/**
 * FairMQSocketZMQ.cxx
 *
 * @since 2012-12-05
 * @author D. Klein, A. Rybalchenko
 */

#include <sstream>

#include "FairMQSocketZMQ.h"
#include "FairMQLogger.h"

boost::shared_ptr<FairMQContextZMQ> FairMQSocketZMQ::fContext = boost::shared_ptr<FairMQContextZMQ>(new FairMQContextZMQ(1));

FairMQSocketZMQ::FairMQSocketZMQ(const string& type, int num, int numIoThreads) :
  fBytesTx(0),
  fBytesRx(0),
  fMessagesTx(0),
  fMessagesRx(0)
{
  stringstream id;
  id << type << "." << num;
  fId = id.str();

  int rc = zmq_ctx_set (fContext->GetContext(), ZMQ_IO_THREADS, numIoThreads);
  if (rc != 0){
    LOG(ERROR) << "failed configuring context, reason: " << zmq_strerror(errno);
  }

  fSocket = zmq_socket(fContext->GetContext(), GetConstant(type));

  rc = zmq_setsockopt(fSocket, ZMQ_IDENTITY, &fId, fId.length());
  if (rc != 0) {
    LOG(ERROR) << "failed setting socket option, reason: " << zmq_strerror(errno);
  }

  if (type == "sub") {
    rc = zmq_setsockopt(fSocket, ZMQ_SUBSCRIBE, NULL, 0);
    if (rc != 0) {
      LOG(ERROR) << "failed setting socket option, reason: " << zmq_strerror(errno);
    }

    if (type == "sub")
    {
        rc = zmq_setsockopt(fSocket, ZMQ_SUBSCRIBE, NULL, 0);
        if (rc != 0)
        {
            LOG(ERROR) << "failed setting socket option, reason: " << zmq_strerror(errno);
        }
    }

    LOG(INFO) << "created socket #" << fId;
}

string FairMQSocketZMQ::GetId()
{
    return fId;
}

void FairMQSocketZMQ::Bind(const string& address)
{
    LOG(INFO) << "bind socket #" << fId << " on " << address;

    int rc = zmq_bind(fSocket, address.c_str());
    if (rc != 0)
    {
        LOG(ERROR) << "failed binding socket #" << fId << ", reason: " << zmq_strerror(errno);
    }
}

void FairMQSocketZMQ::Connect(const string& address)
{
    LOG(INFO) << "connect socket #" << fId << " on " << address;

    int rc = zmq_connect(fSocket, address.c_str());
    if (rc != 0)
    {
        LOG(ERROR) << "failed connecting socket #" << fId << ", reason: " << zmq_strerror(errno);
    }
}

size_t FairMQSocketZMQ::Send(FairMQMessage* msg)
{
    int nbytes = zmq_msg_send(static_cast<zmq_msg_t*>(msg->GetMessage()), fSocket, 0);
    if (nbytes >= 0)
    {
        fBytesTx += nbytes;
        ++fMessagesTx;
        return nbytes;
    }
    if (zmq_errno() == EAGAIN)
    {
        return false;
    }
    LOG(ERROR) << "failed sending on socket #" << fId << ", reason: " << zmq_strerror(errno);
    return nbytes;
}

size_t FairMQSocketZMQ::Receive(FairMQMessage* msg)
{
    int nbytes = zmq_msg_recv(static_cast<zmq_msg_t*>(msg->GetMessage()), fSocket, 0);
    if (nbytes >= 0)
    {
        fBytesRx += nbytes;
        ++fMessagesRx;
        return nbytes;
    }
    if (zmq_errno() == EAGAIN)
    {
        return false;
    }
    LOG(ERROR) << "failed receiving on socket #" << fId << ", reason: " << zmq_strerror(errno);
    return nbytes;
}

void FairMQSocketZMQ::Close()
{
    if (fSocket == NULL)
    {
        return;
    }

    int rc = zmq_close(fSocket);
    if (rc != 0)
    {
        LOG(ERROR) << "failed closing socket, reason: " << zmq_strerror(errno);
    }

    fSocket = NULL;
}

void* FairMQSocketZMQ::GetSocket()
{
    return fSocket;
}

int FairMQSocketZMQ::GetSocket(int nothing)
{
    // dummy method to comply with the interface. functionality not possible in zeromq.
    return -1;
}

void FairMQSocketZMQ::SetOption(const string& option, const void* value, size_t valueSize)
{
    int rc = zmq_setsockopt(fSocket, GetConstant(option), value, valueSize);
    if (rc < 0)
    {
        LOG(ERROR) << "failed setting socket option, reason: " << zmq_strerror(errno);
    }
}

unsigned long FairMQSocketZMQ::GetBytesTx()
{
    return fBytesTx;
}

unsigned long FairMQSocketZMQ::GetBytesRx()
{
    return fBytesRx;
}

unsigned long FairMQSocketZMQ::GetMessagesTx()
{
    return fMessagesTx;
}

unsigned long FairMQSocketZMQ::GetMessagesRx()
{
    return fMessagesRx;
}

int FairMQSocketZMQ::GetConstant(const string& constant)
{
    if (constant == "sub")
        return ZMQ_SUB;
    if (constant == "pub")
        return ZMQ_PUB;
    if (constant == "xsub")
        return ZMQ_XSUB;
    if (constant == "xpub")
        return ZMQ_XPUB;
    if (constant == "push")
        return ZMQ_PUSH;
    if (constant == "pull")
        return ZMQ_PULL;
    if (constant == "snd-hwm")
        return ZMQ_SNDHWM;
    if (constant == "rcv-hwm")
        return ZMQ_RCVHWM;

    return -1;
}

FairMQSocketZMQ::~FairMQSocketZMQ()
{
}