/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package gov.nist.secauto.metaschema.databind.io.json;
   
   import com.fasterxml.jackson.core.JsonFactory;
   import com.fasterxml.jackson.core.JsonGenerator;
  import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
  
  import gov.nist.secauto.metaschema.core.configuration.IMutableConfiguration;
  import gov.nist.secauto.metaschema.core.model.IBoundObject;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  import gov.nist.secauto.metaschema.databind.io.AbstractSerializer;
  import gov.nist.secauto.metaschema.databind.io.SerializationFeature;
  import gov.nist.secauto.metaschema.databind.model.IBoundDefinitionModelAssembly;
  
  import java.io.IOException;
  import java.io.Writer;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  public class DefaultJsonSerializer<CLASS extends IBoundObject>
      extends AbstractSerializer<CLASS> {
    private JsonFactory jsonFactory;
  
    /**
     * Construct a new Module binding-based deserializer that reads JSON-based
     * Module content.
     *
     * @param definition
     *          the assembly class binding describing the Java objects this
     *          deserializer parses data into
     */
    public DefaultJsonSerializer(@NonNull IBoundDefinitionModelAssembly definition) {
      super(definition);
    }
  
    /**
     * Constructs a new JSON factory.
     * <p>
     * Subclasses can override this method to create a JSON factory with a specific
     * configuration.
     *
     * @return the factory
     */
    @NonNull
    protected JsonFactory getJsonFactoryInstance() {
      return JsonFactoryFactory.instance();
    }
  
    @SuppressWarnings("PMD.NullAssignment")
    @Override
    protected void configurationChanged(IMutableConfiguration<SerializationFeature<?>> config) {
      synchronized (this) {
        jsonFactory = null;
      }
    }
  
    @NonNull
    private JsonFactory getJsonFactory() {
      synchronized (this) {
        if (jsonFactory == null) {
          jsonFactory = getJsonFactoryInstance();
        }
        assert jsonFactory != null;
        return jsonFactory;
      }
    }
  
    @SuppressWarnings("resource")
    @NonNull
    private JsonGenerator newJsonGenerator(@NonNull Writer writer) throws IOException {
      JsonFactory factory = getJsonFactory();
      return ObjectUtils.notNull(factory.createGenerator(writer)
          .setPrettyPrinter(new DefaultPrettyPrinter()));
    }
  
    @Override
    public void serialize(IBoundObject data, Writer writer) throws IOException {
      try (JsonGenerator generator = newJsonGenerator(writer)) {
        IBoundDefinitionModelAssembly definition = getDefinition();
  
        boolean serializeRoot = get(SerializationFeature.SERIALIZE_ROOT);
        if (serializeRoot) {
          // first write the initial START_OBJECT
          generator.writeStartObject();
  
          generator.writeFieldName(definition.getRootJsonName());
        }
  
        MetaschemaJsonWriter jsonWriter = new MetaschemaJsonWriter(generator);
        jsonWriter.write(definition, data);
  
        if (serializeRoot) {
          generator.writeEndObject();
        }
      }
   }
 }