/*
    * Copyright 2016 The Lannister Project
    * 
    * 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 net.anyflow.lannister.http;
  
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.http.HttpContentCompressor;
  import io.netty.handler.codec.http.HttpObjectAggregator;
  import io.netty.handler.codec.http.HttpServerCodec;
  import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import net.anyflow.lannister.Settings;
  
  class WebServerChannelInitializer extends ChannelInitializer<SocketChannel> {
  
  	private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(WebServerChannelInitializer.class);
  
  	private final boolean useSsl;
  	private final Class<? extends WebsocketFrameHandler> websocketFrameHandlerClass;
  
  	public WebServerChannelInitializer(boolean useSsl,
  			Class<? extends WebsocketFrameHandler> websocketFrameHandlerClass) {
  		this.useSsl = useSsl;
  		this.websocketFrameHandlerClass = websocketFrameHandlerClass;
  	}
  
  	@Override
  	protected void initChannel(SocketChannel ch) throws Exception {
  		if ("true".equalsIgnoreCase(Settings.INSTANCE.getProperty("webserver.logging.writelogOfNettyLogger"))) {
  			ch.pipeline().addLast("log", new LoggingHandler("lannister.web/server", LogLevel.DEBUG));
  		}
  
  		if (useSsl) {
  			SslContext sslCtx = SslContextBuilder
  					.forServer(Settings.INSTANCE.certChainFile(), Settings.INSTANCE.privateKeyFile()).build();
  
  			logger.debug("SSL Provider : {}", SslContext.defaultServerProvider());
  
  			ch.pipeline().addLast(sslCtx.newHandler(ch.alloc()));
  		}
  
  		ch.pipeline().addLast(HttpServerCodec.class.getName(), new HttpServerCodec());
  		ch.pipeline().addLast(HttpObjectAggregator.class.getName(), new HttpObjectAggregator(1048576));
  		ch.pipeline().addLast(HttpContentCompressor.class.getName(), new HttpContentCompressor());
  		ch.pipeline().addLast(HttpRequestRouter.class.getName(), new HttpRequestRouter());
  
  		if (websocketFrameHandlerClass != null) {
  			WebsocketFrameHandler wsfh = websocketFrameHandlerClass.newInstance();
  
  			ch.pipeline().addLast(WebSocketServerProtocolHandler.class.getName(), new WebSocketServerProtocolHandler(
  					wsfh.websocketPath(), wsfh.subprotocols(), wsfh.allowExtensions(), wsfh.maxFrameSize()));
  
  			ch.pipeline().addLast(wsfh);
  		}
  	}
  }