/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include "mpitest.h"

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

{

    int errs = 0;

    int size, rank;

    int source, dest;

    int dims[2], periods[2];

    MPI_Comm comm;

    MTest_Init(&argc, &argv);

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    dims[0] = size;

    periods[0] = 1;

    MPI_Cart_create(MPI_COMM_WORLD, 1, dims, periods, 0, &comm);

    MPI_Cart_shift(comm, 0, 1, &source, &dest);

    if (source != ((rank - 1 + size) % size)) {

        errs++;

        printf("source for shift 1 is %d\n", source);

    }

    if (dest != ((rank + 1) % size)) {

        errs++;

        printf("dest for shift 1 is %d\n", dest);

    }

    MPI_Cart_shift(comm, 0, 0, &source, &dest);

    if (source != rank) {

        errs++;

        printf("Source for shift 0 is %d\n", source);

    }

    if (dest != rank) {

        errs++;

        printf("Dest for shift 0 is %d\n", dest);

    }

    MPI_Cart_shift(comm, 0, -1, &source, &dest);

    if (source != ((rank + 1) % size)) {

        errs++;

        printf("source for shift -1 is %d\n", source);

    }

    if (dest != ((rank - 1 + size) % size)) {

        errs++;

        printf("dest for shift -1 is %d\n", dest);

    }

    /* Now, with non-periodic */

    MPI_Comm_free(&comm);

    periods[0] = 0;

    MPI_Cart_create(MPI_COMM_WORLD, 1, dims, periods, 0, &comm);

    MPI_Cart_shift(comm, 0, 1, &source, &dest);

    if ((rank > 0 && source != (rank - 1)) || (rank == 0 && source != MPI_PROC_NULL)) {

        errs++;

        printf("source for non-periodic shift 1 is %d\n", source);

    }

    if ((rank < size - 1 && dest != rank + 1) || ((rank == size - 1) && dest != MPI_PROC_NULL)) {

        errs++;

        printf("dest for non-periodic shift 1 is %d\n", dest);

    }

    MPI_Cart_shift(comm, 0, 0, &source, &dest);

    if (source != rank) {

        errs++;

        printf("Source for non-periodic shift 0 is %d\n", source);

    }

    if (dest != rank) {

        errs++;

        printf("Dest for non-periodic shift 0 is %d\n", dest);

    }

    MPI_Cart_shift(comm, 0, -1, &source, &dest);

    if ((rank < size - 1 && source != rank + 1) || (rank == size - 1 && source != MPI_PROC_NULL)) {

        errs++;

        printf("source for non-periodic shift -1 is %d\n", source);

    }

    if ((rank > 0 && dest != rank - 1) || (rank == 0 && dest != MPI_PROC_NULL)) {

        errs++;

        printf("dest for non-periodic shift -1 is %d\n", dest);

    }

    MPI_Comm_free(&comm);

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}