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/*
   Copyright 2018 Nationale-Nederlanden

   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.
*/
package nl.nn.testtool.util;

import java.io.IOException;
import java.net.URL;
import java.util.Properties;

import org.apache.log4j.Logger;

/**
 * @author Jaco de Groot
 */
public class LogUtil {
	public static final String DEFAULT_TEST_TOOL_PROPERTIES_RESOURCE_NAME = "testtool.properties";
	public static final String DEBUG_LOG_PREFIX = "Test Tool LogUtil class ";
	public static final String DEBUG_LOG_SUFFIX = "";
	public static final String WARN_LOG_PREFIX = DEBUG_LOG_PREFIX;
	public static final String WARN_LOG_SUFFIX = ", leaving it up to log4j's default initialization procedure: http://logging.apache.org/log4j/docs/manual.html#defaultInit";
	private static LoggerProvider loggerProvider;
	static {
		String testToolPropertiesResourceName = System.getProperty(DEFAULT_TEST_TOOL_PROPERTIES_RESOURCE_NAME);
		if (testToolPropertiesResourceName == null) {
			testToolPropertiesResourceName = DEFAULT_TEST_TOOL_PROPERTIES_RESOURCE_NAME;
		}
		Properties properties = getProperties(DEBUG_LOG_PREFIX, DEBUG_LOG_SUFFIX, WARN_LOG_PREFIX, WARN_LOG_SUFFIX, testToolPropertiesResourceName);
		if (properties != null) {
			String loggerProviderClass = properties.getProperty("LoggerProvider.class");
			if (loggerProviderClass == null) {
				System.out.println(WARN_LOG_PREFIX + "did not find LoggerProvider.class property" + WARN_LOG_SUFFIX);
			} else {
				try {
					loggerProvider = (LoggerProvider)LogUtil.class.getClassLoader().loadClass(loggerProviderClass).newInstance();
				} catch(ClassNotFoundException e) {
					System.out.println(WARN_LOG_PREFIX + "got ClassNotFoundException (" + e.getMessage() + ")" + WARN_LOG_SUFFIX);
				} catch (InstantiationException e) {
					System.out.println(WARN_LOG_PREFIX + "got InstantiationException (" + e.getMessage() + ")" + WARN_LOG_SUFFIX);
				} catch (IllegalAccessException e) {
					System.out.println(WARN_LOG_PREFIX + "got IllegalAccessException (" + e.getMessage() + ")" + WARN_LOG_SUFFIX);
				}
			}
		}
	}
	
	public static Logger getLogger(String name) { 
		Logger logger = null;
		if (loggerProvider == null) {
			logger = Logger.getLogger(name);
		} else {
			logger = loggerProvider.getLogger(name);
		}
		return logger;
	}

	public static Logger getLogger(Class clazz) { 
		return getLogger(clazz.getName());
	}

	public static Logger getLogger(Object object) { 
		return getLogger(object.getClass());
	}

	public static Properties getProperties(String debugLogPrefix,
			String debugLogSuffix, String warnLogPrefix, String warnLogSuffix,
			String resourceName) {
		Properties properties = null;
		URL url = LogUtil.class.getClassLoader().getResource(resourceName);
		if (url == null) {
			System.out.println(warnLogPrefix + "did not find " + resourceName + warnLogSuffix);
		} else {
			properties = getProperties(debugLogPrefix, debugLogSuffix, warnLogPrefix, warnLogSuffix, url);
		}
		return properties;
	}

	public static Properties getProperties(String debugLogPrefix,
			String debugLogSuffix, String warnLogPrefix, String warnLogSuffix,
			URL url) {
		Properties properties = new Properties();
		try {
			properties.load(url.openStream());
			if (System.getProperty("log4j.debug") != null) {
				System.out.println(debugLogPrefix + "loaded properties from " + url.toString() + debugLogSuffix);
			}
		} catch (IOException e) {
			properties = null;
			System.out.println(warnLogPrefix + "could not read " + url + " (" + e.getClass().getName() + ": " + e.getMessage() + ")" + warnLogSuffix);
		}
		return properties;
	}

}