EDIT

package eu.etaxonomy.cdm.vaadin.component.distributionStatus;

import java.io.Serializable;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.DisposableBean;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.vaadin.spring.events.EventBus;

import org.vaadin.spring.events.annotation.EventBusListenerMethod;

import com.vaadin.server.FontAwesome;

import com.vaadin.server.ThemeResource;

import com.vaadin.spring.annotation.SpringComponent;

import com.vaadin.spring.annotation.ViewScope;

import com.vaadin.ui.Alignment;

import com.vaadin.ui.Button;

import com.vaadin.ui.HorizontalLayout;

import eu.etaxonomy.cdm.api.application.CdmRepository;

import eu.etaxonomy.cdm.api.util.UserHelper;

import eu.etaxonomy.cdm.i18n.Messages;

import eu.etaxonomy.cdm.vaadin.event.AuthenticationSuccessEvent;

import eu.etaxonomy.vaadin.ui.navigation.NavigationEvent;

import eu.etaxonomy.vaadin.ui.navigation.NavigationManager;

/**

 * A toolbar for the distribution app. Displayed at the top of the screen.

 */

@SpringComponent("distributionToolbar")

@ViewScope

public class DistributionToolbar extends HorizontalLayout implements Serializable, DisposableBean{

	/**

	 * automatically generated ID

	 */

	private static final long serialVersionUID = 5344340511582993289L;

    private EventBus.UIEventBus uiEventBus;

    @Autowired

    private final void setViewEventBus(EventBus.UIEventBus viewEventBus){

        this.uiEventBus = viewEventBus;

        viewEventBus.subscribe(AuthenticationSuccessEvent.class); // FIXME shouldn't this be .subscribe(this) ??

    }

    @Autowired

    @Qualifier("cdmRepository")

    private CdmRepository repo;

    @Autowired

    private NavigationManager navigationManager;

    @Autowired

    private UserHelper userHelper;

    private final Button loginButton = new Button(Messages.getLocalizedString(Messages.DistributionToolbar_LOGIN));

    private final Button logoutButton = new Button(Messages.getLocalizedString(Messages.DistributionToolbar_LOGOUT));

    private final Button userButton = new Button(FontAwesome.USER);

	private final Button editButton = new Button(Messages.getLocalizedString(Messages.DistributionToolbar_EDIT));

	private final Button saveButton = new Button(Messages.getLocalizedString(Messages.DistributionToolbar_SAVE));

	private final Button detailButton = new Button(Messages.getLocalizedString(Messages.DistributionToolbar_DETAIL));

	private final Button distributionSettingsButton =  new Button(Messages.getLocalizedString(Messages.DistributionToolbar_AREAS_AND_TAXA));

	private final Button settingsButton =  new Button(Messages.getLocalizedString(Messages.DistributionToolbar_STATUS));

	private final Button helpButton =  new Button(Messages.getLocalizedString(Messages.DistributionToolbar_HELP));

//	private final Authentication authentication;

//	private ExcelExporter exporter = new ExcelExporter();

	/**

	 * Constructs the toolbar.

	 */

	@PostConstruct

    public void init() {

		setMargin(true);

		setSpacing(true);

		setStyleName("toolbar"); //$NON-NLS-1$

		setWidth("100%"); //$NON-NLS-1$

		setHeight("75px"); //$NON-NLS-1$

//		exporter.setCaption("Export");

//		exporter.setIcon(new ThemeResource("icons/32/document-xsl.png"));

		loginButton.addClickListener(e -> performLogin());

		logoutButton.addClickListener(e -> performLogout());

		saveButton.setIcon(new ThemeResource("icons/32/document-save.png")); //$NON-NLS-1$

		editButton.setIcon(new ThemeResource("icons/32/document-edit.png")); //$NON-NLS-1$

		detailButton.setIcon(new ThemeResource("icons/32/document-txt.png")); //$NON-NLS-1$

		settingsButton.setIcon(new ThemeResource("icons/32/settings_1.png")); //$NON-NLS-1$

		distributionSettingsButton.setIcon(new ThemeResource("icons/32/settings_1.png")); //$NON-NLS-1$

