/**
 ********************************************************************************
 * Copyright (c) 2018-2019 Robert Bosch GmbH.
 * 
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Robert Bosch GmbH - initial API and implementation
 ********************************************************************************
 */

package org.eclipse.app4mc.transformation.extensions.base.templates

import java.util.Properties
import org.apache.log4j.LogManager
import org.apache.log4j.Logger
import org.eclipse.app4mc.transformation.extensions.CustomObjectsStore
import org.apache.log4j.ConsoleAppender
import org.apache.log4j.PatternLayout
import com.google.inject.Injector

public abstract class AbstractTransformer{
	
	static public CustomObjectsStore customObjsStore = new CustomObjectsStore

	static public Logger logger

    static public Properties properties
	
	static public Injector injector

	/**
	 * Provides Log4J logger which can be used by the corresponding Transformer classes.
	 * Note: Root Logger is initialized during the startup and the corresponding Appenders are hooked to it accordingly.
	 * In case, if user specific appenders are to be attached to the logger, this method should be overridden and new Appenders should be attached to the logger 
	 * 
	 */
	protected def Logger getLogger() {
		if (logger === null) {
			logger = createLogger
			logger.addAppender(new ConsoleAppender(new PatternLayout))
		}
		return logger
	}

	protected def Logger createLogger(){
			logger = LogManager.getLogger("com.bosch.m2m.app4mc.simulation");
		
	}
	protected def String getProperty(String propKey) {

		if (properties === null) {

			if (customObjsStore !== null) {
				properties = customObjsStore.getInstance(Properties)
				if (properties === null) {
					throw new NullPointerException(
						"Properties object not set in CustomObjectsStore : Verify the custom Google Guice Module configuration ")
				}

			} else {
				throw new NullPointerException(
					"CustomObjectsStore object not binded: Verify the custom Google Guice Module configuration ")
			}
		}

		val value = properties.get(propKey)

		if (value === null) {
			throw new NullPointerException("Request input key : \"" + propKey +
				"\" not supplied in the input properties file")
		}

		return value.toString

	}

/* 	public def doGenerate() '''
 * 	 
 * 		«  val instance = customObjsStore.getInstance(Properties)»
 * 		«instance.get("log_file")»
 * 		«getLogger.warn("logging info about transformation of :"+this.class.name)	»
 * 	 ----------> «this.class.name»
 * 	 ===============> «properties.get("log_file")»
 * 	'''
 */
}