/*
    * Copyright 2015-2022 the original author or authors.
    *
    * Licensed under the Apache 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://www.apache.org/licenses/LICENSE-2.0
    *
   * 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.bremersee.geojson.converter.deserialization;
  
  import static java.util.Objects.isNull;
  
  import java.util.Map;
  import org.bremersee.geojson.GeoJsonGeometryFactory;
  import org.locationtech.jts.geom.Geometry;
  import org.locationtech.jts.geom.GeometryFactory;
  import tools.jackson.core.JsonParser;
  import tools.jackson.core.type.TypeReference;
  import tools.jackson.databind.DeserializationContext;
  import tools.jackson.databind.deser.std.StdDeserializer;
  
  /**
   * A Jackson deserializer for a {@link Geometry}.
   *
   * @author Christian Bremer
   */
  public class JacksonGeometryDeserializer extends StdDeserializer<Geometry> {
  
    /**
     * The json to geometry converter.
     */
    private final JsonToGeometryConverter geometryConverter;
  
    /**
     * Default constructor.
     */
    public JacksonGeometryDeserializer() {
      this(new GeometryFactory());
    }
  
    /**
     * Constructs a deserializer that uses the specified geometry factory.
     *
     * @param geometryFactory the geometry factory
     */
    public JacksonGeometryDeserializer(GeometryFactory geometryFactory) {
      super(Geometry.class);
      GeometryFactory gf = isNull(geometryFactory) ? new GeoJsonGeometryFactory() : geometryFactory;
      this.geometryConverter = new JsonToGeometryConverter(gf);
    }
  
    @Override
    public Geometry deserialize(JsonParser jp, DeserializationContext ctxt) {
      Map<String, Object> map = jp.readValueAs(new MapTypeReference());
      if (isNull(map) || map.isEmpty()) {
        return null;
      }
      return geometryConverter.convert(map);
    }
  
    private static class MapTypeReference extends TypeReference<Map<String, Object>> {
  
      private MapTypeReference() {
      }
    }
  }