package alice.datasegment;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.SocketAddress;
import java.net.StandardProtocolFamily;
import java.net.StandardSocketOptions;
import java.nio.channels.DatagramChannel;

import org.apache.log4j.Logger;

import alice.daemon.IncomingUdpConnection;
import alice.daemon.MulticastConnection;
import alice.daemon.OutboundTcpConnection;

public class MulticastDataSegmentManager extends RemoteDataSegmentManager {
	
	public MulticastDataSegmentManager(String connectionKey ,final String MCASTADDR, final int port, final String nis) {
		logger = Logger.getLogger(connectionKey);
		InetAddress mAddr;
		try {
			mAddr = InetAddress.getByName(MCASTADDR);

			DatagramChannel dcr =  createDatagramChannel(mAddr, port, nis);
			dcr.bind(new InetSocketAddress(port));
			SocketAddress sAddrr = new InetSocketAddress(mAddr,port);
			MulticastConnection receiver = new MulticastConnection(dcr, sAddrr);
			
			DatagramChannel dcs =  createDatagramChannel(mAddr, port, nis);
			SocketAddress sAddrs = new InetSocketAddress(mAddr,port);
			connection = new MulticastConnection(dcs, sAddrs); // sender 

			new IncomingUdpConnection((MulticastConnection) connection, receiver, this).start();
			new OutboundTcpConnection(connection).start(); // OutboundUdpConnection sender
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
	
	private DatagramChannel createDatagramChannel(InetAddress group, int port, String nis) {
		DatagramChannel dc = null;
		NetworkInterface ni;
		try {
			ni = NetworkInterface.getByName(nis);
			if (ni==null) {
				System.err.println("Can't open network interface "+nis);
				throw new IOException();
			}
			if (!ni.supportsMulticast()) {
				System.err.println("Network interface does not support multicast"+nis);
				throw new IOException();
			}
			
			dc = DatagramChannel.open(StandardProtocolFamily.INET);
			dc.setOption(StandardSocketOptions.SO_REUSEADDR, true);
			dc.setOption(StandardSocketOptions.IP_MULTICAST_IF, ni);
			dc.join(group, ni);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return dc;
	}	
}