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.object;
  
  import java.util.Optional;
  
  import org.jspecify.annotations.Nullable;
  
  import org.apache.causeway.applib.value.semantics.Renderer;
  import org.apache.causeway.applib.value.semantics.TemporalSupport;
  import org.apache.causeway.applib.value.semantics.TemporalSupport.TemporalDecomposition;
  import org.apache.causeway.applib.value.semantics.ValueSemanticsProvider;
  import org.apache.causeway.commons.internal.exceptions._Exceptions;
  import org.apache.causeway.core.metamodel.facets.object.value.ValueFacet;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectFeature;
  
  import org.jspecify.annotations.NonNull;
  import lombok.experimental.UtilityClass;
  
  @UtilityClass
  public class MmValueUtils {
  
      // -- CONTEXT FACTORIES
  
      public Optional<ValueSemanticsProvider.Context> createValueSemanticsContext(
              final @Nullable ObjectFeature feature,
              final @Nullable ObjectSpecification elementType) {
          return valueFacet(elementType, Object.class)
                  .map(valueFacet->valueFacet.createValueSemanticsContext(feature));
      }
  
      public Optional<ValueSemanticsProvider.Context> createValueSemanticsContext(
              final @Nullable ObjectFeature feature,
              final @Nullable ManagedObject valueObject) {
          return valueFacet(valueObject, Object.class)
                  .map(valueFacet->valueFacet.createValueSemanticsContext(feature));
      }
  
      // -- RENDERER
  
      public String htmlStringForValueType(
              final @Nullable ObjectFeature feature,
              final @Nullable ManagedObject adapter) {
  
          if(!ManagedObjects.isSpecified(adapter)) return "";
  
          var spec = adapter.objSpec();
          var valueFacet = spec.valueFacet().orElse(null);
          if(valueFacet==null) {
              return String.format("missing ValueFacet %s", spec.getCorrespondingClass());
          }
  
          @SuppressWarnings("unchecked")
          var renderer = (Renderer<Object>) valueFacet.selectRendererForFeature(feature).orElse(null);
          if(renderer==null) {
              return String.format("missing Renderer %s", spec.getCorrespondingClass());
          }
  
          return renderer.htmlPresentation(valueFacet.createValueSemanticsContext(feature), adapter.getPojo());
      }
  
      // -- TEMPORAL SUPPORT
  
      public Optional<TemporalSupport<?>> temporalSupport(
              final @Nullable ObjectFeature objectFeature,
              final @Nullable ObjectSpecification elementType) {
          return valueFacet(elementType, Object.class)
                  .flatMap(valueFacet->selectTemporalSupportForFeature(valueFacet, objectFeature));
      }
  
      public TemporalSupport<?> temporalSupportElseFail(
              final @Nullable ObjectFeature objectFeature,
              final @NonNull ObjectSpecification elementType) {
          return temporalSupport(objectFeature, elementType)
                  .orElseThrow(()->_Exceptions.illegalState("no temporal support found for %s",
                          elementType));
      }
  
      public Optional<TemporalDecomposition> temporalDecomposition(
              final @Nullable ObjectFeature objectFeature,
              final @Nullable ManagedObject valueObject) {
          return valueFacet(valueObject, Object.class)
                  .filter(valueFacet->!ManagedObjects.isNullOrUnspecifiedOrEmpty(valueObject))
                  .flatMap(valueFacet->selectTemporalSupportForFeature(valueFacet, objectFeature))
                  .flatMap(temporalDecomposer->
                      temporalDecomposer.decomposeTemporal(MmUnwrapUtils.single(valueObject)));
      }
  
      // -- HELPER
  
      @SuppressWarnings("unchecked")
      private <T> Optional<ValueFacet<T>> valueFacet(final @Nullable ObjectSpecification elementType, final Class<T> valueClass) {
          return elementType!=null
                  ? elementType.valueFacet().map((final ValueFacet<?> v)->(ValueFacet<T>)v)
                  : Optional.empty();
      }
  
      private <T> Optional<ValueFacet<T>> valueFacet(final @Nullable ManagedObject valueObject, final Class<T> valueClass) {
          return ManagedObjects.isSpecified(valueObject)
              ? valueFacet(valueObject.objSpec(), valueClass)
              : Optional.empty();
      }
  
      private <T> Optional<TemporalSupport<T>> selectTemporalSupportForFeature(
              final ValueFacet<T> valueFacet,
              final ObjectFeature objectFeature) {
          return valueFacet.selectTemporalSupportForFeature(objectFeature);
      }
  
  }
  