/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software
 * License version 1.1, a copy of which has been included with this
 * distribution in the LICENSE.txt file.  */



package org.apache.log4j;

import java.io.IOException;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Calendar;
import java.util.TimeZone;
import java.util.Locale;

import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;

/**
   DailyRollingFileAppender extends {@link FileAppender} so that the
   underlying file is rolled over at a user chosen frequency.

   
The rolling schedule is specified by the DatePattern
   option. This pattern should follow the {@link SimpleDateFormat}
   conventions. In particular, you must escape literal text
   within a pair of single quotes. A formatted version of the date
   pattern is used as the suffix for the rolled file name.

   
For example, if the File option is set to
   /foo/bar.log and the DatePattern set to
   '.'yyyy-MM-dd, on 2001-02-16 at midnight, the logging
   file /foo/bar.log will be copied to
   /foo/bar.log.2001-02-16 and logging for 2001-02-17
   will continue in /foo/bar.log until it rolls over
   the next day.

   
Is is possible to specify monthly, weekly, half-daily, daily,
   hourly, or minutely rollover schedules.

   

   

   
DatePattern
   
Rollover schedule
   
Example

   

   
'.'yyyy-MM
   
Rollover at the beginning of each month

   
At midnight of May 31st, 2002 /foo/bar.log will be
   copied to /foo/bar.log.2002-05. Logging for the month
   of June will be output to /foo/bar.log until it is
   also rolled over the next month.

   

   
'.'yyyy-ww

   
Rollover at the first day of each week. The first day of the
   week depends on the locale.

   
Assuming the first day of the week is Sunday, on Saturday
   midnight, June 9th 2002, the file /foo/bar.log will be
   copied to /foo/bar.log.2002-23.  Logging for the 24th week
   of 2002 will be output to /foo/bar.log until it is
   rolled over the next week.

   

   
'.'yyyy-MM-dd

   
Rollover at midnight each day.

   
At midnight, on March 8th, 2002, /foo/bar.log will
   be copied to /foo/bar.log.2002-03-08. Logging for the
   9th day of March will be output to /foo/bar.log until
   it is rolled over the next day.

   

   
'.'yyyy-MM-dd-a

   
Rollover at midnight and midday of each day.

   
At noon, on March 9th, 2002, /foo/bar.log will be
   copied to /foo/bar.log.2002-03-09-AM. Logging for the
   afternoon of the 9th will be output to /foo/bar.log
   until it is rolled over at midnight.

   

   
'.'yyyy-MM-dd-HH

   
Rollover at the top of every hour.

   
At approximately 11:00.000 o'clock on March 9th, 2002,
   /foo/bar.log will be copied to
   /foo/bar.log.2002-03-09-10. Logging for the 11th hour
   of the 9th of March will be output to /foo/bar.log
   until it is rolled over at the beginning of the next hour.


   

   
'.'yyyy-MM-dd-HH-mm

   
Rollover at the beginning of every minute.

   
At approximately 11:23,000, on March 9th, 2001,
   /foo/bar.log will be copied to
   /foo/bar.log.2001-03-09-10-22. Logging for the minute
   of 11:23 (9th of March) will be output to
   /foo/bar.log until it is rolled over the next minute.

   

   
Do not use the colon ":" character in anywhere in the
   DatePattern option. The text before the colon is interpeted
   as the protocol specificaion of a URL which is probably not what
   you want.


   @author Eirik Lygre
   @author Ceki Gülcü */
public class DailyRollingFileAppender extends FileAppender {


  // The code assumes that the following constants are in a increasing
  // sequence.
  static final int TOP_OF_TROUBLE=-1;
  static final int TOP_OF_MINUTE = 0;
  static final int TOP_OF_HOUR   = 1;
  static final int HALF_DAY      = 2;
  static final int TOP_OF_DAY    = 3;
  static final int TOP_OF_WEEK   = 4;
  static final int TOP_OF_MONTH  = 5;


  /**
     The date pattern. By default, the pattern is set to
     "'.'yyyy-MM-dd" meaning daily rollover.
   */
  private String datePattern = "'.'yyyy-MM-dd";

  /**
     The log file will be renamed to the value of the
     scheduledFilename variable when the next interval is entered. For
     example, if the rollover period is one hour, the log file will be
     renamed to the value of "scheduledFilename" at the beginning of
     the next hour. 

