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.attributes.markup;
  
  import java.io.Serializable;
  import java.util.Optional;
  
  import org.apache.wicket.markup.ComponentTag;
  import org.apache.wicket.markup.MarkupStream;
  import org.apache.wicket.markup.head.IHeaderResponse;
  import org.apache.wicket.markup.html.WebComponent;
  import org.apache.wicket.markup.parser.XmlTag.TagType;
  import org.apache.wicket.model.IModel;
  import org.jspecify.annotations.Nullable;
  
  import org.springframework.util.StringUtils;
  
  import org.apache.causeway.applib.value.semantics.Renderer.SyntaxHighlighter;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.object.MmValueUtils;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectFeature;
  import org.apache.causeway.viewer.commons.model.attrib.UiParameter;
  import org.apache.causeway.viewer.wicket.model.models.PropertyModel;
  import org.apache.causeway.viewer.wicket.model.models.ValueModel;
  
  public class MarkupComponent extends WebComponent {
  
      private static final long serialVersionUID = 1L;
  
      public record Options(SyntaxHighlighter syntaxHighlighter) implements Serializable {
          public static Options defaults() {
              return new Options(SyntaxHighlighter.NONE);
          }
      }
  
      // -- CONSTRUCTION
  
      private final Options options;
  
      public MarkupComponent(final String id, final IModel<?> model, final @Nullable Options options) {
          super(id, model);
          this.options = options == null
              ? Options.defaults()
              : options;
      }
  
      public MarkupComponent(final String id, final IModel<?> model) {
          this(id, model, null);
      }
  
      // --
  
      @Override
      public void renderHead(final IHeaderResponse response) {
          super.renderHead(response);
          highlightBehavior()
              .ifPresent(highlighter->highlighter.renderHead(response));
      }
  
      @Override
      public void onComponentTagBody(final MarkupStream markupStream, final ComponentTag openTag) {
          htmlContent()
              .ifPresentOrElse(html -> {
                  replaceComponentTagBody(markupStream, openTag,
                      highlightBehavior().map(highlighter->highlighter.htmlContentPostProcess(html)).orElse(html));
              }, ()->{
                  replaceComponentTagBody(markupStream, openTag, "");
              });
      }
  
      @Override
      protected void onComponentTag(final ComponentTag tag)	{
          super.onComponentTag(tag);
          tag.setType(TagType.OPEN);
      }
  
      // -- HELPER
  
      private Optional<HighlightBehavior> highlightBehavior() {
          return HighlightBehavior.lookup(options.syntaxHighlighter());
      }
  
      /**
       * Optionally returns the underlying model's HTML representation,
       * based on whether it is available and has length.
       */
      protected Optional<String> htmlContent() {
          var modelObject = getDefaultModelObject();
  
          if(modelObject==null) return Optional.empty();
  
          if(modelObject instanceof ManagedObject managedObj) {
              var feature = lookupObjectFeatureIn().orElse(null);
              var asHtml = MmValueUtils.htmlStringForValueType(feature, managedObj);
              return StringUtils.hasLength(asHtml)
                  ? Optional.of(asHtml)
                  : Optional.empty();
          }
  
          return Optional.ofNullable(modelObject.toString());
      }
  
      // -- HELPER
  
      protected Optional<ObjectFeature> lookupObjectFeatureIn() {
          var model = getDefaultModel();
  
          if(model instanceof PropertyModel propertyModel) {
              return Optional.of(propertyModel.getMetaModel());
          }
          if(model instanceof UiParameter uiParameter) {
              return Optional.of(uiParameter.getMetaModel());
          }
          if(model instanceof ValueModel valueModel) {
              return Optional.of(valueModel.objectMember());
          }
          return Optional.empty();
      }
  
  }
  