/*******************************************************************************
    * Copyright (c) 2011 Michael Mimo Moratti.
    *
    * Michael Mimo Moratti 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:
    *     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 ch.mimo.netty.example.icap.simple;
  
  import java.nio.charset.Charset;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.channel.ChannelHandlerContext;
  import org.jboss.netty.channel.MessageEvent;
  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
  import org.jboss.netty.handler.codec.http.HttpHeaders;
  
  import ch.mimo.netty.handler.codec.icap.DefaultIcapResponse;
  import ch.mimo.netty.handler.codec.icap.IcapHeaders;
  import ch.mimo.netty.handler.codec.icap.IcapMessageElementEnum;
  import ch.mimo.netty.handler.codec.icap.IcapRequest;
  import ch.mimo.netty.handler.codec.icap.IcapResponse;
  import ch.mimo.netty.handler.codec.icap.IcapResponseStatus;
  import ch.mimo.netty.handler.codec.icap.IcapVersion;
  
  public class IcapServerHandler extends SimpleChannelUpstreamHandler {
  
  	@Override
  	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
  		IcapRequest request = (IcapRequest)e.getMessage();
  		
  		System.out.println(request.toString());
  		
  		IcapResponse response = new DefaultIcapResponse(IcapVersion.ICAP_1_0,IcapResponseStatus.OK);
  		IcapMessageElementEnum bodyType = request.getBody();
  		
  		if(request.getHttpRequest() != null) {
  			request.getHttpRequest().addHeader(HttpHeaders.Names.VIA,"icap://my.icap.server");
  			response.setHttpRequest(request.getHttpRequest());
  		}
  		if(request.getHttpResponse() != null) {
  			request.getHttpResponse().addHeader(HttpHeaders.Names.VIA,"icap://my.icap.server");
  			response.setHttpResponse(request.getHttpResponse());
  		}
  		response.addHeader(IcapHeaders.Names.ISTAG,"SimpleServer-version-1.0");
  		
  		ChannelBuffer buffer = null;
  		switch (bodyType) {
  		case NULLBODY:
  			// No body in request
  			break;
  		case REQBODY:
  			// http request body in request
  			buffer = request.getHttpRequest().getContent();
  			break;
  		case RESBODY:
  			// http response body in request
  			buffer = request.getHttpResponse().getContent();
  			break;
  		default:
  			// cannot reach here.
  			break;
  		}
  		
  		/*
  		 * There is also a convenience method that extracts a body from any http message.
  		 * @See IcapChunkAggregator#extractHttpBodyContentFromIcapMessage(IcapMessage message).
  		 */
  		
  		if(buffer != null) {
  			System.out.println(buffer.toString(Charset.defaultCharset()));
  		}
  		
  		ctx.getChannel().write(response);
  	}
  
  }