/*!
   \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()
  {
    if(EP_PendingRequests == 0 ) EP_PendingRequests = new std::list< MPI_Request* >;
    
    if(EP_PendingRequests->size() == 0) return 0;
    
    show_EP_PendingRequests(EP_PendingRequests);
    
    MPI_Status status;
    MPI_Message *message;
    int probed = false;
    int recv_count = 0;
    std::list<MPI_Request* >::iterator it;
    
//    show_EP_PendingRequests(EP_PendingRequests);
    
    
    for(it = EP_PendingRequests->begin(); it!=EP_PendingRequests->end(); it++)
    { 
      if(*(*it) == 0)
      {
        EP_PendingRequests->erase(it);
        
        memcheck("EP_PendingRequests["<<ep_rank<<"]->size() = " << EP_PendingRequests->size());
        it = EP_PendingRequests->begin();
        continue;
      }
      
      if((*(*it))->state == 2)
      {
        EP_PendingRequests->erase(it);
        
        memcheck("EP_PendingRequests["<<ep_rank<<"]->size() = " << EP_PendingRequests->size());
        it = EP_PendingRequests->begin();
        continue;
      }
      
      Message_Check(((*(*it))->comm));
    }
    
    


    for(it = EP_PendingRequests->begin(); it!=EP_PendingRequests->end(); )
    {
      if(*(*it) == 0)
      {
        EP_PendingRequests->erase(it);
        
        memcheck("EP_PendingRequests["<<ep_rank<<"]->size() = " << EP_PendingRequests->size());
        it = EP_PendingRequests->begin();
        continue;
      }
      
      if((*(*it))->state == 2)
      {
        EP_PendingRequests->erase(it);
        
        memcheck("EP_PendingRequests["<<ep_rank<<"]->size() = " << EP_PendingRequests->size());
        it = EP_PendingRequests->begin();
        continue;
      }
      
      if((*(*it))->state == 0)
      {
        #pragma omp critical (_query0)
        {
          MPI_Iprobe((*(*it))->ep_src, (*(*it))->ep_tag, ((*(*it))->comm), &probed, &status);
          if(probed)
          {
            message = new MPI_Message;
            *message = new ep_message;
        
            memcheck("new "<< message <<" : in ep_lib::Request_Check, message = new MPI_Message");
            memcheck("new "<< *message <<" : in ep_lib::Request_Check, *message = new ep_message");
          
          
            MPI_Improbe((*(*it))->ep_src, (*(*it))->ep_tag, (*(*it))->comm, &probed, message, &status);
        
          }
        }
      
        
        if(probed)
        {
          MPI_Get_count(&status, (*(*it))->ep_datatype, &recv_count);
          
          MPI_Imrecv((*(*it))->buf, recv_count, (*(*it))->ep_datatype, message, *it);
          (*(*it))->type = 3;
          (*(*it))->state = 1;

          memcheck("delete "<< status.mpi_status <<" : in ep_lib::Request_Check, delete status.mpi_status");
          delete status.mpi_status;          

          memcheck("delete "<< *message <<" : in ep_lib::Request_Check, delete *message");
          memcheck("delete "<< message <<" : in ep_lib::Request_Check, delete message");

          delete *message;
          delete message;
        
          it++;
          continue;      
        }              
      }
      
      it++;
    }
    
    show_EP_PendingRequests(EP_PendingRequests);
  }
  
  
  
  int Message_Check(MPI_Comm comm)
  {
    if(!comm->is_ep) return MPI_SUCCESS;

    if(comm->is_intercomm)
    {
      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);

        memcheck("new "<< msg <<" : in ep_lib::Message_Check, msg = new ep_message");
        memcheck("new "<< msg->mpi_message <<" : in ep_lib::Message_Check, msg->mpi_message = new ::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);  

#ifdef _showinfo
        printf("status.MPI_TAG = %d, src_loc = %d, dest_loc = %d, ep_tag = %d\n", status.MPI_TAG, src_loc, dest_loc, msg->ep_tag);
#endif

        msg->mpi_status = new ::MPI_Status(status);  
        memcheck("new "<< msg->mpi_status <<" : in ep_lib::Message_Check, msg->mpi_status = new ::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 dest_mpi = comm->ep_comm_ptr->size_rank_info[2].first;
          memcheck("message_queue["<<dest_mpi<<","<<dest_loc<<"]->size = "<<comm->ep_comm_ptr->comm_list[dest_loc]->ep_comm_ptr->message_queue->size());
          #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);

        memcheck("new "<< msg <<" : in ep_lib::Message_Check, msg = new ep_message");
        memcheck("new "<< msg->mpi_message <<" : in ep_lib::Message_Check, msg->mpi_message = new ::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);   
#ifdef _showinfo
        printf("status.MPI_TAG = %d, src_loc = %d, dest_loc = %d, ep_tag = %d\n", status.MPI_TAG, src_loc, dest_loc, msg->ep_tag);
#endif

        msg->mpi_status = new ::MPI_Status(status); 
        memcheck("new "<< msg->mpi_status <<" : in ep_lib::Message_Check, msg->mpi_status = new ::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);
          memcheck("comm->ep_comm_ptr->comm_list["<<dest_loc<<"]->ep_comm_ptr->message_queue->size = "<<comm->ep_comm_ptr->comm_list[dest_loc]->ep_comm_ptr->message_queue->size());
          #pragma omp flush
        }
      }
    }

    Message_Check_intracomm(comm);

    return MPI_SUCCESS;
  }
  
  
  
  void show_EP_PendingRequests(std::list< ep_lib::MPI_Request* > * EP_PendingRequest)
  {
#ifdef _showinfo
    std::list<MPI_Request* >::iterator it;
    
    int i=0;
    
    for(it = EP_PendingRequests->begin(); it!=EP_PendingRequests->end(); it++)
    { 
      if(*(*it) == 0)
      {
        EP_PendingRequests->erase(it);
            
        memcheck("EP_PendingRequests["<<ep_rank<<"]->size() = " << EP_PendingRequests->size());
        it = EP_PendingRequests->begin();
        continue;
      }
      
      if((*(*it))->state == 2)
      {
        EP_PendingRequests->erase(it);
        
        memcheck("EP_PendingRequests["<<ep_rank<<"]->size() = " << EP_PendingRequests->size());
        it = EP_PendingRequests->begin();
        continue;
      }
          
      if((*(*it))->ep_src>6)
        printf("EP_PendingRequests[%d] : ep_src = %d, ep_tag = %d, type = %d, state = %d, comm = %d\n", i, (*(*it))->ep_src, (*(*it))->ep_tag, (*(*it))->type, (*(*it))->state, to_mpi_comm(((*(*it))->comm)->mpi_comm));
      i++;
    }
#endif

  }

  

}