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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2010, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.logging;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import java.text.MessageFormat;
import org.slf4j.spi.LocationAwareLogger;

final class Slf4jLocationAwareLogger extends Logger {

    private static final long serialVersionUID = 8685757928087758380L;

    private static final Object[] EMPTY = new Object[0];
    private static final boolean POST_1_6;
    private static final Method LOG_METHOD;

    static {
        Method[] methods = LocationAwareLogger.class.getDeclaredMethods();
        Method logMethod = null;
        boolean post16 = false;
        for (Method method : methods) {
            if (method.getName().equals("log")) {
                logMethod = method;
                Class[] parameterTypes = method.getParameterTypes();
                post16 = parameterTypes.length == 6;
            }
        }
        if (logMethod == null) {
            throw new NoSuchMethodError("Cannot find LocationAwareLogger.log() method");
        }
        POST_1_6 = post16;
        LOG_METHOD = logMethod;
    }

    private final LocationAwareLogger logger;

    Slf4jLocationAwareLogger(final String name, final LocationAwareLogger logger) {
        super(name);
        this.logger = logger;
    }

    public boolean isEnabled(final Level level) {
        if (level != null) switch (level) {
            case FATAL: return logger.isErrorEnabled();
            case ERROR: return logger.isErrorEnabled();
            case WARN:  return logger.isWarnEnabled();
            case INFO:  return logger.isInfoEnabled();
            case DEBUG: return logger.isDebugEnabled();
            case TRACE: return logger.isTraceEnabled();
        }
        return true;
    }

    protected void doLog(final Level level, final String loggerClassName, final Object message, final Object[] parameters, final Throwable thrown) {
        if (isEnabled(level)) {
            final String text = parameters == null || parameters.length == 0 ? String.valueOf(message) : MessageFormat.format(String.valueOf(message), parameters);
            doLog(logger, loggerClassName, translate(level), text, thrown);
        }
    }

    protected void doLogf(final Level level, final String loggerClassName, final String format, final Object[] parameters, final Throwable thrown) {
        if (isEnabled(level)) {
            final String text = parameters == null ? String.format(format) : String.format(format, parameters);
            doLog(logger, loggerClassName, translate(level), text, thrown);
        }
    }

    private static void doLog(LocationAwareLogger logger, String className, int level, String text, Throwable thrown) {
        try {
            if (POST_1_6) {
                LOG_METHOD.invoke(logger, null, className, Integer.valueOf(level), text, EMPTY, thrown);
            } else {
                LOG_METHOD.invoke(logger, null, className, Integer.valueOf(level), text, thrown);
            }
        } catch (InvocationTargetException e) {
            try {
                throw e.getCause();
            } catch (RuntimeException ex) {
                throw ex;
            } catch (Error er) {
                throw er;
            } catch (Throwable throwable) {
                throw new UndeclaredThrowableException(throwable);
            }
        } catch (IllegalAccessException e) {
            throw new IllegalAccessError(e.getMessage());
        }
    }

    private static int translate(Level level) {
        if (level != null) switch (level) {
            case FATAL:
            case ERROR: return LocationAwareLogger.ERROR_INT;
            case WARN:  return LocationAwareLogger.WARN_INT;
            case INFO:  return LocationAwareLogger.INFO_INT;
            case DEBUG: return LocationAwareLogger.DEBUG_INT;
            case TRACE: return LocationAwareLogger.TRACE_INT;
        }
        return LocationAwareLogger.TRACE_INT;
    }
}