/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.slf4j.jul;

import java.util.logging.Level;
import java.util.logging.LogRecord;

import org.slf4j.Logger;
import org.slf4j.Marker;
import org.slf4j.event.EventConstants;
import org.slf4j.event.LoggingEvent;
import org.slf4j.helpers.AbstractLogger;
import org.slf4j.helpers.FormattingTuple;
import org.slf4j.helpers.LegacyAbstractLogger;
import org.slf4j.helpers.MessageFormatter;
import org.slf4j.helpers.NormalizedParameters;
import org.slf4j.helpers.SubstituteLogger;
import org.slf4j.spi.LocationAwareLogger;

/**
 * A wrapper over {@link java.util.logging.Logger java.util.logging.Logger} in
 * conformity with the {@link Logger} interface. Note that the logging levels
 * mentioned in this class refer to those defined in the java.util.logging
 * package.
 * 
 * @author Ceki G&uuml;lc&uuml;
 * @author Peter Royal
 */
public final class JDK14LoggerAdapter extends LegacyAbstractLogger implements LocationAwareLogger {

	private static final long serialVersionUID = -8053026990503422791L;

	transient final java.util.logging.Logger logger;

	// WARN: JDK14LoggerAdapter constructor should have only package access so
	// that only JDK14LoggerFactory be able to create one.
	JDK14LoggerAdapter(java.util.logging.Logger logger) {
		this.logger = logger;
		this.name = logger.getName();
	}

	/**
	 * Is this logger instance enabled for the FINEST level?
	 * 
	 * @return True if this Logger is enabled for level FINEST, false otherwise.
	 */
	public boolean isTraceEnabled() {
		return logger.isLoggable(Level.FINEST);
	}

	/**
	 * Is this logger instance enabled for the FINE level?
	 * 
	 * @return True if this Logger is enabled for level FINE, false otherwise.
	 */
	public boolean isDebugEnabled() {
		return logger.isLoggable(Level.FINE);
	}

	/**
	 * Is this logger instance enabled for the INFO level?
	 * 
	 * @return True if this Logger is enabled for the INFO level, false otherwise.
	 */
	public boolean isInfoEnabled() {
		return logger.isLoggable(Level.INFO);
	}

	/**
	 * Is this logger instance enabled for the WARNING level?
	 * 
	 * @return True if this Logger is enabled for the WARNING level, false
	 *         otherwise.
	 */
	public boolean isWarnEnabled() {
		return logger.isLoggable(Level.WARNING);
	}

	/**
	 * Is this logger instance enabled for level SEVERE?
	 * 
	 * @return True if this Logger is enabled for level SEVERE, false otherwise.
	 */
	public boolean isErrorEnabled() {
		return logger.isLoggable(Level.SEVERE);
	}

//    /**
//     * Log the message at the specified level with the specified throwable if any.
//     * This method creates a LogRecord and fills in caller date before calling
//     * this instance's JDK14 logger.
//     * 
//     * See bug report #13 for more details.
//     * 
//     * @param level
//     * @param msg
//     * @param t
//     */
//    private void log(String callerFQCN, Level level, String msg, Throwable t) {
//        // millis and thread are filled by the constructor
//        LogRecord record = new LogRecord(level, msg);
//        record.setLoggerName(getName());
//        record.setThrown(t);
//        // Note: parameters in record are not set because SLF4J only
//        // supports a single formatting style
//        fillCallerData(callerFQCN, record);
//        logger.log(record);
//    }

	/**
	 * Log the message at the specified level with the specified throwable if any.
	 * This method creates a LogRecord and fills in caller date before calling this
	 * instance's JDK14 logger.
	 */
	@Override
	protected void handleNormalizedLoggingCall(org.slf4j.event.Level level, Marker marker, String msg, Object[] args,
			Throwable throwable) {
		innerNormalizedLoggingCallHandler(getFullyQualifiedCallerName(), level, marker, msg, args, throwable);
	}

	
	private void innerNormalizedLoggingCallHandler(String fqcn, org.slf4j.event.Level level, Marker marker, String msg, Object[] args,
			Throwable throwable) {
		// millis and thread are filled by the constructor
		Level julLevel = slf4jLevelToJULLevel(level);
		String formattedMessage = MessageFormatter.basicArrayFormat(msg, args);
		LogRecord record = new LogRecord(julLevel, formattedMessage);

		// https://jira.qos.ch/browse/SLF4J-13
		record.setLoggerName(getName());
		record.setThrown(throwable);
		// Note: parameters in record are not set because SLF4J only
		// supports a single formatting style
		// See also https://jira.qos.ch/browse/SLF4J-10
		fillCallerData(fqcn, record);
		logger.log(record);
	}

