/**
    * This file Copyright (c) 2013-2018 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.layout;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.vaadin.data.Property;
  import com.vaadin.data.Property.ValueChangeEvent;
  import com.vaadin.data.Property.ValueChangeListener;
  import com.vaadin.data.util.ObjectProperty;
  import com.vaadin.data.util.converter.Converter;
  import com.vaadin.shared.ui.MarginInfo;
  import com.vaadin.shared.ui.label.ContentMode;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.CssLayout;
  import com.vaadin.ui.Label;
  import com.vaadin.ui.VerticalLayout;
  
  /**
   * The SmallAppLayout, offering space for a header component and multiple sections stacked vertically.
   */
  public class SmallAppLayout extends VerticalLayout {
  
      private Property<String> description = new ObjectProperty<String>("");
  
      private VerticalLayout root = this;
  
      private CssLayout sectionsLayout = new CssLayout();
  
      private Label descriptionLabel = new Label();
  
      public SmallAppLayout() {
          root.addStyleName("smallapp");
          root.setSizeFull();
          root.setMargin(new MarginInfo(true, false, false, false));
  
          descriptionLabel.addStyleName("description");
          descriptionLabel.setContentMode(ContentMode.HTML);
          descriptionLabel.setConverter(new StringToHtmlConverter());
          descriptionLabel.setPropertyDataSource(description);
          descriptionLabel.addValueChangeListener(new ValueChangeListener() {
  
              @Override
              public void valueChange(ValueChangeEvent event) {
                  if (StringUtils.isNotBlank((String) event.getProperty().getValue())) {
                      descriptionLabel.setVisible(true);
                  } else {
                      descriptionLabel.setVisible(false);
                  }
              }
          });
          root.addComponent(descriptionLabel);
  
          sectionsLayout.addStyleName("smallapp-sections");
          sectionsLayout.setSizeFull();
          root.addComponent(sectionsLayout);
          root.setExpandRatio(sectionsLayout, 1);
      }
  
      @Override
      public String getDescription() {
          return description.getValue();
      }
 
     @Override
     public void setDescription(String description) {
         this.description.setValue(description);
     }
 
     public List<Component> getSections() {
         Iterator<Component> it = sectionsLayout.iterator();
         List<Component> sections = new ArrayList<Component>();
         while (it.hasNext()) {
             sections.add(it.next());
         }
         return sections;
     }
 
     public void addSection(Component section) {
         section.addStyleName("smallapp-section");
         sectionsLayout.addComponent(section);
     }
 
     public void removeSection(Component section) {
         sectionsLayout.removeComponent(section);
     }
 
     /**
      * The StringToHtmlConverter, currently only turns carriage-returns into HTML br elements.
      */
     private class StringToHtmlConverter implements Converter<String, String> {
 
         @Override
         public String convertToModel(String value, Class<? extends String> targetType, Locale locale) throws com.vaadin.data.util.converter.Converter.ConversionException {
             return value.replaceAll("<br/>", "\n");
         }
 
         @Override
         public String convertToPresentation(String value, Class<? extends String> targetType, Locale locale) throws com.vaadin.data.util.converter.Converter.ConversionException {
             if (value != null) {
                 return value.replaceAll("\n", "<br/>");
             }
             return null;
         }
 
         @Override
         public Class<String> getModelType() {
             return String.class;
         }
 
         @Override
         public Class<String> getPresentationType() {
             return String.class;
         }
 
     }
 
 }