package de.bwlehrpool.bwlp_guac;

import org.apache.guacamole.GuacamoleException;
import org.apache.guacamole.net.event.TunnelCloseEvent;
import org.apache.guacamole.net.event.TunnelConnectEvent;
import org.apache.guacamole.net.event.listener.Listener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashSet;

/**
 * A listener to track whether a user currently is connected to a tunnel.
 */
public class TunnelListener implements Listener {

    private static final Logger LOGGER = LoggerFactory.getLogger(TunnelListener.class);

    private static final HashSet<String> usersWithTunnel = new HashSet<String>();

    public static boolean hasTunnel(String username) {
        return usersWithTunnel.contains(username);
    }

    @Override
    public void handleEvent(Object event) throws GuacamoleException {
        if (event instanceof TunnelConnectEvent) {
            String username = ((TunnelConnectEvent)event).getCredentials().getUsername();
            LOGGER.info("User " + username + " connected to a tunnel.");
            usersWithTunnel.add(username);
        }
        else if (event instanceof TunnelCloseEvent) {
            String username = ((TunnelCloseEvent)event).getCredentials().getUsername();
            LOGGER.info("User " + username + " closed a tunnel.");
            usersWithTunnel.remove(username);
        }

    }

}