/**
 * 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.hbase.replication;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.util.ArrayList;
import java.util.List;
import java.util.NavigableMap;
import java.util.TreeMap;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
import org.apache.hadoop.hbase.client.replication.TableCFs;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.testclassification.ReplicationTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.wal.WAL;
import org.apache.hadoop.hbase.wal.WALEdit;
import org.apache.hadoop.hbase.wal.WALKeyImpl;
import org.junit.Before;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Category({ ReplicationTests.class, LargeTests.class })
public class TestReplicationSmallTests extends TestReplicationBase {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestReplicationSmallTests.class);

  private static final Logger LOG = LoggerFactory.getLogger(TestReplicationSmallTests.class);
  private static final String PEER_ID = "2";

  @Before
  public void setUp() throws Exception {
    cleanUp();
  }

  /**
   * Verify that version and column delete marker types are replicated correctly.
   */
  @Test
  public void testDeleteTypes() throws Exception {
    LOG.info("testDeleteTypes");
    final byte[] v1 = Bytes.toBytes("v1");
    final byte[] v2 = Bytes.toBytes("v2");
    final byte[] v3 = Bytes.toBytes("v3");
    htable1 = utility1.getConnection().getTable(tableName);

    long t = EnvironmentEdgeManager.currentTime();
    // create three versions for "row"
    Put put = new Put(row);
    put.addColumn(famName, row, t, v1);
    htable1.put(put);

    put = new Put(row);
    put.addColumn(famName, row, t + 1, v2);
    htable1.put(put);

    put = new Put(row);
    put.addColumn(famName, row, t + 2, v3);
    htable1.put(put);

    Get get = new Get(row);
    get.readAllVersions();
    for (int i = 0; i < NB_RETRIES; i++) {
      if (i == NB_RETRIES - 1) {
        fail("Waited too much time for put replication");
      }
      Result res = htable2.get(get);
      if (res.size() < 3) {
        LOG.info("Rows not available");
        Thread.sleep(SLEEP_TIME);
      } else {
        assertArrayEquals(CellUtil.cloneValue(res.rawCells()[0]), v3);
        assertArrayEquals(CellUtil.cloneValue(res.rawCells()[1]), v2);
        assertArrayEquals(CellUtil.cloneValue(res.rawCells()[2]), v1);
        break;
      }
    }
    // place a version delete marker (delete last version)
    Delete d = new Delete(row);
    d.addColumn(famName, row, t);
    htable1.delete(d);

    get = new Get(row);
    get.readAllVersions();
    for (int i = 0; i < NB_RETRIES; i++) {
      if (i == NB_RETRIES - 1) {
        fail("Waited too much time for put replication");
      }
      Result res = htable2.get(get);
      if (res.size() > 2) {
        LOG.info("Version not deleted");
        Thread.sleep(SLEEP_TIME);
      } else {
        assertArrayEquals(CellUtil.cloneValue(res.rawCells()[0]), v3);
        assertArrayEquals(CellUtil.cloneValue(res.rawCells()[1]), v2);
        break;
      }
    }

    // place a column delete marker
    d = new Delete(row);
    d.addColumns(famName, row, t + 2);
    htable1.delete(d);

    // now *both* of the remaining version should be deleted
    // at the replica
    get = new Get(row);
    for (int i = 0; i < NB_RETRIES; i++) {
      if (i == NB_RETRIES - 1) {
        fail("Waited too much time for del replication");
      }
      Result res = htable2.get(get);
      if (res.size() >= 1) {
        LOG.info("Rows not deleted");
        Thread.sleep(SLEEP_TIME);
      } else {
        break;
      }
    }
  }

  /**
   * Add a row, check it's replicated, delete it, check's gone
   */
  @Test
  public void testSimplePutDelete() throws Exception {
    LOG.info("testSimplePutDelete");
    runSimplePutDeleteTest();
  }

  /**
   * Try a small batch upload using the write buffer, check it's replicated
   */
  @Test
  public void testSmallBatch() throws Exception {
    LOG.info("testSmallBatch");
    runSmallBatchTest();
  }

  /**
   * Test disable/enable replication, trying to insert, make sure nothing's replicated, enable it,
   * the insert should be replicated
   */
  @Test
  public void testDisableEnable() throws Exception {
    // Test disabling replication
    hbaseAdmin.disableReplicationPeer(PEER_ID);

    byte[] rowkey = Bytes.toBytes("disable enable");
    Put put = new Put(rowkey);
    put.addColumn(famName, row, row);
    htable1.put(put);

