/**
    * This file Copyright (c) 2010-2015 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.vaadin.gwt.client.applauncher.connector;
  
  import info.magnolia.ui.vaadin.applauncher.AppLauncher;
  import info.magnolia.ui.vaadin.gwt.client.applauncher.shared.AppGroup;
  import info.magnolia.ui.vaadin.gwt.client.applauncher.shared.AppTile;
  import info.magnolia.ui.vaadin.gwt.client.applauncher.widget.AppLauncherView;
  import info.magnolia.ui.vaadin.gwt.client.applauncher.widget.AppLauncherView.Presenter;
  import info.magnolia.ui.vaadin.gwt.client.applauncher.widget.AppLauncherViewImpl;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  import com.google.gwt.dom.client.Element;
  import com.google.gwt.event.shared.HandlerRegistration;
  import com.google.gwt.user.client.Event;
  import com.google.gwt.user.client.History;
  import com.google.gwt.user.client.ui.Widget;
  import com.google.web.bindery.event.shared.EventBus;
  import com.google.web.bindery.event.shared.SimpleEventBus;
  import com.vaadin.client.communication.StateChangeEvent;
  import com.vaadin.client.communication.StateChangeEvent.StateChangeHandler;
  import com.vaadin.client.ui.AbstractComponentConnector;
  import com.vaadin.shared.ui.Connect;
  
  /**
   * Client-side connector for {@link AppLauncher} component.
   */
  @Connect(AppLauncher.class)
  public class AppLauncherConnector extends AbstractComponentConnector {
  
      private AppLauncherView view;
  
      private EventBus eventBus = new SimpleEventBus();
  
      private HandlerRegistration eventPreviewHandle;
  
      public AppLauncherConnector() {
  
          addStateChangeHandler("appGroups", new StateChangeHandler() {
              @Override
              public void onStateChanged(StateChangeEvent stateChangeEvent) {
                  // set groups in specified order
                  List<AppGroup> groups = new ArrayList<AppGroup>(getState().appGroups.values());
                  Collections.sort(groups, new GroupComparator(getState().groupsOrder));
  
                  // add groups to the view
                  view.clear();
                  for (final AppGroup appGroup : groups) {
                      view.addAppGroup(appGroup);
                      for (final AppTile tile : appGroup.getAppTiles()) {
                          view.addAppTile(tile, appGroup);
                      }
                  }
  
                  updateRunningAppTiles();
              }
          });
  
          addStateChangeHandler("runningApps", new StateChangeHandler() {
              @Override
              public void onStateChanged(StateChangeEvent stateChangeEvent) {
                  updateRunningAppTiles();
              }
          });
     }
 
     @Override
     protected void init() {
         super.init();
         this.eventPreviewHandle = Event.addNativePreviewHandler(new Event.NativePreviewHandler() {
             @Override
             public void onPreviewNativeEvent(Event.NativePreviewEvent event) {
                 int eventCode = event.getTypeInt();
                 boolean isTouchOrMouse = (eventCode & Event.MOUSEEVENTS) > 0 || (eventCode & Event.TOUCHEVENTS) > 0;
 
                 final Element eventTarget = event.getNativeEvent().getEventTarget().cast();
 
                 if (!getWidget().getElement().isOrHasChild(eventTarget)) {
                     return;
                 }
 
                 if ((isTouchOrMouse && eventCode != Event.ONMOUSEOVER && eventCode != Event.ONMOUSEOUT && getConnection().hasActiveRequest())) {
                     event.cancel();
                 }
             }
         });
     }
 
     private void updateRunningAppTiles() {
         for (final AppGroup appGroup : getState().appGroups.values()) {
             for (final AppTile tile : appGroup.getAppTiles()) {
                 if (getState().runningApps.contains(tile.getName())) {
                     view.setAppActive(tile.getName(), true);
                 } else {
                     view.setAppActive(tile.getName(), false);
                 }
             }
         }
     }
 
     @Override
     public Widget getWidget() {
         return super.getWidget();
     }
 
     @Override
     protected Widget createWidget() {
         this.view = new AppLauncherViewImpl(eventBus);
         this.view.setPresenter(new Presenter() {
             @Override
             public void activateApp(final String appName) {
                 History.newItem("app:" + appName, true);
             }
         });
         return view.asWidget();
     }
 
     @Override
     public AppLauncherState getState() {
         return (AppLauncherState) super.getState();
     }
 
     @Override
     protected AppLauncherState createState() {
         return new AppLauncherState();
     }
 
 
     @Override
     public void onUnregister() {
         super.onUnregister();
         eventPreviewHandle.removeHandler();
     }
 
     /**
      * This comparator helps ordering the list of groups according to the specified groupsOrder, yet accounting as well for ordering all permanent groups
      * before all temporary groups. This ensures accurate relative depth of groups in the applauncher.
      */
     static class GroupComparator implements Comparator<AppGroup> {
 
         private List<String> groupOrder;
 
         public GroupComparator(List<String> groupOrder) {
             this.groupOrder = groupOrder;
         }
 
         @Override
         public int compare(AppGroup o1, AppGroup o2) {
             boolean perm1 = o1.isPermanent();
             boolean perm2 = o2.isPermanent();
             if (perm1 == perm2) {
                 Integer idx1 = groupOrder.indexOf(o1.getName());
                 Integer idx2 = groupOrder.indexOf(o2.getName());
                 return idx1.compareTo(idx2);
             }
             return perm1 == true ? -1 : 1;
         }
     }
 
 }