/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community 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://opensource.org/licenses/ecl2.txt
   *
   * 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.opencastproject.graphql.command;
  
  import org.opencastproject.authorization.xacml.manager.api.AclService;
  import org.opencastproject.authorization.xacml.manager.api.AclServiceFactory;
  import org.opencastproject.elasticsearch.api.SearchIndexException;
  import org.opencastproject.elasticsearch.index.ElasticsearchIndex;
  import org.opencastproject.graphql.event.GqlEvent;
  import org.opencastproject.graphql.exception.GraphQLNotFoundException;
  import org.opencastproject.graphql.exception.GraphQLRuntimeException;
  import org.opencastproject.graphql.exception.GraphQLUnauthorizedException;
  import org.opencastproject.graphql.execution.context.OpencastContext;
  import org.opencastproject.graphql.execution.context.OpencastContextManager;
  import org.opencastproject.graphql.type.input.AccessControlListInput;
  import org.opencastproject.graphql.type.input.GqlCommonEventMetadataInput;
  import org.opencastproject.graphql.util.GraphQLObjectMapper;
  import org.opencastproject.graphql.util.MetadataFieldToGraphQLConverter;
  import org.opencastproject.index.service.api.IndexService;
  import org.opencastproject.index.service.catalog.adapter.events.CommonEventCatalogUIAdapter;
  import org.opencastproject.index.service.exception.IndexServiceException;
  import org.opencastproject.mediapackage.MediaPackageElementFlavor;
  import org.opencastproject.metadata.dublincore.DublinCoreMetadataCollection;
  import org.opencastproject.metadata.dublincore.MetadataField;
  import org.opencastproject.metadata.dublincore.MetadataList;
  import org.opencastproject.security.api.AccessControlEntry;
  import org.opencastproject.security.api.AccessControlList;
  import org.opencastproject.security.api.SecurityService;
  import org.opencastproject.security.api.UnauthorizedException;
  import org.opencastproject.util.NotFoundException;
  
  
  import java.time.Duration;
  import java.time.OffsetDateTime;
  import java.time.format.DateTimeFormatter;
  import java.util.Map;
  
  import graphql.schema.GraphQLScalarType;
  import graphql.schema.GraphQLTypeUtil;
  
  public class UpdateEventCommand extends AbstractCommand<GqlEvent> {
  
    private final String eventId;
  
    public UpdateEventCommand(final Builder builder) {
      super(builder);
      this.eventId = builder.eventId;
    }
  
    @Override
    public GqlEvent execute() {
      OpencastContext context = OpencastContextManager.getCurrentContext();
      final ElasticsearchIndex index = context.getService(ElasticsearchIndex.class);
      final IndexService indexService = context.getService(IndexService.class);
  
      final Map<String, Object> eventMetadata = environment.getArgument("metadata");
      try {
        indexService.updateEventMetadata(eventId, createMetadataList(eventMetadata, indexService), index);
      } catch (IndexServiceException | SearchIndexException e) {
        throw new GraphQLRuntimeException(e);
      } catch (UnauthorizedException e) {
        throw new GraphQLUnauthorizedException(e.getMessage());
      } catch (NotFoundException e) {
        throw new GraphQLNotFoundException(e.getMessage());
      }
  
      final AccessControlListInput aclInput = GraphQLObjectMapper.newInstance()
          .convertValue(environment.getArgument("acl"), AccessControlListInput.class);
      if (aclInput != null) {
        try {
          AccessControlList acl = new AccessControlList();
          for (var entry : aclInput.getEntries()) {
            for (var action : entry.getAction()) {
              acl.getEntries().add(new AccessControlEntry(entry.getRole(), action, true));
            }
          }
  
          if (aclInput.getManagedAclId() != null) {
            AclService aclService = context.getService(AclServiceFactory.class)
                                           .serviceFor(context.getService(SecurityService.class).getOrganization());
           aclService.getAcl(aclInput.getManagedAclId())
                     .ifPresent(value -> acl.merge(value.getAcl()));
         }
         indexService.updateEventAcl(eventId, acl, index);
       } catch (IndexServiceException | SearchIndexException e) {
         throw new GraphQLRuntimeException(e);
       } catch (UnauthorizedException e) {
         throw new GraphQLUnauthorizedException(e.getMessage());
       } catch (NotFoundException e) {
         throw new GraphQLNotFoundException(e.getMessage());
       }
     }
 
     try {
       return new GqlEvent(indexService.getEvent(eventId, index).get());
     } catch (SearchIndexException e) {
       throw new GraphQLRuntimeException(e);
     }
   }
 
   private MetadataList createMetadataList(
       Map<String, Object> eventMetadata,
       IndexService indexService
   ) {
     CommonEventCatalogUIAdapter adapter = (CommonEventCatalogUIAdapter) indexService
         .getCommonEventCatalogUIAdapter();
 
     MetadataList list = new MetadataList();
     list.add(adapter, adapter.getRawFields());
 
     final MediaPackageElementFlavor flavor = MediaPackageElementFlavor
         .parseFlavor("dublincore/episode");
 
     final DublinCoreMetadataCollection collection = list.getMetadataByFlavor(flavor.toString());
 
     for (Map.Entry<String, Object> entry: eventMetadata.entrySet()) {
       String key = entry.getKey();
       final MetadataField target = collection.getOutputFields().get(key);
       var type = GraphQLTypeUtil.unwrapNonNull(MetadataFieldToGraphQLConverter.convertType(target));
 
       Object value;
       if (type instanceof GraphQLScalarType) {
         value = ((GraphQLScalarType)type).getCoercing()
             .parseValue(eventMetadata.get(key), environment.getGraphQlContext(), environment.getLocale());
       } else {
         value = eventMetadata.get(key);
       }
 
       if (value == null) {
         continue;
       }
 
       switch (target.getType()) {
         case DATE:
         case START_DATE:
           target.setValue(DateTimeFormatter.ofPattern(target.getPattern()).format((OffsetDateTime)value));
           break;
         case LONG:
           target.setValue(value);
           break;
         case TEXT:
           target.setValue(value);
           break;
         case BOOLEAN:
           target.setValue(value);
           break;
         case DURATION:
           target.setValue(((Duration) value).toMillis());
           break;
         case TEXT_LONG:
           target.setValue(value);
           break;
         case MIXED_TEXT:
           target.setValue(value);
           break;
         case START_TIME:
           target.setValue(value);
           break;
         case ORDERED_TEXT:
           target.setValue(value);
           break;
         case ITERABLE_TEXT:
           target.setValue(value);
           break;
         default:
           target.setValue(value);
           break;
       }
     }
 
     return list;
   }
 
   public static Builder create(String eventId, GqlCommonEventMetadataInput eventMetadataInput) {
     return new Builder(eventId, eventMetadataInput);
   }
 
   public static class Builder extends AbstractCommand.Builder<GqlEvent> {
 
     private final String eventId;
 
     private final GqlCommonEventMetadataInput eventMetadataInput;
 
     public Builder(String eventId, GqlCommonEventMetadataInput eventMetadataInput) {
       this.eventId = eventId;
       this.eventMetadataInput = eventMetadataInput;
     }
 
     @Override
     public void validate() {
       super.validate();
       if (eventId == null || eventId.isEmpty()) {
         throw new IllegalStateException("Event ID cannot be null or empty");
       }
       if (eventMetadataInput == null) {
         throw new IllegalStateException("Event metadata cannot be null");
       }
     }
 
     @Override
     public UpdateEventCommand build() {
       validate();
       return new UpdateEventCommand(this);
     }
   }
 
 }