/**
 * Copyright 2013-2015 Seagate Technology LLC.
 *
 * This Source Code Form is subject to the terms of the Mozilla
 * Public License, v. 2.0. If a copy of the MPL was not
 * distributed with this file, You can obtain one at
 * https://mozilla.org/MP:/2.0/.
 * 
 * This program is distributed in the hope that it will be useful,
 * but is provided AS-IS, WITHOUT ANY WARRANTY; including without 
 * the implied warranty of MERCHANTABILITY, NON-INFRINGEMENT or 
 * FITNESS FOR A PARTICULAR PURPOSE. See the Mozilla Public 
 * License for more details.
 *
 * See www.openkinetic.org for more project information
 */
package com.seagate.kinetic.simulator.io.provider.nio.udt;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.udt.UdtMessage;

import java.util.logging.Level;
import java.util.logging.Logger;

import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import com.seagate.kinetic.common.lib.KineticMessage;
import com.seagate.kinetic.proto.Kinetic.Command;
import com.seagate.kinetic.proto.Kinetic.Message;
import com.seagate.kinetic.proto.KineticIo.ExtendedMessage;
import com.seagate.kinetic.simulator.io.provider.spi.MessageService;

/**
 * Please note: This class is for evaluation only and in prototype state.
 *
 * @author chiaming
 *
 */
public class UdtRequestProcessRunner implements
Runnable {

    private static final Logger logger = Logger
            .getLogger(UdtRequestProcessRunner.class.getName());

    private MessageService service = null;
    private ChannelHandlerContext ctx = null;
    private byte[] request = null;

    public UdtRequestProcessRunner(MessageService service,
            ChannelHandlerContext ctx, byte[] request) {

        this.service = service;
        this.ctx = ctx;
        this.request = request;
    }

    @Override
    public void run() {
        try {

            // extended request builder
            ExtendedMessage.Builder extendedBuilder = ExtendedMessage
                    .newBuilder().mergeFrom(request);

            // build extended message
            ExtendedMessage extendedMessage = extendedBuilder.build();

            // create kinetic message
            KineticMessage km = new KineticMessage();

            // set interface message
            km.setMessage(extendedMessage.getInterfaceMessage());
            
         // get command bytes
            ByteString commandBytes = extendedMessage.getInterfaceMessage().getCommandBytes();
            
            // build command
            Command.Builder commandBuilder = Command.newBuilder();
            
            try {
                commandBuilder.mergeFrom(commandBytes);
                km.setCommand(commandBuilder.build());
            } catch (InvalidProtocolBufferException e) {
               logger.log(Level.WARNING, e.getMessage(), e);
            }

            // set optiona value
            if (extendedMessage.hasValue()) {
                km.setValue(extendedMessage.getValue().toByteArray());
            }

            // process request
            KineticMessage kmresp = service.processRequest(km);

            // create response builder
            ExtendedMessage.Builder extendedResponse = ExtendedMessage
                    .newBuilder();

            // set response interface message
            extendedResponse.setInterfaceMessage((Message.Builder) kmresp
                    .getMessage());

            // set response value
            if (kmresp.getValue() != null) {
                extendedResponse
                .setValue(ByteString.copyFrom(kmresp.getValue()));
            }

            // get serialized bytes
            byte[] data = extendedResponse.build().toByteArray();

            ByteBuf byteBuf = Unpooled.buffer(data.length);
            byteBuf.writeBytes(data);

            UdtMessage udt = new UdtMessage(byteBuf);

            ctx.writeAndFlush(udt);
        } catch (Exception e) {
            logger.log(Level.WARNING, e.getMessage(), e);
        }
    }

}