/**
    * This file Copyright (c) 2014-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.ui.framework.task;
  
  import info.magnolia.cms.security.User;
  import info.magnolia.context.Context;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.context.SimpleContext;
  import info.magnolia.context.SystemContext;
  import info.magnolia.event.EventBus;
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.task.event.TaskEvent;
  import info.magnolia.ui.api.event.AdmincentralEventBus;
  
  import java.util.Locale;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  
  import com.vaadin.server.VaadinSession;
  import com.vaadin.ui.UI;
  
  /**
   * Dispatches Task events on an {@link EventBus} for a certain user.
   */
  public class LocalTaskDispatcher implements TaskEventDispatcher {
  
      private final User user;
      private final Locale locale;
      private final UI ui;
      private EventBus eventBus;
      private ComponentProvider componentProvider;
  
      @Inject
      public LocalTaskDispatcher(@Named(AdmincentralEventBus.NAME) final EventBus eventBus, UI ui, Context context, ComponentProvider componentProvider) {
          this.eventBus = eventBus;
          this.componentProvider = componentProvider;
          this.user = context.getUser();
          this.locale = context.getLocale();
          this.ui = ui;
      }
  
      /**
       * @deprecated since 5.5.5 - use {@link #LocalTaskDispatcher(EventBus, UI, Context, ComponentProvider)} instead.
       */
      @Deprecated
      public LocalTaskDispatcher(final EventBus eventBus, VaadinSession vaadinSession, Context context, ComponentProvider componentProvider) {
          this(eventBus, UI.getCurrent(), context, componentProvider);
      }
  
      @Override
      public void onTaskEvent(final TaskEvent taskEvent) {
          if (!ui.isAttached()) {
              return;
          }
  
          ui.access(() -> {
              boolean hasContext = MgnlContext.hasInstance();
              if (!hasContext) {
                  MgnlContext.setInstance(new SimpleContext(componentProvider.getComponent(SystemContext.class)) {
                      @Override
                      public User getUser() {
                          return LocalTaskDispatcher.this.user;
                      }
  
                      @Override
                      public Locale getLocale() {
                          return LocalTaskDispatcher.this.locale;
                     }
                 });
             }
             try {
                 eventBus.fireEvent(taskEvent);
             } catch (Exception ignore) {
             } finally {
                 if (!hasContext) {
                     MgnlContext.setInstance(null);
                 }
             }
         });
     }
 }