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

   \brief Definitions of MPI endpoint function: Message_Check
 */

#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 Request_Check()
  {
    MPI_Status status;
    MPI_Message *message;
    int probed = false;
    int recv_count = 0;
    std::list<MPI_Request* >::iterator it;
    
    if(EP_PendingRequests == 0 ) return 0;
    
    for(it = EP_PendingRequests->begin(); it!=EP_PendingRequests->end(); it++)
    { 
      Message_Check(((*(*it))->comm));
    }


    for(it = EP_PendingRequests->begin(); it!=EP_PendingRequests->end(); )
    {
      if((*(*it))->state == 0)
      {
          
        message = new MPI_Message;
        *message = new ep_message;
        
        printf("new %p : in ep_lib::Request_Check, message = new MPI_Message\n", message);
        printf("new %p : in ep_lib::Request_Check, *message = new ep_message\n", *message);
          
          
        MPI_Improbe((*(*it))->ep_src, (*(*it))->ep_tag, ((*(*it))->comm), &probed, message, &status);
        printf("in Request_Check, after improbe, mpi_status = %p\n", to_mpi_status_ptr(status));
      
        
        if(probed)
        {
          ::MPI_Get_count(to_mpi_status_ptr(status), to_mpi_type((*(*it))->ep_datatype), &recv_count);
          
          printf("in Request_Check, imrecv, buf = %p, recv_count = %d, status = %p\n", (*(*it))->buf, recv_count, to_mpi_status_ptr(status));
          MPI_Imrecv((*(*it))->buf, recv_count, (*(*it))->ep_datatype, message, *it);
          (*(*it))->type = 3;
          (*(*it))->state = 1;
          

          printf("delete %p : in ep_lib::Request_Check, delete *message\n", *message);
          printf("delete %p : in ep_lib::Request_Check, delete message\n", message);

          delete *message;
          delete message;
        
          it++;
          continue;      
        }      
      }
      
      if((*(*it))->state == 2)
      {
        printf("delete %p : in ep_lib::Request_Check, delete (*(*it))\n", (*(*it)));
        delete (*(*it));
        
        EP_PendingRequests->erase(it);
        printf("EP_PendingRequests->size() = %lu\n", EP_PendingRequests->size());
        it = EP_PendingRequests->begin();
        continue;
      }
      else it++;
    }
  }
  
  
  
  int Message_Check(MPI_Comm comm)
  {
    if(!comm->is_ep) return MPI_SUCCESS;

    if(comm->is_intercomm)
    {
      return  Message_Check_intercomm(comm);
    }
    
    return Message_Check_intracomm(comm);

  }
  
  
  int Message_Check_intracomm(MPI_Comm comm)
  {
    
    int flag = true;
    ::MPI_Status status;
    ::MPI_Message message;

    while(flag) // loop until the end of global queue
    {
      Debug("Message probing for intracomm\n");
     
      #pragma omp critical (_mpi_call)
      {
        ::MPI_Iprobe(MPI_ANY_SOURCE, MPI_ANY_TAG, to_mpi_comm(comm->mpi_comm), &flag, &status);
        if(flag)
        {
          Debug("find message in mpi comm \n");
          ::MPI_Mprobe(status.MPI_SOURCE, status.MPI_TAG, to_mpi_comm(comm->mpi_comm), &message, &status);
        }
      }

      
      if(flag)
      {
        MPI_Message msg = new ep_message; 
        msg->mpi_message = new ::MPI_Message(message);

        printf("new %p : in ep_lib::Message_Check, msg = new ep_message\n", msg);
        printf("new %p : in ep_lib::Message_Check, msg->mpi_message = new ::MPI_Message\n", msg->mpi_message);
              

        msg->ep_tag  = bitset<15>(status.MPI_TAG >> 16).to_ulong(); 
        int src_loc  = bitset<8> (status.MPI_TAG >> 8) .to_ulong(); 
        int dest_loc = bitset<8> (status.MPI_TAG)	    .to_ulong();
        int src_mpi  = status.MPI_SOURCE;
             
        msg->ep_src  = get_ep_rank(comm, src_loc,  src_mpi);       
        msg->mpi_status = new ::MPI_Status(status);  
        printf("new %p : in ep_lib::Message_Check, msg->mpi_status = new ::MPI_Status\n", msg->mpi_status);

