/**
    * This file Copyright (c) 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.incub;
  
  import java.util.Optional;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.vaadin.ui.Button;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.CustomField;
  import com.vaadin.ui.HorizontalLayout;
  import com.vaadin.ui.NativeButton;
  import com.vaadin.ui.TextField;
  import com.vaadin.ui.VerticalLayout;
  
  /**
   * A base custom field comprising a text field and a button placed to its immediate right.
   * A {@link PropertyTranslator} can be set in order to have a different display and property stored.
   * For example, display can be the Item path and value stored is the identifier of the Item.
   *
   * TODO compare with actual V8 impl in new UI framework and/or drop.
   */
  public class LinkField extends CustomField<String> {
      // Define layout and component
      private final VerticalLayout rootLayout = new VerticalLayout();
      private final HorizontalLayout linkLayout = new HorizontalLayout();
      private final TextField textField = new TextField();
      private final Button selectButton = new NativeButton();
      private Component contentPreview;
      private String buttonCaptionNew;
      private String buttonCaptionOther;
      private boolean isFieldEditable;
  
      public LinkField() {
      }
  
      @Override
      protected Component initContent() {
          addStyleName("linkfield");
          // Initialize root
          rootLayout.setSizeFull();
          rootLayout.setMargin(false);
          rootLayout.setSpacing(true);
          // Handle Text Field
          textField.setWidth(100, Unit.PERCENTAGE);
          textField.addValueChangeListener(event ->
                  setValue(String.valueOf(Optional.ofNullable(event.getValue()).orElse(""))));
  
          // Handle Link Layout (Text Field & Select Button)
          linkLayout.setSizeFull();
          linkLayout.setSpacing(false);
          linkLayout.addComponents(textField);
          linkLayout.setExpandRatio(textField, 1);
          //linkLayout.setComponentAlignment(textField, Alignment.MIDDLE_LEFT);
          // Only Handle Select button if the Text field is not Read Only.
          if (!textField.isReadOnly()) {
              selectButton.addStyleName("magnoliabutton");
              linkLayout.addComponent(selectButton);
              linkLayout.setExpandRatio(selectButton, 0);
              //linkLayout.setComponentAlignment(selectButton, Alignment.MIDDLE_RIGHT);
          }
          setButtonCaption(StringUtils.EMPTY);
          rootLayout.addComponent(linkLayout);
  
          this.addValueChangeListener(event -> updateComponents(getValue()));
  
          updateComponents(getValue());
         return rootLayout;
     }
 
     public TextField getTextField() {
         return this.textField;
     }
 
     public Button getSelectButton() {
         return this.selectButton;
     }
 
     @Override
     public String getValue() {
         return textField.getValue();
     }
 
     @Override
     public void setReadOnly(boolean readOnly) {
         super.setReadOnly(readOnly);
         textField.setReadOnly(readOnly);
     }
 
     @Override
     protected void doSetValue(String s) {
         textField.setValue(s);
     }
 
     /**
      * Update the Link component. <br>
      * - Set text Field as read only if desired. In this case remove the add button.
      * - If it is not read only. update the button label.
      */
     private void updateComponents(String currentValue) {
         if (!isFieldEditable && StringUtils.isNotBlank(currentValue)) {
             textField.setReadOnly(true);
             if (linkLayout.getComponentIndex(selectButton) != -1) {
                 linkLayout.removeComponent(selectButton);
             }
         } else {
             setButtonCaption(currentValue);
         }
     }
 
     private void setButtonCaption(String value) {
         if (StringUtils.isNotBlank(value)) {
             selectButton.setCaption(buttonCaptionOther);
             selectButton.setDescription(buttonCaptionOther);
         } else {
             selectButton.setCaption(buttonCaptionNew);
             selectButton.setDescription(buttonCaptionNew);
         }
     }
 
     public void setContentPreview(Component contentPreviewComponent) {
         if (contentPreview != null) {
             rootLayout.removeComponent(contentPreview);
         }
         contentPreviewComponent.setVisible(StringUtils.isNotBlank(textField.getValue()));
         rootLayout.addComponentAsFirst(contentPreviewComponent);
         contentPreview = contentPreviewComponent;
     }
 
     /**
      * Caption section.
      */
     public void setButtonCaptionNew(String buttonCaptionNew) {
         this.buttonCaptionNew = buttonCaptionNew;
     }
 
     public void setButtonCaptionOther(String buttonCaptionOther) {
         this.buttonCaptionOther = buttonCaptionOther;
     }
 
     public void setFieldEditable(boolean isFieldEditable) {
         this.isFieldEditable = isFieldEditable;
     }
 }