/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.client.rpc;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;

import org.apache.hadoop.hdds.client.ReplicationFactor;
import org.apache.hadoop.hdds.client.ReplicationType;
import org.apache.hadoop.hdds.conf.OzoneConfiguration;
import org.apache.hadoop.hdds.protocol.DatanodeDetails;
import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
import org.apache.hadoop.hdds.scm.ScmConfigKeys;
import org.apache.hadoop.hdds.scm.XceiverClientFactory;
import org.apache.hadoop.hdds.scm.XceiverClientRatis;
import org.apache.hadoop.hdds.scm.XceiverClientSpi;
import org.apache.hadoop.hdds.scm.container.ContainerID;
import org.apache.hadoop.hdds.scm.container.ContainerInfo;
import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolClientSideTranslatorPB;
import org.apache.hadoop.ozone.MiniOzoneCluster;
import org.apache.hadoop.ozone.client.ObjectStore;
import org.apache.hadoop.ozone.client.OzoneBucket;
import org.apache.hadoop.ozone.client.OzoneClient;
import org.apache.hadoop.ozone.client.OzoneClientFactory;
import org.apache.hadoop.ozone.client.OzoneKey;
import org.apache.hadoop.ozone.client.OzoneKeyDetails;
import org.apache.hadoop.ozone.client.OzoneKeyLocation;
import org.apache.hadoop.ozone.client.OzoneVolume;
import org.apache.hadoop.ozone.client.io.KeyOutputStream;
import org.apache.hadoop.ozone.client.io.OzoneInputStream;
import org.apache.hadoop.ozone.client.io.OzoneOutputStream;
import org.apache.hadoop.ozone.om.OzoneManager;
import org.apache.hadoop.ozone.om.helpers.OmKeyArgs;
import org.apache.hadoop.ozone.om.helpers.OmKeyLocationInfo;

import org.junit.AfterClass;
import org.junit.Assert;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.fail;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.rules.Timeout;

/**
 * Test read retries from multiple nodes in the pipeline.
 */
public class TestReadRetries {

  /**
    * Set a timeout for each test.
    */
  @Rule
  public Timeout timeout = Timeout.seconds(300);

  @Rule
  public ExpectedException thrown = ExpectedException.none();

  private static MiniOzoneCluster cluster = null;
  private static OzoneClient ozClient = null;
  private static ObjectStore store = null;
  private static OzoneManager ozoneManager;
  private static StorageContainerLocationProtocolClientSideTranslatorPB
      storageContainerLocationClient;

  private static final String SCM_ID = UUID.randomUUID().toString();


  /**
   * Create a MiniOzoneCluster for testing.
   * @throws Exception
   */
  @BeforeClass
  public static void init() throws Exception {
    OzoneConfiguration conf = new OzoneConfiguration();
    conf.setInt(ScmConfigKeys.OZONE_SCM_PIPELINE_OWNER_CONTAINER_COUNT, 1);
    cluster = MiniOzoneCluster.newBuilder(conf)
        .setNumDatanodes(3)
        .setScmId(SCM_ID)
        .build();
    cluster.waitForClusterToBeReady();
    cluster.waitForPipelineTobeReady(HddsProtos.ReplicationFactor.THREE,
            180000);
    ozClient = OzoneClientFactory.getRpcClient(conf);
    store = ozClient.getObjectStore();
    storageContainerLocationClient =
        cluster.getStorageContainerLocationClient();
    ozoneManager = cluster.getOzoneManager();
  }


  /**
   * Close OzoneClient and shutdown MiniOzoneCluster.
   */
  @AfterClass
  public static void shutdown() throws IOException {
    if(ozClient != null) {
      ozClient.close();
    }

    if (storageContainerLocationClient != null) {
      storageContainerLocationClient.close();
    }

    if (cluster != null) {
      cluster.shutdown();
    }
  }


  @Test
  public void testPutKeyAndGetKeyThreeNodes()
      throws Exception {
    String volumeName = UUID.randomUUID().toString();
    String bucketName = UUID.randomUUID().toString();

