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   *  Licensed to the Apache Software Foundation (ASF) under one
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   *  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
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   */
  package org.apache.causeway.core.metamodel.facets.object.navchild;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.core.metamodel._testing.MetaModelContext_forTesting;
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.core.metamodel.facets.FacetFactoryTestAbstract;
  import org.apache.causeway.core.metamodel.facets.collections.layout.CollectionLayoutFacetFactory;
  import org.apache.causeway.core.metamodel.specloader.SpecificationLoader;
  
  class NavigableSubtreeFacetFactoryTest extends FacetFactoryTestAbstract {
  
      CollectionLayoutFacetFactory facetFactory;
      NavigableSubtreeFacetPostProcessor postProcessor;
      SpecificationLoader specLoader;
  
      @BeforeEach
      void setUp() {
          var mmc = MetaModelContext_forTesting.buildDefault();
          assertNotNull(MetaModelContext.instanceNullable());
          facetFactory = new CollectionLayoutFacetFactory(mmc);
          postProcessor = new NavigableSubtreeFacetPostProcessor(mmc);
          specLoader = mmc.getSpecificationLoader();
      }
  
      @AfterEach
      protected void tearDown() {
          facetFactory = null;
      }
  
      @Test
      void treeNodeFacetShouldBeInstalledWhenNodeHasAnnotations() {
          
          collectionScenario(_TreeSample.A.class, "childrenB", (processMethodContext, facetHolder, facetedMethod)->{
              facetFactory.process(processMethodContext);
              assertNotNull(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
              // copy over facets to spec for testing later
              var spec = specLoader.specForType(_TreeSample.A.class).orElseThrow();
              spec.getAssociationElseFail("childrenB")
                  .addFacet(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
          });
          
          collectionScenario(_TreeSample.A.class, "childrenC", (processMethodContext, facetHolder, facetedMethod)->{
              facetFactory.process(processMethodContext);
              assertNotNull(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
              // copy over facets to spec for testing later
              var spec = specLoader.specForType(_TreeSample.A.class).orElseThrow();
              spec.getAssociationElseFail("childrenC")
                  .addFacet(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
          });
          
          collectionScenario(_TreeSample.B.class, "childrenD", (processMethodContext, facetHolder, facetedMethod)->{
              facetFactory.process(processMethodContext);
              assertNotNull(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
              // copy over facets to spec for testing later
              var spec = specLoader.specForType(_TreeSample.B.class).orElseThrow();
              spec.getAssociationElseFail("childrenD")
                  .addFacet(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
          });
          
          collectionScenario(_TreeSample.C.class, "childrenD", (processMethodContext, facetHolder, facetedMethod)->{
              facetFactory.process(processMethodContext);
              assertNotNull(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
              // copy over facets to spec for testing later
              var spec = specLoader.specForType(_TreeSample.C.class).orElseThrow();
              spec.getAssociationElseFail("childrenD")
                  .addFacet(facetedMethod.getFacet(NavigableSubtreeSequenceFacet.class));
          });
          
          var specs = Can.of(_TreeSample.A.class, _TreeSample.B.class, _TreeSample.C.class, _TreeSample.D.class)
              .map(specLoader::specForType)
              .map(opt->opt.orElse(null));
          // now run the post-processor
          specs.forEach(postProcessor::postProcessObject);
          
          specs.forEach(spec->{
              switch(spec.getCorrespondingClass().getSimpleName()) {
                  case "A" -> assertNotNull(spec.getFacet(NavigableSubtreeFacet.class));
                  case "B" -> assertNotNull(spec.getFacet(NavigableSubtreeFacet.class));
                  case "C" -> assertNotNull(spec.getFacet(NavigableSubtreeFacet.class));
                  case "D" -> assertNull(spec.getFacet(NavigableSubtreeFacet.class));
                  default -> fail("unexpected case");
              }
          });
  
      }
  }
  