/**
 * 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.mapreduce;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.any;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.IndexBuilder.Map;
import org.apache.hadoop.hbase.mapreduce.SampleUploader.Uploader;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.testclassification.MapReduceTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.LauncherSecurityManager;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Mapper.Context;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

@Category({MapReduceTests.class, LargeTests.class})
public class TestMapReduceExamples {
  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestMapReduceExamples.class);

  private static HBaseTestingUtility util = new HBaseTestingUtility();

  /**
   * Test SampleUploader from examples
   */
  @SuppressWarnings("unchecked")
  @Test
  public void testSampleUploader() throws Exception {
    Configuration configuration = new Configuration();
    Uploader uploader = new Uploader();
    Mapper<LongWritable, Text, ImmutableBytesWritable, Put>.Context ctx = mock(Context.class);
    doAnswer(new Answer<Void>() {

      @Override
      public Void answer(InvocationOnMock invocation) throws Throwable {
        ImmutableBytesWritable writer = (ImmutableBytesWritable) invocation.getArgument(0);
        Put put = (Put) invocation.getArgument(1);
        assertEquals("row", Bytes.toString(writer.get()));
        assertEquals("row", Bytes.toString(put.getRow()));
        return null;
      }
    }).when(ctx).write(any(), any());

    uploader.map(null, new Text("row,family,qualifier,value"), ctx);

    Path dir = util.getDataTestDirOnTestFS("testSampleUploader");

    String[] args = { dir.toString(), "simpleTable" };
    Job job = SampleUploader.configureJob(configuration, args);
    assertEquals(SequenceFileInputFormat.class, job.getInputFormatClass());
  }

  /**
   * Test main method of SampleUploader.
   */
  @Test
  public void testMainSampleUploader() throws Exception {
    PrintStream oldPrintStream = System.err;
    SecurityManager SECURITY_MANAGER = System.getSecurityManager();
    LauncherSecurityManager newSecurityManager= new LauncherSecurityManager();
    System.setSecurityManager(newSecurityManager);
    ByteArrayOutputStream data = new ByteArrayOutputStream();
    String[] args = {};
    System.setErr(new PrintStream(data));
    try {
      System.setErr(new PrintStream(data));

      try {
        SampleUploader.main(args);
        fail("should be SecurityException");
      } catch (SecurityException e) {
        assertEquals(-1, newSecurityManager.getExitCode());
        assertTrue(data.toString().contains("Wrong number of arguments:"));
        assertTrue(data.toString().contains("Usage: SampleUploader <input> <tablename>"));
      }

    } finally {
      System.setErr(oldPrintStream);
      System.setSecurityManager(SECURITY_MANAGER);
    }

  }

  /**
   * Test IndexBuilder from examples
   */
  @SuppressWarnings("unchecked")
  @Test
  public void testIndexBuilder() throws Exception {
    Configuration configuration = new Configuration();
    String[] args = { "tableName", "columnFamily", "column1", "column2" };
    IndexBuilder.configureJob(configuration, args);
    assertEquals("tableName", configuration.get("index.tablename"));
    assertEquals("tableName", configuration.get(TableInputFormat.INPUT_TABLE));
    assertEquals("column1,column2", configuration.get("index.fields"));

    Map map = new Map();
    ImmutableBytesWritable rowKey = new ImmutableBytesWritable(Bytes.toBytes("test"));
    Mapper<ImmutableBytesWritable, Result, ImmutableBytesWritable, Put>.Context ctx =
        mock(Context.class);
    when(ctx.getConfiguration()).thenReturn(configuration);
    doAnswer(new Answer<Void>() {

      @Override
      public Void answer(InvocationOnMock invocation) throws Throwable {
        ImmutableBytesWritable writer = (ImmutableBytesWritable) invocation.getArgument(0);
        Put put = (Put) invocation.getArgument(1);
        assertEquals("tableName-column1", Bytes.toString(writer.get()));
        assertEquals("test", Bytes.toString(put.getRow()));
        return null;
      }
    }).when(ctx).write(any(), any());
    Result result = mock(Result.class);
    when(result.getValue(Bytes.toBytes("columnFamily"), Bytes.toBytes("column1"))).thenReturn(
        Bytes.toBytes("test"));
    map.setup(ctx);
    map.map(rowKey, result, ctx);
  }

  /**
   * Test main method of IndexBuilder
   */
  @Test
  public void testMainIndexBuilder() throws Exception {
    PrintStream oldPrintStream = System.err;
    SecurityManager SECURITY_MANAGER = System.getSecurityManager();
    LauncherSecurityManager newSecurityManager= new LauncherSecurityManager();
    System.setSecurityManager(newSecurityManager);
    ByteArrayOutputStream data = new ByteArrayOutputStream();
    String[] args = {};
    System.setErr(new PrintStream(data));
    try {
      System.setErr(new PrintStream(data));
      try {
        IndexBuilder.main(args);
        fail("should be SecurityException");
      } catch (SecurityException e) {
        assertEquals(-1, newSecurityManager.getExitCode());
        assertTrue(data.toString().contains("arguments supplied, required: 3"));
        assertTrue(data.toString().contains(
            "Usage: IndexBuilder <TABLE_NAME> <COLUMN_FAMILY> <ATTR> [<ATTR> ...]"));
      }
    } finally {
      System.setErr(oldPrintStream);
      System.setSecurityManager(SECURITY_MANAGER);
    }
  }
}
