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.core.metamodel.valuesemantics;
  
  import java.util.stream.Stream;
  
  import jakarta.annotation.Priority;
  import jakarta.inject.Inject;
  import jakarta.inject.Named;
  
  import org.springframework.stereotype.Component;
  
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.applib.graph.tree.TreeAdapter;
  import org.apache.causeway.applib.graph.tree.TreeNode;
  import org.apache.causeway.applib.graph.tree.TreePath;
  import org.apache.causeway.applib.graph.tree.TreeState;
  import org.apache.causeway.applib.services.factory.FactoryService;
  import org.apache.causeway.applib.services.urlencoding.UrlEncodingService;
  import org.apache.causeway.applib.value.semantics.Renderer;
  import org.apache.causeway.applib.value.semantics.ValueDecomposition;
  import org.apache.causeway.applib.value.semantics.ValueSemanticsAbstract;
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.commons.internal.memento._Mementos;
  import org.apache.causeway.commons.internal.memento._Mementos.Memento;
  import org.apache.causeway.commons.internal.memento._Mementos.SerializingAdapter;
  import org.apache.causeway.schema.common.v2.ValueType;
  
  @Component
  @Named("causeway.metamodel.value.TreeNodeValueSemantics")
  @Priority(PriorityPrecedence.LATE)
  public class TreeNodeValueSemantics
  extends ValueSemanticsAbstract<TreeNode<?>>
  implements
      Renderer<TreeNode<?>> {
  
      @Inject UrlEncodingService urlEncodingService;
      @Inject SerializingAdapter serializingAdapter;
      @Inject FactoryService factoryService;
  
      @Override
      public Class<TreeNode<?>> getCorrespondingClass() {
          return _Casts.uncheckedCast(TreeNode.class);
      }
  
      @Override
      public ValueType getSchemaValueType() {
          return ValueType.STRING;
      }
  
      // -- COMPOSER
  
      @Override
      public ValueDecomposition decompose(final TreeNode<?> value) {
          return decomposeAsString(value, this::toEncodedString, ()->null);
      }
  
      @Override
      public TreeNode<?> compose(final ValueDecomposition decomposition) {
          return composeFromString(decomposition, this::fromEncodedString, ()->null);
      }
  
      private String toEncodedString(final TreeNode<?> treeNode) {
          final Memento memento = newMemento();
          memento.put("rootValue", treeNode.rootValue());
          memento.put("adapterClass", treeNode.treeAdapter().getClass());
          memento.put("treeState", treeNode.treeState());
          memento.put("treePath", treeNode.treePath());
          return memento.asString();
      }
  
      @SuppressWarnings("unchecked")
      private TreeNode<?> fromEncodedString(final String input) {
          final Memento memento = parseMemento(input);
          final TreeNode<?> rootNode = TreeNode.root(
                  memento.get("rootValue", Object.class),
                  memento.get("adapterClass", Class.class),
                  memento.get("treeState", TreeState.class),
                  factoryService);
          return rootNode.resolve(memento.get("treePath", TreePath.class))
                  .orElse(null);
      }
  
      // -- RENDERER
  
      @Override
      public String titlePresentation(final Context context, final TreeNode<?> value) {
          return renderTitle(value, TreeNode::toString);
      }
  
      @Override
      public String htmlPresentation(final Context context, final TreeNode<?> value) {
          return renderHtml(value, TreeNode::toString);
      }
  
      // -- EXAMPLES
  
      @Override
      public Can<TreeNode<?>> getExamples() {
  
          class TreeAdapterString implements TreeAdapter<String> {
              @Override public int childCountOf(final String value) {
                  return 0; }
              @Override public Stream<String> childrenOf(final String value) {
                  return Stream.empty(); }
          }
  
          return Can.of(
                  TreeNode.root("TreeRoot", new TreeAdapterString(), TreeState.rootCollapsed()),
                  TreeNode.root("another TreeRoot", new TreeAdapterString(), TreeState.rootCollapsed()));
      }
  
      // -- HELPER
  
      private _Mementos.Memento newMemento(){
          return _Mementos.create(urlEncodingService, serializingAdapter);
      }
  
      private _Mementos.Memento parseMemento(final String input){
          return _Mementos.parse(urlEncodingService, serializingAdapter, input);
      }
  
  }
  