/**
    * This file Copyright (c) 2011 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.model.ModelStorage;
  
  import java.util.List;
  
  import com.google.gwt.dom.client.Element;
  import com.google.gwt.dom.client.Style.Unit;
  
  /**
   * Helper class to keep tack on selected items.
   */
  public class FocusModelImpl implements FocusModel {
  
      private ModelStorage storage;
  
      public FocusModelImpl(ModelStorage storage) {
          super();
          this.storage = storage;
      }
  
      @Override
      public void handleClick(Element element) {
  
      }
  
      @Override
      public void handleClick (MgnlElement mgnlElement) {
  
          hideRoot();
          if (storage.getSelectedMgnlElement() != null) {
              deSelect(storage.getSelectedMgnlElement());
          }
          select(mgnlElement);
  
          storage.setSelectedMgnlElement(mgnlElement);
      }
  
      @Override
      public void reset() {
          deSelect();
          showRoot();
          computeOverlay();
      }
  
      protected void select(MgnlElement mgnlElement) {
  
          if (mgnlElement != null) {
  
                  if (storage.getOverlay(mgnlElement) != null) {
                      storage.getOverlay(mgnlElement).setVisible(false);
                  }
                  if (mgnlElement != null) {
                      if (storage.getEditBar(mgnlElement) != null) {
                          storage.getEditBar(mgnlElement).setVisible(true);
                      }
                  }
  
                  for (MgnlElement component : mgnlElement.getComponents()) {
                      if (storage.getOverlay(component) != null) {
                          storage.getOverlay(component).setVisible(false);
                      }
                      if (storage.getEditBar(component) != null) {
                          storage.getEditBar(component).setVisible(true);
                      }
 
                 }
                 for (MgnlElement parentArea = mgnlElement.getParentArea(); parentArea != null; parentArea= parentArea.getParentArea()) {
                     if (storage.getOverlay(parentArea) != null) {
                         storage.getOverlay(parentArea).setVisible(false);
 
                     }
                 }
                 computeOverlay();
            }
     }
 
     public void deSelect() {
         if (storage.getSelectedMgnlElement() != null) {
             deSelect(storage.getSelectedMgnlElement());
         }
     }
 
     public void deSelect(MgnlElement mgnlElement) {
         mgnlElement = mgnlElement.getRoot();
         if (mgnlElement != null) {
 
             if (storage.getOverlay(mgnlElement) != null) {
                 storage.getOverlay(mgnlElement).setVisible(true);
 
             }
             for (MgnlElement descendant : mgnlElement.getDescendants()) {
                 if (storage.getOverlay(descendant) != null) {
                     storage.getOverlay(descendant).setVisible(true);
 
                 }
                 if (storage.getEditBar(descendant) != null) {
                     if (!descendant.getParent().equals(mgnlElement)) {
                         storage.getEditBar(descendant).setVisible(false);
                     }
 
                 }
 
             }
             computeOverlay();
 
         }
     }
 
     public void showRoot() {
         for (MgnlElement root : storage.getRootElements()) {
             if (storage.getEditBar(root) != null) {
                 storage.getEditBar(root).setVisible(true);
 
             }
         }
     }
     public void hideRoot() {
         for (MgnlElement root : storage.getRootElements()) {
             if (root != null && storage.getEditBar(root) != null) {
                 storage.getEditBar(root).setVisible(false);
 
             }
         }
     }
 
     public void computeOverlay () {
         for (MgnlElement root : storage.getRootElements()) {
             List<MgnlElement> mgnlElements = root.getDescendants();
             mgnlElements.add(root);
             for (MgnlElement mgnlElement : mgnlElements) {
 
                 if (storage.getOverlay(mgnlElement) == null) {
                     continue;
                 }
 
                 Element firstElement = mgnlElement.getFirstElement();
                 if (firstElement == null) {
                     continue;
                 }
                 storage.getOverlay(mgnlElement).getElement().getStyle().setTop(firstElement.getAbsoluteTop(), Unit.PX);
                 storage.getOverlay(mgnlElement).getElement().getStyle().setLeft(firstElement.getAbsoluteLeft(), Unit.PX);
                 storage.getOverlay(mgnlElement).getElement().getStyle().setWidth(firstElement.getAbsoluteRight() - firstElement.getAbsoluteLeft(), Unit.PX);
 
                 Element lastElement = mgnlElement.getLastElement();
                 if (lastElement != null) {
                     storage.getOverlay(mgnlElement).getElement().getStyle().setHeight(lastElement.getAbsoluteBottom() - storage.getOverlay(mgnlElement).getElement().getAbsoluteTop(), Unit.PX);
                 }
             }
         }
     }
 }