/*
 * 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.flume.sink.elasticsearch.client;

import org.apache.flume.sink.elasticsearch.ElasticSearchEventSerializer;
import org.apache.flume.sink.elasticsearch.ElasticSearchIndexRequestBuilderFactory;

/**
 * Internal ElasticSearch client factory. Responsible for creating instance
 * of ElasticSearch clients.
 */
public class ElasticSearchClientFactory {
  public static final String TransportClient = "transport";
  public static final String RestClient = "rest";

  /**
   *
   * @param clientType
   *    String representation of client type
   * @param hostNames
   *    Array of strings that represents hostnames with ports (hostname:port)
   * @param clusterName
   *    Elasticsearch cluster name used only by Transport Client
   * @param serializer
   *    Serializer of flume events to elasticsearch documents
   * @return
   */
  public ElasticSearchClient getClient(String clientType, String[] hostNames,
      String clusterName, ElasticSearchEventSerializer serializer,
      ElasticSearchIndexRequestBuilderFactory indexBuilder) throws NoSuchClientTypeException {
    if (clientType.equalsIgnoreCase(TransportClient) && serializer != null) {
      return new ElasticSearchTransportClient(hostNames, clusterName, serializer);
    } else if (clientType.equalsIgnoreCase(TransportClient) && indexBuilder != null) { 
      return new ElasticSearchTransportClient(hostNames, clusterName, indexBuilder);
    } else if (clientType.equalsIgnoreCase(RestClient) && serializer != null) {
      return new ElasticSearchRestClient(hostNames, serializer);
    }
    throw new NoSuchClientTypeException();
  }

  /**
   * Used for tests only. Creates local elasticsearch instance client.
   *
   * @param clientType Name of client to use
   * @param serializer Serializer for the event
   * @param indexBuilder Index builder factory
   *
   * @return Local elastic search instance client
   */
  public ElasticSearchClient getLocalClient(String clientType,
                                            ElasticSearchEventSerializer serializer,
                                            ElasticSearchIndexRequestBuilderFactory indexBuilder)
      throws NoSuchClientTypeException {
    if (clientType.equalsIgnoreCase(TransportClient) && serializer != null) {
      return new ElasticSearchTransportClient(serializer);
    } else if (clientType.equalsIgnoreCase(TransportClient) && indexBuilder != null)  {
      return new ElasticSearchTransportClient(indexBuilder);
    } else if (clientType.equalsIgnoreCase(RestClient)) {
    }
    throw new NoSuchClientTypeException();
  }
}