	
	@Override
	protected String getFullyQualifiedCallerName() {
		return SELF;
	}
	
	
	@Override
	public void log(Marker marker, String callerFQCN, int slf4jLevelInt, String message, Object[] arguments,
			Throwable throwable) {

		org.slf4j.event.Level slf4jLevel = org.slf4j.event.Level.intToLevel(slf4jLevelInt);
		Level julLevel = slf4jLevelIntToJULLevel(slf4jLevelInt);
		
		if (logger.isLoggable(julLevel)) {
			NormalizedParameters np = NormalizedParameters.normalize(message, arguments, throwable);
			innerNormalizedLoggingCallHandler(callerFQCN, slf4jLevel, marker, np.getMessage(), np.getArguments(), np.getThrowable());
		}
	}

	
	/**
	 * Fill in caller data if possible.
	 * 
	 * @param record The record to update
	 */
	final private void fillCallerData(String callerFQCN, LogRecord record) {
		StackTraceElement[] steArray = new Throwable().getStackTrace();

		int selfIndex = -1;
		for (int i = 0; i < steArray.length; i++) {
			final String className = steArray[i].getClassName();

			if (barrierMatch(callerFQCN, className)) {
				selfIndex = i;
				break;
			}
		}

		int found = -1;
		for (int i = selfIndex + 1; i < steArray.length; i++) {
			final String className = steArray[i].getClassName();
			if (!(barrierMatch(callerFQCN, className))) {
				found = i;
				break;
			}
		}

		if (found != -1) {
			StackTraceElement ste = steArray[found];
			// setting the class name has the side effect of setting
			// the needToInferCaller variable to false.
			record.setSourceClassName(ste.getClassName());
			record.setSourceMethodName(ste.getMethodName());
		}
	}

	static String SELF = JDK14LoggerAdapter.class.getName();
	
	static String SUPER = LegacyAbstractLogger.class.getName();
	static String SUPER_OF_SUPER = AbstractLogger.class.getName();
	static String SUBSTITUE = SubstituteLogger.class.getName();

	static String BARRIER_CLASSES[] = new String[] { SUPER_OF_SUPER, SUPER, SELF, SUBSTITUE };

	private boolean barrierMatch(String callerFQCN, String candidateClassName) {
		if (candidateClassName.equals(callerFQCN))
			return true;
		for (String barrierClassName : BARRIER_CLASSES) {
			if (barrierClassName.equals(candidateClassName)) {
				return true;
			}
		}
		return false;
	}


	private static Level slf4jLevelIntToJULLevel(int levelInt) {
		org.slf4j.event.Level slf4jLevel = org.slf4j.event.Level.intToLevel(levelInt);
		return slf4jLevelToJULLevel(slf4jLevel);
	}

	private static Level slf4jLevelToJULLevel(org.slf4j.event.Level slf4jLevel) {
		Level julLevel;
		switch (slf4jLevel) {
		case TRACE:
			julLevel = Level.FINEST;
			break;
		case DEBUG:
			julLevel = Level.FINE;
			break;
		case INFO:
			julLevel = Level.INFO;
			break;
		case WARN:
			julLevel = Level.WARNING;
			break;
		case ERROR:
			julLevel = Level.SEVERE;
			break;
		default:
			throw new IllegalStateException("Level " + slf4jLevel + " is not recognized.");
		}
		return julLevel;
	}

	/**
	 * @since 1.7.15
	 */
	public void log(LoggingEvent event) {
		// assumes that the invocation is made from a substitute logger
		// this assumption might change in the future with the advent of a fluent API
		Level julLevel = slf4jLevelToJULLevel(event.getLevel());
		if (logger.isLoggable(julLevel)) {
			LogRecord record = eventToRecord(event, julLevel);
			logger.log(record);
		}
	}

	private LogRecord eventToRecord(LoggingEvent event, Level julLevel) {
		String format = event.getMessage();
		Object[] arguments = event.getArgumentArray();
		FormattingTuple ft = MessageFormatter.arrayFormat(format, arguments);
		if (ft.getThrowable() != null && event.getThrowable() != null) {
			throw new IllegalArgumentException(
					"both last element in argument array and last argument are of type Throwable");
		}

		Throwable t = event.getThrowable();
		if (ft.getThrowable() != null) {
			t = ft.getThrowable();
			throw new IllegalStateException("fix above code");
		}

		LogRecord record = new LogRecord(julLevel, ft.getMessage());
		record.setLoggerName(event.getLoggerName());
		record.setMillis(event.getTimeStamp());
		record.setSourceClassName(EventConstants.NA_SUBST);
		record.setSourceMethodName(EventConstants.NA_SUBST);

		record.setThrown(t);
		return record;
	}

}
