/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at legal-notices/CDDLv1_0.txt.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2006-2008 Sun Microsystems, Inc.
 *      Portions Copyright 2014 ForgeRock AS
 */
package org.opends.server.loggers;
import org.opends.messages.Message;

import java.util.*;

import org.opends.server.util.TimeThread;

import static org.opends.server.loggers.debug.DebugLogger.*;
import org.opends.server.loggers.debug.DebugTracer;
import org.opends.server.admin.std.server.FixedTimeLogRotationPolicyCfg;
import org.opends.server.admin.server.ConfigurationChangeListener;
import org.opends.server.types.ConfigChangeResult;
import org.opends.server.types.ResultCode;


/**
 * This class implements a rotation policy based on fixed
 * day/time of day.
 */
public class FixedTimeRotationPolicy implements
    RotationPolicy<FixedTimeLogRotationPolicyCfg>,
    ConfigurationChangeListener<FixedTimeLogRotationPolicyCfg>
{
  /**
   * The tracer object for the debug logger.
   */
  private static final DebugTracer TRACER = getTracer();


  private static final long MS_IN_DAY = 24 * 3600 * 1000;

  // The scheduled rotation times as ms offsets from the beginnging of the day.
  private int[] rotationTimes;

  /**
   * {@inheritDoc}
   */
  public void initializeLogRotationPolicy(FixedTimeLogRotationPolicyCfg config)
  {
    rotationTimes = new int[config.getTimeOfDay().size()];

    int i = 0;
    for(String time : config.getTimeOfDay())
    {
      rotationTimes[i++] = Integer.valueOf(time);
    }

    Arrays.sort(rotationTimes);

    config.addFixedTimeChangeListener(this);
  }

  /**
   * {@inheritDoc}
   */
  public boolean isConfigurationChangeAcceptable(
      FixedTimeLogRotationPolicyCfg config, List<Message> unacceptableReasons)
  {
    // Changes should always be OK
    return true;
  }

  /**
   * {@inheritDoc}
   */
  public ConfigChangeResult applyConfigurationChange(
      FixedTimeLogRotationPolicyCfg config)
  {
    // Default result code.
    ResultCode resultCode = ResultCode.SUCCESS;
    boolean adminActionRequired = false;
    ArrayList<Message> messages = new ArrayList<Message>();

    rotationTimes = new int[config.getTimeOfDay().size()];

    int i = 0;
    for(String time : config.getTimeOfDay())
    {
      rotationTimes[i++] = Integer.valueOf(time);
    }

    Arrays.sort(rotationTimes);

    return new ConfigChangeResult(resultCode, adminActionRequired, messages);
  }

  /**
   * {@inheritDoc}
   */
  public boolean rotateFile(RotatableLogFile writer)
  {
    Calendar lastRotationTime = writer.getLastRotationTime();

    Calendar nextRotationTime = (Calendar)lastRotationTime.clone();
    int i = 0;
    nextRotationTime.set(Calendar.HOUR_OF_DAY, rotationTimes[i] / 100);
    nextRotationTime.set(Calendar.MINUTE, rotationTimes[i] % 100);
    nextRotationTime.set(Calendar.SECOND, 0);
    while(lastRotationTime.after(nextRotationTime))
    {
      if(i == rotationTimes.length - 1)
      {
        nextRotationTime.add(Calendar.DATE, 1);
        i = 0;
      }
      else
      {
        i++;
      }

      nextRotationTime.set(Calendar.HOUR_OF_DAY, rotationTimes[i] / 100);
      nextRotationTime.set(Calendar.MINUTE, rotationTimes[i] % 100);
    }

    if (debugEnabled())
    {
      TRACER.debugInfo("The next fixed rotation time is %s", rotationTimes[i]);
    }

    return TimeThread.getCalendar().after(nextRotationTime);
  }
}