/*
 * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. 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.apache.synapse.commons.emulator.http.producer;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.LastHttpContent;
import org.apache.synapse.commons.emulator.http.dsl.dto.producer.OutgoingMessage;

public class HttpResponseProcessHandler extends ChannelInboundHandlerAdapter {
    private HttpResponseContext responseContext;
    private HttpResponseInformationProcessor responseInformationProcessor;
    private HttpResponseAssertProcessor responseAssertProcessor;
    private OutgoingMessage outgoingMessage;

    public HttpResponseProcessHandler(OutgoingMessage outgoingMessage) {
        this.outgoingMessage = outgoingMessage;
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (msg instanceof HttpResponse) {
            this.responseContext = new HttpResponseContext();
            this.responseInformationProcessor = new HttpResponseInformationProcessor();
            this.responseAssertProcessor = new HttpResponseAssertProcessor();
            HttpResponse response = (HttpResponse) msg;
            responseInformationProcessor.process(response, responseContext);
        }

        if (msg instanceof HttpContent) {
            HttpContent httpContent = (HttpContent) msg;
            ByteBuf content = httpContent.content();

            if (content.isReadable()) {
                this.responseInformationProcessor.appendDecoderResult(responseContext, httpContent, content);
            }

            if (content instanceof LastHttpContent) {
                ctx.fireChannelReadComplete();
            }
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        if (responseAssertProcessor != null) {
            this.responseAssertProcessor.process(responseContext, outgoingMessage);
        }
        ctx.close();
    }
}
