/*
    * 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.Set;
  import java.util.stream.Stream;
  
  import dev.metaschema.core.model.IAssemblyInstance;
  import dev.metaschema.core.model.IAssemblyInstanceAbsolute;
  import dev.metaschema.core.model.IFlagInstance;
  import dev.metaschema.core.util.CollectionUtil;
  import dev.metaschema.core.util.ObjectUtils;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import nl.talsmasoftware.lazy4j.Lazy;
  
  /**
   * Supports generation of a JSON schema based on a Metaschema
   * {@link IAssemblyInstanceAbsolute}, which can be generated inline or as a JSON
   * schema definition.
   */
  public class JsonSchemaPropertyAssembly
      extends AbstractJsonSchemaPropertyNamed<IAssemblyInstanceAbsolute> {
    @NonNull
    private final Lazy<IJsonSchemaModelDefinition> definitionSchema;
    private final IFlagInstance jsonKey;
  
    /**
     * 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 JsonSchemaPropertyAssembly(
        @NonNull IAssemblyInstanceAbsolute instance,
        @NonNull IJsonGenerationState state) {
      super(instance, instance.getJsonName());
      this.jsonKey = instance.getJsonKey();
      this.definitionSchema = ObjectUtils.notNull(Lazy.of(() -> state.getAssemblyDefinition(
          instance.getDefinition(),
          jsonKey == null ? null : jsonKey.getQName())));
    }
  
    @Override
    public boolean isRequired() {
      return getInstance().getMinOccurs() > 0;
    }
  
    @NonNull
    private IJsonSchemaModelDefinition getDefinitionSchema() {
      return ObjectUtils.notNull(definitionSchema.get());
    }
  
    @Override
    protected void generateMetadata(ObjectNode obj, IJsonGenerationState state) {
      IAssemblyInstance instance = getInstance();
      JsonSchemaHelper.generateTitle(instance, obj);
      JsonSchemaHelper.generateDescription(instance, obj);
    }
  
    @Override
    protected void generateBody(ObjectNode obj, IJsonGenerationState state) {
      ICardinalityBehavior.behaviorFor(getInstance())
          .generate(obj, getInstance(), CollectionUtil.singleton(getDefinitionSchema()), state);
      assert !obj.isEmpty();
    }
  
    @Override
    public Stream<IJsonSchemaDefinable> collectDefinitions(
        Set<IJsonSchemaDefinitionAssembly> visited,
        IJsonGenerationState state) {
      return getDefinitionSchema().collectDefinitions(visited, state);
    }
  }