/**
    * This file Copyright (c) 2013-2018 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.workbench;
  
  import info.magnolia.event.EventBus;
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.ui.vaadin.integration.contentconnector.ContentConnector;
  import info.magnolia.ui.workbench.event.SelectionChangedEvent;
  
  import java.util.Set;
  
  import javax.inject.Inject;
  
  import org.apache.commons.lang3.ObjectUtils;
  
  import com.vaadin.ui.Alignment;
  import com.vaadin.v7.ui.HorizontalLayout;
  import com.vaadin.v7.ui.Label;
  
  /**
   * The browser features a status bar at the bottom with selected path and item count information.
   */
  public class WorkbenchStatusBarPresenter {
  
      private final StatusBarView view;
  
      private ContentConnector contentConnector;
  
      private EventBus eventBus;
  
      private final Label selectionLabel = new Label();
  
      private ContentPresenter activeContentPresenter;
  
      private boolean rootIsSelected;
  
      private SimpleTranslator i18n;
  
      @Inject
      public WorkbenchStatusBarPresenter(StatusBarView view, ContentConnector contentConnector, SimpleTranslator i18n) {
          this.view = view;
          this.contentConnector = contentConnector;
          this.i18n = i18n;
      }
  
      private void bindHandlers() {
          eventBus.addHandler(SelectionChangedEvent.class, new SelectionChangedEvent.Handler() {
  
              @Override
              public void onSelectionChanged(SelectionChangedEvent event) {
                  setSelectedItems(event.getItemIds());
              }
          });
      }
  
      public StatusBarView start(EventBus eventBus, ContentPresenter activeContentPresenter) {
  
          this.eventBus = eventBus;
          this.activeContentPresenter = activeContentPresenter;
  
          view.addComponent(selectionLabel, Alignment.TOP_LEFT);
          ((HorizontalLayout) view).setExpandRatio(selectionLabel, 1);
  
          bindHandlers();
  
          refresh();
  
          return view;
     }
 
     public void setSelectedItems(Set<Object> itemIds) {
         if (!itemIds.isEmpty()) {
             Object id = itemIds.iterator().next();
             rootIsSelected = ObjectUtils.equals(id, contentConnector.getDefaultItemId());
             setSelectedItem(id, itemIds.size());
         } else {
             rootIsSelected = true;
             setSelectedItem(contentConnector.getDefaultItemId(), itemIds.size());
         }
     }
 
     public void setSelectedItem(Object itemId, int totalSelected) {
         // selection might contain the configured root path (by default '/') but we don't want to count that
         if (rootIsSelected && totalSelected > 0) {
             totalSelected--;
         }
         if (totalSelected == 1) {
             String newValue = contentConnector.getItemUrlFragment(itemId);
             selectionLabel.setValue(newValue);
             selectionLabel.setDescription(newValue);
         } else {
             String selected = i18n.translate("ui-contentapp.statusbar.selected", totalSelected);
             selectionLabel.setValue(selected);
             selectionLabel.setDescription(selected);
         }
     }
 
     public void refresh() {
         // active presenter can be null initially when there are multiple browser subapps
         if (activeContentPresenter == null) {
             return;
         }
 
         int selected = activeContentPresenter.getSelectedItemIds().size();
 
         if (selected == 1) {
             Object selectedItemId = activeContentPresenter.getSelectedItemIds().get(0);
             if (!contentConnector.canHandleItem(selectedItemId)) {
                 setSelectedItem(null, 0);
             } else {
                 setSelectedItem(selectedItemId, selected);
             }
         } else {
             setSelectedItem(null, selected);
         }
     }
 
     public void setActivePresenter(ContentPresenter activePresenter) {
         this.activeContentPresenter = activePresenter;
     }
 
 }