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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.

#include <vtkm/cont/ErrorFilterExecution.h>

#include <vtkm/worklet/ContourTreeUniform.h>

namespace vtkm
{
namespace filter
{

//-----------------------------------------------------------------------------
ContourTreeMesh2D::ContourTreeMesh2D()
  : vtkm::filter::FilterCell<ContourTreeMesh2D>()
{
  this->SetOutputFieldName("saddlePeak");
}

//-----------------------------------------------------------------------------
template <typename T, typename StorageType, typename DerivedPolicy>
vtkm::cont::DataSet ContourTreeMesh2D::DoExecute(
  const vtkm::cont::DataSet& input,
  const vtkm::cont::ArrayHandle<T, StorageType>& field,
  const vtkm::filter::FieldMetadata& fieldMeta,
  const vtkm::filter::PolicyBase<DerivedPolicy>&)
{
  if (fieldMeta.IsPointField() == false)
  {
    throw vtkm::cont::ErrorFilterExecution("ContourTreeMesh2D expects point field input.");
  }

  // Collect sizing information from the dataset
  const auto& dynamicCellSet = input.GetCellSet();
  vtkm::cont::CellSetStructured<2> cellSet;
  dynamicCellSet.CopyTo(cellSet);

  vtkm::Id2 pointDimensions = cellSet.GetPointDimensions();
  vtkm::Id nRows = pointDimensions[0];
  vtkm::Id nCols = pointDimensions[1];

  vtkm::cont::ArrayHandle<vtkm::Pair<vtkm::Id, vtkm::Id>> saddlePeak;

  vtkm::worklet::ContourTreeMesh2D worklet;
  worklet.Run(field, nRows, nCols, saddlePeak);

  return CreateResultFieldCell(input, saddlePeak, this->GetOutputFieldName());
}
//-----------------------------------------------------------------------------
ContourTreeMesh3D::ContourTreeMesh3D()
  : vtkm::filter::FilterCell<ContourTreeMesh3D>()
{
  this->SetOutputFieldName("saddlePeak");
}

//-----------------------------------------------------------------------------
template <typename T, typename StorageType, typename DerivedPolicy>
vtkm::cont::DataSet ContourTreeMesh3D::DoExecute(
  const vtkm::cont::DataSet& input,
  const vtkm::cont::ArrayHandle<T, StorageType>& field,
  const vtkm::filter::FieldMetadata& fieldMeta,
  const vtkm::filter::PolicyBase<DerivedPolicy>&)
{
  if (fieldMeta.IsPointField() == false)
  {
    throw vtkm::cont::ErrorFilterExecution("Point field expected.");
  }

  // Collect sizing information from the dataset
  vtkm::cont::CellSetStructured<3> cellSet;
  input.GetCellSet().CopyTo(cellSet);

  vtkm::Id3 pointDimensions = cellSet.GetPointDimensions();
  vtkm::Id nRows = pointDimensions[0];
  vtkm::Id nCols = pointDimensions[1];
  vtkm::Id nSlices = pointDimensions[2];

  vtkm::cont::ArrayHandle<vtkm::Pair<vtkm::Id, vtkm::Id>> saddlePeak;

  vtkm::worklet::ContourTreeMesh3D worklet;
  worklet.Run(field, nRows, nCols, nSlices, saddlePeak);

  return CreateResult(input, saddlePeak, this->GetOutputFieldName(), fieldMeta);
}
}
} // namespace vtkm::filter
