/*
 * 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.hive.ql.io;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.io.DataInput;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.hadoop.hive.ql.io.AcidInputFormat.DeltaMetaData;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

@RunWith(MockitoJUnitRunner.class)
public class TestAcidInputFormat {

  @Mock
  private DataInput mockDataInput;

  @Test
  public void testDeltaMetaDataReadFieldsNoStatementIds() throws Exception {
    when(mockDataInput.readLong()).thenReturn(1L, 2L);
    when(mockDataInput.readInt()).thenReturn(0);

    DeltaMetaData deltaMetaData = new AcidInputFormat.DeltaMetaData();
    deltaMetaData.readFields(mockDataInput);

    verify(mockDataInput, times(1)).readInt();
    assertThat(deltaMetaData.getMinTxnId(), is(1L));
    assertThat(deltaMetaData.getMaxTxnId(), is(2L));
    assertThat(deltaMetaData.getStmtIds().isEmpty(), is(true));
  }

  @Test
  public void testDeltaMetaDataReadFieldsWithStatementIds() throws Exception {
    when(mockDataInput.readLong()).thenReturn(1L, 2L);
    when(mockDataInput.readInt()).thenReturn(2, 100, 101);

    DeltaMetaData deltaMetaData = new AcidInputFormat.DeltaMetaData();
    deltaMetaData.readFields(mockDataInput);

    verify(mockDataInput, times(3)).readInt();
    assertThat(deltaMetaData.getMinTxnId(), is(1L));
    assertThat(deltaMetaData.getMaxTxnId(), is(2L));
    assertThat(deltaMetaData.getStmtIds().size(), is(2));
    assertThat(deltaMetaData.getStmtIds().get(0), is(100));
    assertThat(deltaMetaData.getStmtIds().get(1), is(101));
  }

  @Test
  public void testDeltaMetaConstructWithState() throws Exception {
    DeltaMetaData deltaMetaData = new AcidInputFormat.DeltaMetaData(2000L, 2001L, Arrays.asList(97, 98, 99));

    assertThat(deltaMetaData.getMinTxnId(), is(2000L));
    assertThat(deltaMetaData.getMaxTxnId(), is(2001L));
    assertThat(deltaMetaData.getStmtIds().size(), is(3));
    assertThat(deltaMetaData.getStmtIds().get(0), is(97));
    assertThat(deltaMetaData.getStmtIds().get(1), is(98));
    assertThat(deltaMetaData.getStmtIds().get(2), is(99));
  }

  @Test
  public void testDeltaMetaDataReadFieldsWithStatementIdsResetsState() throws Exception {
    when(mockDataInput.readLong()).thenReturn(1L, 2L);
    when(mockDataInput.readInt()).thenReturn(2, 100, 101);

    List<Integer> statementIds = new ArrayList<>();
    statementIds.add(97);
    statementIds.add(98);
    statementIds.add(99);
    DeltaMetaData deltaMetaData = new AcidInputFormat.DeltaMetaData(2000L, 2001L, statementIds);
    deltaMetaData.readFields(mockDataInput);

    verify(mockDataInput, times(3)).readInt();
    assertThat(deltaMetaData.getMinTxnId(), is(1L));
    assertThat(deltaMetaData.getMaxTxnId(), is(2L));
    assertThat(deltaMetaData.getStmtIds().size(), is(2));
    assertThat(deltaMetaData.getStmtIds().get(0), is(100));
    assertThat(deltaMetaData.getStmtIds().get(1), is(101));
  }

}