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.commons.applib.services.menu.model;
  
  import java.io.Serializable;
  import java.util.Locale;
  
  import org.jspecify.annotations.Nullable;
  
  import org.apache.causeway.applib.annotation.DomainServiceLayout;
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.viewer.commons.applib.services.menu.MenuVisitor;
  
  public record NavbarSection(
          DomainServiceLayout.MenuBar menuBarSelect,
          Can<MenuDropdown> topLevelEntries) implements Serializable {
  
      public String cssClass() {
          return menuBarSelect.name().toLowerCase(Locale.ENGLISH);
      }
  
      /**
       * Depth-first visit of the model.
       * @param menuVisitor
       */
      public void visitMenuItems(final @Nullable MenuVisitor menuVisitor) {
          if(menuVisitor==null) return;
  
          topLevelEntries.forEach(topLevel->{
              menuVisitor.onTopLevel(topLevel);
              topLevel.subEntries().forEach(subEntry->{
                  var asAction = subEntry.asAction();
                  asAction.ifPresentOrElse(menuVisitor::onMenuAction, ()->{
                      var asSpacer = subEntry.asSpacer();
                      asSpacer.ifPresent(spacer->{
                          if(spacer.isEmpty()) {
                              menuVisitor.onSectionSpacer();
                          } else {
                              menuVisitor.onSectionLabel(spacer.label());
                          }
                      });
                  });
  
              });
          });
  
      }
  
  }
  