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

  Program:   Visualization Toolkit
  Module:    vtkExtractHistogram.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   vtkExtractHistogram
 * @brief   Extract histogram data (binned values) from any
 * dataset
 *
 * vtkExtractHistogram accepts any vtkDataSet as input and produces a
 * vtkPolyData containing histogram data as output.  The output vtkPolyData
 * will have contain a vtkDoubleArray named "bin_extents" which contains
 * the boundaries between each histogram bin, and a vtkUnsignedLongArray
 * named "bin_values" which will contain the value for each bin.
*/

#ifndef vtkExtractHistogram_h
#define vtkExtractHistogram_h

#include "vtkPVVTKExtensionsCoreModule.h" //needed for exports
#include "vtkTableAlgorithm.h"

class vtkDoubleArray;
class vtkFieldData;
class vtkIntArray;
struct vtkEHInternals;

class VTKPVVTKEXTENSIONSCORE_EXPORT vtkExtractHistogram : public vtkTableAlgorithm
{
public:
  static vtkExtractHistogram* New();
  vtkTypeMacro(vtkExtractHistogram, vtkTableAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

  //@{
  /**
   * Controls which input data component should be binned, for input arrays
   * with more-than-one component
   */
  vtkSetClampMacro(Component, int, 0, VTK_INT_MAX);
  vtkGetMacro(Component, int);
  //@}

  //@{
  /**
   * Controls the number of bins N in the output histogram data
   */
  vtkSetClampMacro(BinCount, int, 1, VTK_INT_MAX);
  vtkGetMacro(BinCount, int);
  //@}

  //@{
  /**
   * Get/Set custom bin ranges to use. These are used only when
   * UseCustomBinRanges is set to true.
   */
  vtkSetVector2Macro(CustomBinRanges, double);
  vtkGetVector2Macro(CustomBinRanges, double);
  //@}

  //@{
  /**
   * When set to true, CustomBinRanges will  be used instead of using the full
   * range for the selected array. By default, set to false.
   */
  vtkSetMacro(UseCustomBinRanges, bool);
  vtkGetMacro(UseCustomBinRanges, bool);
  vtkBooleanMacro(UseCustomBinRanges, bool);
  //@}

  //@{
  /**
   * This option controls whether the algorithm calculates averages
   * of variables other than the primary variable that fall into each
   * bin. False by default.
   */
  vtkSetMacro(CalculateAverages, int);
  vtkGetMacro(CalculateAverages, int);
  vtkBooleanMacro(CalculateAverages, int);
  //@}

protected:
  vtkExtractHistogram();
  ~vtkExtractHistogram();

  /**
   * Returns the data range for the input array to process.
   * This method is not called with this->UseCustomBinRanges is true.
   * Returns true is range could be determined correctly, otherwise returns
   * false and range is set to {VTK_DOUBLE_MAX, VTK_DOUBLE_MIN}. When returning
   * true, the actual data range is returned (without any extra padding).
   */
  virtual bool GetInputArrayRange(vtkInformationVector** inputVector, double range[2]);

  virtual int FillInputPortInformation(int port, vtkInformation* info) VTK_OVERRIDE;

  virtual int RequestData(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) VTK_OVERRIDE;

  // Initialize the bin_extents using the data range for the selected
  // array.
  virtual bool InitializeBinExtents(
    vtkInformationVector** inputVector, vtkDoubleArray* bin_extents, double& min, double& max);

  void BinAnArray(
    vtkDataArray* src, vtkIntArray* vals, double min, double max, vtkFieldData* field);

  void FillBinExtents(vtkDoubleArray* bin_extents, double min, double max);

  double CustomBinRanges[2];
  bool UseCustomBinRanges;
  int Component;
  int BinCount;
  int CalculateAverages;

  vtkEHInternals* Internal;

private:
  void operator=(const vtkExtractHistogram&) VTK_DELETE_FUNCTION;
  vtkExtractHistogram(const vtkExtractHistogram&) VTK_DELETE_FUNCTION;

  int GetInputFieldAssociation();
  vtkFieldData* GetInputFieldData(vtkDataObject* input);
};

#endif
