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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package de.extra.client.logging;

import java.io.File;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.joran.JoranConfigurator;
import ch.qos.logback.core.joran.spi.JoranException;
import de.extra.client.core.ReturnCode;

/**
 * @author Thorsten Vogel
 * @version $Id: LogFileHandler.java,v 1.2 2012/01/23 14:51:00 zf4iks1 Exp $
 */
public class LogFileHandler {

	private static final String LOGBACK_CONFIG = "logging-config.xml";

	private static final Logger LOG = LoggerFactory
			.getLogger(LogFileHandler.class);

	private final File logDirectory;

	private final File configurationDirectory;

	/**
	 * @param logDirectory
	 * @param configurationDirectory
	 */
	public LogFileHandler(final File logDirectory,
			final File configurationDirectory) {
		Assert.notNull(logDirectory, "logDirectory darf nicht leer sein.");
		Assert.notNull(configurationDirectory,
				"configurationDirectory darf nicht leer sein.");
		this.logDirectory = logDirectory;
		this.configurationDirectory = configurationDirectory;
		initializeLogFile();
	}

	private void initializeLogFile() {
		LoggerContext context = (LoggerContext) LoggerFactory
				.getILoggerFactory();
		JoranConfigurator configurator = new JoranConfigurator();
		configurator.setContext(context);
		context.reset();
		context.putProperty("logfilepath", logDirectory.getAbsolutePath());
		// override default configuration
		try {
			configurator.doConfigure(new File(configurationDirectory,
					LOGBACK_CONFIG));
		} catch (JoranException e) {
			exitWithError(e.getMessage(), e);
		}
		LOG.debug("successfully configured log system, file={}",
				logDirectory.getAbsolutePath());
	}

	private void exitWithError(final String message, final Throwable exception) {
		LOG.error("Fehler bei der Konfiguration des Loggingsystems: {}",
				message, exception);
		System.exit(ReturnCode.TECHNICAL.getCode());
	}

}