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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.common.query;
  
  import graphql.schema.DataFetchingEnvironment;
  
  import org.apache.causeway.applib.services.metamodel.BeanSort;
  import org.apache.causeway.core.config.CausewayConfiguration;
  import org.apache.causeway.viewer.graphql.model.context.Context;
  import org.apache.causeway.viewer.graphql.model.domain.ElementCustom;
  import org.apache.causeway.viewer.graphql.model.domain.TypeNames;
  import org.apache.causeway.viewer.graphql.model.domain.common.interactors.ObjectInteractor;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaCssClass;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaFetcher;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaGrid;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaIcon;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaId;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaLayout;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaLogicalTypeName;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaSaveAs;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaTitle;
  import org.apache.causeway.viewer.graphql.model.domain.common.query.meta.CommonMetaVersion;
  
  public class CommonMeta extends ElementCustom {
  
      private final ObjectInteractor holder;
      private final CommonMetaId metaId;
      private final CommonMetaLogicalTypeName metaLogicalTypeName;
      private final CommonMetaVersion metaVersion;
      private final CommonMetaTitle metaTitle;
      private final CommonMetaIcon metaIcon;
      private final CommonMetaCssClass metaCssClass;
      private final CommonMetaLayout metaLayout;
      private final CommonMetaGrid metaGrid;
      private final CommonMetaSaveAs metaSaveAs;
  
      private final CausewayConfiguration.Viewer.Graphql graphqlConfiguration;
  
      public CommonMeta(
              final ObjectInteractor objectInteractor,
              final Context context
      ) {
          super(TypeNames.metaTypeNameFor(objectInteractor.getObjectSpecification(), objectInteractor.getSchemaType()), context);
          this.holder = objectInteractor;
  
          this.graphqlConfiguration = context.causewayConfiguration.getViewer().getGraphql();
  
          if(isBuilt()) {
              this.metaId = null;
              this.metaLogicalTypeName = null;
              this.metaVersion = null;
              this.metaTitle = null;
              this.metaIcon = null;
              this.metaCssClass = null;
              this.metaLayout = null;
              this.metaGrid = null;
              this.metaSaveAs = null;
              return;
          }
  
          addChildFieldFor(this.metaId = new CommonMetaId(context));
          addChildFieldFor(this.metaLogicalTypeName = new CommonMetaLogicalTypeName(context));
          addChildFieldFor(this.metaVersion = isEntity() ? new CommonMetaVersion(context) : null);
          addChildFieldFor(this.metaTitle = new CommonMetaTitle(context));
          addChildFieldFor(this.metaCssClass = new CommonMetaCssClass(context));
          addChildFieldFor(this.metaLayout = new CommonMetaLayout(context));
          addChildFieldFor(this.metaSaveAs = new CommonMetaSaveAs(context));
  
          addChildFieldFor(this.metaIcon = isResourceNotForbidden() ? new CommonMetaIcon(context) : null);
          addChildFieldFor(this.metaGrid = isResourceNotForbidden() ? new CommonMetaGrid(context) : null);
  
          var fieldName = graphqlConfiguration.getMetaData().getFieldName();
          buildObjectTypeAndField(fieldName, "Object metadata");
      }
  
      private boolean isResourceNotForbidden() {
          return graphqlConfiguration.getResources().getResponseType() != CausewayConfiguration.Viewer.Graphql.ResponseType.FORBIDDEN;
      }
  
      private boolean isEntity() {
          return holder.getObjectSpecification().getBeanSort() == BeanSort.ENTITY;
      }
  
      @Override
      protected void addDataFetchersForChildren() {
          if (metaId == null) {
              // none of the fields will have been initialized
              return;
          }
          metaId.addDataFetcher(this);
          metaLogicalTypeName.addDataFetcher(this);
          if (isEntity()) {
              metaVersion.addDataFetcher(this);
          }
          metaTitle.addDataFetcher(this);
          metaCssClass.addDataFetcher(this);
          metaLayout.addDataFetcher(this);
          metaSaveAs.addDataFetcher(this);
          if (metaGrid != null) {
              metaGrid.addDataFetcher(this);
          }
          if (metaIcon != null) {
              metaIcon.addDataFetcher(this);
          }
      }
  
      @Override
      public Object fetchData(final DataFetchingEnvironment environment) {
          return context.bookmarkService.bookmarkFor(environment.getSource())
                  .map(bookmark -> new CommonMetaFetcher(bookmark, context.bookmarkService, context.objectManager, context.causewayConfiguration))
                  .orElseThrow();
      }
  
  }
  