     The precise time when a rollover occurs depends on logging
     activity. 
  */
  private String scheduledFilename;

  /**
     The next time we estimate a rollover should occur. */
  private long nextCheck = System.currentTimeMillis () - 1;

  Date now = new Date();

  SimpleDateFormat sdf;

  RollingCalendar rc = new RollingCalendar();

  int checkPeriod = TOP_OF_TROUBLE;

  // The gmtTimeZone is used only in computeCheckPeriod() method.
  static final TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT");


  /**
     The default constructor does nothing. */
  public DailyRollingFileAppender() {
  }

  /**
    Instantiate a DailyRollingFileAppender and open the
    file designated by filename. The opened filename will
    become the ouput destination for this appender.

    */
  public DailyRollingFileAppender (Layout layout, String filename,
				   String datePattern) throws IOException {
    super(layout, filename, true);
    this.datePattern = datePattern;
    activateOptions();
  }

  /**
     The DatePattern takes a string in the same format as
     expected by {@link SimpleDateFormat}. This options determines the
     rollover schedule.
   */
  public void setDatePattern(String pattern) {
    datePattern = pattern;
  }

  /** Returns the value of the DatePattern option. */
  public String getDatePattern() {
    return datePattern;
  }

  public void activateOptions() {
    super.activateOptions();
    if(datePattern != null && fileName != null) {
      now.setTime(System.currentTimeMillis());
      sdf = new SimpleDateFormat(datePattern);
      int type = computeCheckPeriod();
      printPeriodicity(type);
      rc.setType(type);
      File file = new File(fileName);
      scheduledFilename = fileName+sdf.format(new Date(file.lastModified()));

    } else {
      LogLog.error("Either File or DatePattern options are not set for appender ["
		   +name+"].");
    }
  }

  void printPeriodicity(int type) {
    switch(type) {
    case TOP_OF_MINUTE:
      LogLog.debug("Appender ["+name+"] to be rolled every minute.");
      break;
    case TOP_OF_HOUR:
      LogLog.debug("Appender ["+name
		   +"] to be rolled on top of every hour.");
      break;
    case HALF_DAY:
      LogLog.debug("Appender ["+name
		   +"] to be rolled at midday and midnight.");
      break;
    case TOP_OF_DAY:
      LogLog.debug("Appender ["+name
		   +"] to be rolled at midnight.");
      break;
    case TOP_OF_WEEK:
      LogLog.debug("Appender ["+name
		   +"] to be rolled at start of week.");
      break;
    case TOP_OF_MONTH:
      LogLog.debug("Appender ["+name
		   +"] to be rolled at start of every month.");
      break;
    default:
      LogLog.warn("Unknown periodicity for appender ["+name+"].");
    }
  }


  // This method computes the roll over period by looping over the
  // periods, starting with the shortest, and stopping when the r0 is
  // different from from r1, where r0 is the epoch formatted according
  // the datePattern (supplied by the user) and r1 is the
  // epoch+nextMillis(i) formatted according to datePattern. All date
  // formatting is done in GMT and not local format because the test
  // logic is based on comparisons relative to 1970-01-01 00:00:00
  // GMT (the epoch).

  int computeCheckPeriod() {
    RollingCalendar rollingCalendar = new RollingCalendar(gmtTimeZone, Locale.ENGLISH);
    // set sate to 1970-01-01 00:00:00 GMT
    Date epoch = new Date(0);
    if(datePattern != null) {
      for(int i = TOP_OF_MINUTE; i <= TOP_OF_MONTH; i++) {
	SimpleDateFormat simpleDateFormat = new SimpleDateFormat(datePattern);
	simpleDateFormat.setTimeZone(gmtTimeZone); // do all date formatting in GMT
	String r0 = simpleDateFormat.format(epoch);
	rollingCalendar.setType(i);
	Date next = new Date(rollingCalendar.getNextCheckMillis(epoch));
	String r1 =  simpleDateFormat.format(next);
	//System.out.println("Type = "+i+", r0 = "+r0+", r1 = "+r1);
	if(r0 != null && r1 != null && !r0.equals(r1)) {
	  return i;
	}
      }
    }
    return TOP_OF_TROUBLE; // Deliberately head for trouble...
  }

  /**
     Rollover the current file to a new file.
  */
  void rollOver() throws IOException {

    /* Compute filename, but only if datePattern is specified */
    if (datePattern == null) {
      errorHandler.error("Missing DatePattern option in rollOver().");
      return;
    }

