/*
   Copyright 2013 Nationale-Nederlanden

   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 nl.nn.adapterframework.extensions.log4j;

import java.io.File;
import java.util.Date;

import nl.nn.adapterframework.util.DateUtils;
import nl.nn.adapterframework.util.WildCardFilter;

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

/**
 * Extension of DailyRollingFileAppender with the facility to clean up files.
 *
 * @author  Peter Leeuwenburgh
 */

public class IbisDailyRollingFileAppender extends DailyRollingFileAppender {
	final long millisPerDay = 24 * 60 * 60 * 1000;

	protected int retentionDays = 7;

	private String nextCheck =
		DateUtils.format(new Date(0), DateUtils.shortIsoFormat);

	public void subAppend(LoggingEvent event) {
		super.subAppend(event);

		String n = DateUtils.format(new Date(), DateUtils.shortIsoFormat);
		// cleaning up files is done once a day
		if (n.compareTo(nextCheck) > 0) {
			nextCheck = n;

			long deleteBefore =
				System.currentTimeMillis() - retentionDays * millisPerDay;

			String msgLogFileName = getFile();
			File msgLogFile = new File(msgLogFileName);
			String dirName = msgLogFile.getParent();
			String fileWithoutDirName = msgLogFile.getName();

			WildCardFilter filter =
				new WildCardFilter(fileWithoutDirName + ".*");
			File dir = new File(dirName);
			File[] files = dir.listFiles(filter);

			int count = (files == null ? 0 : files.length);
			for (int i = 0; i < count; i++) {
				File file = files[i];
				if (file.isDirectory()) {
					continue;
				}
				if (file.lastModified() < deleteBefore) {
					LogLog.debug("Deleting file " + file);
					file.delete();
				}
			}
		}
	}

	public void setRetentionDays(int retentionDays) {
		this.retentionDays = retentionDays;
	}

	public int getRetentionDays() {
		return retentionDays;
	}
}