/*!
   \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"
#include "ep_mpi.hpp"

using namespace std;

extern std::list< ep_lib::MPI_Request* > * EP_PendingRequests;
#pragma omp threadprivate(EP_PendingRequests)

namespace ep_lib 
{

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

    if(!comm->is_ep) return MPI_Recv_mpi(buf, count, datatype, src, tag, comm, status);
    
    Debug("MPI_Recv with EP");

    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)
  {
    if(!comm->is_ep) return MPI_Irecv_mpi(buf, count, datatype, src, tag, comm, request);
    
    Debug("MPI_Irecv with EP");
    int dest_rank;
    MPI_Comm_rank(comm, &dest_rank);
    
    *request = new ep_request;   
    memcheck("new " << *request <<" : in ep_lib::MPI_Irecv, *request = new ep_request");

    (*request)->mpi_request = new ::MPI_Request;
    memcheck("new " << (*request)->mpi_request << " : in ep_lib::MPI_Irecv, (*request)->mpi_request = new ::MPI_Request");
    
    (*request)->buf = buf;
    (*request)->comm = comm;
    (*request)->type = 2;
    (*request)->state = 0;
    

    (*request)->ep_src = src;
    (*request)->ep_tag = tag;
    (*request)->ep_datatype = datatype;
  
    if(EP_PendingRequests == 0 ) EP_PendingRequests = new std::list< MPI_Request* >;

    EP_PendingRequests->push_back(request);  
    int ep_rank = comm->ep_comm_ptr->size_rank_info[0].first;
    memcheck("EP_PendingRequests["<<ep_rank<<"]->size() = " << EP_PendingRequests->size());                                                              
                                          
    return Request_Check();
  }
  
  int MPI_Mrecv(void *buf, int count, MPI_Datatype datatype, MPI_Message *message, MPI_Status *status)
  {
    Debug("MPI_Mrecv with MPI/EP");

    status->mpi_status = new ::MPI_Status;
    memcheck("new " << status->mpi_status << " : in ep_lib::MPI_Mrecv, status->mpi_status = new ::MPI_Status");
    
    ::MPI_Mrecv(buf, count, to_mpi_type(datatype), static_cast< ::MPI_Message* >((*message)->mpi_message), to_mpi_status_ptr(*status));

    
    status->ep_src = (*message)->ep_src;
    status->ep_datatype = datatype;
    status->ep_tag = (*message)->ep_tag;

    memcheck("delete " << (*message)->mpi_message << " : in ep_lib::MPI_Mrecv, delete (*message)->mpi_message");
    delete (*message)->mpi_message;

#ifdef _check_sum
    check_sum_recv(buf, count, datatype, message->ep_src, message->ep_tag);
#endif

    return Request_Check();
  }


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

    (*request)->type = 3;
    (*request)->ep_datatype = datatype;
    (*request)->ep_tag = (*message)->ep_tag;
    (*request)->ep_src = (*message)->ep_src;
	
    ::MPI_Imrecv(buf, count, to_mpi_type(datatype), to_mpi_message_ptr(*message), to_mpi_request_ptr(*request));		
    
    memcheck("delete " << (*message)->mpi_message << " : in ep_lib::MPI_Imrecv, delete (*message)->mpi_message");
    delete (*message)->mpi_message;

#ifdef _check_sum
    check_sum_recv(buf, count, datatype, message->ep_src, message->ep_tag);
#endif

    
    return Request_Check();
  }


   int MPI_Recv_mpi(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI_Comm comm, MPI_Status *status)
  {
    Debug("MPI_Recv with MPI");
    status->ep_src = src;
    status->ep_tag = tag;
    status->ep_datatype = datatype;
    
    return ::MPI_Recv(buf, count, to_mpi_type(datatype), src<0? MPI_ANY_SOURCE : src, tag<0? MPI_ANY_TAG: tag, to_mpi_comm(comm->mpi_comm), to_mpi_status_ptr(*status)); 
  }
  
  int MPI_Irecv_mpi(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI_Comm comm, MPI_Request *request)
  {
    Debug("MPI_Irecv with MPI");
    int dest_rank;
    MPI_Comm_rank(comm, &dest_rank);
    
    *request = new ep_request;
    memcheck("new "<< *request <<" : in ep_lib::MPI_Irecv, *request = new ep_request");

    (*request)->mpi_request = new ::MPI_Request;
    memcheck("new "<< (*request)->mpi_request <<" : in ep_lib::MPI_Irecv, (*request)->mpi_request = new ::MPI_Request");
      
    (*request)->ep_src = src;
    (*request)->ep_datatype = datatype;
    (*request)->type = 2;
    (*request)->ep_tag = tag;
    
    return ::MPI_Irecv(buf, count, to_mpi_type(datatype), src<0? MPI_ANY_SOURCE : src, tag<0? MPI_ANY_TAG: tag, to_mpi_comm(comm->mpi_comm), to_mpi_request_ptr(*request));
  }
}