import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.util.ArrayList;

class ChatBackImpl implements ChatBack {    
    
    public void send(String src, String msg) throws RemoteException { /* TODO */ }
							  
}


public class ChatClient {
    
    public static void main(String args[]) { 
	
	if (args.length != 2) {
	    System.out.println("Usage: ChatClient host nickname");
	    System.exit(1);
	}
	
	try { 
            Registry registry = LocateRegistry.getRegistry(args[0]);
            Chat chat = (Chat) registry.lookup("chat");
	    ChatBack chatback = new ChatBackImpl();
	    ChatBack stub = (ChatBack) UnicastRemoteObject.exportObject(chatback, 0);
	    
	    // sample
	    chat.connect(args[1], stub);
	    ArrayList<String> users = chat.list();
	    System.out.println("users: " + users);
	    chat.send(args[1],"hello world!");
	    chat.disconnect(args[1]);

	} catch (Exception e) { 
	    System.out.println("ChatClient exception: " + e.getMessage()); 
	    e.printStackTrace(); 
	} 
	
    } 
}