/*
 * Copyright 2012  Research Studios Austria Forschungsges.m.b.H.
 *
 *    Licensed 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 won.monitoring;

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

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Monitoring statistics recorder that can be configured to write new files conforming
 * to a specified filename pattern into a specified directory. If no directory
 * is specified, a temp directory is created.
 */
public abstract class AbstractFileOutputRecorder extends AbstractRecorder
{
  private static final String TEMPDIR_PREFIX = "monitoringStatsCSV";
  protected final Logger logger = LoggerFactory.getLogger(getClass());
  private File outputDirectory;
  /**
   * DateFormat pattern for creating the filename for the date it is written.
   */
  private String outfilePattern = "'monitoring-'yyyy-MM-dd'T'HH-mm-ss'.log'";

  protected String createOutFilename(){
    SimpleDateFormat format = new SimpleDateFormat(outfilePattern);
    return format.format(new Date());
  }

  protected File createOutFileObject() throws IOException
  {
    if (this.outputDirectory == null){
      this.outputDirectory = Files.createTempDirectory(TEMPDIR_PREFIX).toFile();
      logger.info("created temporary directory for monitoring output: {}", this.outputDirectory);
    } else {
      if (!this.outputDirectory.exists()){
        boolean success = this.outputDirectory.createNewFile();
        if (success) {
          logger.info("created temporary directory for monitoring output: {}", this.outputDirectory);
        }
      }
    }
    File newOutfile = new File(this.outputDirectory,createOutFilename());
    logger.debug("writing monitoring statistics to file {}", newOutfile);
    return newOutfile;
  }

  protected File getOutputDirectory()
  {
    return outputDirectory;
  }

  public void setOutputDirectory(final File outputDirectory)
  {
    this.outputDirectory = outputDirectory;
  }

  protected String getOutfilePattern()
  {
    return outfilePattern;
  }

  public void setOutfilePattern(final String outfilePattern)
  {
    this.outfilePattern = outfilePattern;
  }
}