/*
 * 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.chukwa.datacollection.adaptor.filetailer;


import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
import org.apache.hadoop.chukwa.Chunk;
import org.apache.hadoop.chukwa.datacollection.adaptor.*;
import org.apache.hadoop.chukwa.datacollection.agent.ChukwaAgent;
import org.apache.hadoop.chukwa.datacollection.controller.ChukwaAgentController;
import org.apache.hadoop.chukwa.datacollection.connector.ChunkCatcherConnector;
import org.apache.hadoop.conf.Configuration;
import junit.framework.TestCase;

public class TestStartAtOffset extends TestCase {

  ChunkCatcherConnector chunks;

  public TestStartAtOffset() {
    chunks = new ChunkCatcherConnector();
    chunks.start();
  }
  

  public void startAtOffset() throws IOException, InterruptedException,
      ChukwaAgent.AlreadyRunningException {
    Configuration conf = new Configuration();
    conf.set("chukwaAgent.control.port", "0");
    conf.setInt("chukwaAgent.adaptor.context.switch.time", 100);
    ChukwaAgent agent = ChukwaAgent.getAgent(conf);
    agent.start();
    File testFile = makeTestFile();
    int startOffset = 0; // skip first line
    String adaptorId = agent
       .processAddCommand("add org.apache.hadoop.chukwa.datacollection.adaptor"+
            "filetailer.CharFileTailingAdaptorUTF8 "
            + "lines " + startOffset + " " + testFile + " " + startOffset);
    assertTrue(adaptorId != null);
    System.out.println("getting a chunk...");
    Chunk c = chunks.waitForAChunk();
    System.out.println("got chunk");
    while (!c.getDataType().equals("lines")) {
      c = chunks.waitForAChunk();
    }
    assertTrue(c.getSeqID() == testFile.length() + startOffset);
    System.out.println("RecordOffsets length:" + c.getRecordOffsets().length);
    assertTrue(c.getRecordOffsets().length == 80); // 80 lines in the file.
    int recStart = 0;
    for (int rec = 0; rec < c.getRecordOffsets().length; ++rec) {
      String record = new String(c.getData(), recStart,
          c.getRecordOffsets()[rec] - recStart + 1);
      System.out.println("record " + rec + " was: " + record);
      assertTrue(record.equals(rec + " abcdefghijklmnopqrstuvwxyz\n"));
      recStart = c.getRecordOffsets()[rec] + 1;
    }
    assertTrue(c.getDataType().equals("lines"));
    agent.stopAdaptor(adaptorId, false);
    agent.shutdown();
  }

  public void testStartAfterOffset() throws IOException, InterruptedException,
      ChukwaAgent.AlreadyRunningException {
    Configuration conf = new Configuration();
    conf.set("chukwaAgent.control.port", "0");
    conf.setInt("chukwaAgent.adaptor.context.switch.time", 100);
    ChukwaAgent agent = ChukwaAgent.getAgent(conf);
    agent.start();
    File testFile = makeTestFile();
    int startOffset = 0;
    String adaptorId = agent
        .processAddCommand("add org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.CharFileTailingAdaptorUTF8 "
            + "lines "
            + startOffset
            + " "
            + testFile
            + " "
            + (startOffset + 29));
    assertTrue(adaptorId != null);
    System.out.println("getting a chunk...");
    Chunk c = chunks.waitForAChunk();
    System.out.println("got chunk");
    while (!c.getDataType().equals("lines")) {
      c = chunks.waitForAChunk();
    }
    assertTrue(c.getSeqID() == testFile.length() + startOffset);

    assertTrue(c.getRecordOffsets().length == 79);// 80 lines in test file,
                                                  // minus the one we skipped
    int recStart = 0;
    for (int rec = 0; rec < c.getRecordOffsets().length; ++rec) {
      String record = new String(c.getData(), recStart,
          c.getRecordOffsets()[rec] - recStart + 1);
      System.out.println("record " + rec + " was: " + record);
      assertTrue(record.equals((rec + 1) + " abcdefghijklmnopqrstuvwxyz\n"));
      recStart = c.getRecordOffsets()[rec] + 1;
    }
    assertTrue(c.getDataType().equals("lines"));
    agent.stopAdaptor(adaptorId, false);
    agent.shutdown();
  }

  private File makeTestFile() throws IOException {
    return org.apache.hadoop.chukwa.util.TempFileUtil.makeTestFile();
  }

}