/**

 * 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 java.io.PrintWriter;

import java.io.StringWriter;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.logging.Level;

import java.util.logging.LogRecord;

/**

 * For console/terminal log output. Log messages are printed in brief and colorful form.

 *

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

 */

public class SimpleFormatter extends AbstractFormatter {

	private static final ThreadLocal<SimpleDateFormat> dateFormatter = new ThreadLocal<SimpleDateFormat>() {

		@Override

		protected SimpleDateFormat initialValue() {

			return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		}

	};

	@Override

	public String format(LogRecord r) {

		StringBuilder sb = new StringBuilder();

		printTimestamp(sb, new Date(r.getMillis()));

		printSeparator(sb);

		printLevel(sb, r.getLevel());

		printSeparator(sb);

		printMessage(sb, r);

		printSeparator(sb);

		printThrowable(sb, r);

		sb.append("\n");

		return sb.toString();

	}

	private void printSeparator(StringBuilder out) {

		out.append(" | ");

	}

	private void printTimestamp(StringBuilder out, Date date) {

		out.append(dateFormatter.get().format(date));

	}

	private void printLevel(StringBuilder out, Level l) {

		if (l == Level.SEVERE) {

			out.append(rpad("ERROR", 10));

		} else if (l == Level.INFO) {

			out.append(rpad("OK", 10));

		} else {

			out.append(rpad(l.getName(), 10));

		}

	}

	private void printMessage(StringBuilder out, LogRecord r) {

		String message = formatMessage(r);

		// convert to single-line message

		message = message.replaceAll("\\\\", "\\\\"); // escape backslashes

		message = message.replaceAll("\\n", "\\n"); // escape line ends

		out.append(message);

	}

	private void printThrowable(StringBuilder out, LogRecord r) {

		Throwable t = r.getThrown();

		if (t != null) {

			out.append(t.getClass().getSimpleName());

			String message = t.getLocalizedMessage();

			if (message != null) {

				out.append(": ");

				out.append(message);

			}

			if (isPrintStacktrace()) {

				out.append("\n");

				StringWriter sw = new StringWriter();

				t.printStackTrace(new PrintWriter(sw));

				out.append(sw.toString());

			}

		}

	}

}