        HorizontalLayout leftLayout = new HorizontalLayout();

        leftLayout.addComponent(distributionSettingsButton);

        leftLayout.addComponent(settingsButton);

        leftLayout.addComponent(detailButton);

		HorizontalLayout rightLayout = new HorizontalLayout();

		rightLayout.addComponent(helpButton);

		rightLayout.addComponent(loginButton);

		rightLayout.addComponent(logoutButton);

        rightLayout.addComponent(userButton);

        addComponent(leftLayout);

        setComponentAlignment(leftLayout, Alignment.MIDDLE_LEFT);

		addComponent(rightLayout);

		setComponentAlignment(rightLayout, Alignment.MIDDLE_RIGHT);

		setExpandRatio(rightLayout, 1);

		updateAuthenticationButtons();

    }

	/**

	 * Called when authentication was successful. Updates the user menu buttons.

	 * @param event

	 */

	@EventBusListenerMethod

    public void onAuthenticationSuccessEvent(org.vaadin.spring.events.Event<AuthenticationSuccessEvent> event){

        boolean isInitialized = userButton != null;

        // The RegistrationToolbar is being initialize even if not needed only because it is a EventListener

        // which causes Spring to initialize it.

        // TODO After switching to an other event bus this check can be removed

        if(isInitialized){

            updateAuthenticationButtons();

        }

    }

	/**

	 * Updates the user menu buttons on login and logout.

	 */

    protected void updateAuthenticationButtons() {

        if(userHelper.userIsAutheticated() && !userHelper.userIsAnnonymous()){

            userButton.setCaption(userHelper.userName());

            userButton.setVisible(true);

            logoutButton.setVisible(true);

            loginButton.setVisible(false);

            saveButton.setVisible(true);

            editButton.setVisible(true);

            detailButton.setVisible(true);

            settingsButton.setVisible(true);

            distributionSettingsButton.setVisible(true);

        } else {

            userButton.setCaption(null);

            userButton.setVisible(false);

            logoutButton.setVisible(false);

            loginButton.setVisible(true);

            saveButton.setVisible(false);

            editButton.setVisible(false);

            detailButton.setVisible(false);

            settingsButton.setVisible(false);

            distributionSettingsButton.setVisible(false);

        }

    }

    /**

     * @return

     */

    private void performLogin() {

        uiEventBus.publish(this, new NavigationEvent("login", navigationManager.getCurrentViewName())); //$NON-NLS-1$

    }

    /**

     * Logs the user out and closes the session.

     */

    private void performLogout() {

        userHelper.logout();

        updateAuthenticationButtons();

        navigationManager.reloadCurrentView();

    }

    /**

     * The settings button.

     * @return

     */

    public Button getSettingsButton(){

        return settingsButton;

    }

    /**

     * Button to open the {@link DistributionStatusSettingsConfigWindow}.

     * @return Button to display the {@link DistributionStatusSettingsConfigWindow}.

     */

    public Button getDistributionSettingsButton() {

		return distributionSettingsButton;

	}

    /**

     * Unused.

     * @return

     */

	public Button getEditButton() {

		return editButton;

	}

	/**

	 * Unused.

	 * @return

	 */

	public Button getSaveButton() {

		return saveButton;

	}

	/**

	 * Button to open the {@link DetailWindow}.

	 * @return  Button to open the {@link DetailWindow}.

	 */

	public Button getDetailButton() {

		return detailButton;

	}

	/**

	 * Button to open the {@link HelpWindow}.

	 * @return Button to open the {@link HelpWindow}.

	 */

	public Button getHelpButton() {

		return helpButton;

	}

    /**

     * {@inheritDoc}

     */

    @Override

    public void destroy() throws Exception {

        uiEventBus.unsubscribe(this);

    }

}