//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//
//  Copyright 2014 Sandia Corporation.
//  Copyright 2014 UT-Battelle, LLC.
//  Copyright 2014 Los Alamos National Security.
//
//  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
//  the U.S. Government retains certain rights in this software.
//
//  Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
//  Laboratory (LANL), the U.S. Government retains certain rights in
//  this software.
//============================================================================

#ifndef vtk_m_filter_Mask_h
#define vtk_m_filter_Mask_h

#include <vtkm/filter/CleanGrid.h>
#include <vtkm/filter/FilterDataSet.h>
#include <vtkm/worklet/Mask.h>

namespace vtkm
{
namespace filter
{
/// \brief Subselect cells using a stride
///
/// Extract only every Nth cell where N is equal to a stride value
class Mask : public vtkm::filter::FilterDataSet<Mask>
{
public:
  VTKM_CONT
  Mask();

  // When CompactPoints is set, instead of copying the points and point fields
  // from the input, the filter will create new compact fields without the unused elements
  VTKM_CONT
  bool GetCompactPoints() const { return this->CompactPoints; }
  VTKM_CONT
  void SetCompactPoints(bool value) { this->CompactPoints = value; }

  // Set the stride of the subsample
  VTKM_CONT
  vtkm::Id GetStride() const { return this->Stride; }
  VTKM_CONT
  void SetStride(vtkm::Id& stride) { this->Stride = stride; }

  template <typename DerivedPolicy, typename DeviceAdapter>
  VTKM_CONT vtkm::filter::Result DoExecute(const vtkm::cont::DataSet& input,
                                           const vtkm::filter::PolicyBase<DerivedPolicy>& policy,
                                           const DeviceAdapter& tag);

  //Map a new field onto the resulting dataset after running the filter
  template <typename T, typename StorageType, typename DerivedPolicy, typename DeviceAdapter>
  VTKM_CONT bool DoMapField(vtkm::filter::Result& result,
                            const vtkm::cont::ArrayHandle<T, StorageType>& input,
                            const vtkm::filter::FieldMetadata& fieldMeta,
                            const vtkm::filter::PolicyBase<DerivedPolicy>& policy,
                            const DeviceAdapter& tag);

private:
  vtkm::Id Stride;
  bool CompactPoints;
  vtkm::filter::CleanGrid Compactor;
  vtkm::worklet::Mask Worklet;
};
}
} // namespace vtkm::filter

#include <vtkm/filter/Mask.hxx>

#endif // vtk_m_filter_Mask_h
