/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.guacamole.net.auth.simple;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.guacamole.GuacamoleException;
import org.apache.guacamole.environment.Environment;
import org.apache.guacamole.environment.LocalEnvironment;
import org.apache.guacamole.net.GuacamoleSocket;
import org.apache.guacamole.net.GuacamoleTunnel;
import org.apache.guacamole.net.InetGuacamoleSocket;
import org.apache.guacamole.net.SSLGuacamoleSocket;
import org.apache.guacamole.net.SimpleGuacamoleTunnel;
import org.apache.guacamole.net.auth.AbstractConnection;
import org.apache.guacamole.net.auth.ConnectionRecord;
import org.apache.guacamole.protocol.ConfiguredGuacamoleSocket;
import org.apache.guacamole.protocol.GuacamoleClientInformation;
import org.apache.guacamole.protocol.GuacamoleConfiguration;

/**
 * An extremely basic Connection implementation.
 *
 * @author Michael Jumper
 */
public class SimpleConnection extends AbstractConnection {

    /**
     * The hostname to use when connecting to guacd if no hostname is provided
     * within guacamole.properties.
     */
    private static final String DEFAULT_GUACD_HOSTNAME = "localhost";

    /**
     * The port to use when connecting to guacd if no port is provided within
     * guacamole.properties.
     */
    private static final int DEFAULT_GUACD_PORT = 4822;

    /**
     * Backing configuration, containing all sensitive information.
     */
    private GuacamoleConfiguration config;

    /**
     * Creates a completely uninitialized SimpleConnection.
     */
    public SimpleConnection() {
    }

    /**
     * Creates a new SimpleConnection having the given identifier and
     * GuacamoleConfiguration.
     *
     * @param name The name to associate with this connection.
     * @param identifier The identifier to associate with this connection.
     * @param config The configuration describing how to connect to this
     *               connection.
     */
    public SimpleConnection(String name, String identifier,
            GuacamoleConfiguration config) {
        
        // Set name
        setName(name);

        // Set identifier
        setIdentifier(identifier);

        // Set config
        setConfiguration(config);
        this.config = config;

    }

    @Override
    public int getActiveConnections() {
        return 0;
    }

    @Override
    public Map<String, String> getAttributes() {
        return Collections.<String, String>emptyMap();
    }

    @Override
    public void setAttributes(Map<String, String> attributes) {
        // Do nothing - there are no attributes
    }

    @Override
    public GuacamoleTunnel connect(GuacamoleClientInformation info)
            throws GuacamoleException {

        Environment env = new LocalEnvironment();
        
        // Get guacd connection parameters
        String hostname = env.getProperty(Environment.GUACD_HOSTNAME, DEFAULT_GUACD_HOSTNAME);
        int port = env.getProperty(Environment.GUACD_PORT, DEFAULT_GUACD_PORT);

        GuacamoleSocket socket;
        
        // If guacd requires SSL, use it
        if (env.getProperty(Environment.GUACD_SSL, false))
            socket = new ConfiguredGuacamoleSocket(
                new SSLGuacamoleSocket(hostname, port),
                config, info
            );

        // Otherwise, just connect directly via TCP
        else
            socket = new ConfiguredGuacamoleSocket(
                new InetGuacamoleSocket(hostname, port),
                config, info
            );

        return new SimpleGuacamoleTunnel(socket);
        
    }

    @Override
    public List<ConnectionRecord> getHistory() throws GuacamoleException {
        return Collections.<ConnectionRecord>emptyList();
    }

}