        #pragma omp critical (_query)
        {
          #pragma omp flush
          comm->ep_comm_ptr->comm_list[dest_loc]->ep_comm_ptr->message_queue->push_back(msg);  
          int test_count;
          ::MPI_Get_count(static_cast< ::MPI_Status* >(msg->mpi_status), 1275070475, &test_count);
          printf("status1 = %p, test_count2 = %d\n", static_cast< ::MPI_Status* >(msg->mpi_status), test_count);
          
          ::MPI_Get_count(static_cast< ::MPI_Status* >(comm->ep_comm_ptr->comm_list[dest_loc]->ep_comm_ptr->message_queue->back()->mpi_status), 1275070475, &test_count);
          printf("status2 = %p, test_count2 = %d\n", static_cast< ::MPI_Status* >(comm->ep_comm_ptr->comm_list[dest_loc]->ep_comm_ptr->message_queue->back()->mpi_status), test_count);
                   
          #pragma omp flush
        }
      }
    }

    return MPI_SUCCESS;
  }


  
  
  


  int Message_Check_intercomm(MPI_Comm comm)
  {
    if(!comm->ep_comm_ptr->intercomm->mpi_inter_comm) return 0;

    Debug("Message probing for intercomm\n");

    int flag = true;
    ::MPI_Message message;
    ::MPI_Status status;
    int current_ep_rank;
    MPI_Comm_rank(comm, &current_ep_rank);

    while(flag) // loop until the end of global queue "comm->ep_comm_ptr->intercomm->mpi_inter_comm"
    {
      Debug("Message probing for intracomm\n");

      #pragma omp critical (_mpi_call)
      {
        ::MPI_Iprobe(MPI_ANY_SOURCE, MPI_ANY_TAG, to_mpi_comm(comm->ep_comm_ptr->intercomm->mpi_inter_comm), &flag, &status);
        if(flag)
        {
          Debug("find message in mpi comm \n");
          ::MPI_Mprobe(status.MPI_SOURCE, status.MPI_TAG, to_mpi_comm(comm->ep_comm_ptr->intercomm->mpi_inter_comm), &message, &status);
        }
      }
      

      if(flag)
      {

        MPI_Message msg = new ep_message; 
        msg->mpi_message = new ::MPI_Message(message);

        printf("new %p : in ep_lib::Message_Check, msg = new ep_message\n", msg);
        printf("new %p : in ep_lib::Message_Check, msg->mpi_message = new ::MPI_Message\n", msg->mpi_message);
              

        msg->ep_tag  = bitset<15>(status.MPI_TAG >> 16).to_ulong(); 
        int src_loc  = bitset<8> (status.MPI_TAG >> 8) .to_ulong(); 
        int dest_loc = bitset<8> (status.MPI_TAG)	    .to_ulong();
        int src_mpi  = status.MPI_SOURCE;
        int current_inter = comm->ep_comm_ptr->intercomm->local_rank_map->at(current_ep_rank).first;
             
        msg->ep_src  = get_ep_rank(comm, src_loc,  src_mpi);       
        msg->mpi_status = new ::MPI_Status(status);  
        printf("new %p : in ep_lib::Message_Check, msg->mpi_status = new ::MPI_Status\n", msg->mpi_status);

        #pragma omp critical (_query)
        {
          #pragma omp flush
          comm->ep_comm_ptr->comm_list[dest_loc]->ep_comm_ptr->message_queue->push_back(msg);
          #pragma omp flush
        }
      }
    }

    Message_Check_intracomm(comm);

    return MPI_SUCCESS;
  }

  

}