content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.camel.component.geocoder;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Locale;
  import java.util.Map;
  
  import com.jayway.jsonpath.Configuration;
  import com.jayway.jsonpath.DocumentContext;
  import com.jayway.jsonpath.JsonPath;
  import com.jayway.jsonpath.Option;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.support.DefaultProducer;
  import org.apache.camel.util.StringHelper;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.classic.HttpClients;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.io.support.ClassicRequestBuilder;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The GeoCoder producer for Nominatim.
   */
  public class GeoCoderNominatimProducer extends DefaultProducer {
      private static final Logger LOG = LoggerFactory.getLogger(GeoCoderNominatimProducer.class);
  
      private final GeoCoderEndpoint endpoint;
      private final CloseableHttpClient httpClient = HttpClients.createDefault();
  
      public GeoCoderNominatimProducer(GeoCoderEndpoint endpoint) {
          super(endpoint);
          this.endpoint = endpoint;
      }
  
      @Override
      protected void doStop() throws Exception {
          httpClient.close();
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          // headers take precedence
          String address = exchange.getIn().getHeader(GeoCoderConstants.ADDRESS, String.class);
          if (address == null) {
              address = endpoint.getAddress();
          }
  
          String latlng = exchange.getIn().getHeader(GeoCoderConstants.LATLNG, String.class);
          if (latlng == null) {
              latlng = endpoint.getLatlng();
          }
  
          String geocoded = null;
  
          if (latlng != null) {
              String lat = StringHelper.before(latlng, ",");
              String lng = StringHelper.after(latlng, ",");
  
              LOG.debug("Geocode for lat/lng {}", latlng);
              geocoded = query(lat, lng);
          } else if (address != null) {
              LOG.debug("Geocode for address {}", address);
              geocoded = query(address);
          }
  
          LOG.debug("Geocode response {}", geocoded);
  
          extractResult(geocoded, exchange);
      }
  
      private String query(String dlat, String dlon) throws IOException {
  
          Map<String, String> params = new HashMap<>();
          params.put("format", "jsonv2");
          params.put("lat", dlat);
          params.put("lon", dlon);
  
          return queryForString("reverse", params);
      }
  
      private String query(String address) throws IOException {
          Map<String, String> params = new HashMap<>();
          params.put("format", "jsonv2");
          params.put("addressdetails", "1");
          params.put("q", address);
          params.put("limit", "1");
  
          return queryForString("search", params);
      }
  
      private String queryForString(String operation, Map<String, String> params) throws IOException {
          String url = endpoint.getServerUrl();
          if (!url.endsWith("/")) {
              url += "/";
          }
          url += operation;
  
          final ClassicRequestBuilder builder = ClassicRequestBuilder.get().setUri(url);
  
          for (Map.Entry<String, String> entry : params.entrySet()) {
              builder.addParameter(entry.getKey(), entry.getValue());
          }
  
          return httpClient.execute(builder.build(), resp -> EntityUtils.toString(resp.getEntity()));
      }
  
      protected void extractResult(String place, Exchange exchange) {
          if (!endpoint.isHeadersOnly()) {
              exchange.getIn().setBody(place);
          }
  
          if (place == null || place.isEmpty()) {
              exchange.getIn().setHeader(GeoCoderConstants.STATUS, GeocoderStatus.ZERO_RESULTS);
              return;
          }
          exchange.getIn().setHeader(GeoCoderConstants.STATUS, GeocoderStatus.OK);
  
          if (place.startsWith("[") && place.endsWith("]")) {
              place = place.substring(1, place.length() - 1);
          }
  
          // additional details
          final Configuration conf = Configuration.defaultConfiguration().addOptions(Option.SUPPRESS_EXCEPTIONS);
          final DocumentContext doc = JsonPath.using(conf).parse(place);
  
          exchange.getIn().setHeader(GeoCoderConstants.ADDRESS, doc.read("$['display_name']"));
  
          // just grab the first element and its lat and lon
          setLatLngToExchangeHeader(doc.read("$['lat']"), doc.read("$['lon']"), exchange);
  
          extractCountry(doc, exchange.getIn());
          extractCity(doc, exchange.getIn());
          extractPostalCode(doc, exchange.getIn());
          extractRegion(doc, exchange.getIn());
      }
  
      private void setLatLngToExchangeHeader(String resLat, String resLng, Exchange exchange) {
          if (resLat != null && resLng != null) {
              exchange.getIn().setHeader(GeoCoderConstants.LAT, formatLatOrLon(resLat));
              exchange.getIn().setHeader(GeoCoderConstants.LNG, formatLatOrLon(resLng));
              String resLatlng = formatLatOrLon(resLat) + ", " + formatLatOrLon(resLng);
              exchange.getIn().setHeader(GeoCoderConstants.LATLNG, resLatlng);
          }
      }
  
      private void extractCountry(DocumentContext doc, Message in) {
          String code = doc.read("$['address']['country_code']");
          if (code != null) {
              code = code.toUpperCase();
          }
          in.setHeader(GeoCoderConstants.COUNTRY_SHORT, code);
          in.setHeader(GeoCoderConstants.COUNTRY_LONG, doc.read("$['address']['country']"));
      }
  
      private void extractCity(DocumentContext doc, Message in) {
          in.setHeader(GeoCoderConstants.CITY, doc.read("$['address']['city']"));
      }
  
      private void extractPostalCode(DocumentContext doc, Message in) {
          in.setHeader(GeoCoderConstants.POSTAL_CODE, doc.read("$['address']['postcode']"));
      }
  
      private void extractRegion(DocumentContext doc, Message in) {
          String code = doc.read("$['address']['state_code']");
          if (code != null) {
              code = code.toUpperCase();
          }
          in.setHeader(GeoCoderConstants.REGION_CODE, code);
          in.setHeader(GeoCoderConstants.REGION_NAME, doc.read("$['address']['state']"));
      }
  
      private String formatLatOrLon(String value) {
          return String.format(Locale.ENGLISH, "%.8f", Double.parseDouble(value));
      }
  }
  