/*
    * This file is part of Waarp Project (named also Waarp or GG).
    *
    *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
    *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
    * individual contributors.
    *
    *  All Waarp Project is free software: you can redistribute it and/or
    * modify it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or (at your
   * option) any later version.
   *
   * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY
   * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along with
   * Waarp . If not, see <http://www.gnu.org/licenses/>.
   */
  
  /*
   * Copyright 2009 Red Hat, Inc.
   *
   * Red Hat 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 org.waarp.gateway.kernel.rest.client;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.handler.codec.http.HttpContent;
  import io.netty.handler.codec.http.HttpHeaderNames;
  import io.netty.handler.codec.http.HttpObject;
  import io.netty.handler.codec.http.HttpResponse;
  import io.netty.handler.codec.http.HttpResponseStatus;
  import io.netty.handler.codec.http.LastHttpContent;
  import io.netty.util.AttributeKey;
  import org.waarp.common.crypto.ssl.WaarpSslUtility;
  import org.waarp.common.json.JsonHandler;
  import org.waarp.common.logging.WaarpLogger;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.common.utility.WaarpStringUtils;
  import org.waarp.gateway.kernel.exception.HttpIncorrectRequestException;
  import org.waarp.gateway.kernel.rest.RestArgument;
  
  import java.net.ConnectException;
  import java.nio.channels.ClosedChannelException;
  
  /**
   *
   */
  public class HttpRestClientSimpleResponseHandler
      extends SimpleChannelInboundHandler<HttpObject> {
    /**
     * Internal Logger
     */
    private static final WaarpLogger logger =
        WaarpLoggerFactory.getLogger(HttpRestClientSimpleResponseHandler.class);
  
    public static final AttributeKey<RestFuture> RESTARGUMENT =
        AttributeKey.valueOf("RestClient.Argument");
  
    private ByteBuf cumulativeBody;
    protected JsonNode jsonObject;
  
    protected void actionFromResponse(final Channel channel) {
      final RestArgument ra = new RestArgument((ObjectNode) jsonObject);
      if (jsonObject == null) {
        logger.warn("Recv: EMPTY");
      } else {
        logger.warn(ra.prettyPrint());
      }
      final RestFuture restFuture = channel.attr(RESTARGUMENT).get();
      restFuture.setRestArgument(ra);
      if (ra.getStatusCode() == HttpResponseStatus.OK.code()) {
        restFuture.setSuccess();
      } else {
        logger.error("Error: " + ra.getStatusMessage());
        restFuture.cancel();
        if (channel.isActive()) {
          WaarpSslUtility.closingSslChannel(channel);
        }
      }
    }
  
   @Override
   protected void channelRead0(final ChannelHandlerContext ctx,
                               final HttpObject msg) throws Exception {
     if (msg instanceof HttpResponse) {
       final HttpResponse response = (HttpResponse) msg;
       final HttpResponseStatus status = response.status();
       logger.debug("{}: {} STATUS: {}", HttpHeaderNames.REFERER,
                    response.headers().get(HttpHeaderNames.REFERER), status);
     }
     if (msg instanceof HttpContent) {
       final HttpContent chunk = (HttpContent) msg;
       if (chunk instanceof LastHttpContent) {
         final ByteBuf content = chunk.content();
         if (content != null && content.isReadable()) {
           if (cumulativeBody != null) {
             cumulativeBody = Unpooled.wrappedBuffer(cumulativeBody, content);
           } else {
             cumulativeBody = content;
           }
         }
         // get the Json equivalent of the Body
         if (cumulativeBody == null) {
           jsonObject = JsonHandler.createObjectNode();
         } else {
           try {
             final String json = cumulativeBody.toString(WaarpStringUtils.UTF8);
             jsonObject = JsonHandler.getFromString(json);
           } catch (final Throwable e2) {
             logger.warn("Error" + " : {}", e2.getMessage());
             throw new HttpIncorrectRequestException(e2);
           }
           cumulativeBody = null;
         }
         actionFromResponse(ctx.channel());
       } else {
         final ByteBuf content = chunk.content();
         if (content != null && content.isReadable()) {
           if (cumulativeBody != null) {
             cumulativeBody = Unpooled.wrappedBuffer(cumulativeBody, content);
           } else {
             cumulativeBody = content;
           }
         }
       }
     }
   }
 
   @Override
   public void exceptionCaught(final ChannelHandlerContext ctx,
                               final Throwable cause) {
     final RestFuture restFuture = ctx.channel().attr(RESTARGUMENT).get();
     if (cause instanceof ClosedChannelException) {
       restFuture.setFailure(cause);
       logger.debug("Close before ending");
       return;
     } else if (cause instanceof ConnectException) {
       restFuture.setFailure(cause);
       if (ctx.channel().isActive()) {
         logger.debug("Will close");
         WaarpSslUtility.closingSslChannel(ctx.channel());
       }
       return;
     }
     restFuture.setFailure(cause);
     logger.error("Error", cause);
     WaarpSslUtility.closingSslChannel(ctx.channel());
   }
 
 }