    String datedFilename = fileName+sdf.format(now);
    // It is too early to roll over because we are still within the
    // bounds of the current interval. Rollover will occur once the
    // next interval is reached.
    if (scheduledFilename.equals(datedFilename)) {
      return;
    }

    // close current file, and rename it to datedFilename
    this.closeFile();

    File target  = new File(scheduledFilename);
    if (target.exists()) {
      target.delete();
    }

    File file = new File(fileName);
    boolean result = file.renameTo(target);
    if(result) {
      LogLog.debug(fileName +" -> "+ scheduledFilename);
    } else {
      LogLog.error("Failed to rename ["+fileName+"] to ["+scheduledFilename+"].");
    }

    try {
      // This will also close the file. This is OK since multiple
      // close operations are safe.
      this.setFile(fileName, false, this.bufferedIO, this.bufferSize);
    }
    catch(IOException e) {
      errorHandler.error("setFile("+fileName+", false) call failed.");
    }
    scheduledFilename = datedFilename;
  }

  /**
   * This method differentiates DailyRollingFileAppender from its
   * super class.
   *
   * 
Before actually logging, this method will check whether it is
   * time to do a rollover. If it is, it will schedule the next
   * rollover time and then rollover.
   * */
  protected void subAppend(LoggingEvent event) {
    long n = System.currentTimeMillis();
    if (n >= nextCheck) {
      now.setTime(n);
      nextCheck = rc.getNextCheckMillis(now);
      try {
	rollOver();
      }
      catch(IOException ioe) {
	LogLog.error("rollOver() failed.", ioe);
      }
    }
    super.subAppend(event);
   }
}

/**
 *  RollingCalendar is a helper class to DailyRollingFileAppender.
 *  Given a periodicity type and the current time, it computes the
 *  start of the next interval.  
 * */
class RollingCalendar extends GregorianCalendar {

  int type = DailyRollingFileAppender.TOP_OF_TROUBLE;

  RollingCalendar() {
    super();
  }  

  RollingCalendar(TimeZone tz, Locale locale) {
    super(tz, locale);
  }  

  void setType(int type) {
    this.type = type;
  }

  public long getNextCheckMillis(Date now) {
    return getNextCheckDate(now).getTime();
  }

  public Date getNextCheckDate(Date now) {
    this.setTime(now);

    switch(type) {
    case DailyRollingFileAppender.TOP_OF_MINUTE:
	this.set(Calendar.SECOND, 0);
	this.set(Calendar.MILLISECOND, 0);
	this.add(Calendar.MINUTE, 1);
	break;
    case DailyRollingFileAppender.TOP_OF_HOUR:
	this.set(Calendar.MINUTE, 0);
	this.set(Calendar.SECOND, 0);
	this.set(Calendar.MILLISECOND, 0);
	this.add(Calendar.HOUR_OF_DAY, 1);
	break;
    case DailyRollingFileAppender.HALF_DAY:
	this.set(Calendar.MINUTE, 0);
	this.set(Calendar.SECOND, 0);
	this.set(Calendar.MILLISECOND, 0);
	int hour = get(Calendar.HOUR_OF_DAY);
	if(hour < 12) {
	  this.set(Calendar.HOUR_OF_DAY, 12);
	} else {
	  this.set(Calendar.HOUR_OF_DAY, 0);
	  this.add(Calendar.DAY_OF_MONTH, 1);
	}
	break;
    case DailyRollingFileAppender.TOP_OF_DAY:
	this.set(Calendar.HOUR_OF_DAY, 0);
	this.set(Calendar.MINUTE, 0);
	this.set(Calendar.SECOND, 0);
	this.set(Calendar.MILLISECOND, 0);
	this.add(Calendar.DATE, 1);
	break;
    case DailyRollingFileAppender.TOP_OF_WEEK:
	this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek());
	this.set(Calendar.HOUR_OF_DAY, 0);
	this.set(Calendar.SECOND, 0);
	this.set(Calendar.MILLISECOND, 0);
	this.add(Calendar.WEEK_OF_YEAR, 1);
	break;
    case DailyRollingFileAppender.TOP_OF_MONTH:
	this.set(Calendar.DATE, 1);
	this.set(Calendar.HOUR_OF_DAY, 0);
	this.set(Calendar.SECOND, 0);
	this.set(Calendar.MILLISECOND, 0);
	this.add(Calendar.MONTH, 1);
	break;
    default:
	throw new IllegalStateException("Unknown periodicity type.");
    }
    return getTime();
  }
}