/*
 * 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.hadoop.ozone;

import java.io.Closeable;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdds.conf.OzoneConfiguration;
import org.apache.hadoop.hdds.protocol.DatanodeDetails;
import org.apache.hadoop.hdds.ratis.RatisHelper;
import org.apache.hadoop.hdds.scm.client.HddsClientUtils;
import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
import org.apache.hadoop.ozone.client.protocol.ClientProtocol;
import org.apache.hadoop.ozone.client.rpc.RpcClient;

import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_CONTAINER_REPORT_INTERVAL;
import static org.apache.hadoop.hdds.ratis.RatisHelper.newRaftClient;
import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_STALENODE_INTERVAL;
import org.apache.ratis.client.RaftClient;
import org.apache.ratis.protocol.RaftPeer;
import org.apache.ratis.rpc.RpcType;
import org.apache.ratis.rpc.SupportedRpcType;
import org.apache.ratis.util.TimeDuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Helpers for Ratis tests.
 */
public interface RatisTestHelper {
  Logger LOG = LoggerFactory.getLogger(RatisTestHelper.class);

  /** For testing Ozone with Ratis. */
  class RatisTestSuite implements Closeable {
    static final RpcType RPC = SupportedRpcType.GRPC;
    static final int NUM_DATANODES = 3;

    private final OzoneConfiguration conf;
    private final MiniOzoneCluster cluster;

    /**
     * Create a {@link MiniOzoneCluster} for testing by setting.
     *   OZONE_ENABLED = true
     *   RATIS_ENABLED = true
     */
    public RatisTestSuite()
        throws IOException, TimeoutException, InterruptedException {
      conf = newOzoneConfiguration(RPC);

      cluster = newMiniOzoneCluster(NUM_DATANODES, conf);
    }

    public OzoneConfiguration getConf() {
      return conf;
    }

    public MiniOzoneCluster getCluster() {
      return cluster;
    }

    public ClientProtocol newOzoneClient()
        throws IOException {
      return new RpcClient(conf, null);
    }

    @Override
    public void close() {
      cluster.shutdown();
    }

    public int getDatanodeOzoneRestPort() {
      return cluster.getHddsDatanodes().get(0).getDatanodeDetails()
          .getPort(DatanodeDetails.Port.Name.REST).getValue();
    }
  }

  static OzoneConfiguration newOzoneConfiguration(RpcType rpc) {
    final OzoneConfiguration conf = new OzoneConfiguration();
    initRatisConf(rpc, conf);
    return conf;
  }

  static void initRatisConf(RpcType rpc, Configuration conf) {
    conf.setBoolean(OzoneConfigKeys.DFS_CONTAINER_RATIS_ENABLED_KEY, true);
    conf.set(OzoneConfigKeys.DFS_CONTAINER_RATIS_RPC_TYPE_KEY, rpc.name());
    conf.setTimeDuration(HDDS_CONTAINER_REPORT_INTERVAL, 1, TimeUnit.SECONDS);
    conf.setTimeDuration(OZONE_SCM_STALENODE_INTERVAL, 30, TimeUnit.SECONDS);
    LOG.info(OzoneConfigKeys.DFS_CONTAINER_RATIS_RPC_TYPE_KEY
        + " = " + rpc.name());
  }

  static MiniOzoneCluster newMiniOzoneCluster(
      int numDatanodes, OzoneConfiguration conf)
      throws IOException, TimeoutException, InterruptedException {
    final MiniOzoneCluster cluster = MiniOzoneCluster.newBuilder(conf)
        .setHbInterval(1000)
        .setHbProcessorInterval(1000)
        .setNumDatanodes(numDatanodes).build();
    cluster.waitForClusterToBeReady();
    return cluster;
  }

  static void initXceiverServerRatis(
      RpcType rpc, DatanodeDetails dd, Pipeline pipeline) throws IOException {
    final RaftPeer p = RatisHelper.toRaftPeer(dd);
    final OzoneConfiguration conf = new OzoneConfiguration();
    final int maxOutstandingRequests =
        HddsClientUtils.getMaxOutstandingRequests(conf);
    final TimeDuration requestTimeout =
        RatisHelper.getClientRequestTimeout(conf);
    final RaftClient client =
        newRaftClient(rpc, p, RatisHelper.createRetryPolicy(conf),
            maxOutstandingRequests, requestTimeout);
    client.groupAdd(RatisHelper.newRaftGroup(pipeline), p.getId());
  }
}