/**
 * 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.apex.examples.wordcount;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.apex.malhar.lib.io.SimpleSinglePortInputOperator;

/**
 * <p>WordCountInputOperator class.</p>
 *
 * @since 0.3.2
 */
public class WordCountInputOperator extends SimpleSinglePortInputOperator<String> implements Runnable
{

  private static final Logger logger = LoggerFactory.getLogger(WordCountInputOperator.class);
  protected long averageSleep = 300;
  protected long sleepPlusMinus = 100;
  protected String fileName = "com/datatorrent/examples/wordcount/samplefile.txt";

  public void setAverageSleep(long as)
  {
    averageSleep = as;
  }

  public void setSleepPlusMinus(long spm)
  {
    sleepPlusMinus = spm;
  }

  public void setFileName(String fn)
  {
    fileName = fn;
  }

  @Override
  public void run()
  {
    BufferedReader br = null;
    DataInputStream in = null;
    InputStream fstream = null;

    while (true) {
      try {
        String line;
        fstream = this.getClass().getClassLoader().getResourceAsStream(fileName);

        in = new DataInputStream(fstream);
        br = new BufferedReader(new InputStreamReader(in));

        while ((line = br.readLine()) != null) {
          String[] words = line.trim().split("[\\p{Punct}\\s\\\"\\'“”]+");
          for (String word : words) {
            word = word.trim().toLowerCase();
            if (!word.isEmpty()) {
              outputPort.emit(word);
            }
          }
          try {
            Thread.sleep(averageSleep + (new Double(sleepPlusMinus * (Math.random() * 2 - 1))).longValue());
          } catch (InterruptedException ex) {
            // nothing
          }
        }

      } catch (IOException ex) {
        logger.debug(ex.toString());
      } finally {
        try {
          if (br != null) {
            br.close();
          }
          if (in != null) {
            in.close();
          }
          if (fstream != null) {
            fstream.close();
          }
        } catch (IOException exc) {
          // nothing
        }
      }
    }
  }
}