/**
 * ============LICENSE_START====================================================
 * org.onap.aaf
 * ===========================================================================
 * Copyright (c) 2018 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====================================================
 *
 */

package org.onap.aaf.misc.env.log4j;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;

public class LogFileNamer {
	private final String root;
	private final String ending;
	private final String dir; 
	
	public LogFileNamer(final String dir, final String root) {
		this.dir = dir;
		if(root==null || "".equals(root) || root.endsWith("/")) {
			this.root = root;
		} else {
			this.root = root + "-";
		}
		ending = new SimpleDateFormat("YYYYMMdd").format(new Date());
	}
	
	public LogFileNamer noPID() {
		return this;
	}
	
	private static final String FILE_FORMAT_STR = "%s/%s%s%s_%d.log";
	/**
	 * Accepts a String.
	 * If Separated by "|" then first part is the Appender name, and the second is used in the FileNaming
	 * (This is to allow for shortened Logger names, and more verbose file names)
	 * ONAP: jna code has license issues.  Just do Date + Unique Number
	 * 
	 * @param appender
	 * 
	 * returns the String Appender
	 * @throws IOException 
	 */
	public String setAppender(String appender) throws IOException {
		String filename;
		int i=0;
		File f;
		while((f=new File(filename=String.format(FILE_FORMAT_STR, dir,root, appender, ending,i))).exists()) {
			++i;
		};
		f.createNewFile();
		System.setProperty(
			"LOG4J_FILENAME_"+appender,
			filename);
		return appender;
	}

	public void configure(final String path, final String fname, final String log_level) throws IOException {
		final String fullPath=path+'/'+fname;
		if(new File(fullPath).exists()) {
			org.apache.log4j.PropertyConfigurator.configureAndWatch(fullPath,60*1000L);
		} else {
			URL rsrc = ClassLoader.getSystemResource(fname);
			if(rsrc==null) {
				String msg = "Neither File: " + path + '/' + fname + " nor resource on Classpath " + fname + " exist" ;
				throw new IOException(msg);
			}
			org.apache.log4j.PropertyConfigurator.configure(rsrc);
		}
		
	}
}