// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright (c) Kitware, Inc.
// SPDX-License-Identifier: BSD-3-Clause
/**
 * @class   vtkCleanUnstructuredGrid
 * @brief   merge duplicate points
 *
 *
 * vtkCleanUnstructuredGrid is a filter that takes unstructured grid data as
 * input and generates unstructured grid data as output. vtkCleanUnstructuredGrid can
 * merge duplicate points (with coincident coordinates) using the vtkMergePoints object
 * to merge points.
 *
 * @sa
 * vtkCleanPolyData
 */

#ifndef vtkCleanUnstructuredGrid_h
#define vtkCleanUnstructuredGrid_h

#include "vtkFiltersGeneralModule.h" // For export macro
#include "vtkSmartPointer.h"
#include "vtkUnstructuredGridAlgorithm.h"

VTK_ABI_NAMESPACE_BEGIN

class vtkIncrementalPointLocator;
class vtkDataSet;

class VTKFILTERSGENERAL_EXPORT vtkCleanUnstructuredGrid : public vtkUnstructuredGridAlgorithm
{
public:
  static vtkCleanUnstructuredGrid* New();
  vtkTypeMacro(vtkCleanUnstructuredGrid, vtkUnstructuredGridAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  ///@{
  /**
   * By default ToleranceIsAbsolute is false and Tolerance is
   * a fraction of Bounding box diagonal, if true, AbsoluteTolerance is
   * used when adding points to locator (merging)
   */
  vtkSetMacro(ToleranceIsAbsolute, bool);
  vtkBooleanMacro(ToleranceIsAbsolute, bool);
  vtkGetMacro(ToleranceIsAbsolute, bool);
  ///@}

  ///@{
  /**
   * Specify tolerance in terms of fraction of bounding box length.
   * Default is 0.0.
   */
  vtkSetClampMacro(Tolerance, double, 0.0, 1.0);
  vtkGetMacro(Tolerance, double);
  ///@}

  ///@{
  /**
   * Specify tolerance in absolute terms. Default is 1.0.
   */
  vtkSetClampMacro(AbsoluteTolerance, double, 0.0, VTK_DOUBLE_MAX);
  vtkGetMacro(AbsoluteTolerance, double);
  ///@}

  ///@{
  /**
   * Set/Get a spatial locator for speeding the search process. By
   * default an instance of vtkMergePoints is used.
   */
  virtual void SetLocator(vtkIncrementalPointLocator* locator);
  virtual vtkIncrementalPointLocator* GetLocator();
  ///@}

  /**
   * Create default locator. Used to create one when none is specified.
   */
  void CreateDefaultLocator(vtkDataSet* input = nullptr);

  /**
   * Release locator
   */
  void ReleaseLocator() { this->SetLocator(nullptr); }

  ///@{
  /**
   * Set/get the desired precision for the output types. See the documentation
   * for the vtkAlgorithm::DesiredOutputPrecision enum for an explanation of
   * the available precision settings.
   */
  vtkSetMacro(OutputPointsPrecision, int);
  vtkGetMacro(OutputPointsPrecision, int);
  ///@}

  ///@{
  /**
   * Set/Get whether to remove points that do not
   * have any cells associated with it.
   * Default is false
   */
  vtkSetMacro(RemovePointsWithoutCells, bool);
  vtkGetMacro(RemovePointsWithoutCells, bool);
  vtkBooleanMacro(RemovePointsWithoutCells, bool);
  ///@}

  ///@{
  /**
   * Set/Get the strategy used to weigh point data on merging points
   *
   * Possibilities:
   * - FIRST_POINT (int(0), default): the point with the lowest index imposes its data on to the
   * merged point
   * - AVERAGING (int(1)): a number average is performed on all the duplicate points
   * - SPATIAL_DENSITY (int(2)): an average by attached cell volume (i.e. for every cell the point
   * is connected to sum cell_volume/number_cell_points) is performed on the point data
   */
  vtkGetMacro(PointDataWeighingStrategy, int);
  vtkSetClampMacro(PointDataWeighingStrategy, int, FIRST_POINT, NUMBER_OF_WEIGHING_TYPES - 1);
  ///@}

  enum DataWeighingType
  {
    FIRST_POINT = 0,
    AVERAGING,
    SPATIAL_DENSITY,
    NUMBER_OF_WEIGHING_TYPES
  };

protected:
  vtkCleanUnstructuredGrid();
  ~vtkCleanUnstructuredGrid() override;

  bool ToleranceIsAbsolute = false;
  double Tolerance = 0.0;
  double AbsoluteTolerance = 1.0;
  bool RemovePointsWithoutCells = false;
  vtkSmartPointer<vtkIncrementalPointLocator> Locator;
  int OutputPointsPrecision = vtkAlgorithm::DEFAULT_PRECISION;
  int PointDataWeighingStrategy = FIRST_POINT;

  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
  int FillInputPortInformation(int port, vtkInformation* info) override;

private:
  vtkCleanUnstructuredGrid(const vtkCleanUnstructuredGrid&) = delete;
  void operator=(const vtkCleanUnstructuredGrid&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
// VTK-HeaderTest-Exclude: vtkCleanUnstructuredGrid.h