/*******************************************************************************
 * ============LICENSE_START====================================================
 * * org.onap.aaf
 * * ===========================================================================
 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * * ===========================================================================
 * * Licensed 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.
 * * ============LICENSE_END====================================================
 * *
 * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * *
 ******************************************************************************/
package org.onap.aaf.inno.env.impl;

import java.io.PrintWriter;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.onap.aaf.inno.env.APIException;
import org.onap.aaf.inno.env.LogTarget;
import org.onap.aaf.inno.env.util.StringBuilderWriter;

/**
 * Many services have chosen to use Log4J for their lower level Logging Implementation.  This LogTarget will allow
 * any of the messages sent to be set to the appropriate Log4J level.
 * 
 *
 */
public class Log4JLogTarget implements LogTarget {
	private Level level;
	private Logger log;

	public Log4JLogTarget(String loggerName, Level level) throws APIException {
		this.level = level;
		if (loggerName != null && loggerName.length() > 0) {
			log = Logger.getLogger(loggerName);
		} else {
			log = Logger.getRootLogger();
		}
	}

	// @Override
	public boolean isLoggable() {
		return log.isEnabledFor(level);
	}

	// @Override
	public void log(Object... msgs) {
		log(null, msgs);
	}

	// @Override
	public void log(Throwable e, Object... msgs) {
		if (log.isEnabledFor(level)) {
			StringBuilder sb = new StringBuilder();
			
			String msg;
			if (e != null) {
				e.printStackTrace(new PrintWriter(new StringBuilderWriter(sb)));
			}
			for (int i = 0; i < msgs.length; ++i) {
				if(msgs[i]!=null) {
					msg = msgs[i].toString();
					if (msg != null && msg.length() > 0) {
						int sbl = sb.length();
						if (sbl > 0) {
							char last = sb.charAt(sbl - 1);
							if (" (.".indexOf(last) < 0
									&& "().".indexOf(msg.charAt(0)) < 0)
								sb.append(' ');
						}
						sb.append(msg);
					}
				}
			}
			log.log(level, sb.toString());
		}
	}

	/* (non-Javadoc)
	 * @see com.att.inno.env.LogTarget#printf(java.lang.String, java.lang.String[])
	 */
	@Override
	public void printf(String fmt, Object ... vars) {
		if(log.isEnabledFor(level)) {
			log.log(level,String.format(fmt,vars));
		}
	}

	public static void setLog4JEnv(String loggerName, BasicEnv env) throws APIException {
			env.fatal = new Log4JLogTarget(loggerName,Level.FATAL);
			env.error = new Log4JLogTarget(loggerName,Level.ERROR);
			env.warn = env.audit = env.init = new Log4JLogTarget(loggerName,Level.WARN);
			env.info = new Log4JLogTarget(loggerName,Level.INFO);
			env.debug = new Log4JLogTarget(loggerName,Level.DEBUG);
			env.trace = new Log4JLogTarget(loggerName,Level.TRACE);
	}
	
}