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/**
 * 	Copyright (C) August 2019 Raúl Eduardo González Argote - [email protected]
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE as published by
 * the Free Software Foundation, version 3, 29 June 2007
 *
 * 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.
 *
 *                   GNU LESSER GENERAL PUBLIC LICENSE
 *                        Version 3, 29 June 2007
 *
 *  Copyright (C) 2007 Free Software Foundation, Inc. 
 *  Everyone is permitted to copy and distribute verbatim copies
 *  of this license document, but changing it is not allowed.
 *
 *
 *   This version of the GNU Lesser General Public License incorporates
 * the terms and conditions of version 3 of the GNU General Public
 * License, supplemented by the additional permissions listed below.
 *
 *   0. Additional Definitions.
 *
 *   As used herein, "this License" refers to version 3 of the GNU Lesser
 * General Public License, and the "GNU GPL" refers to version 3 of the GNU
 * General Public License.
 *
 *   "The Library" refers to a covered work governed by this License,
 * other than an Application or a Combined Work as defined below.
 *
 *   An "Application" is any work that makes use of an interface provided
 * by the Library, but which is not otherwise based on the Library.
 * Defining a subclass of a class defined by the Library is deemed a mode
 * of using an interface provided by the Library.
 *
 *   A "Combined Work" is a work produced by combining or linking an
 * Application with the Library.  The particular version of the Library
 * with which the Combined Work was made is also called the "Linked
 * Version".
 *
 *   The "Minimal Corresponding Source" for a Combined Work means the
 * Corresponding Source for the Combined Work, excluding any source code
 * for portions of the Combined Work that, considered in isolation, are
 * based on the Application, and not on the Linked Version.
 *
 *   The "Corresponding Application Code" for a Combined Work means the
 * object code and/or source code for the Application, including any data
 * and utility programs needed for reproducing the Combined Work from the
 * Application, but excluding the System Libraries of the Combined Work.
 *
 *   1. Exception to Section 3 of the GNU GPL.
 *
 *   You may convey a covered work under sections 3 and 4 of this License
 * without being bound by section 3 of the GNU GPL.
 *
 *   2. Conveying Modified Versions.
 *
 *   If you modify a copy of the Library, and, in your modifications, a
 * facility refers to a function or data to be supplied by an Application
 * that uses the facility (other than as an argument passed when the
 * facility is invoked), then you may convey a copy of the modified
 * version:
 *
 *    a) under this License, provided that you make a good faith effort to
 *    ensure that, in the event an Application does not supply the
 *    function or data, the facility still operates, and performs
 *    whatever part of its purpose remains meaningful, or
 *
 *    b) under the GNU GPL, with none of the additional permissions of
 *    this License applicable to that copy.
 *
 *   3. Object Code Incorporating Material from Library Header Files.
 *
 *   The object code form of an Application may incorporate material from
 * a header file that is part of the Library.  You may convey such object
 * code under terms of your choice, provided that, if the incorporated
 * material is not limited to numerical parameters, data structure
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 * (ten or fewer lines in length), you do both of the following:
 *
 *    a) Give prominent notice with each copy of the object code that the
 *    Library is used in it and that the Library and its use are
 *    covered by this License.
 *
 *    b) Accompany the object code with a copy of the GNU GPL and this license
 *    document.
 *
 *   4. Combined Works.
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 *   You may convey a Combined Work under terms of your choice that,
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 * portions of the Library contained in the Combined Work and reverse
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 *    a) Give prominent notice with each copy of the Combined Work that
 *    the Library is used in it and that the Library and its use are
 *    covered by this License.
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 *    document.
 *
 *    c) For a Combined Work that displays copyright notices during
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 *    these notices, as well as a reference directing the user to the
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 *    d) Do one of the following:
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 *        the Linked Version to produce a modified Combined Work, in the
 *        manner specified by section 6 of the GNU GPL for conveying
 *        Corresponding Source.
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 *        Library.  A suitable mechanism is one that (a) uses at run time
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 *    Information in the manner specified by section 6 of the GNU GPL
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 *   5. Combined Libraries.
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 *   You may place library facilities that are a work based on the
 * Library side by side in a single library together with other library
 * facilities that are not Applications and are not covered by this
 * License, and convey such a combined library under terms of your
 * choice, if you do both of the following:
 *
 *    a) Accompany the combined library with a copy of the same work based
 *    on the Library, uncombined with any other library facilities,
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 *    b) Give prominent notice with the combined library that part of it
 *    is a work based on the Library, and explaining where to find the
 *    accompanying uncombined form of the same work.
 *
 *   6. Revised Versions of the GNU Lesser General Public License.
 *
 *   The Free Software Foundation may publish revised and/or new versions
 * of the GNU Lesser General Public License from time to time. Such new
 * versions will be similar in spirit to the present version, but may
 * differ in detail to address new problems or concerns.
 *
 *   Each version is given a distinguishing version number. If the
 * Library as you received it specifies that a certain numbered version
 * of the GNU Lesser General Public License "or any later version"
 * applies to it, you have the option of following the terms and
 * conditions either of that published version or of any later version
 * published by the Free Software Foundation. If the Library as you
 * received it does not specify a version number of the GNU Lesser
 * General Public License, you may choose any version of the GNU Lesser
 * General Public License ever published by the Free Software Foundation.
 *
 *   If the Library as you received it specifies that a proxy can decide
 * whether future versions of the GNU Lesser General Public License shall
 * apply, that proxy's public statement of acceptance of any version is
 * permanent authorization for you to choose that version for the
 * Library.
 */
package dev.rafex.ether.rest.logger;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;