    String value = "sample value";
    store.createVolume(volumeName);
    OzoneVolume volume = store.getVolume(volumeName);
    volume.createBucket(bucketName);
    OzoneBucket bucket = volume.getBucket(bucketName);

    String keyName = UUID.randomUUID().toString();

    OzoneOutputStream out = bucket
        .createKey(keyName, value.getBytes(UTF_8).length, ReplicationType.RATIS,
            ReplicationFactor.THREE, new HashMap<>());
    KeyOutputStream groupOutputStream =
        (KeyOutputStream) out.getOutputStream();
    XceiverClientFactory factory = groupOutputStream.getXceiverClientFactory();
    out.write(value.getBytes(UTF_8));
    out.close();
    // First, confirm the key info from the client matches the info in OM.
    OmKeyArgs.Builder builder = new OmKeyArgs.Builder();
    builder.setVolumeName(volumeName).setBucketName(bucketName)
        .setKeyName(keyName).setRefreshPipeline(true);
    OmKeyLocationInfo keyInfo = ozoneManager.lookupKey(builder.build()).
        getKeyLocationVersions().get(0).getBlocksLatestVersionOnly().get(0);
    long containerID = keyInfo.getContainerID();
    long localID = keyInfo.getLocalID();
    OzoneKeyDetails keyDetails = bucket.getKey(keyName);
    Assert.assertEquals(keyName, keyDetails.getName());

    List<OzoneKeyLocation> keyLocations = keyDetails.getOzoneKeyLocations();
    Assert.assertEquals(1, keyLocations.size());
    Assert.assertEquals(containerID, keyLocations.get(0).getContainerID());
    Assert.assertEquals(localID, keyLocations.get(0).getLocalID());

    // Make sure that the data size matched.
    Assert.assertEquals(value.getBytes(UTF_8).length,
        keyLocations.get(0).getLength());

    ContainerInfo container = cluster.getStorageContainerManager()
        .getContainerManager().getContainer(ContainerID.valueof(containerID));
    Pipeline pipeline = cluster.getStorageContainerManager()
        .getPipelineManager().getPipeline(container.getPipelineID());
    List<DatanodeDetails> datanodes = pipeline.getNodes();

    DatanodeDetails datanodeDetails = datanodes.get(0);
    Assert.assertNotNull(datanodeDetails);

    XceiverClientSpi clientSpi = factory.acquireClient(pipeline);
    Assert.assertTrue(clientSpi instanceof XceiverClientRatis);
    XceiverClientRatis ratisClient = (XceiverClientRatis)clientSpi;

    ratisClient.watchForCommit(keyInfo.getBlockCommitSequenceId());
    // shutdown the datanode
    cluster.shutdownHddsDatanode(datanodeDetails);
    // try to read, this should be successful
    readKey(bucket, keyName, value);
    // shutdown the second datanode
    datanodeDetails = datanodes.get(1);
    cluster.shutdownHddsDatanode(datanodeDetails);

    // we still should be able to read via Standalone protocol
    // try to read
    readKey(bucket, keyName, value);

    // shutdown the 3rd datanode
    datanodeDetails = datanodes.get(2);
    cluster.shutdownHddsDatanode(datanodeDetails);
    try {
      // try to read
      readKey(bucket, keyName, value);
      fail("Expected exception not thrown");
    } catch (IOException e) {
      // it should throw an ioException as none of the servers
      // are available
    }
    factory.releaseClient(clientSpi, false);
  }

  private void readKey(OzoneBucket bucket, String keyName, String data)
      throws IOException {
    OzoneKey key = bucket.getKey(keyName);
    Assert.assertEquals(keyName, key.getName());
    OzoneInputStream is = bucket.readKey(keyName);
    byte[] fileContent = new byte[data.getBytes(UTF_8).length];
    is.read(fileContent);
    is.close();
  }
}