static char help[] = "Tests late MatSetBlockSizes.\n\n";

#include <petscmat.h>

int main(int argc, char **args)
{
  Mat                    A;
  Vec                    x[4];
  IS                     is;
  ISLocalToGlobalMapping rmap, cmap;
  PetscInt               bs[4], l2gbs[4], rbs, cbs, l2grbs, l2gcbs, i;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
  PetscCall(MatSetSizes(A, 12, 12, PETSC_DECIDE, PETSC_DECIDE));
  PetscCall(MatSetType(A, MATAIJ));
  PetscCall(ISCreateStride(PETSC_COMM_WORLD, 12, 0, 1, &is));
  PetscCall(ISLocalToGlobalMappingCreateIS(is, &rmap));
  PetscCall(ISLocalToGlobalMappingSetBlockSize(rmap, 2));
  PetscCall(ISLocalToGlobalMappingCreateIS(is, &cmap));
  PetscCall(ISLocalToGlobalMappingSetBlockSize(cmap, 2));

  PetscCall(MatSetLocalToGlobalMapping(A, rmap, cmap));
  PetscCall(ISLocalToGlobalMappingDestroy(&rmap));
  PetscCall(ISLocalToGlobalMappingDestroy(&cmap));
  PetscCall(ISDestroy(&is));
  PetscCall(MatSetUp(A));

  PetscCall(MatCreateVecs(A, &x[1], &x[0]));
  PetscCall(MatSetBlockSizes(A, 6, 3));
  PetscCall(MatCreateVecs(A, &x[3], &x[2]));
  for (i = 0; i < 4; i++) {
    ISLocalToGlobalMapping l2g;

    PetscCall(VecGetBlockSize(x[i], &bs[i]));
    PetscCall(VecGetLocalToGlobalMapping(x[i], &l2g));
    PetscCall(ISLocalToGlobalMappingGetBlockSize(l2g, &l2gbs[i]));
    PetscCall(VecDestroy(&x[i]));
  }
  PetscCall(MatGetBlockSizes(A, &rbs, &cbs));
  PetscCall(MatGetLocalToGlobalMapping(A, &rmap, &cmap));
  PetscCall(ISLocalToGlobalMappingGetBlockSize(rmap, &l2grbs));
  PetscCall(ISLocalToGlobalMappingGetBlockSize(cmap, &l2gcbs));
  PetscCall(MatDestroy(&A));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Mat Block sizes: %" PetscInt_FMT " %" PetscInt_FMT " (l2g %" PetscInt_FMT " %" PetscInt_FMT ")\n", rbs, cbs, l2grbs, l2gcbs));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Vec Block sizes: %" PetscInt_FMT " %" PetscInt_FMT " (l2g %" PetscInt_FMT " %" PetscInt_FMT ")\n", bs[0], bs[1], l2gbs[0], l2gbs[1]));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Vec Block sizes: %" PetscInt_FMT " %" PetscInt_FMT " (l2g %" PetscInt_FMT " %" PetscInt_FMT ")\n", bs[2], bs[3], l2gbs[2], l2gbs[3]));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
      nsize: 2

TEST*/