content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package org.apache.causeway.viewer.wicket.ui.components.widgets.select2;
  
  import java.io.Serializable;
  
  import org.apache.wicket.model.IModel;
  import org.apache.wicket.model.LambdaModel;
  import org.apache.wicket.model.Model;
  import org.wicketstuff.select2.AbstractSelect2Choice;
  
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.objectmanager.memento.ObjectMemento;
  import org.apache.causeway.core.metamodel.util.Facets;
  import org.apache.causeway.viewer.wicket.model.models.MultiChoiceModel;
  import org.apache.causeway.viewer.wicket.model.models.SingleChoiceModel;
  import org.apache.causeway.viewer.wicket.model.models.UiAttributeWkt;
  import org.apache.causeway.viewer.wicket.ui.components.attributes.AttributeModelChangeDispatcher;
  
  public interface Select2 extends Serializable {
  
      static Select2 create(
          final String id,
          final UiAttributeWkt attributeModel,
          final AttributeModelChangeDispatcher select2ChangeDispatcher) {
          var choiceProvider = new ChoiceProvider(attributeModel);
          var select2 = attributeModel.isSingular()
                  ? new SingleChoice(id,
                                  new SingleChoiceModel(attributeModel),
                                  attributeModel,
                                  choiceProvider)
                  : new MultiChoice(id,
                                  _Casts.uncheckedCast(new MultiChoiceModel(attributeModel)),
                                  attributeModel,
                                  choiceProvider);
          var component = select2.component();
          var settings = component.getSettings();
          settings.setCloseOnSelect(true);
          settings.setDropdownAutoWidth(true);
          settings.setWidth("100%");
          settings.setPlaceholder(attributeModel.getFriendlyName());
  
          switch(attributeModel.getChoiceProviderSort()) {
              case AUTO_COMPLETE->settings.setMinimumInputLength(attributeModel.getAutoCompleteMinLength());
              case OBJECT_AUTO_COMPLETE->Facets.autoCompleteMinLength(attributeModel.getElementType())
                  .ifPresent(settings::setMinimumInputLength);
              case CHOICES, NO_CHOICES->{}
          }
  
          component.setOutputMarkupPlaceholderTag(true);
          component.setLabel(Model.of(attributeModel.getFriendlyName()));
  
          // listen on select2:select/unselect events (client-side)
          component.add(new OnSelectBehavior(attributeModel, select2ChangeDispatcher));
  
          return select2;
      }
  
      AbstractSelect2Choice<ObjectMemento, ?> component();
      ManagedObject convertedInputValue();
      ObjectMemento objectMemento();
  
      default IModel<String> obtainOutputFormatModel() {
          return LambdaModel.<String>of(()->{
              var memento = objectMemento();
              return memento!=null
                      ? memento.title()
                      : null;
          });
      }
  
      // -- SHORTCUTS
  
      default void clearInput() {
          component().clearInput();
      }
  
      default boolean checkRequired() {
          return component().checkRequired();
      }
  
      default void setMutable(final boolean mutability) {
          component().setEnabled(mutability);
      }
  
  }
  