/**
    * 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.contentapp.configuration.column.component;
  
  import info.magnolia.ui.contentapp.configuration.column.ColumnEditorDefinition;
  import info.magnolia.ui.contentapp.configuration.column.ConfiguredColumnDefinition;
  import info.magnolia.ui.field.FieldDefinition;
  import info.magnolia.ui.field.factory.FieldFactory;
  import info.magnolia.ui.framework.ioc.UiContextBoundComponentProvider;
  
  import java.util.Optional;
  
  import com.vaadin.data.Converter;
  import com.vaadin.data.HasValue;
  import com.vaadin.data.Result;
  import com.vaadin.data.ValueContext;
  import com.vaadin.data.ValueProvider;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.renderers.ComponentRenderer;
  
  import lombok.AllArgsConstructor;
  
  /**
   * Defines a column that displays a component.
   */
  public class ColumnComponentDefinition<T> extends ConfiguredColumnDefinition<T> {
  
      public ColumnComponentDefinition() {
          setRenderer(ComponentRenderer.class);
          setValueProvider((Class) ComponentValueProvider.class);
      }
  
      /**
       * Provides a value for a given column component.
       *
       * @param <S>
       *     source value type.
       */
      public static class ComponentValueProvider<S> implements ValueProvider<Object, Component> {
  
          private final ColumnComponentDefinition<S> componentDefinition;
          private final ValueProvider<Object, S> wrapped;
          private final UiContextBoundComponentProvider componentProvider;
  
          public ComponentValueProvider(ColumnComponentDefinition<S> componentDefinition, ValueProvider<Object, S> wrapped, UiContextBoundComponentProvider componentProvider) {
              this.componentDefinition = componentDefinition;
              this.wrapped = wrapped;
              this.componentProvider = componentProvider;
          }
  
          @Override
          public Component apply(Object item) {
              return Optional.ofNullable(componentDefinition.getEditor()).map(ColumnEditorDefinition::getField).map((FieldDefinition<S> fieldDefinition) -> {
                  FieldFactory<S> fieldFactory = componentProvider.inChildContext(fieldDefinition).newInstance(fieldDefinition.getFactoryClass());
                  HasValue<S> field = fieldFactory.createField();
                  Component asComponent = (Component) field;
                  asComponent.setEnabled(false);
                  S value = wrapped.apply(item);
                  if (value != null) {
                      field.setValue(value);
                  }
                  return asComponent;
              }).orElse(null);
          }
  
          /**
           * Vaadin converter implementation which translates between a pre-set component
           * and an arbitrary value.
          */
         @AllArgsConstructor
         public static class ComponentConverter implements Converter<Object, Object> {
 
             private HasValue value;
 
             @Override
             public Result<Object> convertToModel(Object value, ValueContext context) {
                 return Result.ok(this.value);
             }
 
             @Override
             public Object convertToPresentation(Object value, ValueContext context) {
                 return value;
             }
         }
     }
 }