import java.rmi.Naming;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.util.HashMap;
import java.util.Map;


public class ChatRegistryImpl implements ChatRegistryInterface
{
    private Map<String,Remote> db;

    public ChatRegistryImpl()
    {
        db = new HashMap<String,Remote>();
    }

    @Override
    public Remote connectRoom(String roomName, Remote clientListener) throws RemoteException
    {
        try
        {
            RoomServer rs = (RoomServer) db.get(roomName);

            if( rs.addClient(clientListener) )
                return (Remote)rs;
            else
                return null;
        }
        catch( ClassCastException | NullPointerException e)
        {
            return null;
        }
    }

    @Override
    public Remote createRoom(String roomName, Remote clientListener) throws RemoteException
    {
        try
        {
            RoomServer roomServerRemote = new RoomServer();

            if( roomServerRemote.addClient(clientListener) )
            {
                db.put(roomName, roomServerRemote);
                return roomServerRemote;
            }
            else
                return null;

        }
        catch( ClassCastException | NullPointerException e)
        {
            return null;
        }
    }

    @Override
    public String showRooms() throws RemoteException
    {
        // TODO migliorare
        return db.keySet().toString();
    }

    public static void main( String args[] )
    {
        final int REGISTRYPORT = 1099;
        String registryHost = "localhost";
        String serviceName = "ChatRegistry";

        try
        {
            String completeName = "//"+ registryHost + ":" + REGISTRYPORT + "/" + serviceName;
            ChatRegistryImpl serverRMI = new ChatRegistryImpl();
            Naming.rebind(completeName, serverRMI);
        }
        catch (Exception e)
        {
            e.printStackTrace();
            //TODO
        }

    }



}