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//  This code is based on the algorithm presented in the paper:
//  “Parallel Peak Pruning for Scalable SMP Contour Tree Computation.”
//  Hamish Carr, Gunther Weber, Christopher Sewell, and James Ahrens.
//  Proceedings of the IEEE Symposium on Large Data Analysis and Visualization
//  (LDAV), October 2016, Baltimore, Maryland.

#ifndef vtkm_worklet_contourtree_set_join_and_split_arcs_h
#define vtkm_worklet_contourtree_set_join_and_split_arcs_h

#include <vtkm/worklet/WorkletMapField.h>
#include <vtkm/worklet/contourtree/Types.h>

namespace vtkm
{
namespace worklet
{
namespace contourtree
{

// Worklet for doing regular to candidate
class SetJoinAndSplitArcs : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn regularID,              // (input)
                                WholeArrayIn joinMergeArcs,     // (input)
                                WholeArrayIn splitMergeArcs,    // (input)
                                WholeArrayIn regularToCritical, // (input)
                                FieldOut joinArc,               // (output)
                                FieldOut splitArc);             // (output)
  using ExecutionSignature = void(_1, _2, _3, _4, _5, _6);
  using InputDomain = _1;

  // Constructor
  VTKM_EXEC_CONT
  SetJoinAndSplitArcs() {}

  template <typename InFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& regularID,
                            const InFieldPortalType& joinMergeArcs,
                            const InFieldPortalType& splitMergeArcs,
                            const InFieldPortalType& regularToCritical,
                            vtkm::Id& joinArc,
                            vtkm::Id& splitArc) const
  {
    // use it to grab join arc target
    vtkm::Id joinTo = joinMergeArcs.Get(regularID);
    // and set the join arc
    if (joinTo == NO_VERTEX_ASSIGNED)
      joinArc = NO_VERTEX_ASSIGNED;
    else
      joinArc = regularToCritical.Get(joinTo);
    // now grab split arc target
    vtkm::Id splitTo = splitMergeArcs.Get(regularID);
    // and set the split arc
    if (splitTo == NO_VERTEX_ASSIGNED)
      splitArc = NO_VERTEX_ASSIGNED;
    else
      splitArc = regularToCritical.Get(splitTo);
  }
}; // SetJoinAndSplitArcs
}
}
}

#endif