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/**

* Copyright (C) 2017 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.vaadin.view;

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

import org.springframework.beans.factory.config.ConfigurableBeanFactory;

import org.springframework.context.annotation.Scope;

import org.vaadin.spring.events.EventBus;

import com.vaadin.navigator.Navigator;

import com.vaadin.navigator.View;

import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;

import com.vaadin.spring.annotation.SpringComponent;

import com.vaadin.ui.Alignment;

import com.vaadin.ui.Label;

import com.vaadin.ui.VerticalLayout;

import com.vaadin.ui.themes.ValoTheme;

import eu.etaxonomy.cdm.service.UserHelperAccess;

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

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

/**

 * A {@link SpringViewProvider.setAccessDeniedViewClass(Class<? extends View> accessDeniedViewClass) accessDeniedViewClass}

 * can not be a view- or UI-scoped bean, since the view context is not set up at the time when the <code>accessDeniedViewClass</code>

 * is needed. Therefore the <code>RedirectToLoginView</code> is a scoped prototype bean which always available. Using the 'singleton'

 * scope should also work but is not a good idea for a login view.

 * The <code>RedirectToLoginView</code> redirects the request to the LoginView which then is in a correctly

 * set up view scope.

 *

 * @author a.kohlbecker

 * @since Jul 13, 2017

 *

 */

@SpringComponent

@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)

public class RedirectToLoginView extends VerticalLayout implements View {

    private static final long serialVersionUID = -8763747518841365925L;

    @Autowired

    NavigationManager navigationManager;

    @Autowired

    protected EventBus.UIEventBus uiEventBus;

    public RedirectToLoginView() {

        this.setWidth("100%");

        Label header = new Label("Access to this content is restricted");

        header.setStyleName(ValoTheme.LABEL_FAILURE);

        header.setWidthUndefined();

        addComponent(header);

        setComponentAlignment(header, Alignment.MIDDLE_CENTER);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void enter(ViewChangeEvent event) {

        if(!UserHelperAccess.userHelper().userIsAutheticated()){

            String currentState = ((Navigator)navigationManager).getState();

            // redirect to the login view and pass over the current state

            uiEventBus.publish(this, new NavigationEvent(LoginViewBean.NAME, currentState));

        }

    }

}