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/*
 * Copyright (c) 2008, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.glassfish.grizzly.samples.echo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.filterchain.FilterChainBuilder;
import org.glassfish.grizzly.filterchain.TransportFilter;
import org.glassfish.grizzly.nio.transport.TCPNIOTransport;
import org.glassfish.grizzly.nio.transport.TCPNIOTransportBuilder;
import org.glassfish.grizzly.utils.Charsets;
import org.glassfish.grizzly.utils.StringFilter;

/**
 * The simple client, which sends a message to the echo server and waits for response
 * 
 * @author Alexey Stashok
 */
public class EchoClient {

    @SuppressWarnings("unchecked")
    public static void main(String[] args) throws IOException, ExecutionException, InterruptedException, TimeoutException {

        Connection connection = null;

        // Create a FilterChain using FilterChainBuilder
        FilterChainBuilder filterChainBuilder = FilterChainBuilder.stateless();
        // Add TransportFilter, which is responsible
        // for reading and writing data to the connection
        filterChainBuilder.add(new TransportFilter());
        // StringFilter is responsible for Buffer <-> String conversion
        filterChainBuilder.add(new StringFilter(Charset.forName("UTF-8")));
        // ClientFilter is responsible for redirecting server responses to the standard output
        filterChainBuilder.add(new ClientFilter());

        // Create TCP transport
        final TCPNIOTransport transport = TCPNIOTransportBuilder.newInstance().build();
        transport.setProcessor(filterChainBuilder.build());

        try {
            // start the transport
            transport.start();

            // perform async. connect to the server
            Future future = transport.connect(EchoServer.HOST, EchoServer.PORT);
            // wait for connect operation to complete
            connection = future.get(10, TimeUnit.SECONDS);

            assert connection != null;

            System.out.println("Ready... (\"q\" to exit)");
            final BufferedReader inReader = new BufferedReader(new InputStreamReader(System.in, Charsets.ASCII_CHARSET));
            do {
                final String userInput = inReader.readLine();
                if (userInput == null || "q".equals(userInput)) {
                    break;
                }

                connection.write(userInput);
            } while (true);
        } finally {
            // close the client connection
            if (connection != null) {
                connection.closeSilently();
            }

            // stop the transport
            transport.shutdownNow();
        }
    }
}