/**
   * Loads the tooltip with the data for current metacontact.
   *
   * @param tip the tooltip to fill.
   */
  private void loadTooltip(final ExtendedTooltip tip) {
    Iterator<Contact> i = metaContact.getContacts();

    ContactPhoneUtil contactPhoneUtil = ContactPhoneUtil.getPhoneUtil(metaContact);

    String statusMessage = null;
    Contact protocolContact;
    boolean isLoading = false;
    while (i.hasNext()) {
      protocolContact = i.next();

      // Set the first found status message.
      if (statusMessage == null
          && protocolContact.getStatusMessage() != null
          && protocolContact.getStatusMessage().length() > 0)
        statusMessage = protocolContact.getStatusMessage();

      if (ConfigurationUtils.isHideAccountStatusSelectorsEnabled()) break;

      ImageIcon protocolStatusIcon =
          ImageLoader.getIndexedProtocolIcon(
              ImageUtils.getBytesInImage(protocolContact.getPresenceStatus().getStatusIcon()),
              protocolContact.getProtocolProvider());

      String contactAddress = protocolContact.getAddress();
      // String statusMessage = protocolContact.getStatusMessage();

      tip.addLine(protocolStatusIcon, contactAddress);

      addContactResourceTooltipLines(tip, protocolContact);

      if (!protocolContact.getProtocolProvider().isRegistered()) continue;

      contactPhoneUtil.addDetailsResponseListener(
          protocolContact,
          new OperationSetServerStoredContactInfo.DetailsResponseListener() {
            public void detailsRetrieved(final Iterator<GenericDetail> details) {
              if (!SwingUtilities.isEventDispatchThread()) {
                SwingUtilities.invokeLater(
                    new Runnable() {
                      public void run() {
                        detailsRetrieved(details);
                      }
                    });
                return;
              }

              // remove previously shown information
              // as it contains "Loading..." text
              tip.removeAllLines();

              // load it again
              loadTooltip(tip);
            }
          });

      List<String> phones = contactPhoneUtil.getPhones(protocolContact);

      if (phones != null) {
        addPhoneTooltipLines(tip, phones.iterator());
      } else isLoading = true;
    }

    if (isLoading)
      tip.addLine(null, GuiActivator.getResources().getI18NString("service.gui.LOADING"));

    if (statusMessage != null) tip.setBottomText(statusMessage);
  }
  /**
   * Initializes buttons panel.
   *
   * @param uiContact the <tt>UIContact</tt> for which we initialize the button panel
   */
  private void initButtonsPanel(UIContact uiContact) {
    this.remove(chatButton);
    this.remove(callButton);
    this.remove(callVideoButton);
    this.remove(desktopSharingButton);
    this.remove(addContactButton);

    clearCustomActionButtons();

    if (!isSelected) return;

    UIContactDetail imContact = null;
    // For now we support instance messaging only for contacts in our
    // contact list until it's implemented for external source contacts.
    if (uiContact.getDescriptor() instanceof MetaContact)
      imContact = uiContact.getDefaultContactDetail(OperationSetBasicInstantMessaging.class);

    int x = (statusIcon == null ? 0 : statusIcon.getIconWidth()) + LEFT_BORDER + H_GAP;

    // Re-initialize the x grid.
    constraints.gridx = 0;
    int gridX = 0;

    if (imContact != null) {
      x += addButton(chatButton, ++gridX, x, false);
    }

    UIContactDetail telephonyContact =
        uiContact.getDefaultContactDetail(OperationSetBasicTelephony.class);

    // Check if contact has additional phone numbers, if yes show the
    // call button
    ContactPhoneUtil contactPhoneUtil = null;

    // check for phone stored in contact info only
    // if telephony contact is missing
    if (uiContact.getDescriptor() != null
        && uiContact.getDescriptor() instanceof MetaContact
        && telephonyContact == null) {
      contactPhoneUtil = ContactPhoneUtil.getPhoneUtil((MetaContact) uiContact.getDescriptor());

      MetaContact metaContact = (MetaContact) uiContact.getDescriptor();
      Iterator<Contact> contacts = metaContact.getContacts();

      while (contacts.hasNext()) // && !hasPhone)
      {
        Contact contact = contacts.next();

        if (!contact.getProtocolProvider().isRegistered()) continue;

        contactPhoneUtil.addDetailsResponseListener(
            contact, new DetailsListener(treeNode, callButton, uiContact));
      }
    }

    // for SourceContact in history that do not support telephony, we
    // show the button but disabled
    List<ProtocolProviderService> providers =
        AccountUtils.getOpSetRegisteredProviders(OperationSetBasicTelephony.class, null, null);

    if ((telephonyContact != null && telephonyContact.getAddress() != null)
        || (contactPhoneUtil != null && contactPhoneUtil.isCallEnabled() && providers.size() > 0)) {
      x += addButton(callButton, ++gridX, x, false);
    }

    UIContactDetail videoContact =
        uiContact.getDefaultContactDetail(OperationSetVideoTelephony.class);

    if (videoContact != null
        || (contactPhoneUtil != null && contactPhoneUtil.isVideoCallEnabled())) {
      x += addButton(callVideoButton, ++gridX, x, false);
    }

    UIContactDetail desktopContact =
        uiContact.getDefaultContactDetail(OperationSetDesktopSharingServer.class);

    if (desktopContact != null
        || (contactPhoneUtil != null && contactPhoneUtil.isDesktopSharingEnabled())) {
      x += addButton(desktopSharingButton, ++gridX, x, false);
    }

    // enable add contact button if contact source has indicated
    // that this is possible
    if (uiContact.getDescriptor() instanceof SourceContact
        && uiContact.getDefaultContactDetail(OperationSetPersistentPresence.class) != null
        && AccountUtils.getOpSetRegisteredProviders(
                    OperationSetPersistentPresence.class, null, null)
                .size()
            > 0
        && !ConfigurationUtils.isAddContactDisabled()) {
      x += addButton(addContactButton, ++gridX, x, false);
    }

    // The list of the contact actions
    // we will create a button for every action
    Collection<SIPCommButton> contactActions = uiContact.getContactCustomActionButtons();

    int lastGridX = gridX;
    if (contactActions != null && contactActions.size() > 0) {
      lastGridX = initContactActionButtons(contactActions, gridX, x);
    } else {
      addLabels(gridX);
    }

    if (lastAddedButton != null) setButtonBg(lastAddedButton, lastGridX, true);

    this.setBounds(0, 0, treeContactList.getWidth(), getPreferredSize().height);
  }