/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkHyperOctreeContourFilter.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm 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.

=========================================================================*/
/**
 * @class   vtkHyperOctreeContourFilter
 * @brief   generate isosurfaces/isolines from scalar values
 *
 * vtkContourFilter is a filter that takes as input any dataset and
 * generates on output isosurfaces and/or isolines. The exact form
 * of the output depends upon the dimensionality of the input data.
 * Data consisting of 3D cells will generate isosurfaces, data
 * consisting of 2D cells will generate isolines, and data with 1D
 * or 0D cells will generate isopoints. Combinations of output type
 * are possible if the input dimension is mixed.
 *
 * To use this filter you must specify one or more contour values.
 * You can either use the method SetValue() to specify each contour
 * value, or use GenerateValues() to generate a series of evenly
 * spaced contours. It is also possible to accelerate the operation of
 * this filter (at the cost of extra memory) by using a
 * vtkScalarTree. A scalar tree is used to quickly locate cells that
 * contain a contour surface. This is especially effective if multiple
 * contours are being extracted. If you want to use a scalar tree,
 * invoke the method UseScalarTreeOn().
 *
 * @warning
 * For unstructured data or structured grids, normals and gradients
 * are not computed. Use vtkPolyDataNormals to compute the surface
 * normals.
 *
 * @sa
 * vtkMarchingContourFilter vtkKitwareContourFilter
 * vtkMarchingCubes vtkSliceCubes vtkDividingCubes vtkMarchingSquares
 * vtkImageMarchingCubes
*/

#ifndef vtkHyperOctreeContourFilter_h
#define vtkHyperOctreeContourFilter_h

#include "vtkFiltersHyperTreeModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"

#include "vtkContourValues.h" // Needed for inline methods
#include "vtkCutter.h" // for VTK_SORT_BY_VALUE

class vtkIncrementalPointLocator;
class vtkHyperOctree;
class vtkOrderedTriangulator;
class vtkTetra;
class vtkHyperOctreeCursor;

class vtkUnstructuredGrid;
class vtkUnsignedCharArray;
class vtkIdTypeArray;
class vtkHyperOctreeContourPointsGrabber;
class vtkBitArray;

class VTKFILTERSHYPERTREE_EXPORT vtkHyperOctreeContourFilter : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkHyperOctreeContourFilter,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * Construct object with initial range (0,1) and single contour value
   * of 0.0.
   */
  static vtkHyperOctreeContourFilter *New();

  /**
   * Methods to set / get contour values.
   */

  /**
   * Set a particular contour value at contour number i. The index i ranges
   * between 0<=i<NumberOfContours.
   */
  void SetValue(int i, double value)
  {
      this->ContourValues->SetValue(i,value);
  }

  /**
   * Get the ith contour value.
   */
  double GetValue(int i)
  {
      return this->ContourValues->GetValue(i);
  }

  /**
   * Get a pointer to an array of contour values. There will be
   * GetNumberOfContours() values in the list.
   */
  double *GetValues()
  {
      return this->ContourValues->GetValues();
  }

  /**
   * Fill a supplied list with contour values. There will be
   * GetNumberOfContours() values in the list. Make sure you allocate
   * enough memory to hold the list.
   */
  void GetValues(double *contourValues)
  {
      this->ContourValues->GetValues(contourValues);
  }

  /**
   * Set the number of contours to place into the list. You only really
   * need to use this method to reduce list size. The method SetValue()
   * will automatically increase list size as needed.
   */
  void SetNumberOfContours(int number)
  {
      this->ContourValues->SetNumberOfContours(number);
  }

  /**
   * Get the number of contours in the list of contour values.
   */
  int GetNumberOfContours()
  {
      return this->ContourValues->GetNumberOfContours();
  }

  /**
   * Generate numContours equally spaced contour values between specified
   * range. Contour values will include min/max range values.
   */
  void GenerateValues(int numContours, double range[2])
  {
      this->ContourValues->GenerateValues(numContours, range);
  }

  /**
   * Generate numContours equally spaced contour values between specified
   * range. Contour values will include min/max range values.
   */
  void GenerateValues(int numContours, double
                      rangeStart, double rangeEnd)
  {
      this->ContourValues->GenerateValues(numContours, rangeStart, rangeEnd);
  }

  /**
   * Modified GetMTime Because we delegate to vtkContourValues
   */
  vtkMTimeType GetMTime() override;

  //@{
  /**
   * Set / get a spatial locator for merging points. By default,
   * an instance of vtkMergePoints is used.
   */
  void SetLocator(vtkIncrementalPointLocator *locator);
  vtkGetObjectMacro(Locator,vtkIncrementalPointLocator);
  //@}

  /**
   * Create default locator. Used to create one when none is
   * specified. The locator is used to merge coincident points.
   */
  void CreateDefaultLocator();

protected:
  vtkHyperOctreeContourFilter();
  ~vtkHyperOctreeContourFilter() override;

  int RequestData(vtkInformation* request,
                          vtkInformationVector** inputVector,
                          vtkInformationVector* outputVector) override;
  int RequestUpdateExtent(vtkInformation*,
                                  vtkInformationVector**,
                                  vtkInformationVector*) override;
  int FillInputPortInformation(int port, vtkInformation *info) override;

  /**
   * Do the recursive contour of the node pointed by Cursor.
   */
  void ContourNode();

  /**
   * (i,j,k) are point coordinates at last level
   */
  double ComputePointValue(int ptIndices[3]);

  void ContourNode1D();

  vtkContourValues *ContourValues;
  vtkIncrementalPointLocator *Locator;

  vtkIdList *CellPts; // for 2D case

  vtkHyperOctree *Input;
  vtkPolyData *Output;

  vtkCellArray *NewVerts;
  vtkCellArray *NewLines;
  vtkCellArray *NewPolys;

  vtkCellData *InCD;
  vtkPointData *InPD;
  vtkCellData *OutCD;
  vtkPointData *OutPD;
  vtkOrderedTriangulator *Triangulator;

  vtkHyperOctreeCursor *Sibling; // to avoid allocation in the loop


  vtkDoubleArray *CellScalars;
  vtkTetra *Tetra;
  vtkDoubleArray *TetScalars;

  vtkPolygon *Polygon;

  vtkHyperOctreeCursor *Cursor;
  vtkHyperOctreeCursor *NeighborCursor;

  vtkIdType CellTypeCounter[65536]; // up-to-65536 points per octant
  vtkIdType TotalCounter;
  vtkIdType TemplateCounter; // record the number of octants that succceed
  // to use the template triangulator

  vtkDataArray *InScalars;
  vtkHyperOctreeContourPointsGrabber *Grabber;

  vtkDoubleArray *PointScalars;
  int SortBy;
  int Iter; // iterate over contour values in case of VTK_SORT_BY_CELL

  vtkLine *Line;
  double LeftValue;
  double LeftCoord;

  friend class vtkHyperOctreeContourPointsGrabber;

private:
  vtkHyperOctreeContourFilter(const vtkHyperOctreeContourFilter&) = delete;
  void operator=(const vtkHyperOctreeContourFilter&) = delete;
};
#endif
