/**
    * This file Copyright (c) 2011-2014 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.templating.editor.client.model.focus;
  
  import info.magnolia.templating.editor.client.dom.MgnlElement;
  import info.magnolia.templating.editor.client.jsni.JavascriptUtils;
  import info.magnolia.templating.editor.client.model.ModelStorage;
  import info.magnolia.templating.editor.client.widget.dnd.LegacyDragAndDrop;
  
  import com.google.gwt.dom.client.Element;
  
  /**
   * Helper class to keep tack on selected items.
   */
  public class FocusModelImpl3 implements FocusModel {
  
      private final ModelStorage model;
      private boolean rootSelected = false;
  
      public FocusModelImpl3(ModelStorage model) {
          super();
          this.model = model;
      }
  
      @Override
      public void onMouseUp(Element element) {
  
          MgnlElement mgnlElement = model.getMgnlElement(element);
  
          if (LegacyDragAndDrop.isMoving()) {
              if (!LegacyDragAndDrop.sourceBar.getMgnlElement().isRelated(mgnlElement)) {
                  LegacyDragAndDrop.moveComponentReset();
                  reset();
              }
              return;
          }
          if (mgnlElement == null) {
              reset();
          }
  
          else if (mgnlElement.getParentArea() != null) {
              MgnlElement area = mgnlElement.getParentArea();
              if (area != model.getSelectedMgnlElement()) {
                  deSelect();
                  hideRoot();
                  toggleSelection(area, true, true);
                  if (area != area.getTopParentArea()) {
                      toggleSelection(area.getTopParentArea(), true, false);
                  }
                  model.setSelectedMgnlElement(area);
              }
          }
      }
  
      @Override
      public void onLoadSelect(MgnlElement selectedMgnlElement) {
          model.setSelectedMgnlElement(selectedMgnlElement);
          toggleRootAreaBar(false);
          showRootPlaceHolder();
          toggleSelection(selectedMgnlElement, true, true);
      }
      @Override
      public void reset() {
          deSelect();
          toggleRootAreaBar(true);
          showRootPlaceHolder();
      }
  
     private void toggleSelection(MgnlElement mgnlElement, boolean visible, boolean setCookies) {
         if (setCookies) {
             if (visible) {
                 String contentId = mgnlElement.getAttribute("content");
                 JavascriptUtils.setEditorContentIdCookie(contentId);
             } else {
                 JavascriptUtils.removeEditorContentIdCookie();
             }
         }
 
         if (model.getEditBar(mgnlElement) != null) {
             model.getEditBar(mgnlElement).setVisible(visible);
         }
         if (model.getAreaEndBar(mgnlElement) != null) {
             model.getAreaEndBar(mgnlElement).setVisible(visible);
         }
 
         // toggle all direct child-areas place holders visibility - does this case occur (isn't this method called always on parent area)?
         for (MgnlElement area : mgnlElement.getAreas()) {
             if (model.getAreaPlaceHolder(area) != null) {
                 model.getAreaPlaceHolder(area).setVisible(visible);
             }
         }
 
         for (MgnlElement component : mgnlElement.getComponents()) {
 
             // toggle all child-components edit bar visibility
             if (model.getEditBar(component) != null) {
                 model.getEditBar(component).setVisible(visible);
             }
             // toggle all child-components-area placeholder visibility
             for (MgnlElement area : component.getAreas()) {
                 // we have to make area always visible...
                 if (model.getAreaPlaceHolder(area) != null) { // ...if it's empty we render place holder
                     model.getAreaPlaceHolder(area).setVisible(visible);
                 } else { // ...or we render edit bars if it has some components (otherwise the area containing only empty components wouldn't be accessible)
                     if (model.getEditBar(area) != null) {
                         model.getEditBar(area).setVisible(visible);
                     }
                     if (model.getAreaEndBar(area) != null) {
                         model.getAreaEndBar(area).setVisible(visible);
                     }
                 }
             }
         }
 
         if (model.getAreaPlaceHolder(mgnlElement)!= null) {
             if (mgnlElement.getParent() != null) {
                 model.getAreaPlaceHolder(mgnlElement).setVisible(visible);
             }
             model.getAreaPlaceHolder(mgnlElement).setActive(visible);
         }
 
         if (model.getComponentPlaceHolder(mgnlElement) != null) {
             model.getComponentPlaceHolder(mgnlElement).setVisible(visible);
         }
     }
 
     private void deSelect() {
         MgnlElement parentArea = model.getSelectedMgnlElement() != null ? model.getSelectedMgnlElement().getParentArea() : null;
         MgnlElement topParentArea = parentArea != null ? parentArea.getTopParentArea() : null;
 
         if (parentArea  != null) {
             toggleSelection(parentArea, false, true);
             if (topParentArea != parentArea) {
                 toggleSelection(topParentArea, false, false);
             }
             model.setSelectedMgnlElement(null);
         }
     }
 
     @Override
     public void toggleRootAreaBar(boolean visible) {
         deSelect();
 
         this.rootSelected = !this.rootSelected;
         for (MgnlElement root : model.getRootElements()) {
             if (model.getEditBar(root) != null) {
                 model.getEditBar(root).setVisible(visible);
             }
             if (model.getAreaEndBar(root) != null) {
                 model.getAreaEndBar(root).setVisible(visible);
             }
             if (model.getAreaPlaceHolder(root) != null) {
                 model.getAreaPlaceHolder(root).setVisible(visible);
             }
         }
     }
 
     private void showRootPlaceHolder() {
         for (MgnlElement root : model.getRootElements()) {
             if (model.getAreaPlaceHolder(root) != null) {
                 model.getAreaPlaceHolder(root).setVisible(true);
                 model.getAreaPlaceHolder(root).setActive(false);
             }
         }
     }
 
     private void hideRoot() {
         for (MgnlElement root : model.getRootElements()) {
             if (model.getEditBar(root) != null) {
                 model.getEditBar(root).setVisible(false);
             }
             if (model.getAreaEndBar(root) != null) {
                 model.getAreaEndBar(root).setVisible(false);
             }
             if (model.getComponentPlaceHolder(root) != null) {
                 model.getComponentPlaceHolder(root).setVisible(false);
             }
             if (model.getAreaPlaceHolder(root) != null) {
                 model.getAreaPlaceHolder(root).setVisible(true);
             }
         }
     }
 }