/**
    * This file Copyright (c) 2010-2013 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.form.formsection.connector;
  
  import info.magnolia.ui.vaadin.form.FormSection;
  import info.magnolia.ui.vaadin.gwt.client.form.formsection.widget.FormSectionWidget;
  import info.magnolia.ui.vaadin.gwt.client.form.rpc.FormSectionClientRpc;
  import info.magnolia.ui.vaadin.gwt.client.form.tab.connector.FormTabConnector;
  
  import java.util.List;
  
  import com.vaadin.client.ComponentConnector;
  import com.vaadin.client.ConnectorHierarchyChangeEvent;
  import com.vaadin.client.communication.StateChangeEvent;
  import com.vaadin.client.communication.StateChangeEvent.StateChangeHandler;
  import com.vaadin.client.ui.AbstractLayoutConnector;
  import com.vaadin.shared.Connector;
  import com.vaadin.shared.ui.Connect;
  
  /**
   * FormSectionConnector.
   */
  @Connect(FormSection.class)
  public class FormSectionConnector extends AbstractLayoutConnector {
  
      @Override
      protected void init() {
          super.init();
          registerRpc(FormSectionClientRpc.class, new FormSectionClientRpc() {
              @Override
              public void focus(Connector component) {
                  getWidget().focus(((ComponentConnector) component).getWidget());
              }
          });
      }
  
      private final StateChangeHandler childErrorMessageHandler = new StateChangeHandler() {
          @Override
          public void onStateChanged(StateChangeEvent event) {
              updateChildError((ComponentConnector) event.getConnector());
          }
      };
  
      private void updateChildError(ComponentConnector connector) {
          final String errorMsg = connector.getState().errorMessage;
          boolean errorOccurred = errorMsg != null && !errorMsg.isEmpty();
          if (getState().isValidationVisible && errorOccurred) {
              getWidget().setFieldError(connector.getWidget(), errorMsg);
          } else {
              getWidget().clearError(connector.getWidget());
          }
      }
  
      @Override
      public void onStateChanged(StateChangeEvent stateChangeEvent) {
          super.onStateChanged(stateChangeEvent);
          getWidget().setCaption(getState().caption);
          getWidget().setDescriptionVisible(getState().isDescriptionVisible);
          for (final ComponentConnector cc : getChildComponents()) {
              updateChildError(cc);
          }
      }
  
      @Override
      public FormTabConnector getParent() {
          return (FormTabConnector) super.getParent();
      }
  
     @Override
     public boolean delegateCaptionHandling() {
         return false;
     }
 
     @Override
     public void updateCaption(ComponentConnector connector) {
         getWidget().setFieldCaption(connector.getWidget(), connector.getState().caption);
     }
 
     @Override
     public void onConnectorHierarchyChange(ConnectorHierarchyChangeEvent e) {
         final List<ComponentConnector> oldChildren = e.getOldChildren();
         final List<ComponentConnector> newChildren = getChildComponents();
 
         oldChildren.removeAll(newChildren);
         for (final ComponentConnector cc : oldChildren) {
             getWidget().remove(cc.getWidget());
         }
 
         int index = 0;
         for (final ComponentConnector cc : newChildren) {
             getWidget().insert(cc.getWidget(), index++);
             cc.addStateChangeHandler("errorMessage", childErrorMessageHandler);
         }
     }
 
     @Override
     protected FormSectionState createState() {
         return new FormSectionState();
     }
 
     @Override
     public FormSectionState getState() {
         return (FormSectionState) super.getState();
     }
 
     @Override
     public FormSectionWidget getWidget() {
         return (FormSectionWidget) super.getWidget();
     }
 
     @Override
     public void onUnregister() {
         super.onUnregister();
     }
 }