import org.eclipse.jetty.util.Loader;
import org.eclipse.jetty.util.log.AbstractLogger;
import org.eclipse.jetty.util.log.Log;

public class Logger extends AbstractLogger {

	private final java.util.logging.Logger LOGGER = java.util.logging.Logger.getLogger(Logger.class.getName());

	static {
		try {
			final ClassLoader loader = Thread.currentThread().getContextClassLoader();
			final InputStream inputStream = loader.getResourceAsStream(Logger.LOGGING_PROPERTIES);
			LogManager.getLogManager().readConfiguration(inputStream);
		} catch (SecurityException | IOException e) {
			e.printStackTrace();
		}
	}

	private static final String THIS_CLASS = Logger.class.getName();
	private static final String LOGGING_PROPERTIES = "logging.properties";
	private static final String JETTY_PROPERTIES = "jetty-logging.properties";

	private final java.util.logging.Logger logger;
	private final String name;
	private final Properties properties = new Properties();
	private final boolean source = Boolean
			.parseBoolean(properties.getProperty("org.eclipse.jetty.util.log.SOURCE", properties.getProperty("org.eclipse.jetty.util.log.logger.SOURCE", "true")));
	private Level configuredLevel;

	public Logger() {
		this("org.eclipse.jetty.util.log.logger");
	}

	public Logger(final String name) {
		this.name = name;
		logger = java.util.logging.Logger.getLogger(this.name);

		loadProperties(Logger.JETTY_PROPERTIES, properties);

		switch (lookupLoggingLevel(properties, name)) {
		case LEVEL_ALL:
			logger.setLevel(Level.ALL);
			break;
		case LEVEL_DEBUG:
			logger.setLevel(Level.FINE);
			break;
		case LEVEL_INFO:
			logger.setLevel(Level.INFO);
			break;
		case LEVEL_WARN:
			logger.setLevel(Level.WARNING);
			break;
		case LEVEL_OFF:
			logger.setLevel(Level.OFF);
			break;
		case LEVEL_DEFAULT:
		default:
			break;
		}

		configuredLevel = logger.getLevel();

	}

	@Override
	protected org.eclipse.jetty.util.log.Logger newLogger(final String name) {
		return new Logger(name);
	}

	@Override
	public String getName() {
		return logger.getName();
	}

	@Override
	public void warn(final String msg, final Object... args) {
		if (logger.isLoggable(Level.WARNING)) {
			log(Level.WARNING, format(msg, args), null);
		}
	}