    Get get = new Get(rowkey);
    for (int i = 0; i < NB_RETRIES; i++) {
      Result res = htable2.get(get);
      if (res.size() >= 1) {
        fail("Replication wasn't disabled");
      } else {
        LOG.info("Row not replicated, let's wait a bit more...");
        Thread.sleep(SLEEP_TIME);
      }
    }

    // Test enable replication
    hbaseAdmin.enableReplicationPeer(PEER_ID);

    for (int i = 0; i < NB_RETRIES; i++) {
      Result res = htable2.get(get);
      if (res.isEmpty()) {
        LOG.info("Row not available");
        Thread.sleep(SLEEP_TIME);
      } else {
        assertArrayEquals(row, res.value());
        return;
      }
    }
    fail("Waited too much time for put replication");
  }

  /**
   * Integration test for TestReplicationAdmin, removes and re-add a peer cluster
   */
  @Test
  public void testAddAndRemoveClusters() throws Exception {
    LOG.info("testAddAndRemoveClusters");
    hbaseAdmin.removeReplicationPeer(PEER_ID);
    Thread.sleep(SLEEP_TIME);
    byte[] rowKey = Bytes.toBytes("Won't be replicated");
    Put put = new Put(rowKey);
    put.addColumn(famName, row, row);
    htable1.put(put);

    Get get = new Get(rowKey);
    for (int i = 0; i < NB_RETRIES; i++) {
      if (i == NB_RETRIES - 1) {
        break;
      }
      Result res = htable2.get(get);
      if (res.size() >= 1) {
        fail("Not supposed to be replicated");
      } else {
        LOG.info("Row not replicated, let's wait a bit more...");
        Thread.sleep(SLEEP_TIME);
      }
    }
    ReplicationPeerConfig rpc =
        ReplicationPeerConfig.newBuilder().setClusterKey(utility2.getClusterKey()).build();
    hbaseAdmin.addReplicationPeer(PEER_ID, rpc);
    Thread.sleep(SLEEP_TIME);
    rowKey = Bytes.toBytes("do rep");
    put = new Put(rowKey);
    put.addColumn(famName, row, row);
    LOG.info("Adding new row");
    htable1.put(put);

    get = new Get(rowKey);
    for (int i = 0; i < NB_RETRIES; i++) {
      if (i == NB_RETRIES - 1) {
        fail("Waited too much time for put replication");
      }
      Result res = htable2.get(get);
      if (res.isEmpty()) {
        LOG.info("Row not available");
        Thread.sleep(SLEEP_TIME * i);
      } else {
        assertArrayEquals(row, res.value());
        break;
      }
    }
  }

  /**
   * Do a more intense version testSmallBatch, one that will trigger wal rolling and other
   * non-trivial code paths
   */
  @Test
  public void testLoading() throws Exception {
    LOG.info("Writing out rows to table1 in testLoading");
    List<Put> puts = new ArrayList<>(NB_ROWS_IN_BIG_BATCH);
    for (int i = 0; i < NB_ROWS_IN_BIG_BATCH; i++) {
      Put put = new Put(Bytes.toBytes(i));
      put.addColumn(famName, row, row);
      puts.add(put);
    }
    // The puts will be iterated through and flushed only when the buffer
    // size is reached.
    htable1.put(puts);

    Scan scan = new Scan();

    ResultScanner scanner = htable1.getScanner(scan);
    Result[] res = scanner.next(NB_ROWS_IN_BIG_BATCH);
    scanner.close();

    assertEquals(NB_ROWS_IN_BIG_BATCH, res.length);

    LOG.info("Looking in table2 for replicated rows in testLoading");
    long start = System.currentTimeMillis();
    // Retry more than NB_RETRIES. As it was, retries were done in 5 seconds and we'd fail
    // sometimes.
    final long retries = NB_RETRIES * 10;
    for (int i = 0; i < retries; i++) {
      scan = new Scan();
      scanner = htable2.getScanner(scan);
      res = scanner.next(NB_ROWS_IN_BIG_BATCH);
      scanner.close();
      if (res.length != NB_ROWS_IN_BIG_BATCH) {
        if (i == retries - 1) {
          int lastRow = -1;
          for (Result result : res) {
            int currentRow = Bytes.toInt(result.getRow());
            for (int row = lastRow + 1; row < currentRow; row++) {
              LOG.error("Row missing: " + row);
            }
            lastRow = currentRow;
          }
          LOG.error("Last row: " + lastRow);
          fail("Waited too much time for normal batch replication, " + res.length + " instead of " +
            NB_ROWS_IN_BIG_BATCH + "; waited=" + (System.currentTimeMillis() - start) + "ms");
        } else {
          LOG.info("Only got " + res.length + " rows... retrying");
          Thread.sleep(SLEEP_TIME);
        }
      } else {
        break;
      }
    }
  }

