/**
 * SQL-DK
 * 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, version 3 of the License.
 *
 * 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 info.globalcode.sql.dk.logging;

import info.globalcode.sql.dk.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.LoggerInitializer …
 *
 * @author Ing. František Kučera (frantovo.cz)
 */
public class LoggerInitializer {

	private static final Logger log = Logger.getLogger(LoggerInitializer.class.getName());
	public static final String LEVEL_PROPERTY = LoggerInitializer.class.getName() + ".level";
	private static final Level DEFAULT_LEVEL = Level.INFO;

	public LoggerInitializer() {
		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());
	}
}