/*!
   \file ep_recv.cpp
   \since 2 may 2016

   \brief Definitions of MPI receive functions: MPI_Recv, MPI_Mrecv, MPI_Irecv, MPI_Imrecv
 */


#include "ep_lib.hpp"
#include <mpi.h>
#include "ep_declaration.hpp"

using namespace std;


namespace ep_lib {

	int MPI_Recv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI_Comm comm, MPI_Status *status)
	{
    int dest_rank;
    MPI_Comm_rank(comm, &dest_rank);

    if(!comm.is_ep)
    {
      ::MPI_Comm mpi_comm = static_cast< ::MPI_Comm >(comm.mpi_comm);
      ::MPI_Status mpi_status;
      ::MPI_Recv(buf, count, static_cast< ::MPI_Datatype >(datatype), src<0? MPI_ANY_SOURCE : src, tag<0? MPI_ANY_TAG: tag, mpi_comm, &mpi_status);

      status->ep_src = src;
      status->ep_tag = tag;
      status->ep_datatype = datatype;

      return 0;  
    }

    Message_Check(comm);

    MPI_Request request;
    MPI_Irecv(buf, count, datatype, src, tag, comm, &request);
    MPI_Wait(&request, status);

    return 0;
	}




	int MPI_Irecv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI_Comm comm, MPI_Request *request)
	{

		Debug("MPI_Irecv with EP");
    int dest_rank;
    MPI_Comm_rank(comm, &dest_rank);

 		if(!comm.is_ep)
		{
		  ::MPI_Request mpi_request;
		  ::MPI_Comm mpi_comm = static_cast< ::MPI_Comm > (comm.mpi_comm);
		  ::MPI_Irecv(buf, count, static_cast< ::MPI_Datatype> (datatype), src<0? MPI_ANY_SOURCE : src, tag<0? MPI_ANY_TAG: tag, mpi_comm, &mpi_request);

		  request->mpi_request = mpi_request;
      request->ep_src = src;
      request->ep_datatype = datatype;
      request->ep_tag = tag;
		}

		Message_Check(comm);
		

		request->mpi_request = MPI_REQUEST_NULL_STD;
		request->buf = buf;
    request->comm = comm;
		request->type = 2;

		request->ep_src = src;
    request->ep_tag = tag;
    request->ep_datatype = datatype;


    
		/* With Improbe*/
		Message_Check(comm);

    int flag = false;
    MPI_Message message;
    MPI_Status status;
    
    MPI_Improbe(src, tag, comm, &flag, &message, &status);
            
    if(flag)
    {
      MPI_Imrecv(buf, count, datatype, &message, request);
    }

    return 0;
	}

	int MPI_Imrecv(void *buf, int count, MPI_Datatype datatype, MPI_Message *message, MPI_Request *request)
	{
		Debug("MPI_Imrecv");

		request->type = 3;

    ::MPI_Request mpi_request;
    ::MPI_Message mpi_message = static_cast< ::MPI_Message >(message->mpi_message);
		
		::MPI_Imrecv(buf, count, static_cast< ::MPI_Datatype>(datatype), &mpi_message, &mpi_request);

    request->mpi_request = mpi_request;
    request->ep_datatype = datatype;
    request->ep_tag = message->ep_tag;
    request->ep_src = message->ep_src;
    request->buf = buf;

    return 0;
	}


  int MPI_Mrecv(void *buf, int count, MPI_Datatype datatype, MPI_Message *message, MPI_Status *status)
	{
    Debug("EP Mrecv called\n");

    ::MPI_Status mpi_status;
    ::MPI_Message mpi_message = static_cast< ::MPI_Message >(message->mpi_message);
		
		::MPI_Mrecv(buf, count, static_cast< ::MPI_Datatype>(datatype), &mpi_message, &mpi_status);

    status->mpi_status = new ::MPI_Status(mpi_status);
    status->ep_src = message->ep_src;
    status->ep_datatype = datatype;
    status->ep_tag = message->ep_tag;

    //check_sum_recv(buf, count, datatype, message->ep_src, message->ep_tag);

    return 0;
	}


  

}