  /**
   * Test for HBASE-8663
   * <p>
   * Create two new Tables with colfamilies enabled for replication then run
   * ReplicationAdmin.listReplicated(). Finally verify the table:colfamilies. Note:
   * TestReplicationAdmin is a better place for this testing but it would need mocks.
   */
  @Test
  public void testVerifyListReplicatedTable() throws Exception {
    LOG.info("testVerifyListReplicatedTable");

    final String tName = "VerifyListReplicated_";
    final String colFam = "cf1";
    final int numOfTables = 3;

    Admin hadmin = utility1.getAdmin();

    // Create Tables
    for (int i = 0; i < numOfTables; i++) {
      hadmin.createTable(TableDescriptorBuilder.newBuilder(TableName.valueOf(tName + i))
          .setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes(colFam))
              .setScope(HConstants.REPLICATION_SCOPE_GLOBAL).build())
          .build());
    }

    // verify the result
    List<TableCFs> replicationColFams = hbaseAdmin.listReplicatedTableCFs();
    int[] match = new int[numOfTables]; // array of 3 with init value of zero

    for (int i = 0; i < replicationColFams.size(); i++) {
      TableCFs replicationEntry = replicationColFams.get(i);
      String tn = replicationEntry.getTable().getNameAsString();
      if (tn.startsWith(tName) && replicationEntry.getColumnFamilyMap().containsKey(colFam)) {
        int m = Integer.parseInt(tn.substring(tn.length() - 1)); // get the last digit
        match[m]++; // should only increase once
      }
    }

    // check the matching result
    for (int i = 0; i < match.length; i++) {
      assertTrue("listReplicated() does not match table " + i, (match[i] == 1));
    }

    // drop tables
    for (int i = 0; i < numOfTables; i++) {
      TableName tableName = TableName.valueOf(tName + i);
      hadmin.disableTable(tableName);
      hadmin.deleteTable(tableName);
    }

    hadmin.close();
  }

  /**
   * Test for HBase-15259 WALEdits under replay will also be replicated
   */
  @Test
  public void testReplicationInReplay() throws Exception {
    final TableName tableName = htable1.getName();

    HRegion region = utility1.getMiniHBaseCluster().getRegions(tableName).get(0);
    RegionInfo hri = region.getRegionInfo();
    NavigableMap<byte[], Integer> scopes = new TreeMap<>(Bytes.BYTES_COMPARATOR);
    for (byte[] fam : htable1.getDescriptor().getColumnFamilyNames()) {
      scopes.put(fam, 1);
    }
    final MultiVersionConcurrencyControl mvcc = new MultiVersionConcurrencyControl();
    int index = utility1.getMiniHBaseCluster().getServerWith(hri.getRegionName());
    WAL wal = utility1.getMiniHBaseCluster().getRegionServer(index).getWAL(region.getRegionInfo());
    final byte[] rowName = Bytes.toBytes("testReplicationInReplay");
    final byte[] qualifier = Bytes.toBytes("q");
    final byte[] value = Bytes.toBytes("v");
    WALEdit edit = new WALEdit(true);
    long now = EnvironmentEdgeManager.currentTime();
    edit.add(new KeyValue(rowName, famName, qualifier, now, value));
    WALKeyImpl walKey = new WALKeyImpl(hri.getEncodedNameAsBytes(), tableName, now, mvcc, scopes);
    wal.append(hri, walKey, edit, true);
    wal.sync();

    Get get = new Get(rowName);
    for (int i = 0; i < NB_RETRIES; i++) {
      if (i == NB_RETRIES - 1) {
        break;
      }
      Result res = htable2.get(get);
      if (res.size() >= 1) {
        fail("Not supposed to be replicated for " + Bytes.toString(res.getRow()));
      } else {
        LOG.info("Row not replicated, let's wait a bit more...");
        Thread.sleep(SLEEP_TIME);
      }
    }
  }
}