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/**
 * Copyright (c) 2008 Pyxis Technologies inc.
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA,
 * or see the FSF site: http://www.fsf.org.
 *
 * @author oaouattara
 * @version $Id: $Id
 */
package com.greenpepper.agent.server;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.greenpepper.util.StringUtil;
public class AgentConfiguration
{

	private final static int DEFAULT_PORT = 56000;

	private final static String DEFAULT_CONFIG_FILE = "remoteagent.properties";

	private final static String AGENT_KEY_NAME = "greenpepper.remoteagent.";
	private final static String PORT_PROPERTY_NAME = AGENT_KEY_NAME + "port";
	private final static String SECURED_PROPERTY_NAME = AGENT_KEY_NAME + "secured";
	private final static String KEYSTORE_PROPERTY_NAME = AGENT_KEY_NAME + "keystore.file";
	private final static String KEYSTORE_PASSWORD_PROPERTY_NAME = AGENT_KEY_NAME + "keystore.password";

	private final Logger log = LoggerFactory.getLogger(AgentConfiguration.class);

	private final int port;
	private final boolean secured;
	private final String keyStore;
	private final String keyStorePassword;

	/**
	 * Constructor for AgentConfiguration.
	 *
	 * @param args a {@link java.lang.String} object.
	 * @throws java.io.IOException if any.
	 */
	public AgentConfiguration(String... args)
			throws IOException
	{
		ComandLineHelper commandLineHelper = new ComandLineHelper(args);

		Properties properties = loadProperties(commandLineHelper.getConfig());

		this.port = getPort(properties, commandLineHelper.getPort(DEFAULT_PORT));
		this.secured = isSecured(properties, commandLineHelper.isSecured());
		this.keyStore = getKeyStore(properties, commandLineHelper.getKeyStore());
		this.keyStorePassword = getKeyStorePassword(properties);
	}

	/**
	 * Getter for the field port.
	 *
	 * @return a int.
	 */
	public int getPort()
	{
		return port;
	}

	/**
	 * isSecured.
	 *
	 * @return a boolean.
	 */
	public boolean isSecured()
	{
		return secured;
	}

	/**
	 * Getter for the field keyStore.
	 *
	 * @return a {@link java.lang.String} object.
	 * @throws java.io.IOException if any.
	 */
	public String getKeyStore()
			throws IOException
	{
		if (!isSecured())
		{
			return null;
		}
		
		if (keyStore == null)
		{
			throw new IllegalArgumentException("You must specify keystore file location");
		}

		final File keyStoreFile = new File(keyStore);

		if (!keyStoreFile.exists())
		{
			throw new FileNotFoundException(String.format("KeyStore file '%s' does not exists",
														  keyStoreFile.getAbsolutePath()));
		}

		return keyStore;
	}

	/**
	 * Getter for the field keyStorePassword.
	 *
	 * @return a {@link java.lang.String} object.
	 */
	public String getKeyStorePassword()
	{
		if (!isSecured())
		{
			return null;
		}

		return keyStorePassword;
	}

	private Properties loadProperties(String config)
			throws IOException
	{
		Properties properties = new Properties();

		if (config == null)
		{
			File configFile = new File(DEFAULT_CONFIG_FILE).getAbsoluteFile();
			if (configFile.exists())
			{
				loadProperties(properties, configFile);
			}
			else
			{
				log.info("Default configuration file not found.  Skip.");
			}
		}
		else
		{
			File configFile = new File(config);

			if (!configFile.exists())
			{
				throw new FileNotFoundException(String.format("Configuration file '%s' does not exist",
															  configFile.getAbsolutePath()));
			}

			loadProperties(properties, configFile);
		}

		return properties;
	}

	private void loadProperties(Properties properties, File filename)
			throws IOException
	{
		log.info(String.format("Reading configuration file '%s'...", filename.getAbsolutePath()));

		FileInputStream fis = new FileInputStream(filename);
		properties.load(fis);
		fis.close();
	}

	private int getPort(Properties properties, int defaultValue)
	{
		return Integer.parseInt(properties.getProperty(PORT_PROPERTY_NAME, String.valueOf(defaultValue)));
	}

	private boolean isSecured(Properties properties, boolean defaultValue)
	{
		return Boolean.parseBoolean(properties.getProperty(SECURED_PROPERTY_NAME, String.valueOf(defaultValue)));
	}

	private String getKeyStore(Properties properties, String defaultValue)
	{
		return StringUtil.toNullIfEmpty(properties.getProperty(KEYSTORE_PROPERTY_NAME, defaultValue));
	}

	private String getKeyStorePassword(Properties properties)
	{
		return StringUtil.toNullIfEmpty(properties.getProperty(KEYSTORE_PASSWORD_PROPERTY_NAME, null));
	}
}