package org.openslx.imagemaster;

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

import org.apache.log4j.Logger;
import org.openslx.imagemaster.util.Util;

/**
 * Class to hold global constants and properties from 'config/global.properties'.
 */
public class Globals
{

	private static Logger LOGGER = Logger.getLogger( Globals.class );
	private static final Properties properties = new Properties();
	private static File imgPath = null;

	/* CONSTANTS */
	/**
	 * The blocksize used for crc'ing.
	 */
	public final static int blockSize = 16 * 1024 * 1024;

	/**
	 * Loads the properties from config/global.properties
	 */
	static
	{
		try {
			// Load properties
			BufferedInputStream stream = new BufferedInputStream( new FileInputStream( "config/global.properties" ) );
			properties.load( stream );
			stream.close();

			// check properties
			Util.notNullOrEmptyFatal( getImageDir(), "Image directory must be set." );
			Util.notNullOrEmptyFatal( getSslKeystoreFile(), "SSL keystore file must be set." );
			Util.notNullOrEmptyFatal( getSslKeystoreAlias(), "SSL keystore alias must be set." );
			Util.notNullOrEmptyFatal( getSslKeystorePassword(), "SSL keystore password must be set." );

			Util.notNullFatal( getSessionTimeoutUser(), "Session timeout user must be set." );
			Util.notNullFatal( getSessionTimeoutServer(), "Session timeout server must be set." );
			if ( getFiletransferPortSsl() == 0 && getFiletransferPortPlain() == 0 ) {
				LOGGER.fatal( "either SSL or plain port for file transfer must be set." );
				System.exit( 2 );
			}
			if ( getThriftPortSsl() == 0 && getThriftPortPlain() == 0 ) {
				LOGGER.fatal( "either SSL or plain port for thrift must be set." );
				System.exit( 2 );
			}

			if ( getFiletransferRetransmits() <= 0 ) {
				LOGGER.fatal( "SSL socket transmitted times must be greater than 0." );
				System.exit( 2 );
			}

			// check keystore
			if ( !getSslKeystoreFile().endsWith( ".jks" ) ) {
				LOGGER.fatal( "Keystore is not in jks format." );
				System.exit( 2 );
			}

			// remove "/" at the end of the paths
			String image = getImageDir();
			if ( image.endsWith( "/" ) ) {
				properties.put( "image_dir", image.substring( 0, image.length() - 1 ) );
			}

		} catch ( IOException e ) {
			LOGGER.fatal( "Could not load properties!" );
			LOGGER.warn( e.getStackTrace().toString() );
			System.exit( 2 );
		}
		LOGGER.info( "Loaded properties successfully" );
	}

	/* INTEGERS */

	public static int getSessionTimeoutUser()
	{
		return Util.tryToParseInt( properties.getProperty( "session.user.timeout" ) );
	}

	public static int getSessionTimeoutServer()
	{
		return Util.tryToParseInt( properties.getProperty( "session.server.timeout" ) );
	}

	public static int getFiletransferPortSsl()
	{
		return Util.tryToParseInt( properties.getProperty( "filetransfer.port.ssl" ) );
	}

	public static int getFiletransferPortPlain()
	{
		return Util.tryToParseInt( properties.getProperty( "filetransfer.port.plain" ) );
	}

	public static int getFiletransferTimeout()
	{
		return Util.tryToParseInt( properties.getProperty( "filetransfer.timeout" ) );
	}

	public static int getFiletransferRetransmits()
	{
		return Util.tryToParseInt( properties.getProperty( "filetransfer.retries" ) );
	}

	public static int getThriftPortSsl()
	{
		return Util.tryToParseInt( properties.getProperty( "thrift.port.ssl" ) );
	}

	public static int getThriftPortPlain()
	{
		return Util.tryToParseInt( properties.getProperty( "thrift.port.plain" ) );
	}

	public static long getImageValiditySeconds()
	{
		// TODO Auto-generated method stub
		return 86400l * 500;
	}

	/* STRINGS */

	public static String getImageDir()
	{
		return properties.getProperty( "storage.dir" );
	}

	public static String getSslKeystoreFile()
	{
		return properties.getProperty( "ssl.keystore.file" );
	}

	public static String getSslKeystoreAlias()
	{
		return properties.getProperty( "ssl.keystore.alias" );
	}

	public static String getSslKeystorePassword()
	{
		return properties.getProperty( "ssl.keystore.password" );
	}

	public static File getImagePath()
	{
		if ( imgPath == null ) {
			imgPath = new File( getImageDir() );
		}
		return imgPath;
	}

}