/*
Copyright (C) 2009  Diego Darriba

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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package es.uvigo.darwin.prottest.util.logging;

import es.uvigo.darwin.prottest.util.WriterOutputStream;
import es.uvigo.darwin.prottest.util.exception.ProtTestInternalException;
import java.io.OutputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.StreamHandler;

public class ProtTestLogger {

	public static final String DEFAULT_LOGGER_NAME = "default";
	public static final Level DEFAULT_LEVEL = Level.INFO;

	private static HashMap<String, ProtTestLogger> loggers;

	static {

		loggers = new HashMap<String, ProtTestLogger>();
		ProtTestLogger defaultLogger = new ProtTestLogger(DEFAULT_LOGGER_NAME);
		loggers.put(DEFAULT_LOGGER_NAME, defaultLogger);

	}

	private String loggerName;
	private Level loggerLevel;
	private List<Handler> handlers;
	private Handler stdHandler;
	private Handler lowLevelHandler = null;

	public static ProtTestLogger getLogger(String loggerName, boolean force) {
		if (!loggers.containsKey(loggerName)) {
			if (force)
				loggers.put(loggerName, new ProtTestLogger(loggerName));
			else
				return null;
		}
		return loggers.get(loggerName);
	}

	public static boolean exists(Class classLogger) {
		return getLogger(classLogger.getName(), false) != null;
	}

	public ProtTestLogger(String loggerName) {
		this.loggerName = loggerName;
		if (loggers.containsKey(loggerName))
			throw new ProtTestInternalException("ProtTestLogger with name "
					+ loggerName + " already exists. "
					+ " Use getLogger() instead");
		this.loggerLevel = Level.ALL;

		// Add standard output handler
		this.handlers = new ArrayList<Handler>();
		stdHandler = new StreamHandler(System.out, new ProtTestLogFormatter());
		stdHandler.setLevel(Level.OFF);
		handlers.add(stdHandler);
	}

	public static ProtTestLogger getDefaultLogger() {
		return getLogger(DEFAULT_LOGGER_NAME, true);
	}

	/**
	 * Check if a message of the given level would actually be logged by this
	 * logger. This check is based on the Loggers effective level, which may be
	 * inherited from its parent.
	 * 
	 * @param level
	 *            a message logging level
	 * @return true if the given message level is currently being logged.
	 */
	public boolean isLoggable(Level level) {
		if (level.intValue() < loggerLevel.intValue()
				|| loggerLevel.intValue() == Level.OFF.intValue()) {
			return false;
		}
		return true;
	}

	public void addHandler(Handler handler) {
		if (handler == null) {
			throw new NullPointerException();
		}
		this.handlers.add(handler);
	}

	public void addHandler(Handler[] newHandlers) {
		for (Handler handler : newHandlers) {
			if (handler == null) {
				throw new NullPointerException();
			}
			if (!handlers.contains(handler))
				this.handlers.add(handler);
		}
	}

	public Handler addHandler(OutputStream out) {
		return addHandler(out, DEFAULT_LEVEL);
	}

	public Handler addHandler(OutputStream out, Level level) {
		if (out == null) {
			throw new NullPointerException();
		}
		Handler handler = new StreamHandler(out, new ProtTestLogFormatter());
		handler.setLevel(level);
		this.handlers.add(handler);
		return handler;
	}

	public Handler addHandler(Writer out) {
		return addHandler(out, DEFAULT_LEVEL);
	}

	public Handler addHandler(Writer out, Level level) {
		if (out == null) {
			throw new NullPointerException();
		}
		Handler handler = new StreamHandler(new WriterOutputStream(out),
				new ProtTestLogFormatter());
		handler.setLevel(level);
		this.handlers.add(handler);
		return handler;
	}

	public Handler addLowLevelHandler(Writer out) {
		if (out == null) {
			throw new NullPointerException();
		}
		Handler handler = new StreamHandler(new WriterOutputStream(out),
				new ProtTestLogFormatter());
		handler.setLevel(Level.ALL);
		lowLevelHandler = handler;
		return handler;
	}

	public Handler getLowLevelHandler() {
		return lowLevelHandler;
	}

	public boolean removeHandler(Handler handler) {
		return this.handlers.remove(handler);
	}

	public Handler[] getHandlers() {
		return handlers.toArray(new Handler[0]);
	}

	public void setStdHandlerLevel(Level newLevel) {
		if (newLevel == null) {
			throw new NullPointerException();
		}
		stdHandler.setLevel(newLevel);
	}

