/**
 * 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.mapreduce;


import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.ArgumentMatchers.isA;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.when;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.StringReader;

import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.*;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.TaskReport;
import org.apache.hadoop.mapreduce.JobStatus.State;
import org.apache.hadoop.mapreduce.protocol.ClientProtocol;
import org.apache.log4j.Layout;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.WriterAppender;
import org.mockito.stubbing.Answer;

/**
 * Test to make sure that command line output for 
 * job monitoring is correct and prints 100% for map and reduce before 
 * successful completion.
 */
public class TestJobMonitorAndPrint {
  private Job job;
  private Configuration conf;
  private ClientProtocol clientProtocol;

  @Before
  public void setUp() throws IOException {
    conf = new Configuration();
    clientProtocol = mock(ClientProtocol.class);
    Cluster cluster = mock(Cluster.class);
    when(cluster.getConf()).thenReturn(conf);
    when(cluster.getClient()).thenReturn(clientProtocol);
    JobStatus jobStatus = new JobStatus(new JobID("job_000", 1), 0f, 0f, 0f, 0f, 
        State.RUNNING, JobPriority.HIGH, "tmp-user", "tmp-jobname", 
        "tmp-jobfile", "tmp-url");
    job = Job.getInstance(cluster, jobStatus, conf);
    job = spy(job);
  }

  @Test
  public void testJobMonitorAndPrint() throws Exception {
    JobStatus jobStatus_1 = new JobStatus(new JobID("job_000", 1), 1f, 0.1f,
        0.1f, 0f, State.RUNNING, JobPriority.HIGH, "tmp-user", "tmp-jobname",
        "tmp-queue", "tmp-jobfile", "tmp-url", true);
    JobStatus jobStatus_2 = new JobStatus(new JobID("job_000", 1), 1f, 1f,
        1f, 1f, State.SUCCEEDED, JobPriority.HIGH, "tmp-user", "tmp-jobname",
        "tmp-queue", "tmp-jobfile", "tmp-url", true);

    doAnswer((Answer<TaskCompletionEvent[]>) invocation ->
        TaskCompletionEvent.EMPTY_ARRAY).when(job)
        .getTaskCompletionEvents(anyInt(), anyInt());

    doReturn(new TaskReport[5]).when(job).getTaskReports(isA(TaskType.class));
    when(clientProtocol.getJobStatus(any(JobID.class))).thenReturn(jobStatus_1, jobStatus_2);
    // setup the logger to capture all logs
    Layout layout =
        Logger.getRootLogger().getAppender("stdout").getLayout();
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    WriterAppender appender = new WriterAppender(layout, os);
    appender.setThreshold(Level.ALL);
    Logger qlogger = Logger.getLogger(Job.class);
    qlogger.addAppender(appender);

    job.monitorAndPrintJob();

    qlogger.removeAppender(appender);
    LineNumberReader r = new LineNumberReader(new StringReader(os.toString()));
    String line;
    boolean foundHundred = false;
    boolean foundComplete = false;
    boolean foundUber = false;
    String uberModeMatch = "uber mode : true";
    String progressMatch = "map 100% reduce 100%";
    String completionMatch = "completed successfully";
    while ((line = r.readLine()) != null) {
      if (line.contains(uberModeMatch)) {
        foundUber = true;
      }
      foundHundred = line.contains(progressMatch);      
      if (foundHundred)
        break;
    }
    line = r.readLine();
    foundComplete = line.contains(completionMatch);
    assertTrue(foundUber);
    assertTrue(foundHundred);
    assertTrue(foundComplete);

    System.out.println("The output of job.toString() is : \n" + job.toString());
    assertTrue(job.toString().contains("Number of maps: 5\n"));
    assertTrue(job.toString().contains("Number of reduces: 5\n"));
  }
}
