/*
    * 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.Stream;
  
  import dev.metaschema.core.model.IFlagInstance;
  import dev.metaschema.core.model.IModelDefinition;
  import dev.metaschema.core.model.INamedModelInstanceGrouped;
  import dev.metaschema.core.qname.IEnhancedQName;
  import dev.metaschema.core.util.ObjectUtils;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import nl.talsmasoftware.lazy4j.Lazy;
  
  /**
   * A JSON schema for a given Metaschema-based definition instance, that is part
   * of a choice group, which is part of a larger JSON schema.
   *
   * @param <I>
   *          the Java type of the Metaschema definition instance
   */
  public abstract class AbstractJsonSchemaPropertyGrouped<I extends INamedModelInstanceGrouped>
      extends AbstractJsonSchemaProperty<I>
      implements IJsonSchemaPropertyGrouped {
    @NonNull
    private final Lazy<String> definitionName;
    @NonNull
    private final List<IJsonSchemaPropertyFlag> flagProperties;
    private final IFlagInstance jsonKey;
  
    /**
     * Construct a new JSON schema property based on a Metaschema definition
     * instance.
     *
     * @param instance
     *          the Metaschema definition instance
     * @param state
     *          the generation state used to generate this JSON schema
     */
    protected AbstractJsonSchemaPropertyGrouped(@NonNull I instance, @NonNull IJsonGenerationState state) {
      super(instance);
      this.definitionName = ObjectUtils.notNull(Lazy.of(() -> getDefinitionName(state)));
      this.jsonKey = instance.getJsonKey();
  
      IEnhancedQName jsonKeyName = this.jsonKey == null ? null : this.jsonKey.getQName();
      this.flagProperties
          = JsonSchemaHelper.buildFlagProperties(instance.getDefinition(), jsonKeyName, state);
    }
  
    @Override
    public final List<IJsonSchemaPropertyFlag> getFlagProperties() {
      return flagProperties;
    }
  
    @Override
    public IFlagInstance getJsonKeyFlag() {
      return jsonKey;
    }
  
    @Override
    public String getDefinitionName() {
      return ObjectUtils.notNull(definitionName.get());
    }
  
    private String getDefinitionName(IJsonGenerationState state) {
      INamedModelInstanceGrouped instance = getInstance();
      IModelDefinition definition = instance.getDefinition();
  
      String discriminatorProperty = instance.getParentContainer().getJsonDiscriminatorProperty();
      String discriminatorValue = instance.getEffectiveDisciminatorValue();
  
      IFlagInstance jsonKey = getJsonKeyFlag();
  
      return state.generateJsonSchemaDefinitionName(
          definition,
          jsonKey == null ? null : jsonKey.getEffectiveName(),
          ObjectUtils.requireNonNull(discriminatorProperty),
          ObjectUtils.requireNonNull(discriminatorValue),
          "Choice");
    }
  
    @Override
    public Stream<IJsonSchemaDefinable> collectDefinitions(
        Set<IJsonSchemaDefinitionAssembly> visited,
        IJsonGenerationState state) {
      Stream<IJsonSchemaDefinable> retval = Stream.concat(
          Stream.of(this),
          getFlagProperties().stream()
              .flatMap(property -> property.collectDefinitions(visited, state)));
  
      IFlagInstance jsonKeyFlag = getJsonKeyFlag();
      if (jsonKeyFlag != null) {
       retval = Stream.concat(retval, Stream.of(state.getFlagDefinition(jsonKeyFlag.getDefinition())));
     }
     return ObjectUtils.notNull(retval);
 
   }
 
   /**
    * Represents a JSON schema property used to declare the type of a choice group
    * object.
    */
   protected class DiscriminatorProperty implements IJsonSchemaPropertyNamed {
     @Override
     public Stream<IJsonSchemaDefinable> collectDefinitions(Set<IJsonSchemaDefinitionAssembly> visited,
         IJsonGenerationState state) {
       return ObjectUtils.notNull(Stream.empty());
     }
 
     @Override
     public void generate(ObjectNode node, IJsonGenerationState state) {
       node.put("const", getInstance().getEffectiveDisciminatorValue());
     }
 
     @Override
     public String getName() {
       return getInstance().getParentContainer().getJsonDiscriminatorProperty();
     }
 
     @Override
     public boolean isRequired() {
       return true;
     }
   }
 }