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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.domain.rich.query;
  
  import java.util.Map;
  
  import graphql.schema.DataFetchingEnvironment;
  import graphql.schema.GraphQLOutputType;
  
  import static graphql.schema.GraphQLFieldDefinition.newFieldDefinition;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.core.metamodel.consent.Consent;
  import org.apache.causeway.core.metamodel.consent.InteractionInitiatedBy;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectAction;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectActionParameter;
  import org.apache.causeway.viewer.graphql.model.context.Context;
  import org.apache.causeway.viewer.graphql.model.domain.Element;
  import org.apache.causeway.viewer.graphql.model.domain.common.interactors.ActionInteractor;
  import org.apache.causeway.viewer.graphql.model.fetcher.BookmarkedPojo;
  import org.apache.causeway.viewer.graphql.model.types.TypeMapper;
  
  import lombok.extern.log4j.Log4j2;
  
  @Log4j2
  public class RichActionValidity extends Element {
  
      private final ActionInteractor actionInteractor;
  
      public RichActionValidity(
              final ActionInteractor actionInteractor,
              final Context context
      ) {
          super(context);
          this.actionInteractor = actionInteractor;
  
          var objectAction = actionInteractor.getObjectMember();
  
          var fieldBuilder = newFieldDefinition()
                  .name("validate")
                  .type((GraphQLOutputType) this.context.typeMapper.outputTypeFor(String.class));
  
          actionInteractor.addGqlArguments(objectAction, fieldBuilder, TypeMapper.InputContext.VALIDATE, objectAction.getParameterCount());
          setField(fieldBuilder.build());
      }
  
      @Override
      protected Object fetchData(final DataFetchingEnvironment dataFetchingEnvironment) {
  
          final ObjectAction objectAction = actionInteractor.getObjectMember();
  
          var sourcePojo = BookmarkedPojo.sourceFrom(dataFetchingEnvironment);
  
          var sourcePojoClass = sourcePojo.getClass();
          var specificationLoader = objectAction.getSpecificationLoader();
          var objectSpecification = specificationLoader.loadSpecification(sourcePojoClass);
          if (objectSpecification == null) {
              // not expected
              return null;
          }
  
          var managedObject = ManagedObject.adaptSingular(objectSpecification, sourcePojo);
          var actionInteractionHead = objectAction.interactionHead(managedObject);
  
          Map<String, Object> argumentPojos = dataFetchingEnvironment.getArguments();
          Can<ObjectActionParameter> parameters = objectAction.getParameters();
          Can<ManagedObject> argumentManagedObjects = parameters
                  .map(oap -> {
                      Object argumentValue = argumentPojos.get(oap.asciiId());
                      return ManagedObject.adaptParameter(oap, argumentValue);
                  });
  
          Consent consent = objectAction.isArgumentSetValid(actionInteractionHead, argumentManagedObjects, InteractionInitiatedBy.USER);
  
          return consent.isVetoed() ? consent.getReasonAsString().orElse("Invalid") : null;
      }
  
  }
  