/**
    * This file Copyright (c) 2010-2018 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.vaadin.gwt.client.actionbar.widget;
  
  import info.magnolia.ui.vaadin.gwt.client.actionbar.event.ActionTriggerEvent;
  import info.magnolia.ui.vaadin.gwt.client.actionbar.shared.ActionbarItem;
  import info.magnolia.ui.vaadin.gwt.client.actionbar.shared.ActionbarSection;
  
  import java.util.Collection;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.logging.Logger;
  
  import com.google.gwt.user.client.DOM;
  import com.google.gwt.user.client.Element;
  import com.google.gwt.user.client.Event;
  import com.google.gwt.user.client.ui.ComplexPanel;
  import com.google.gwt.user.client.ui.FlowPanel;
  import com.google.gwt.user.client.ui.Image;
  import com.google.gwt.user.client.ui.Widget;
  import com.google.web.bindery.event.shared.EventBus;
  import com.googlecode.mgwt.dom.client.event.touch.TouchStartEvent;
  import com.googlecode.mgwt.dom.client.event.touch.TouchStartHandler;
  import com.googlecode.mgwt.ui.client.widget.touch.TouchDelegate;
  
  /**
   * The Class VActionbarViewImpl, GWT implementation for the VActionbarView interface.
   */
  public class ActionbarWidgetViewImpl extends ComplexPanel implements ActionbarWidgetView, ActionTriggerEvent.Handler {
  
      private static final Logger log = Logger.getLogger(ActionbarWidgetViewImpl.class.getName());
  
      public static final String CLASSNAME = "v-actionbar";
  
      public static final String CLASSNAME_TOGGLE = "v-actionbar-toggle";
  
      private final Element root = DOM.createElement("section");
  
      private final FlowPanel toggleButton = new FlowPanel(); // Must be a widget so that it can capture events
  
      private final Element toggleButtonIcon = DOM.createElement("span");
  
      private final EventBus eventBus;
  
      private Presenter presenter;
  
      private int tabletRow = -1; // Used to assign rows and columns to each action item
  
      private int tabletColumn = 0;
  
      private boolean isToggledOpen = false;
  
      private final TouchDelegate delegate = new TouchDelegate(toggleButton);
  
      private final Map<String, ActionbarSectionWidget> sections = new LinkedHashMap<String, ActionbarSectionWidget>();
  
      public ActionbarWidgetViewImpl(final EventBus eventBus, Presenter presenter) {
          setElement(root);
          addStyleName(CLASSNAME);
  
          this.presenter = presenter;
          this.eventBus = eventBus;
          this.eventBus.addHandler(ActionTriggerEvent.TYPE, this);
  
          createToggleControl();
  
          isToggledOpen = !presenter.isDeviceTablet();
          actualizeToggleState(isToggledOpen);
     }
 
 
     private void createToggleControl() {
 
         toggleButton.addStyleName(CLASSNAME_TOGGLE);
         add(toggleButton, root);
 
         toggleButtonIcon.addClassName("v-actionbar-toggle-icon");
         toggleButton.getElement().appendChild(toggleButtonIcon);
 
         DOM.sinkEvents(toggleButton.getElement(), Event.TOUCHEVENTS);
         delegate.addTouchStartHandler(new TouchStartHandler() {
             @Override
             public void onTouchStart(TouchStartEvent event) {
                 isToggledOpen = !isToggledOpen;
                 presenter.setOpened(isToggledOpen);
             }
         });
     }
 
     /*
      * Actions positions in tablet mode are set via row_x and col_x classes.
      * These need to be updated anytime a section is hidden or shown.
      */
     @Override
     public void refreshActionsPositionsTablet() {
 
         if (!presenter.isDeviceTablet()) {
             return;
         }
 
         tabletRow = -1; // Used to assign rows and columns to each action item
         tabletColumn = 0;
 
         for (final ActionbarSectionWidget section : sections.values()) {
 
             // if section is visible - then update rows & cols
             if (section.isVisible()) {
 
                 for (final VActionbarGroup group : section.getGroups().values()) {
 
                     tabletColumn = 0;
                     tabletRow++;
 
                     for (ActionbarItemWidget action : group.getActions()) {
                         // Add a flyout indicator if this is the first action and there are other
                         // actions
                         if (group.getNumActions() > 1) {
                             if (tabletColumn == 0) {
                                 action.addStyleName("flyout");
                             }
                         } else {
                             action.removeStyleName("flyout");
                         }
                         ((VActionbarItemTablet) action).setRow(tabletRow);
                         ((VActionbarItemTablet) action).setColumn(tabletColumn);
                         tabletColumn++;
                     }
                 }
             }
         }
         setToggleButtonHeights(tabletRow);
     }
 
     /**
      * Actualize the state of the actionbar 'openness' by setting classes on html elements.
      */
     private void actualizeToggleState(boolean isOpen) {
         if (isOpen) {
             toggleButtonIcon.addClassName("open");
         } else {
             toggleButtonIcon.removeClassName("open");
         }
         if (presenter.isDeviceTablet()) {
             for (final ActionbarSectionWidget section : sections.values()) {
                 for (final VActionbarGroup group : section.getGroups().values()) {
                     group.setOpenHorizontally(isOpen);
                 }
             }
         }
     }
 
     @Override
     public Map<String, ActionbarSectionWidget> getSections() {
         return sections;
     }
 
