/*******************************************************************************
 * Copyright 2013-2014 alladin-IT GmbH
 * 
 * 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 at.alladin.rmbt.qos.testserver.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Properties;

import at.alladin.rmbt.qos.testserver.ServerPreferences.TestServerServiceEnum;
import at.alladin.rmbt.qos.testserver.service.EventJob;

/**
 * 
 * @author lb
 *
 */
public class RuntimeGuardService extends EventJob<String> {

	/**
	 * 
	 */
	public final static String TAG = RuntimeGuardService.class.getCanonicalName();

	/**
	 * 
	 */
	public final static String GUARD_FILE = "guard.properties";

	/**
	 * 
	 */
	public final static String PROPERTY_KEY_STATUS = "status";
	public final static String PROPERTY_VALUE_STATUS_UP = "up";
	public final static String PROPERTY_VALUE_STATUS_DOWN = "down";
	
	/**
	 * 
	 */
	public final static String PROPERTY_KEY_STARTUP = "last_startup";
	
	/**
	 * 
	 */
	public final static String PROPERTY_KEY_SHUTDOWN = "last_shutdown";
	
	/**
	 * 
	 */
	protected Properties prop = new Properties();
	
	/**
	 * 
	 * @param service
	 */
	public RuntimeGuardService() {
		super(TestServerServiceEnum.RUNTIME_GUARD_SERVICE);
		getLaunchEventSet().add(EventType.ON_TEST_SERVER_START);
		getLaunchEventSet().add(EventType.ON_TEST_SERVER_STOP);
		
		Properties prop = new Properties();
   		try {
			prop.load(new FileInputStream(GUARD_FILE));
		} catch (FileNotFoundException e) {
			log("I/O Error: Guard file '" + GUARD_FILE + "' not found! Creating new guard file...", 0);
			try {
				savePropertyFile(true);
			} catch (IOException e1) {
				log("I/O Error: Guard file '" + GUARD_FILE + "' could not be created!", 0);
			}
		} catch (IOException e) {
			log("I/O Error: Cannot open guard file!", 0);
		}	   	
	}

	/*
	 * (non-Javadoc)
	 * @see at.alladin.rmbt.qos.testserver.service.AbstractJob#execute()
	 */
	@Override
	public String execute() throws Exception {
		if (prop != null) {
			switch(getLastEventType()) {
			case ON_TEST_SERVER_START:
				String status = prop.getProperty(PROPERTY_KEY_STATUS, PROPERTY_VALUE_STATUS_DOWN);
				if (!status.equals(PROPERTY_VALUE_STATUS_DOWN)) {
					log("Test server shutdown not executed correctly!", 0);
				}
				else  {
					prop.setProperty(PROPERTY_KEY_STATUS, PROPERTY_VALUE_STATUS_UP);
					prop.setProperty(PROPERTY_KEY_STARTUP, (new Date()).toString());
				}
				savePropertyFile();
				return null;
			case ON_TEST_SERVER_STOP:
				String startUp = prop.getProperty(PROPERTY_KEY_STARTUP);
				log("Test server was up since: " + startUp, 0);
				prop.setProperty(PROPERTY_KEY_STATUS, PROPERTY_VALUE_STATUS_DOWN);
				prop.setProperty(PROPERTY_KEY_SHUTDOWN, (new Date()).toString());
				savePropertyFile();
				return null;
			default:
				break;
			}
		}
		
		return "Execution error!";
	}

	/**
	 * 
	 * @throws IOException
	 */
	private void savePropertyFile() throws IOException {
		savePropertyFile(false);
	}

	/**
	 * 
	 * @param isNew
	 * @throws IOException
	 */
	private void savePropertyFile(boolean isNew) throws IOException {
		if (isNew) {
			prop.setProperty(PROPERTY_KEY_STATUS, PROPERTY_VALUE_STATUS_DOWN);
			prop.setProperty(PROPERTY_KEY_STARTUP, (new Date()).toString());
		}
		prop.store(new FileOutputStream(GUARD_FILE), "Automatically generated guard file.\nPlease do not change manually!");
	}

	/*
	 * (non-Javadoc)
	 * @see at.alladin.rmbt.qos.testserver.service.AbstractJob#getNewInstance()
	 */
	@Override
	public RuntimeGuardService getNewInstance() {
		return new RuntimeGuardService();
	}

	/*
	 * (non-Javadoc)
	 * @see at.alladin.rmbt.qos.testserver.service.AbstractJob#getId()
	 */
	@Override
	public String getId() {
		return TAG;
	}
}