static char help[] = "Tests the different MatColoring implementations.\n\n";

#include <petscmat.h>

int main(int argc, char **args)
{
  Mat         C;
  PetscViewer viewer;
  char        file[128];
  PetscBool   flg;
  MatColoring ctx;
  ISColoring  coloring;
  PetscMPIInt size;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));

  PetscCall(PetscOptionsGetString(NULL, NULL, "-f", file, sizeof(file), &flg));
  PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_USER, "Must use -f filename to load sparse matrix");
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &viewer));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &C));
  PetscCall(MatLoad(C, viewer));
  PetscCall(PetscViewerDestroy(&viewer));

  PetscCall(MatColoringCreate(C, &ctx));
  PetscCall(MatColoringSetFromOptions(ctx));
  PetscCall(MatColoringApply(ctx, &coloring));
  PetscCall(MatColoringTest(ctx, coloring));
  if (size == 1) {
    /* jp, power and greedy have bug -- need to be fixed */
    PetscCall(MatISColoringTest(C, coloring));
  }

  /* Free data structures */
  PetscCall(ISColoringDestroy(&coloring));
  PetscCall(MatColoringDestroy(&ctx));
  PetscCall(MatDestroy(&C));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
      nsize: {{3}}
      requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES)
      args: -f ${DATAFILESPATH}/matrices/arco1 -mat_coloring_type {{ jp power natural greedy}} -mat_coloring_distance {{ 1 2}}
      output_file: output/empty.out

   test:
      suffix: 2
      nsize: {{1 2}}
      requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES)
      args: -f ${DATAFILESPATH}/matrices/arco1 -mat_coloring_type {{sl lf id}} -mat_coloring_distance 2
      output_file: output/empty.out

TEST*/