/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.InputStream;

import java.io.OutputStream;

import java.io.PrintStream;

import java.net.Socket;

import java.util.HashMap;

import java.util.Map;

import java.util.function.Consumer;

import jdk.jshell.execution.DirectExecutionControl;

import jdk.jshell.spi.ExecutionControl;

import jdk.jshell.spi.ExecutionControl.EngineTerminationException;

import jdk.jshell.spi.ExecutionControl.InternalException;

import jdk.jshell.spi.ExecutionControl.RunException;

import static jdk.jshell.execution.Util.forwardExecutionControlAndIO;

/**

 * A custom remote agent to verify aux channel and custom ExecutionControl.

 */

public class MyRemoteExecutionControl extends DirectExecutionControl implements ExecutionControl {

    static PrintStream auxPrint;

    /**

     * Launch the agent, connecting to the JShell-core over the socket specified

     * in the command-line argument.

     *

     * @param args standard command-line arguments, expectation is the socket

     * number is the only argument

     * @throws Exception any unexpected exception

     */

    public static void main(String[] args) throws Exception {

        try {

            String loopBack = null;

            Socket socket = new Socket(loopBack, Integer.parseInt(args[0]));

            InputStream inStream = socket.getInputStream();

            OutputStream outStream = socket.getOutputStream();

            Map<String, Consumer<OutputStream>> outputs = new HashMap<>();

            outputs.put("out", st -> System.setOut(new PrintStream(st, true)));

            outputs.put("err", st -> System.setErr(new PrintStream(st, true)));

            outputs.put("aux", st -> { auxPrint = new PrintStream(st, true); });

            Map<String, Consumer<InputStream>> input = new HashMap<>();

            input.put("in", st -> System.setIn(st));

            forwardExecutionControlAndIO(new MyRemoteExecutionControl(), inStream, outStream, outputs, input);

        } catch (Throwable ex) {

            throw ex;

        }

    }

    @Override

    public String varValue(String className, String varName)

            throws RunException, EngineTerminationException, InternalException {

        auxPrint.print(varName);

        return super.varValue(className, varName);

    }

    @Override

    public Object extensionCommand(String className, Object arg)

            throws RunException, EngineTerminationException, InternalException {

        if (!arg.equals("test")) {

            throw new InternalException("expected extensionCommand arg to be 'test' got: " + arg);

        }

        return "ribbit";

    }

}