    } catch (OperationFailedException e) {
      if (logger.isTraceEnabled())
        logger.trace(
            "Failed to obtain existing chat rooms for server: "
                + protocolProvider.getAccountID().getService(),
            e);
    } catch (OperationNotSupportedException e) {
      if (logger.isTraceEnabled())
        logger.trace(
            "Failed to obtain existing chat rooms for server: "
                + protocolProvider.getAccountID().getService(),
            e);
    }

    return chatRooms;
  }
  /**
   * Returns default nickname for chat room based on the given provider.
   *
   * @param pps the given protocol provider service
   * @return default nickname for chat room based on the given provider.
   */
  public String getDefaultNickname(ProtocolProviderService pps) {
    final OperationSetServerStoredAccountInfo accountInfoOpSet =
        pps.getOperationSet(OperationSetServerStoredAccountInfo.class);

    String displayName = "";
    if (accountInfoOpSet != null) {
      displayName = AccountInfoUtils.getDisplayName(accountInfoOpSet);
    }

    if (displayName == null || displayName.length() == 0) {
      displayName = MUCActivator.getGlobalDisplayDetailsService().getGlobalDisplayName();
      if (displayName == null || displayName.length() == 0) {
        displayName = pps.getAccountID().getUserID();
        if (displayName != null) {
          int atIndex = displayName.lastIndexOf("@");
          if (atIndex > 0) displayName = displayName.substring(0, atIndex);
        }
      }
    }

    return displayName;
  }
  /**
   * Creates a chat room, by specifying the chat room name, the parent protocol provider and
   * eventually, the contacts invited to participate in this chat room.
   *
   * @param roomName the name of the room
   * @param protocolProvider the parent protocol provider.
   * @param contacts the contacts invited when creating the chat room.
   * @param reason
   * @param join whether we should join the room after creating it.
   * @param persistent whether the newly created room will be persistent.
   * @param isPrivate whether the room will be private or public.
   * @return the <tt>ChatRoomWrapper</tt> corresponding to the created room
   */
  public ChatRoomWrapper createChatRoom(
      String roomName,
      ProtocolProviderService protocolProvider,
      Collection<String> contacts,
      String reason,
      boolean join,
      boolean persistent,
      boolean isPrivate) {
    ChatRoomWrapper chatRoomWrapper = null;
    OperationSetMultiUserChat groupChatOpSet =
        protocolProvider.getOperationSet(OperationSetMultiUserChat.class);

    // If there's no group chat operation set we have nothing to do here.
    if (groupChatOpSet == null) return null;

    ChatRoom chatRoom = null;
    try {

      HashMap<String, Object> roomProperties = new HashMap<String, Object>();
      roomProperties.put("isPrivate", isPrivate);
      chatRoom = groupChatOpSet.createChatRoom(roomName, roomProperties);

      if (join) {
        chatRoom.join();

        for (String contact : contacts) chatRoom.invite(contact, reason);
      }
    } catch (OperationFailedException ex) {
      logger.error("Failed to create chat room.", ex);

      MUCActivator.getAlertUIService()
          .showAlertDialog(
              MUCActivator.getResources().getI18NString("service.gui.ERROR"),
              MUCActivator.getResources()
                  .getI18NString(
                      "service.gui.CREATE_CHAT_ROOM_ERROR",
                      new String[] {protocolProvider.getProtocolDisplayName()}),
              ex);
    } catch (OperationNotSupportedException ex) {
      logger.error("Failed to create chat room.", ex);

      MUCActivator.getAlertUIService()
          .showAlertDialog(
              MUCActivator.getResources().getI18NString("service.gui.ERROR"),
              MUCActivator.getResources()
                  .getI18NString(
                      "service.gui.CREATE_CHAT_ROOM_ERROR",
                      new String[] {protocolProvider.getProtocolDisplayName()}),
              ex);
    }

    if (chatRoom != null) {
      ChatRoomProviderWrapper parentProvider =
          chatRoomList.findServerWrapperFromProvider(protocolProvider);

      // if there is the same room ids don't add new wrapper as old one
      // maybe already created
      chatRoomWrapper = chatRoomList.findChatRoomWrapperFromChatRoom(chatRoom);

      if (chatRoomWrapper == null) {
        chatRoomWrapper = new ChatRoomWrapperImpl(parentProvider, chatRoom);
        chatRoomWrapper.setPersistent(persistent);
        chatRoomList.addChatRoom(chatRoomWrapper);
      }
    }

    return chatRoomWrapper;
  }