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.restfulobjects.rendering.service.swagger.internal;
  
  import java.util.Collection;
  import java.util.List;
  import java.util.function.Predicate;
  import java.util.stream.Collectors;
  
  import org.apache.causeway.applib.services.swagger.Visibility;
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.collections.ImmutableEnumSet;
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.commons.internal.exceptions._Exceptions;
  import org.apache.causeway.core.metamodel.spec.ActionScope;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.spec.feature.MixedIn;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectAction;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectAssociation;
  import org.apache.causeway.core.metamodel.spec.feature.OneToManyAssociation;
  import org.apache.causeway.core.metamodel.spec.feature.OneToOneAssociation;
  import org.apache.causeway.core.metamodel.util.Facets;
  
  import lombok.experimental.UtilityClass;
  
  @UtilityClass
  final class _Util {
  
      boolean isVisibleForPublic(final ObjectAction objectAction) {
  
          final ObjectSpecification specification = objectAction.getReturnType();
          return ( isVisibleForPublic(specification) || isTypeOfVisibleForPublic(objectAction) )
                  && isVisibleForPublic(objectAction.getParameterTypes());
      }
  
      private boolean isTypeOfVisibleForPublic(final ObjectAction objectAction) {
          return isVisibleForPublic(objectAction.getElementType());
      }
  
      private boolean isVisibleForPublic(final Can<ObjectSpecification> parameterTypes) {
  
          final boolean atLeastOneParamNotVisible =
                  parameterTypes.stream()
                      .map(_Util::isNotVisibleForPublic)
                      .findAny()
                      .isPresent();
  
          return !atLeastOneParamNotVisible;
      }
  
      boolean isVisibleForPublic(final ObjectAssociation objectAssociation) {
          final ObjectSpecification specification = objectAssociation.getElementType();
          return isVisibleForPublic(specification);
      }
  
      boolean isNotVisibleForPublic(final ObjectSpecification specification) {
          return ! isVisibleForPublic(specification);
      }
  
      boolean isVisibleForPublic(final ObjectSpecification specification) {
          if (specification == null) {
              return true;
          }
          if(specification.isViewModel()) {
              return true;
          }
          if(specification.isValue()) {
              return true;
          }
          if(specification.isPlural()) {
              var elementSpec = Facets.elementSpec(specification).orElse(null);
              if(elementSpec != null) {
                  return isVisibleForPublic(elementSpec);
              }
          }
  
          final Class<?> correspondingClass = specification.getCorrespondingClass();
          return Collection.class.isAssignableFrom(correspondingClass) ||
                  correspondingClass.isArray() ||
                  correspondingClass == void.class ||
                  correspondingClass == Void.class;
      }
  
      Predicate<ObjectAssociation> associationsWith(final Visibility visibility) {
          return objectAssociation -> !visibility.isPublic() || isVisibleForPublic(objectAssociation);
      }
  
      List<OneToOneAssociation> propertiesOf(
              final ObjectSpecification objectSpecification,
              final Visibility visibility) {
          return associationsOf(objectSpecification, ObjectAssociation.Predicates.PROPERTIES, visibility);
      }
  
      List<OneToManyAssociation> collectionsOf(
              final ObjectSpecification objectSpecification,
              final Visibility visibility) {
          return associationsOf(objectSpecification, ObjectAssociation.Predicates.COLLECTIONS, visibility);
      }
  
      private <T extends ObjectAssociation> List<T> associationsOf(
              final ObjectSpecification objectSpecification,
              final Predicate<ObjectAssociation> associationPredicate, final Visibility visibility) {
  
          return objectSpecification.streamAssociations(MixedIn.INCLUDED)
                  .filter(associationPredicate.and(associationsWith(visibility)))
                  .map(x->_Casts.<T>uncheckedCast(x))
                  .collect(Collectors.toList());
      }
  
      List<ObjectAction> actionsOf(
              final ObjectSpecification objectSpec,
              final Visibility visibility,
              final ClassExcluder classExcluder) {
          var actionTypes = actionScopesFor(visibility);
  
          return objectSpec.streamActions(actionTypes, MixedIn.INCLUDED)
                  .filter(objectAction->
                      !classExcluder.exclude(objectAction)
                      && !visibility.isPublic()
                      || isVisibleForPublic(objectAction) )
                  .collect(Collectors.toList());
      }
  
      ImmutableEnumSet<ActionScope> actionScopesFor(final Visibility visibility) {
          switch (visibility) {
          case PUBLIC:
          case PRIVATE:
              return ActionScope.PRODUCTION_ONLY;
          case PRIVATE_WITH_PROTOTYPING:
              return ActionScope.ANY;
          }
          throw _Exceptions.unmatchedCase(visibility);
      }
  
  }
  