/*
 * Copyright (c) 2018. Developed by Hedgecode.
 *
 * Licensed 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.hedgecode.chess.uci;

import java.io.InputStream;
import java.io.OutputStream;

import org.hedgecode.chess.uci.annotation.CommandDirection;
import org.hedgecode.chess.uci.command.CommandParams;

/**
 *
 *
 * @author Dmitry Samoshin aka gotty
 */
public final class ConsoleAcceptorRunner implements AcceptorRunner {

    private ConsoleAcceptor acceptor;

    private boolean isRunning;

    ConsoleAcceptorRunner() {
        acceptor = new ConsoleAcceptor(
                System.in, System.out
        );
        isRunning = false;
    }

    ConsoleAcceptorRunner(InputStream input, OutputStream output) {
        acceptor = new ConsoleAcceptor(
                input, output
        );
        isRunning = false;
    }

    @Override
    public Acceptor init() throws AcceptorException {
        if (isRunning)
            throw new AcceptorException("uci.acceptor.already.run");
        return acceptor;
    }

    public void run(final CommandExecutor commandExecutor) throws AcceptorException {
        if (isRunning)
            throw new AcceptorException("uci.acceptor.already.run");

        Thread engineThread = new Thread(
                new Runnable() {
                    public void run() {
                        Transmitter<String> acceptorTransmitter = acceptor.transmitter();
                        try {
                            while (acceptorTransmitter.isActive()) {
                                if (acceptorTransmitter.hasCommand()) {
                                    String command = acceptorTransmitter.transmitCommand();
                                    if (command.isEmpty()) continue;
                                    CommandParams commandParams = new CommandParams(command);
                                    commandExecutor.exec(
                                            commandParams.getName(),
                                            CommandDirection.TO_ENGINE,
                                            commandParams.getParams()
                                    );
                                    if (UCIConstants.QUIT.equals(commandParams.getName()))
                                        acceptorTransmitter.stop();
                                }
                            }
                        } finally {
                            acceptorTransmitter.close();
                            isRunning = false;
                        }
                    }
                }
        );
        engineThread.start();
        isRunning = true;
    }

}