static char help[] = "Landau collision operator driver\n\n";

#include <petscts.h>
#include <petsclandau.h>

int main(int argc, char **argv)
{
  DM             dm;
  Vec            X,X_0;
  PetscErrorCode ierr;
  PetscInt       dim=2;
  TS             ts;
  Mat            J;
  SNES           snes;
  KSP            ksp;
  PC             pc;
  SNESLineSearch linesearch;
  PetscReal      time;

  ierr = PetscInitialize(&argc, &argv, NULL,help);if (ierr) return ierr;
  ierr = PetscOptionsGetInt(NULL,NULL, "-dim", &dim, NULL);CHKERRQ(ierr);
  /* Create a mesh */
  ierr = LandauCreateVelocitySpace(PETSC_COMM_SELF, dim, "", &X, &J, &dm);CHKERRQ(ierr);
  ierr = DMSetUp(dm);CHKERRQ(ierr);
  ierr = VecDuplicate(X,&X_0);CHKERRQ(ierr);
  ierr = VecCopy(X,X_0);CHKERRQ(ierr);
  ierr = LandauPrintNorms(X,0);CHKERRQ(ierr);
  ierr = DMSetOutputSequenceNumber(dm, 0, 0.0);CHKERRQ(ierr);
  ierr = DMViewFromOptions(dm,NULL,"-dm_view");CHKERRQ(ierr);
  ierr = VecViewFromOptions(X,NULL,"-vec_view");CHKERRQ(ierr);
  /* Create timestepping solver context */
  ierr = TSCreate(PETSC_COMM_SELF,&ts);CHKERRQ(ierr);
  ierr = TSSetDM(ts,dm);CHKERRQ(ierr);
  ierr = TSGetSNES(ts,&snes);CHKERRQ(ierr);
  ierr = SNESGetLineSearch(snes,&linesearch);CHKERRQ(ierr);
  ierr = SNESLineSearchSetType(linesearch,SNESLINESEARCHBASIC);CHKERRQ(ierr);
  ierr = TSSetIFunction(ts,NULL,LandauIFunction,NULL);CHKERRQ(ierr);
  ierr = TSSetIJacobian(ts,J,J,LandauIJacobian,NULL);CHKERRQ(ierr);
  ierr = TSSetExactFinalTime(ts,TS_EXACTFINALTIME_STEPOVER);CHKERRQ(ierr);
  ierr = SNESGetKSP(snes,&ksp);CHKERRQ(ierr);
  ierr = KSPGetPC(ksp,&pc);CHKERRQ(ierr);
  ierr = TSSetFromOptions(ts);CHKERRQ(ierr);
  ierr = TSSetSolution(ts,X);CHKERRQ(ierr);
  ierr = TSSolve(ts,X);CHKERRQ(ierr);
  ierr = LandauPrintNorms(X,1);CHKERRQ(ierr);
  ierr = TSGetTime(ts, &time);CHKERRQ(ierr);
  ierr = DMSetOutputSequenceNumber(dm, 1, time);CHKERRQ(ierr);
  ierr = VecViewFromOptions(X,NULL,"-vec_view");CHKERRQ(ierr);
  ierr = VecAXPY(X,-1,X_0);CHKERRQ(ierr);
  /* clean up */
  ierr = LandauDestroyVelocitySpace(&dm);CHKERRQ(ierr);
  ierr = TSDestroy(&ts);CHKERRQ(ierr);
  ierr = VecDestroy(&X);CHKERRQ(ierr);
  ierr = VecDestroy(&X_0);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return ierr;
}

/*TEST
  testset:
    requires: p4est !complex double
    output_file: output/ex1_0.out
    args: -dm_landau_num_species_grid 1,2 -petscspace_degree 3 -petscspace_poly_tensor 1 -dm_landau_type p4est -dm_landau_ion_masses 2,4 -dm_landau_ion_charges 1,18 -dm_landau_thermal_temps 5,5,.5 -dm_landau_n 1.00018,1,1e-5 -dm_landau_n_0 1e20 -ts_monitor -snes_rtol 1.e-14 -snes_stol 1.e-14 -snes_monitor -snes_converged_reason -ts_type arkimex -ts_arkimex_type 1bee -ts_max_snes_failures -1 -ts_rtol 1e-1 -ts_dt 1.e-1 -ts_max_time 1 -ts_adapt_clip .5,1.25 -ts_adapt_scale_solve_failed 0.75 -ts_adapt_time_step_increase_delay 5 -ts_max_steps 1 -pc_type lu -ksp_type preonly -dm_landau_amr_levels_max 2,1
    test:
      suffix: cpu
      args: -dm_landau_device_type cpu
    test:
      suffix: kokkos
      requires: kokkos_kernels
      args: -dm_landau_device_type kokkos -dm_mat_type aijkokkos -dm_vec_type kokkos
    test:
      suffix: cuda
      requires: cuda
      args: -dm_landau_device_type cuda -dm_mat_type aijcusparse -dm_vec_type cuda -mat_cusparse_use_cpu_solve

TEST*/