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.layout.bs.tabs;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.apache.wicket.extensions.markup.html.tabs.AbstractTab;
  import org.apache.wicket.extensions.markup.html.tabs.ITab;
  import org.apache.wicket.extensions.markup.html.tabs.TabbedPanel;
  import org.apache.wicket.markup.html.panel.Panel;
  import org.apache.wicket.model.Model;
  
  import org.apache.causeway.applib.layout.grid.bootstrap.BSTab;
  import org.apache.causeway.applib.layout.grid.bootstrap.BSTabGroup;
  import org.apache.causeway.commons.internal.base._NullSafe;
  import org.apache.causeway.viewer.wicket.model.models.UiObjectWkt;
  import org.apache.causeway.viewer.wicket.model.util.ComponentHintKey;
  import org.apache.causeway.viewer.wicket.ui.panels.HasDynamicallyVisibleContent;
  
  import de.agilecoders.wicket.core.markup.html.bootstrap.tabs.AjaxBootstrapTabbedPanel;
  
  // hmmm... not sure how to make this implement HasDynamicallyVisibleContent
  public class TabGroupPanel
  extends AjaxBootstrapTabbedPanel<ITab>
  implements HasDynamicallyVisibleContent {
  
      private static final long serialVersionUID = 1L;
  
      public static final String SESSION_ATTR_SELECTED_TAB = "selectedTab";
  
      // the view metadata
      private final ComponentHintKey selectedTabHintKey;
      private final UiObjectWkt objectModel;
  
      private static List<ITab> tabsFor(final UiObjectWkt objectModel, final BSTabGroup bsTabGroup) {
          final List<ITab> tabs = new ArrayList<>();
  
          final List<BSTab> tablist = _NullSafe.stream(bsTabGroup.getTabs())
                  .filter(BSTab.Predicates.notEmpty())
                  .collect(Collectors.toList());
  
          for (var bsTab : tablist) {
              var repeatingViewWithDynamicallyVisibleContent = TabPanel.newRows(objectModel, bsTab);
              String tabName = bsTab.getName();
              tabs.add(new AbstractTab(Model.of(tabName)) {
                  private static final long serialVersionUID = 1L;
  
                  @Override
                  public Panel getPanel(final String panelId) {
                      return new TabPanel(panelId, objectModel, bsTab, repeatingViewWithDynamicallyVisibleContent);
                  }
  
                  @Override
                  public boolean isVisible() {
                      return repeatingViewWithDynamicallyVisibleContent.isVisible();
                  }
              });
          }
          return tabs;
      }
  
      public TabGroupPanel(final String id, final UiObjectWkt objectModel, final BSTabGroup bsTabGroup) {
          super(id, tabsFor(objectModel, bsTabGroup));
          this.objectModel = objectModel;
  
          this.selectedTabHintKey = ComponentHintKey.create(objectModel.getMetaModelContext(), this, SESSION_ATTR_SELECTED_TAB);
      }
  
      @Override
      protected void onInitialize() {
          setSelectedTabFromSessionIfAny(this);
          super.onInitialize();
      }
  
      @Override
      public TabbedPanel<ITab> setSelectedTab(final int index) {
          selectedTabHintKey.set(objectModel.getOwnerBookmark(), ""+index);
          return super.setSelectedTab(index);
      }
  
      private void setSelectedTabFromSessionIfAny(
              final AjaxBootstrapTabbedPanel<ITab> ajaxBootstrapTabbedPanel) {
          final String selectedTabStr = selectedTabHintKey.get(objectModel.getOwnerBookmark());
          final Integer tabIndex = parse(selectedTabStr);
          if (tabIndex != null) {
              final int numTabs = ajaxBootstrapTabbedPanel.getTabs().size();
              if (tabIndex < numTabs) {
                  // to support dynamic reloading; the data in the session might not be compatible with current layout.
                  ajaxBootstrapTabbedPanel.setSelectedTab(tabIndex);
              }
          }
      }
  
      private Integer parse(final String selectedTabStr) {
          try {
              return Integer.parseInt(selectedTabStr);
          } catch (NumberFormatException e) {
              return null;
          }
      }
  
      @Override
      public boolean isVisible() {
          return _NullSafe.stream(getTabs())
                  .anyMatch(ITab::isVisible);
      }
  
  }
  