package de.bwlehrpool.bwlp_guac;

import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;

import org.apache.guacamole.GuacamoleException;
import org.apache.guacamole.net.auth.AuthenticatedUser;
import org.apache.guacamole.net.auth.AuthenticationProvider;
import org.apache.guacamole.net.auth.Credentials;
import org.apache.guacamole.net.auth.UserContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class BwlpAuthenticationProvider implements AuthenticationProvider {

	Logger LOGGER = LoggerFactory.getLogger(BwlpAuthenticationProvider.class);

	public String getIdentifier() {
		return "de.bwlehrpool.bwgpul";
	}

	public Object getResource() throws GuacamoleException {
		return null;
	}

	public AuthenticatedUser authenticateUser(Credentials credentials) throws GuacamoleException {
		// XXX We can somehow request additional fields to be shown during login by throwing an exception
		// that declares additional ones; but when I tried, it removed the existing username and password
		// field, so do we need to state them too? Seems wrong since we don't need them, we'd just want
		// an additional field to pick the room/location we want to end up in and let the actual
		// authentication plugin define the username/password fields.
		return null;
	}

	public AuthenticatedUser updateAuthenticatedUser(AuthenticatedUser authenticatedUser, Credentials credentials)
			throws GuacamoleException {
		return null;
	}

	public UserContext getUserContext(AuthenticatedUser authenticatedUser) throws GuacamoleException {
		LOGGER.warn("Ignoring getUserContext for " + authenticatedUser.toString());
		return null;
	}

	public UserContext updateUserContext(UserContext context, AuthenticatedUser authenticatedUser,
			Credentials credentials) throws GuacamoleException {
		LOGGER.warn("Ignoring updateUserContext called with " + context.toString());
		return null;
	}

	public UserContext decorate(UserContext context, AuthenticatedUser authenticatedUser, Credentials credentials)
			throws GuacamoleException {
		String username = authenticatedUser.getCredentials().getUsername();
		LOGGER.warn("decorate called for " + username);
		BwlpUserContext user = oldMappings.get(username);
		if (user != null)
			return user;
		LOGGER.warn("Doing the decoration");
		user = new BwlpUserContext(authenticatedUser, context);
		oldMappings.put(username, user);
		return user;
	}

	private Map<String, BwlpUserContext> oldMappings = Collections
			.synchronizedMap(new WeakHashMap<String, BwlpUserContext>());

	public UserContext redecorate(UserContext decorated, UserContext context, AuthenticatedUser authenticatedUser,
			Credentials credentials) throws GuacamoleException {
		String username = authenticatedUser.getCredentials().getUsername();
		LOGGER.warn("REdecorate called for " + username);
		BwlpUserContext user = oldMappings.get(username);
		if (user != null && user.hasValidConnection())
			return user;
		LOGGER.warn("Doing the REdecoration");
		user = new BwlpUserContext(authenticatedUser, context);
		oldMappings.put(username, user);
		return user;
	}

	public void shutdown() {
	}

}