/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package dev.metaschema.schemagen.json.impl;
   
   import com.fasterxml.jackson.databind.node.ObjectNode;
   
  import java.util.List;
  import java.util.Set;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import dev.metaschema.core.model.IChoiceGroupInstance;
  import dev.metaschema.core.util.ObjectUtils;
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  /**
   * Supports generation of a JSON schema based on a Metaschema
   * {@link IChoiceGroupInstance}, which can be generated inline or as a JSON
   * schema definition.
   */
  public class JsonSchemaPropertyChoiceGroup
      extends AbstractJsonSchemaPropertyNamed<IChoiceGroupInstance> {
    @NonNull
    private final List<IJsonSchemaPropertyGrouped> choiceInstances;
  
    /**
     * Construct a new JSON schema property.
     *
     * @param instance
     *          the instance to construct the property for
     * @param state
     *          the JSON generation state used to get JSON schema information
     */
    public JsonSchemaPropertyChoiceGroup(
        @NonNull IChoiceGroupInstance instance,
        @NonNull IJsonGenerationState state) {
      super(instance, instance.getGroupAsName() == null ? "[unknown]" : ObjectUtils.notNull(instance.getGroupAsName()));
      this.choiceInstances = ObjectUtils.notNull(instance.getNamedModelInstances().stream()
          .map(state::getJsonSchemaPropertyGrouped)
          .collect(Collectors.toUnmodifiableList()));
    }
  
    @Override
    public boolean isRequired() {
      return getInstance().getMinOccurs() > 0;
    }
  
    @Override
    public Stream<IJsonSchemaDefinable> collectDefinitions(
        Set<IJsonSchemaDefinitionAssembly> visited,
        IJsonGenerationState state) {
      return ObjectUtils.notNull(choiceInstances.stream()
          .flatMap(choice -> choice.collectDefinitions(visited, state)));
    }
  
    @Override
    protected void generateMetadata(ObjectNode obj, IJsonGenerationState state) {
      // do nothing
    }
  
    @Override
    protected void generateBody(ObjectNode obj, IJsonGenerationState state) {
      ICardinalityBehavior.behaviorFor(getInstance())
          .generate(obj, getInstance(), choiceInstances, state);
      assert !obj.isEmpty();
    }
  }