/*
    * 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.syncope.client.console.rest;
  
  import com.fasterxml.jackson.databind.json.JsonMapper;
  import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
  import java.util.List;
  import javax.ws.rs.core.MediaType;
  import javax.ws.rs.core.Response;
  import org.apache.commons.lang3.tuple.Pair;
  import org.apache.cxf.jaxrs.client.WebClient;
  import org.apache.syncope.client.console.SyncopeWebApplication;
  import org.apache.syncope.common.keymaster.client.api.model.NetworkService;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public final class SRAStatisticsRestClient {
  
      private static final Logger LOG = LoggerFactory.getLogger(SRAStatisticsRestClient.class);
  
      private static final List<?> JAX_RS_PROVIDERS =
              List.of(new JacksonJsonProvider(JsonMapper.builder().findAndAddModules().build()));
  
      protected String getActuatorEndpoint(final List<NetworkService> instances) {
          return instances.get(0).getAddress() + "actuator/metrics/spring.cloud.gateway.requests";
      }
  
      public SRAStatistics get(final List<NetworkService> instances, final List<Pair<String, String>> selected) {
          try {
              WebClient client = WebClient.create(
                      getActuatorEndpoint(instances),
                      JAX_RS_PROVIDERS,
                      SyncopeWebApplication.get().getAnonymousUser(),
                      SyncopeWebApplication.get().getAnonymousKey(),
                      null).
                      accept(MediaType.APPLICATION_JSON_TYPE);
  
              if (!selected.isEmpty()) {
                  client.query("tag", selected.stream().map(s -> s.getKey() + ":" + s.getValue()).toArray());
              }
  
              Response response = client.get();
              if (response.getStatus() == Response.Status.OK.getStatusCode()) {
                  return response.readEntity(SRAStatistics.class);
              }
  
              LOG.error("Unexpected response for SRA statistics from {}: {}",
                      getActuatorEndpoint(instances), response.getStatus());
          } catch (Exception e) {
              LOG.error("Could not fetch SRA statistics from {}", getActuatorEndpoint(instances), e);
          }
  
          return new SRAStatistics();
      }
  }