	@Override
	public void warn(final Throwable thrown) {
		if (logger.isLoggable(Level.WARNING)) {
			log(Level.WARNING, "", thrown);
		}
	}

	@Override
	public void warn(final String msg, final Throwable thrown) {
		if (logger.isLoggable(Level.WARNING)) {
			log(Level.WARNING, msg, thrown);
		}
	}

	@Override
	public void info(final String msg, final Object... args) {
		if (logger.isLoggable(Level.INFO)) {
			log(Level.INFO, format(msg, args), null);
		}
	}

	@Override
	public void info(final Throwable thrown) {
		if (logger.isLoggable(Level.INFO)) {
			log(Level.INFO, "", thrown);
		}
	}

	@Override
	public void info(final String msg, final Throwable thrown) {
		if (logger.isLoggable(Level.INFO)) {
			log(Level.INFO, msg, thrown);
		}
	}

	@Override
	public boolean isDebugEnabled() {
		return logger.isLoggable(Level.FINE);
	}

	@Override
	public void setDebugEnabled(final boolean enabled) {
		if (enabled) {
			configuredLevel = logger.getLevel();
			logger.setLevel(Level.FINE);
		} else {
			logger.setLevel(configuredLevel);
		}
	}

	@Override
	public void debug(final String msg, final Object... args) {
		if (logger.isLoggable(Level.FINE)) {
			log(Level.FINE, format(msg, args), null);
		}
	}

	@Override
	public void debug(final String msg, final long arg) {
		if (logger.isLoggable(Level.FINE)) {
			log(Level.FINE, format(msg, arg), null);
		}
	}

	@Override
	public void debug(final Throwable thrown) {
		if (logger.isLoggable(Level.FINE)) {
			log(Level.FINE, "", thrown);
		}
	}

	@Override
	public void debug(final String msg, final Throwable thrown) {
		if (logger.isLoggable(Level.FINE)) {
			log(Level.FINE, msg, thrown);
		}
	}

	@Override
	public void ignore(final Throwable ignored) {
		if (logger.isLoggable(Level.FINEST)) {
			log(Level.FINEST, Log.IGNORED, ignored);
		}
	}

	public void log(final Level level, final String msg, final Throwable thrown) {
		final LogRecord record = new LogRecord(level, msg);
		if (thrown != null) {
			record.setThrown(thrown);
		}
		record.setLoggerName(logger.getName());
		if (source) {
			final StackTraceElement[] stack = new Throwable().getStackTrace();
			for (final StackTraceElement e : stack) {
				if (!e.getClassName().equals(THIS_CLASS)) {
					record.setSourceClassName(e.getClassName());
					record.setSourceMethodName(e.getMethodName());
					break;
				}
			}
		}
		logger.log(record);
	}

	private String format(String msg, final Object... args) {
		msg = String.valueOf(msg); // Avoids NPE
		final String braces = "{}";
		final StringBuilder builder = new StringBuilder();
		int start = 0;
		for (final Object arg : args) {
			final int bracesIndex = msg.indexOf(braces, start);
			if (bracesIndex < 0) {
				builder.append(msg.substring(start));
				builder.append(" ");
				builder.append(arg);
				start = msg.length();
			} else {
				builder.append(msg, start, bracesIndex);
				builder.append(arg);
				start = bracesIndex + braces.length();
			}
		}
		builder.append(msg.substring(start));
		return builder.toString();
	}

	private void loadProperties(final String resourceName, final Properties props) {
		final URL testProps = Loader.getResource(resourceName);
		if (testProps != null) {
			try (InputStream in = testProps.openStream()) {
				final Properties p = new Properties();
				p.load(in);
				for (final Object key : p.keySet()) {
					final Object value = p.get(key);
					if (value != null) {
						props.put(key, value);
					}
				}
			} catch (final IOException e) {
				LOGGER.warning("[WARN] Error loading logging config: " + testProps);
				e.printStackTrace();
			}
		}
	}
}