/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.example.http.websocketx.client;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.codec.http.DefaultHttpHeaders;
  import io.netty.handler.codec.http.HttpClientCodec;
  import io.netty.handler.codec.http.HttpObjectAggregator;
  import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
  import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
  import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
  import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
  import io.netty.handler.codec.http.websocketx.WebSocketFrame;
  import io.netty.handler.codec.http.websocketx.WebSocketVersion;
  import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
  
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.net.URI;
  
  /**
   * This is an example of a WebSocket client.
   * <p>
   * In order to run this example you need a compatible WebSocket server.
   * Therefore you can either start the WebSocket server from the examples
   * by running {@link io.netty.example.http.websocketx.server.WebSocketServer}
   * or connect to an existing WebSocket server such as
   * <a href="https://www.websocket.org/echo.html">ws://echo.websocket.org</a>.
   * <p>
   * The client will attempt to connect to the URI passed to it as the first argument.
   * You don't have to specify any arguments if you want to connect to the example WebSocket server,
   * as this is the default.
   */
  public final class WebSocketClient {
  
      static final String URL = System.getProperty("url", "ws://127.0.0.1:8080/websocket");
  
      public static void main(String[] args) throws Exception {
          URI uri = new URI(URL);
          String scheme = uri.getScheme() == null? "ws" : uri.getScheme();
          final String host = uri.getHost() == null? "127.0.0.1" : uri.getHost();
          final int port;
          if (uri.getPort() == -1) {
              if ("ws".equalsIgnoreCase(scheme)) {
                  port = 80;
              } else if ("wss".equalsIgnoreCase(scheme)) {
                  port = 443;
              } else {
                  port = -1;
              }
          } else {
              port = uri.getPort();
          }
  
          if (!"ws".equalsIgnoreCase(scheme) && !"wss".equalsIgnoreCase(scheme)) {
              System.err.println("Only WS(S) is supported.");
              return;
          }
  
          final boolean ssl = "wss".equalsIgnoreCase(scheme);
          final SslContext sslCtx;
          if (ssl) {
              sslCtx = SslContextBuilder.forClient()
                  .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
          } else {
              sslCtx = null;
          }
  
          EventLoopGroup group = new NioEventLoopGroup();
          try {
              // Connect with V13 (RFC 6455 aka HyBi-17). You can change it to V08 or V00.
              // If you change it to V00, ping is not supported and remember to change
              // HttpResponseDecoder to WebSocketHttpResponseDecoder in the pipeline.
              final WebSocketClientHandler handler =
                      new WebSocketClientHandler(
                             WebSocketClientHandshakerFactory.newHandshaker(
                                     uri, WebSocketVersion.V13, null, true, new DefaultHttpHeaders()));
 
             Bootstrap b = new Bootstrap();
             b.group(group)
              .channel(NioSocketChannel.class)
              .handler(new ChannelInitializer<SocketChannel>() {
                  @Override
                  protected void initChannel(SocketChannel ch) {
                      ChannelPipeline p = ch.pipeline();
                      if (sslCtx != null) {
                          p.addLast(sslCtx.newHandler(ch.alloc(), host, port));
                      }
                      p.addLast(
                              new HttpClientCodec(),
                              new HttpObjectAggregator(8192),
                              WebSocketClientCompressionHandler.INSTANCE,
                              handler);
                  }
              });
 
             Channel ch = b.connect(uri.getHost(), port).sync().channel();
             handler.handshakeFuture().sync();
 
             BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
             while (true) {
                 String msg = console.readLine();
                 if (msg == null) {
                     break;
                 } else if ("bye".equals(msg.toLowerCase())) {
                     ch.writeAndFlush(new CloseWebSocketFrame());
                     ch.closeFuture().sync();
                     break;
                 } else if ("ping".equals(msg.toLowerCase())) {
                     WebSocketFrame frame = new PingWebSocketFrame(Unpooled.wrappedBuffer(new byte[] { 8, 1, 8, 1 }));
                     ch.writeAndFlush(frame);
                 } else {
                     WebSocketFrame frame = new TextWebSocketFrame(msg);
                     ch.writeAndFlush(frame);
                 }
             }
         } finally {
             group.shutdownGracefully();
         }
     }
 }