/**

 * copy-image-resizer

 * Copyright © 2013 František Kučera (frantovo.cz)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

package cz.frantovo.copyImageResizer.logging;

import cz.frantovo.copyImageResizer.Constants;

import java.util.logging.ConsoleHandler;

import java.util.logging.Handler;

import java.util.logging.Level;

import java.util.logging.Logger;

/**

 * Configures logging subsystem.

 * Usage: java -Djava.util.logging.config.class=info.globalcode.sql.dk.logging.ConsoleLoggerInitializer …

 *

 * @author Ing. František Kučera (frantovo.cz)

 */

public class ConsoleLoggerInitializer {

	private static final Logger log = Logger.getLogger(ConsoleLoggerInitializer.class.getName());

	public static final String LEVEL_PROPERTY = ConsoleLoggerInitializer.class.getName() + ".level";

	private static final Level DEFAULT_LEVEL = Level.INFO;

	public ConsoleLoggerInitializer() {

		Logger logger = Logger.getLogger(Constants.JAVA_PACKAGE);

		ConsoleHandler handler = new ConsoleHandler();

		ColorfulConsoleFormatter formatter = new ColorfulConsoleFormatter();

		logger.addHandler(handler);

		handler.setFormatter(formatter);

		setLevel(logger, handler, formatter);

		/**

		 * TODO: optional FileHandler – detailed logs in file in ~/sql-dk/log/…

		 */

	}

	private void setLevel(Logger logger, Handler handler, ColorfulConsoleFormatter formatter) {

		boolean levelParseError = false;

		Level level;

		String cliLevel = System.getProperty(LEVEL_PROPERTY);

		if (cliLevel == null) {

			level = DEFAULT_LEVEL;

		} else {

			try {

				level = Level.parse(cliLevel);

			} catch (IllegalArgumentException e) {

				level = DEFAULT_LEVEL;

				levelParseError = true;

			}

		}

		handler.setLevel(level);

		logger.setLevel(level);

		if (levelParseError) {

			log.log(Level.WARNING, "Invalid logging level „{0}“ specified in „{1}“ → using default level „{2}“", new Object[]{cliLevel, LEVEL_PROPERTY, DEFAULT_LEVEL});

		}

		formatter.setPrintStacktrace(level.intValue() < Level.INFO.intValue());

	}

}