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//============================================================================

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//============================================================================
//  Copyright (c) 2016, Los Alamos National Security, LLC
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//  Copyright 2016. Los Alamos National Security, LLC.
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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 viskores_worklet_contourtree_copy_supernodes_h
#define viskores_worklet_contourtree_copy_supernodes_h

#include <viskores/worklet/WorkletMapField.h>

namespace viskores
{
namespace worklet
{
namespace contourtree
{

// Worklet for doing regular to candidate
class CopySupernodes : public viskores::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn isSupernode,             // (input) is this a supernode
                                FieldIn regularID,               // (input) candidate ID
                                FieldIn superID,                 // (input) supernode ID
                                FieldIn upCandidate,             // (input)
                                FieldIn downCandidate,           // (input)
                                WholeArrayOut regularToCritical, // (output)
                                WholeArrayOut supernodes,        // (output) compacted supernodes
                                WholeArrayOut updegree,          // (output) compacted updegree
                                WholeArrayOut downdegree);       // (output) compacted downdegree
  using ExecutionSignature = void(_1, _2, _3, _4, _5, _6, _7, _8, _9);
  using InputDomain = _1;

  // Constructor
  VISKORES_EXEC_CONT
  CopySupernodes() {}

  template <typename OutFieldPortalType>
  VISKORES_EXEC void operator()(const viskores::Id& isSupernode,
                                const viskores::Id& regularID,
                                const viskores::Id& superID,
                                const viskores::Id& upCandidate,
                                const viskores::Id& downCandidate,
                                const OutFieldPortalType& regularToCritical,
                                const OutFieldPortalType& supernodes,
                                const OutFieldPortalType& updegree,
                                const OutFieldPortalType& downdegree) const
  {
    if (isSupernode)
    { // supernode
      // update the inverse lookup, &c.
      regularToCritical.Set(regularID, superID);
      supernodes.Set(superID, regularID);
      updegree.Set(superID, upCandidate);
      downdegree.Set(superID, downCandidate);
    }
  }
}; // CopySupernodes
}
}
}

#endif
