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   *  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.graphql.model.context;
  
  import java.util.Comparator;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.function.Predicate;
  import java.util.stream.Collectors;
  
  import graphql.schema.GraphQLCodeRegistry;
  import graphql.schema.GraphQLEnumType;
  
  import static graphql.schema.GraphQLEnumType.newEnum;
  import static graphql.schema.GraphQLEnumValueDefinition.newEnumValueDefinition;
  
  import org.springframework.stereotype.Component;
  
  import org.apache.causeway.applib.id.HasLogicalType;
  import org.apache.causeway.applib.services.bookmark.BookmarkService;
  import org.apache.causeway.applib.services.registry.ServiceRegistry;
  import org.apache.causeway.commons.collections.ImmutableEnumSet;
  import org.apache.causeway.commons.functional.Either;
  import org.apache.causeway.core.config.CausewayConfiguration;
  import org.apache.causeway.core.config.environment.CausewaySystemEnvironment;
  import org.apache.causeway.core.metamodel.objectmanager.ObjectManager;
  import org.apache.causeway.core.metamodel.spec.ActionScope;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.specloader.SpecificationLoader;
  import org.apache.causeway.viewer.graphql.model.domain.TypeNames;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.CommonDomainObject;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.CommonDomainService;
  import org.apache.causeway.viewer.graphql.model.registry.GraphQLTypeRegistry;
  import org.apache.causeway.viewer.graphql.model.types.TypeMapper;
  
  import lombok.RequiredArgsConstructor;
  
  @Component
  @RequiredArgsConstructor
  public class Context {
  
      public final GraphQLCodeRegistry.Builder codeRegistryBuilder = GraphQLCodeRegistry.newCodeRegistry();
      public final BookmarkService bookmarkService;
      public final SpecificationLoader specificationLoader;
      public final TypeMapper typeMapper;
      public final ServiceRegistry serviceRegistry;
      public final CausewayConfiguration causewayConfiguration;
      public final CausewaySystemEnvironment causewaySystemEnvironment;
      public final ObjectManager objectManager;
      public final GraphQLTypeRegistry graphQLTypeRegistry;
  
      public final Map<String, CommonDomainService> domainServiceByTypeName = new LinkedHashMap<>();
      public final Map<String, CommonDomainObject> domainObjectByTypeName = new LinkedHashMap<>();
  
      private GraphQLEnumType logicalTypeNames;
  
      public GraphQLEnumType getLogicalTypeNames() {
          if (logicalTypeNames == null) {
              computeLogicalTypeNames();
          }
          return logicalTypeNames;
      }
  
      public ImmutableEnumSet<ActionScope> getActionScope() {
          return causewaySystemEnvironment.getDeploymentType().isProduction()
                  ? ActionScope.PRODUCTION_ONLY
                  : ActionScope.ANY;
      }
  
      public List<? extends ObjectSpecification> objectSpecifications() {
          return objectSpecifications(spec -> true);
      }
  
      public List<? extends ObjectSpecification> objectSpecifications(final Predicate<ObjectSpecification> predicate) {
          var includeEntities = causewayConfiguration.getViewer().getGraphql().getApiScope() == CausewayConfiguration.Viewer.Graphql.ApiScope.ALL;
          return specificationLoader.snapshotSpecifications()
                  .filter(x -> x.getCorrespondingClass().getPackage() != Either.class.getPackage())   // exclude the org.apache_causeway.commons.functional
                  .distinct((a, b) -> a.logicalTypeName().equals(b.logicalTypeName()))
                  .filter(x ->
                             x.isViewModel()
                          || (includeEntities && x.isEntity())
                          || (includeEntities && x.isAbstract()) // this is a little bit inaccurate; Person.class was not being picked up, not sure that MappedSuperclass is enough to install the EntityFacet though.
                          || x.getBeanSort().isManagedBeanContributing()
                  )
                  .filter(predicate)
                  .sorted(Comparator.comparing(HasLogicalType::logicalTypeName))
                  .toList();
      }
  
      private void computeLogicalTypeNames() {
          if (logicalTypeNames != null) {
              return;
          }
          logicalTypeNames = doComputeLogicalTypeNames();
          graphQLTypeRegistry.addTypeIfNotAlreadyPresent(logicalTypeNames);
      }
  
      private GraphQLEnumType doComputeLogicalTypeNames() {
          var entitiesOrViewModels = objectSpecifications(ObjectSpecification::isEntityOrViewModel);
          return newEnum()
                  .name("logicalTypeNames__gqlv_enum")  // TODO: look this up from causeway configuration?
                  .values(entitiesOrViewModels.stream()
                          .map(objectSpec -> newEnumValueDefinition()
                                  .name(TypeNames.objectTypeFieldNameFor(objectSpec))
                                  .description(objectSpec.logicalTypeName())
                                  .value(objectSpec)
                                  .build()).collect(Collectors.toList())
                  )
                  .build();
      }
  }
  