/*
 * 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.beam.sdk.io.elasticsearch;

import static org.apache.beam.sdk.io.elasticsearch.ElasticsearchIO.ConnectionConfiguration;
import static org.apache.beam.sdk.io.elasticsearch.ElasticsearchIOTestCommon.ES_TYPE;
import static org.apache.beam.sdk.io.elasticsearch.ElasticsearchIOTestCommon.NUM_DOCS_ITESTS;
import static org.apache.beam.sdk.io.elasticsearch.ElasticsearchIOTestCommon.getEsIndex;

import org.apache.beam.sdk.options.Default;
import org.apache.beam.sdk.options.Description;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.testing.TestPipelineOptions;
import org.elasticsearch.client.RestClient;

/**
 * Manipulates test data used by the {@link ElasticsearchIO} integration tests.
 *
 * <p>This is independent from the tests so that for read tests it can be run separately after data
 * store creation rather than every time (which can be more fragile.)
 */
public class ElasticsearchIOITCommon {

  /** Pipeline options for elasticsearch tests. */
  public interface ElasticsearchPipelineOptions extends TestPipelineOptions {

    @Description("Server name for Elasticsearch server (host name/ip address)")
    @Default.String("elasticsearch-server-name")
    String getElasticsearchServer();

    void setElasticsearchServer(String value);

    @Description("Http port for elasticsearch server")
    @Default.Integer(9200)
    Integer getElasticsearchHttpPort();

    void setElasticsearchHttpPort(Integer value);
  }

  /** Enum encapsulating the mode of operation and the index. */
  enum IndexMode {
    READ(getEsIndex()),
    WRITE(getEsIndex() + System.currentTimeMillis()),
    WRITE_PARTIAL(getEsIndex() + "_partial_" + System.currentTimeMillis());

    private final String index;

    IndexMode(String index) {
      this.index = index;
    }

    public String getIndex() {
      return index;
    }
  }

  /**
   * Use this to create the index for reading before IT read tests.
   *
   * <p>To invoke this class, you can use this command line from elasticsearch-tests-common module
   * directory after setting the correct server IP:
   *
   * <pre>
   * mvn test-compile exec:java \
   * -Dexec.mainClass=org.apache.beam.sdk.io.elasticsearch.ElasticsearchIOITCommon \
   * -Dexec.args="--elasticsearchServer=127.0.0.1 \
   * --elasticsearchHttpPort=9200" \
   * -Dexec.classpathScope=test
   *   </pre>
   *
   * @param args Please pass options from ElasticsearchTestOptions used for connection to
   *     Elasticsearch as shown above.
   */
  public static void main(String[] args) throws Exception {
    PipelineOptionsFactory.register(ElasticsearchPipelineOptions.class);
    ElasticsearchPipelineOptions options =
        PipelineOptionsFactory.fromArgs(args).as(ElasticsearchPipelineOptions.class);
    createAndPopulateReadIndex(options);
  }

  private static void createAndPopulateReadIndex(ElasticsearchPipelineOptions options)
      throws Exception {
    // automatically creates the index and insert docs
    ConnectionConfiguration connectionConfiguration =
        getConnectionConfiguration(options, IndexMode.READ);
    try (RestClient restClient = connectionConfiguration.createClient()) {
      ElasticsearchIOTestUtils.insertTestDocuments(
          connectionConfiguration, NUM_DOCS_ITESTS, restClient);
    }
  }

  static ConnectionConfiguration getConnectionConfiguration(
      ElasticsearchPipelineOptions options, IndexMode mode) {
    return ConnectionConfiguration.create(
        new String[] {
          "http://" + options.getElasticsearchServer() + ":" + options.getElasticsearchHttpPort()
        },
        mode.getIndex(),
        ES_TYPE);
  }
}