	public Level getStdHandlerLevel() {
		return stdHandler.getLevel();
	}

	public void setLevel(Level newLevel) {
		if (newLevel == null) {
			throw new NullPointerException();
		}
		loggerLevel = newLevel;
	}

	public Level getLevel() {
		return loggerLevel;
	}

	public void info(String text) {
		log(Level.INFO, text);
	}

	public void warning(String text) {
		log(Level.WARNING, text);
	}

	public void config(String text) {
		log(Level.CONFIG, text);
	}

	public void severe(String text) {
		log(Level.SEVERE, text);
	}

	public void fine(String text) {
		log(Level.FINE, text);
	}

	public void finer(String text) {
		log(Level.FINER, text);
	}

	public void finest(String text) {
		log(Level.FINEST, text);
	}

	public void infoln(String text) {
		log(Level.INFO, text + "\n");
		flush();
	}

	public void warningln(String text) {
		log(Level.WARNING, text + "\n");
		flush();
	}

	public void configln(String text) {
		log(Level.CONFIG, text + "\n");
		flush();
	}

	public void severeln(String text) {
		log(Level.SEVERE, text + "\n");
		flush();
	}

	public void fineln(String text) {
		log(Level.FINE, text + "\n");
		flush();
	}

	public void finerln(String text) {
		log(Level.FINER, text + "\n");
		flush();
	}

	public void finestln(String text) {
		log(Level.FINEST, text + "\n");
		flush();
	}

	public static void info(String text, Class loggingClass) {
		log(Level.INFO, text, loggingClass);
	}

	public static void warning(String text, Class loggingClass) {
		log(Level.WARNING, text, loggingClass);
	}

	public static void config(String text, Class loggingClass) {
		log(Level.CONFIG, text, loggingClass);
	}

	public static void severe(String text, Class loggingClass) {
		log(Level.SEVERE, text, loggingClass);
	}

	public static void fine(String text, Class loggingClass) {
		log(Level.FINE, text, loggingClass);
	}

	public static void finer(String text, Class loggingClass) {
		log(Level.FINER, text, loggingClass);
	}

	public static void finest(String text, Class loggingClass) {
		log(Level.FINEST, text, loggingClass);
	}

	public static void infoln(String text, Class loggingClass) {
		log(Level.INFO, text + "\n", loggingClass);
		flush(loggingClass);
	}

	public static void warningln(String text, Class loggingClass) {
		log(Level.WARNING, text + "\n", loggingClass);
		flush(loggingClass);
	}

	public static void configln(String text, Class loggingClass) {
		log(Level.CONFIG, text + "\n", loggingClass);
		flush(loggingClass);
	}

	public static void severeln(String text, Class loggingClass) {
		log(Level.SEVERE, text + "\n", loggingClass);
		flush(loggingClass);
	}

	public static void fineln(String text, Class loggingClass) {
		log(Level.FINE, text + "\n", loggingClass);
		flush(loggingClass);
	}

	public static void finerln(String text, Class loggingClass) {
		log(Level.FINER, text + "\n", loggingClass);
		flush(loggingClass);
	}

	public static void finestln(String text, Class loggingClass) {
		log(Level.FINEST, text + "\n", loggingClass);
		flush(loggingClass);
	}

	public static void log(Level level, String text, Class loggingClass) {
		// default logging + class logging
		getDefaultLogger().log(level, text);
		if (exists(loggingClass))
			getLogger(loggingClass.getName(), false).log(level, text);
	}

	public void log(Level level, String text) {
		log(new LogRecord(level, text));
	}

	public void log(LogRecord lr) {

		if (lr.getLevel().intValue() > loggerLevel.intValue()
				&& loggerLevel.intValue() != Level.OFF.intValue()) {

			for (Handler handler : handlers)
				handler.publish(lr);

		}

	}

	public static void lowLevelLog(String text) {
		if (getDefaultLogger().lowLevelHandler != null) {
			LogRecord lr = new LogRecord(Level.INFO, text + "\n");
			getDefaultLogger().lowLevelHandler.publish(lr);
			getDefaultLogger().lowLevelHandler.flush();
		}
	}

	public void flush() {
		for (Handler handler : handlers)
			handler.flush();
	}

	public static void flush(Class loggingClass) {
		getDefaultLogger().flush();
		if (exists(loggingClass))
			getLogger(loggingClass.getName(), false).flush();
	}
}
