/*
 * Copyright (C) 2012 Red Hat, Inc. and/or its affiliates.
 *
 * 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.jboss.errai.bus.server.io.websockets;

import static org.slf4j.LoggerFactory.getLogger;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.ssl.SslHandler;

import org.jboss.errai.bus.server.io.websockets.ssl.SslHandlerFactory;
import org.jboss.errai.bus.server.service.ErraiConfigAttribs;
import org.jboss.errai.bus.server.service.ErraiService;
import org.jboss.errai.bus.server.service.ErraiServiceConfigurator;
import org.slf4j.Logger;

/**
 * @author Mike Brock
 * @author Christian Sadilek <csadilek@redhat.com>
 */
public class WebSocketServer {
  private ErraiService svc;
  private Logger log = getLogger(getClass());
  private boolean useSecureWebSocket = false;

  public WebSocketServer(ErraiService svc) {
    this.svc = svc;
  }

  public void start() {
    final ErraiServiceConfigurator esc = svc.getConfiguration();
    useSecureWebSocket = ErraiConfigAttribs.SECURE_WEB_SOCKET_SERVER.getBoolean(esc);
    final int port = ErraiConfigAttribs.WEB_SOCKET_PORT.getInt(esc);
    final ServerBootstrap bootstrap = new ServerBootstrap();
    final WebSocketServerHandler webSocketHandler = new WebSocketServerHandler(svc);

    try {
      final NioEventLoopGroup bossGroup = new NioEventLoopGroup();
      final NioEventLoopGroup workerGroup = new NioEventLoopGroup();
      final ChannelFuture channelFuture = bootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
              .childHandler(new ChannelInitializer() {
                @Override
                protected void initChannel(Channel ch) throws Exception {
                  if (useSecureWebSocket) {
                    final SslHandler sslHandler = SslHandlerFactory.buildSslHandler(esc);
                    ch.pipeline().addLast("ssl", sslHandler);
                  }
                  ch.pipeline().addLast("codec-http", new HttpServerCodec());
                  ch.pipeline().addLast("aggregator", new HttpObjectAggregator(65536));
                  ch.pipeline().addLast("handler", webSocketHandler);
                }

              }).bind(port).sync();

      svc.addShutdownHook(new Runnable() {
        @Override
        public void run() {
          try {
            webSocketHandler.stop();
            channelFuture.channel().close();
            log.info("web socket server stopped.");
          } 
          catch (Exception e) {
            throw new RuntimeException(e);
          } 
          finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
          }
        }
      });

    } 
    catch (Throwable t) {
      throw new RuntimeException(t);
    }
    log.info("started web socket server on port: " + port);
  }
}