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.actionlinks.serviceactions;
  
  import java.util.List;
  
  import org.apache.wicket.MarkupContainer;
  import org.apache.wicket.markup.html.list.ListItem;
  import org.apache.wicket.markup.html.list.ListView;
  import org.apache.wicket.markup.html.panel.Fragment;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.viewer.wicket.ui.panels.PanelBase;
  import org.apache.causeway.viewer.wicket.ui.util.Wkt;
  
  @SuppressWarnings("rawtypes")
  abstract class MenuActionPanel extends PanelBase {
  
      private static final long serialVersionUID = 1L;
  
      public MenuActionPanel(final String id) {
          super(id);
      }
  
      protected ListView<CssMenuItem> subMenuItemsView(final Can<CssMenuItem> subMenuItems) {
          return Wkt.listView("subMenuItems", subMenuItems.toList(), listItem->{
              var subMenuItem = listItem.getModelObject();
  
              switch(subMenuItem.menuableKind()) {
              case SECTION_SEPARATOR:
                  addSpacer(subMenuItem, listItem);
                  return;
              case SECTION_LABEL:
                  addSectionLabel(subMenuItem, listItem);
                  return;
              default:
                  // fall through
              }
  
              if (subMenuItem.hasSubMenuItems()) {
                  addFolderItem(subMenuItem, listItem);
              } else {
                  addLeafItem(subMenuItem, listItem);
              }
          });
      }
  
      protected Can<CssMenuItem> flatten(final List<CssMenuItem> menuItems) {
          return menuItems.stream()
                  .map(CssMenuItem::getSubMenuItems)
                  .flatMap(Can::stream)
                  .collect(Can.toCan());
      }
  
      // -- HELPER
  
      private void addFolderItem(final CssMenuItem menuItem, final ListItem<CssMenuItem> listItem) {
          final MarkupContainer parent = this;
          ServiceActionUtil.addFolderItem(menuItem, listItem, parent);
      }
  
      private void addLeafItem(final CssMenuItem menuItem, final ListItem<CssMenuItem> listItem) {
          final MarkupContainer parent = this;
          ServiceActionUtil.addLeafItem(menuItem, listItem, parent);
      }
  
      private void addSpacer(final CssMenuItem menuItem, final ListItem<CssMenuItem> listItem) {
          final MarkupContainer parent = this;
          var fragment = new Fragment("content", "separatorItem", parent);
          listItem.add(fragment);
          Wkt.cssAppend(listItem, "list-separator");
      }
  
      private void addSectionLabel(final CssMenuItem menuItem, final ListItem<CssMenuItem> listItem) {
          final MarkupContainer parent = this;
          var fragment = new Fragment("content", "sectionItem", parent);
          Wkt.labelAdd(fragment, "sectionLabel", menuItem.getName());
          listItem.add(fragment);
          Wkt.cssAppend(listItem, "list-section-label");
      }
  
  }
  