     @Override
     public void setPresenter(final Presenter presenter) {
         this.presenter = presenter;
     }
 
     public void addSection(ActionbarSection sectionParams) {
         ActionbarSectionWidget section = new ActionbarSectionWidget(sectionParams);
         sections.put(sectionParams.getName(), section);
         add(section, root);
     }
 
     public void addAction(ActionbarItem actionParams, String sectionName) {
         ActionbarSectionWidget section = sections.get(sectionName);
         if (section != null) {
             VActionbarGroup group = section.getGroups().get(actionParams.getGroupName());
             if (group == null) {
                 tabletColumn = 0;
                 tabletRow++;
                 group = new VActionbarGroup(actionParams.getGroupName());
                 section.addGroup(group);
                 setToggleButtonHeights(tabletRow);
             }
 
             ActionbarItemWidget action;
             if (presenter.isDeviceTablet()) {
                 action = new VActionbarItemTablet(actionParams, group, eventBus);
                 ((VActionbarItemTablet) action).setRow(tabletRow);
                 ((VActionbarItemTablet) action).setColumn(tabletColumn);
                 tabletColumn++;
             } else {
                 action = new ActionbarItemWidget(actionParams, group, eventBus);
             }
             group.addAction(action);
         }
     }
 
     /**
      * For tablet mode, position these buttons at the bottom of the button stack.
      */
     private void setToggleButtonHeights(int tabletRow) {
         // Position toggleButton at bottom of stack.
         toggleButton.setStyleName(CLASSNAME_TOGGLE + " row-" + (tabletRow + 1));
     }
 
     @Override
     public void onActionTriggered(ActionTriggerEvent event) {
         ActionbarItemWidget action = event.getSource();
         ActionbarSectionWidget section = (ActionbarSectionWidget) action.getParent().getParent();
         presenter.triggerAction(section.getName() + ":" + action.getName());
     }
 
     @Override
     public void setSections(Collection<ActionbarSection> newSections) {
         for (final ActionbarSectionWidget section : this.sections.values()) {
             remove(section);
         }
         sections.clear();
         for (final ActionbarSection section : newSections) {
             addSection(section);
             for (final String actionName : section.getActionOrder()) {
                 ActionbarItem action = section.getActions().get(actionName);
                 if (action.getIconFontId() == null) {
                     action.setResourceUrl(presenter.getIconResourceURL(action.getName()));
                 }
                 addAction(action, section.getName());
             }
         }
         updateLayout();
         refreshActionsPositionsTablet();
     }
 
     @Override
     public void setVisibleSections(Collection<ActionbarSection> visibleSections) {
         for (final ActionbarSectionWidget section : sections.values()) {
             section.setVisible(visibleSections.contains(section.getData()));
         }
         updateLayout();
         refreshActionsPositionsTablet();
     }
 
     @Override
     public void setDisabledActions(Collection<ActionbarItem> disabledActions) {
         for (final ActionbarSectionWidget section : sections.values()) {
             for (final VActionbarGroup group : section.getGroups().values()) {
                 for (final ActionbarItemWidget action : group.getActions()) {
                     action.setEnabled(!disabledActions.contains(action.getData()));
                 }
             }
         }
     }
 
     @Override
     public boolean isOpen() {
         return isToggledOpen;
     }
 
     @Override
     public void setOpen(boolean isOpen) {
         actualizeToggleState(isToggledOpen);
         if (isToggledOpen != isOpen) {
             presenter.forceLayout();
             updateLayout();
         }
     }
 
     @Override
     public void setSectionPreview(String sectionName, String previewUrl) {
         ActionbarSectionWidget sectionWidget = sections.get(sectionName);
         if (sectionWidget != null) {
             sectionWidget.addStyleName("preview");
             sectionWidget.setPreview(new Image(previewUrl));
         }
     }
 
     @Override
     public void updateLayout() {
         // sections margin
         final int MARGIN_TOP = 35;
 
         int availableHeight = getOffsetHeight();
         if (sections.containsKey("preview") && sections.get("preview").isVisible() && isToggledOpen) {
             availableHeight -= 200;
         }
 
         int actualHeight = 0;
         for (ActionbarSectionWidget section : sections.values()) {
             if (!section.getName().equals("preview") && section.isVisible()) {
                 section.getElement().getStyle().clearProperty("maxHeight");
                 actualHeight += section.getOffsetHeight() + MARGIN_TOP; // add margin
             }
         }
         log.fine("actualHeight/availableHeight: " + actualHeight + "/" + availableHeight);
 
         // rewind from bottom-up to shrink sections
         int i = getWidgetCount() - 1;
         int minimumHeight = 75;
         while (actualHeight > availableHeight && i >= 0) {
             log.fine("rewinding widget list, current height diff: " + (actualHeight - availableHeight) + " (i=" + i + ")");
             Widget widget = getWidget(i);
             if (widget instanceof ActionbarSectionWidget && widget.isVisible()) {
                 String sectionName = ((ActionbarSectionWidget) widget).getName();
                 if (!sectionName.equals("preview")) {
                     int currentHeight = widget.getOffsetHeight() + MARGIN_TOP;
                     if (currentHeight > minimumHeight) {
                         int newHeight = (actualHeight - availableHeight > currentHeight - minimumHeight) ? minimumHeight : currentHeight + availableHeight - actualHeight;
                         log.fine(sectionName + " currentHeight => newHeight: " + currentHeight + "=>" + (newHeight - MARGIN_TOP));
                         widget.getElement().getStyle().setPropertyPx("maxHeight", newHeight - MARGIN_TOP); // account for padding or margin;
                         actualHeight -= (currentHeight - newHeight);
                     }
                 }
             }
             i--;
         }
     }
 
 }