/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.hc.client5.http.impl.async;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.List;
  
  import org.apache.hc.core5.http.EntityDetails;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.message.RequestLine;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http.nio.AsyncClientExchangeHandler;
  import org.apache.hc.core5.http.nio.CapacityChannel;
  import org.apache.hc.core5.http.nio.DataStreamChannel;
  import org.apache.hc.core5.http.nio.RequestChannel;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.util.Identifiable;
  import org.slf4j.Logger;
  
  final class LoggingAsyncClientExchangeHandler implements AsyncClientExchangeHandler, Identifiable {
  
      private final Logger log;
      private final String exchangeId;
      private final AsyncClientExchangeHandler handler;
  
      LoggingAsyncClientExchangeHandler(final Logger log, final String exchangeId, final AsyncClientExchangeHandler handler) {
          this.log = log;
          this.exchangeId = exchangeId;
          this.handler = handler;
      }
  
      @Override
      public String getId() {
          return exchangeId;
      }
  
      @Override
      public void releaseResources() {
          handler.releaseResources();
      }
  
      @Override
      public void produceRequest(final RequestChannel channel, final HttpContext context) throws HttpException, IOException {
          handler.produceRequest(new RequestChannel() {
  
              @Override
              public void sendRequest(
                      final HttpRequest request,
                      final EntityDetails entityDetails,
                      final HttpContext context) throws HttpException, IOException {
                  if (log.isDebugEnabled()) {
                      log.debug("{}: send request {}, {}", exchangeId, new RequestLine(request), entityDetails != null ? "entity len " + entityDetails.getContentLength() : "null entity");
                  }
                  channel.sendRequest(request, entityDetails, context);
              }
  
          }, context);
      }
  
      @Override
      public int available() {
          return handler.available();
      }
  
      @Override
      public void produce(final DataStreamChannel channel) throws IOException {
          if (log.isDebugEnabled()) {
              log.debug("{}: produce request data", exchangeId);
          }
          handler.produce(new DataStreamChannel() {
  
             @Override
             public void requestOutput() {
                 channel.requestOutput();
             }
 
             @Override
             public int write(final ByteBuffer src) throws IOException {
                 if (log.isDebugEnabled()) {
                     log.debug("{}: produce request data, len {} bytes", exchangeId, src.remaining());
                 }
                 return channel.write(src);
             }
 
             @Override
             public void endStream() throws IOException {
                 if (log.isDebugEnabled()) {
                     log.debug("{}: end of request data", exchangeId);
                 }
                 channel.endStream();
             }
 
             @Override
             public void endStream(final List<? extends Header> trailers) throws IOException {
                 if (log.isDebugEnabled()) {
                     log.debug("{}: end of request data", exchangeId);
                 }
                 channel.endStream(trailers);
             }
 
         });
     }
 
     @Override
     public void consumeInformation(
             final HttpResponse response,
             final HttpContext context) throws HttpException, IOException {
         if (log.isDebugEnabled()) {
             log.debug("{}: information response {}", exchangeId, new StatusLine(response));
         }
         handler.consumeInformation(response, context);
     }
 
     @Override
     public void consumeResponse(
             final HttpResponse response,
             final EntityDetails entityDetails,
             final HttpContext context) throws HttpException, IOException {
         if (log.isDebugEnabled()) {
             log.debug("{}: consume response {}, {}", exchangeId, new StatusLine(response), entityDetails != null ? "entity len " + entityDetails.getContentLength() : " null entity");
         }
         handler.consumeResponse(response, entityDetails, context);
     }
 
 
     @Override
     public void updateCapacity(final CapacityChannel capacityChannel) throws IOException {
         handler.updateCapacity(new CapacityChannel() {
 
             @Override
             public void update(final int increment) throws IOException {
                 if (log.isDebugEnabled()) {
                     log.debug("{}: capacity update {}", exchangeId, increment);
                 }
                 capacityChannel.update(increment);
             }
 
         });
     }
 
     @Override
     public void consume(final ByteBuffer src) throws IOException {
         if (log.isDebugEnabled()) {
             log.debug("{}: consume response data, len {} bytes", exchangeId, src.remaining());
         }
         handler.consume(src);
     }
 
     @Override
     public void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException {
         if (log.isDebugEnabled()) {
             log.debug("{}: end of response data", exchangeId);
         }
         handler.streamEnd(trailers);
     }
 
     @Override
     public void failed(final Exception cause) {
         if (log.isDebugEnabled()) {
             log.debug("{}: execution failed: {}", exchangeId, cause.getMessage());
         }
         handler.failed(cause);
     }
 
     @Override
     public void cancel() {
         if (log.isDebugEnabled()) {
             log.debug("{}: execution cancelled", exchangeId);
         }
         handler.cancel();
     }
 
 }