/**
    * This file Copyright (c) 2010-2012 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.form;
  
  import info.magnolia.ui.vaadin.gwt.client.form.VFormSection;
  
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  
  import com.vaadin.terminal.ErrorMessage;
  import com.vaadin.terminal.PaintException;
  import com.vaadin.terminal.PaintTarget;
  import com.vaadin.ui.AbstractComponent;
  import com.vaadin.ui.AbstractLayout;
  import com.vaadin.ui.ClientWidget;
  import com.vaadin.ui.ClientWidget.LoadStyle;
  import com.vaadin.ui.Component;
  
  /**
   * Form layout server side implementation.
   */
  @ClientWidget(value = VFormSection.class, loadStyle = LoadStyle.EAGER)
  public class FormSection extends AbstractLayout {
  
      private boolean isValidationVisible = false;
  
      private final List<Component> components = new LinkedList<Component>();
  
      private final Map<Component, String> helpDescriptions = new HashMap<Component, String>();
  
      public FormSection() {
          addStyleName("v-form-layout");
      }
  
      @Override
      public void paintContent(PaintTarget target) throws PaintException {
          super.paintContent(target);
          final Iterator<Component> it = getComponentIterator();
          target.addAttribute("validationVisible", isValidationVisible);
          while (it.hasNext()) {
              final Component c = it.next();
              target.startTag("component");
              c.addStyleName("v-form-field");
              c.setSizeUndefined();
              c.paint(target);
              if (helpDescriptions.containsKey(c)) {
                  target.addAttribute("helpDescription", helpDescriptions.get(c));
              }
              target.endTag("component");
          }
      }
  
      public void setComponentHelpDescription(Component c, String description) {
          if (components.contains(c)) {
              helpDescriptions.put(c, description);
              requestRepaint();
          } else {
              throw new IllegalArgumentException("Layout doesn't contain this component.");
          }
      }
  
      @Override
      public void addComponent(Component c) {
          super.addComponent(c);
          components.add(c);
         requestRepaint();
     }
 
     @Override
     public void replaceComponent(Component oldComponent, Component newComponent) {
     }
 
     @Override
     public Iterator<Component> getComponentIterator() {
         return components.iterator();
     }
 
     public void setValidationVisible(boolean isVisible) {
         this.isValidationVisible = isVisible;
         requestRepaint();
     }
 
     @Override
     public ErrorMessage getErrorMessage() {
         final Iterator<Component> it = getComponentIterator();
         while (it.hasNext()) {
             final Component c = it.next();
             if (c instanceof AbstractComponent) {
                 final ErrorMessage errMsg = ((AbstractComponent) c).getErrorMessage();
                 if (errMsg != null) {
                     return errMsg;
                 }
             }
         }
         return super.getErrorMessage();
     }
 
     public boolean hasError() {
         return getErrorMessage() != null && isValidationVisible;
     }
 
 }