package org.openslx.thrifthelper;

import java.lang.reflect.Proxy;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.log4j.Logger;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.openslx.imagemaster.thrift.iface.ImageServer;
import org.openslx.sat.thrift.iface.Server;
import org.openslx.thrifthelper.ThriftHandler.ClientCreationCallback;

public class ThriftManager {

	private final static Logger LOGGER = Logger.getLogger(ThriftManager.class);
	
	/** 
	 * Public variables to represent client types
	 * TODO: Public needed?
	 */
	public static enum ClientType {
		MASTER, SATELLITE
	}
	/**
	 * Private singleton instances of itself and the satellite/master clients
	 */
	private static Server.Iface _satClient = (Server.Iface) Proxy.newProxyInstance(
			Server.Iface.class.getClassLoader(),
			new Class[] { Server.Iface.class }, new ThriftHandler<Server.Client>(Server.Client.class, new ClientCreationCallback<Server.Client>() {

				@Override
				public Server.Client get() {
					// first check if we have a sat ip
					if (SATELLITE_IP == null) {
						LOGGER.error("Satellite ip adress was not set prior to getting the sat client. Use setSatellite(<ip>).");
						return null;
					}
					// ok lets do it
					TTransport transport = 
							new TSocket(SATELLITE_IP, SATELLITE_PORT, SATELLITE_TIMEOUT);
					try {
						transport.open();
					} catch (TTransportException e) {
						LOGGER.error("Could not open transport to thrift's server with IP: " + SATELLITE_IP);
						return null;
					}
					final TProtocol protocol = new TBinaryProtocol(transport);
					// now we are ready to create the client, according to ClientType!
					LOGGER.info("Satellite '" + SATELLITE_IP + "' reachable. Client initialised.");
					return new Server.Client(protocol);
				}
			}));

	private static ImageServer.Iface _masterClient = (ImageServer.Iface) Proxy.newProxyInstance(
			ImageServer.Iface.class.getClassLoader(),
			new Class[] { ImageServer.Iface.class }, new ThriftHandler<ImageServer.Client>(ImageServer.Client.class, new ClientCreationCallback<ImageServer.Client>() {

				@Override
				public ImageServer.Client get() {
					// ok lets do it
					TTransport transport = 
							new TFramedTransport(new TSocket(MASTERSERVER_IP, MASTERSERVER_PORT, MASTERSERVER_TIMEOUT));
					try {
						transport.open();
					} catch (TTransportException e) {
						LOGGER.error("Could not open transport to thrift's server with IP: " + MASTERSERVER_IP);
						return null;
					}
					final TProtocol protocol = new TBinaryProtocol(transport);
					// now we are ready to create the client, according to ClientType!
					return new ImageServer.Client(protocol);

				}
			}));
	/**
	 * Private members for master connection information
	 */
	private static final String MASTERSERVER_IP = "132.230.4.16";
	private static final int 		MASTERSERVER_PORT = 9090;
	private static final int 		MASTERSERVER_TIMEOUT = 30000;
	
	
	/**
	 * Private members for satellite connection information
	 */
	private static String 			SATELLITE_IP = null;
	private static final int 		SATELLITE_PORT = 9090;
	private static final int 		SATELLITE_TIMEOUT = 10000;
	
	/**
	 * IP Validation Regex
	 */
  private static final String IP_VALID_PATTERN =
	"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
	"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
	"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
	"([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";

	/**
	 * Sets the IP of the satellite to connect to
	 * @param ip the ip of the satellite as String
	 * @return true if setting the ip worked, false otherwise
	 */
	public static boolean setSatellite(String ip) {
		if (ip.isEmpty()) {
			LOGGER.error("Given IP for satellite is empty.");
			return false;
		}
		// validate
		Matcher matcher = Pattern.compile(IP_VALID_PATTERN).matcher(ip);
		if (!matcher.matches()) {
			LOGGER.error("Given form of IP is invalid: " + ip);
			return false;
		}
		// finally set it
		SATELLITE_IP = ip;

		// last check: try to connect
		if (getSatClient() == null) {
			// init failed
			LOGGER.error("Could not initialise new client to satellite: " + SATELLITE_IP);
			return false;
		}
		// TODO final last: get version from server
		return true;
	}
	/** 
	 * Returns the singleton client of the thrift connection to the satellite
	 * @return the thrift client to the satellite server
	 */
	public static Server.Iface getSatClient() {
			return _satClient;
	}
	
	/**
	 * Returns the singleton client of the master thrift connection
	 * @return the thrift client to the master server
	 */
	public static ImageServer.Iface getMasterClient() {
		return _masterClient;
	}
}