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.breadcrumbs;
  
  import java.util.Collection;
  import java.util.List;
  
  import org.apache.wicket.ajax.AjaxRequestTarget;
  import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
  import org.apache.wicket.model.IModel;
  import org.apache.wicket.model.Model;
  import org.apache.wicket.request.mapper.parameter.PageParameters;
  import org.wicketstuff.select2.ChoiceProvider;
  import org.wicketstuff.select2.Response;
  import org.wicketstuff.select2.Select2Choice;
  import org.wicketstuff.select2.Settings;
  
  import org.apache.causeway.applib.services.bookmark.Bookmark;
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.commons.internal.collections._Lists;
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.viewer.wicket.model.mementos.PageParameterNames;
  import org.apache.causeway.viewer.wicket.model.models.UiObjectWkt;
  import org.apache.causeway.viewer.wicket.ui.errors.JGrowlUtil;
  import org.apache.causeway.viewer.wicket.ui.pages.obj.DomainObjectPage;
  import org.apache.causeway.viewer.wicket.ui.panels.PanelAbstract;
  
  public class BreadcrumbPanel
  extends PanelAbstract<Void, IModel<Void>> {
  
      private static final long serialVersionUID = 1L;
  
      private static final String ID_BREADCRUMBS = "breadcrumbs";
  
      public BreadcrumbPanel(final String id) {
          super(id);
      }
  
      @Override
      protected void onInitialize() {
          super.onInitialize();
  
          final BreadcrumbModel breadcrumbModel = _Casts.castTo(BreadcrumbModelProvider.class, getSession())
                  .map(BreadcrumbModelProvider::getBreadcrumbModel)
                  .orElseGet(BreadcrumbModel::new); // for testing
  
          var choiceProvider = new ChoiceProvider<UiObjectWkt>() {
  
              private static final long serialVersionUID = 1L;
  
              @Override
              public String getDisplayValue(final UiObjectWkt choice) {
                  return titleFor(choice);
              }
  
              private String titleFor(final UiObjectWkt model) {
                  return model.getManagedObject().getTitle();
              }
  
              @Override
              public String getIdValue(final UiObjectWkt choice) {
                  try {
                      final PageParameters pageParameters = choice.getPageParametersWithoutUiHints();
                      final String oidStr = PageParameterNames.OBJECT_OID.getStringFrom(pageParameters);
  
                      return Bookmark.parse(oidStr)
                      .map(Bookmark::stringify)
                      .orElseGet(()->{
                          breadcrumbModel.remove(choice);
                          return null;
                      });
  
                  } catch (Exception ex) {
                      breadcrumbModel.remove(choice);
                      return null;
                  }
              }
  
              @Override
              public void query(final String term, final int page, final Response<UiObjectWkt> response) {
                  final List<UiObjectWkt> breadCrumbList = _Lists.newArrayList(breadcrumbModel.getList());
                  final List<UiObjectWkt> checkedList = _Lists.filter(breadCrumbList,
                          input -> {
                              final Object id = getIdValue(input);
                              return id != null;
                          });
                  response.addAll(checkedList);
              }
  
              @Override
              public Collection<UiObjectWkt> toChoices(final Collection<String> ids) {
                  return breadcrumbModel.getList();
              }
  
          };
          final Select2Choice<UiObjectWkt> breadcrumbChoice =
                  new Select2Choice<>(ID_BREADCRUMBS, new Model<>(), choiceProvider);
  
          breadcrumbChoice.add(
                  new AjaxFormComponentUpdatingBehavior("change"){
  
                      private static final long serialVersionUID = 1L;
  
                      @Override
                      protected void onUpdate(final AjaxRequestTarget target) {
                          final String oidStr = breadcrumbChoice.getInput();
                          final UiObjectWkt selectedModel = breadcrumbModel.lookup(oidStr);
                          if(selectedModel == null) {
                              var configuration = getMetaModelContext().getConfiguration();
  
                              getMetaModelContext().getMessageBroker()
                              .ifPresent(messageBroker->{
                                  messageBroker.addWarning("Cannot find object");
                                  String feedbackMsg = JGrowlUtil.asJGrowlCalls(messageBroker, configuration);
                                  target.appendJavaScript(feedbackMsg);
                              });
                              breadcrumbModel.remove(oidStr);
                              return;
                          }
                          setResponsePage(DomainObjectPage.class, selectedModel.getPageParametersWithoutUiHints());
                      }
  
                      private MetaModelContext getMetaModelContext() {
                          return BreadcrumbPanel.this.getMetaModelContext();
                      }
  
                  });
  
          final Settings settings = breadcrumbChoice.getSettings();
          settings.setMinimumInputLength(0);
          settings.setWidth("100%");
  
          addOrReplace(breadcrumbChoice);
      }
  
      @Override
      protected void onConfigure() {
          super.onConfigure();
  
          boolean shouldShow = getWicketViewerSettings().getBookmarkedPages().isShowDropDownOnFooter();
          setVisible(shouldShow);
      }
  
  }
  