#include "MyMPI.hpp"
#include "P2PComm.hpp"
#include <iostream> 

using std::cout;
using std::endl;
using namespace MF;

int main(int argc, char* argv[])
{
  const MyMPI* mpi = MyMPI::instance();
  const int master = 0;
  const unsigned int cntAlpha = 26 + 1;

  const unsigned int cntBlock = 3;
  const int lenBlock[cntBlock] = {3, 3, 3};
  const int displ[cntBlock] = {0, 6, 12};
  const MPI::Datatype type[cntBlock] = {MPI::CHAR, MPI::CHAR, MPI::CHAR};

  MPI::Datatype Alphabet = MPI::Datatype::Create_struct(cntBlock, &lenBlock[0], &displ[0], &type[0]);
  Alphabet.Commit();

  if (mpi->rank() == master)  //master
  {
    char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    const int tag = 0;
    Transceiver<> transceiver;

    for (int dest=1; dest<mpi->size(); ++dest)
    {
      transceiver.send(&alphabet, 1, Alphabet, dest, tag);
    }
  }
  else
  {
    const int from  = master;
    const int tag  = 0;
    MPI::Status status;
    Transceiver<> transceiver;
    char toRecv[cntAlpha];

    transceiver.recv(&toRecv, 1, Alphabet, from, tag, status);

    toRecv[26] = '\0';//explicit termination
    cout << *mpi->instance() << " received: " << toRecv << endl;
  }

  Alphabet.Free();
  return 0;
}