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// Epetra_Export classes
// This code should be run with at least two processes

#include "Didasko_ConfigDefs.h"
#if defined(HAVE_DIDASKO_EPETRA)

#include "Epetra_ConfigDefs.h"
#ifdef HAVE_MPI
#include "mpi.h"
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_Map.h"
#include "Epetra_Vector.h"
#include "Epetra_Export.h"

int main(int argc, char *argv[]) {

#ifdef HAVE_MPI
  MPI_Init(&argc, &argv);
  Epetra_MpiComm Comm(MPI_COMM_WORLD);
#else
  Epetra_SerialComm Comm;
#endif

  int NumGlobalElements = 4; // global dimension of the problem

  int NumMyElements; // local nodes
  Epetra_IntSerialDenseVector MyGlobalElements;

  if( Comm.MyPID() == 0 ) {
    NumMyElements = 3;
    MyGlobalElements.Size(NumMyElements);
    MyGlobalElements[0] = 0;
    MyGlobalElements[1] = 1;
    MyGlobalElements[2] = 2;
  } else {
    NumMyElements = 3;
    MyGlobalElements.Size(NumMyElements);
    MyGlobalElements[0] = 1;
    MyGlobalElements[1] = 2;
    MyGlobalElements[2] = 3;
  }

  // create a map
  Epetra_Map Map(-1,MyGlobalElements.Length(),
         MyGlobalElements.Values(),0, Comm);

  // create a vector based on map
  Epetra_Vector x(Map);
  for( int i=0 ; i<NumMyElements ; ++i )
    x[i] = 10*( Comm.MyPID()+1 );
  cout << x;

  // create a target map, in which all the elements are on proc 0
  int NumMyElements_target;

  if( Comm.MyPID() == 0 )
    NumMyElements_target = NumGlobalElements;
  else
    NumMyElements_target = 0;

  Epetra_Map TargetMap(-1,NumMyElements_target,0,Comm);

  Epetra_Export Exporter(Map,TargetMap);

  // work on vectors
  Epetra_Vector y(TargetMap);

  y.Export(x,Exporter,Add);

  cout << y;

#ifdef HAVE_MPI
  MPI_Finalize();
#endif

  return(EXIT_SUCCESS);

}

#else

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
  puts("Please configure Didasko with:\n"
       "--enable-epetra");

  return 0;
}

#endif
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