/**

  * 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());

 			}

 		}

 	}

 }