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#ifndef vtkm_worklet_cosmotools_set_candidate_particles_h
#define vtkm_worklet_cosmotools_set_candidate_particles_h

#include <vtkm/worklet/WorkletMapField.h>

namespace vtkm
{
namespace worklet
{
namespace cosmotools
{

// Worklet to examine each bin against a cutoff and mark its particles as candidates
template <typename T>
class SetCandidateParticles : public vtkm::worklet::WorkletMapField
{
public:
  using TagType = vtkm::List<T>;

  using ControlSignature = void(FieldIn bestPot,          // (input) bin's best potential
                                FieldIn partOffset,       // (input) offset to first particle
                                FieldIn partCount,        // (input) count of particles in bin
                                WholeArrayOut candidate); // (input) z location in bin
  using ExecutionSignature = void(_1, _2, _3, _4);
  using InputDomain = _1;

  T cutoffPotential; // Lowest potential for a candidate bin

  // Constructor
  VTKM_EXEC_CONT
  SetCandidateParticles(T Cutoff)
    : cutoffPotential(Cutoff)
  {
  }

  template <typename OutPortalType>
  VTKM_EXEC void operator()(const T& bestPot,
                            const vtkm::Id& offset,
                            const vtkm::Id& count,
                            const OutPortalType& candidate) const
  {
    if (bestPot <= cutoffPotential)
    {
      for (vtkm::Id part = offset; part < offset + count; part++)
        candidate.Set(part, 1);
    }
  }
}; // SetCandidateParticles
}
}
}

#endif
