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

  Program:   Visualization Toolkit
  Module:    vtkReconstructFromMoments.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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     PURPOSE.  See the above copyright notice for more information.

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

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/**
 * @class   vtkReconstructFromMoments
 * @brief   reconstruct the underlying function from its moments
 *
 * vtkReconstructFromMoments is a filter that takes the momentData as
 * produced by vtkComputeMoments or vtkMomentInvariants and a grid. It
 * reconstructs the function from the moments, just like from the
 * coefficients of a taylor series. There are in principal three
 * applications.
 * 1. If we put in the moments of the pattern and the grid of the pattern,
 * we see what the algorithm can actually se during the pattern detection.
 * 2. If we put in the normalized moments of the pattern and the grid of the
 * pattern, we how the standard position looks like.
 * 3. If we put in the moments of the field and the original field data, we
 * can see how well the subset of points, on which the moments were computed,
 * actually represents the field For the reconstruction, we need to
 * orthonormalize the moments first. Then, we multiply the coefficients with
 * their coresponding basis function and add them up.
 * @par Thanks:
 * Developed by Roxana Bujack at Los Alamos National Laboratory.
 */

#ifndef vtkReconstructFromMoments_h
#define vtkReconstructFromMoments_h

#include "vtkDataSetAlgorithm.h"
#include "vtkFiltersMomentInvariantsModule.h" // For export macro

#include <vector> // For internal vector methods

class vtkImageData;

class VTKFILTERSMOMENTINVARIANTS_EXPORT vtkReconstructFromMoments : public vtkDataSetAlgorithm
{
public:
  static vtkReconstructFromMoments* New();

  vtkTypeMacro(vtkReconstructFromMoments, vtkDataSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * standard pipeline input for port 1
   * This is the data as produced by vtkComputeMoments or vtkMomentInvariants.
   */
  void SetMomentsData(vtkDataObject* input) { this->SetInputData(0, input); };

  /**
   * standard pipeline input for port 1
   * This is the data as produced by vtkComputeMoments or vtkMomentInvariants.
   */
  void SetMomentsConnection(vtkAlgorithmOutput* algOutput)
  {
    this->SetInputConnection(0, algOutput);
  };

  /**
   * standard pipeline input for port 1
   * This input steers the topology of the reconstructed field.
   */
  void SetGridData(vtkDataObject* input) { this->SetInputData(1, input); };

  /**
   * standard pipeline input for port 1
   * This input steers the topology of the reconstructed field.
   */
  void SetGridConnection(vtkAlgorithmOutput* algOutput) { this->SetInputConnection(1, algOutput); };

  //@{
  /**
   * Set/Get The reconstruction function returns zero if the point is outside the integration radius
   * of a vertex iff AllowExtrapolation is false
   */
  vtkSetMacro(AllowExtrapolation, bool);
  vtkGetMacro(AllowExtrapolation, bool);
  //@}

protected:
  /**
   * constructor setting defaults
   */
  vtkReconstructFromMoments();

  /**
   * destructor
   */
  ~vtkReconstructFromMoments() override;

  int RequestUpdateExtent(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;

  /** main executive of the program, reads the input, calles the functions, and produces the utput.
   * @param request: ?
   * @param inputVector: the input information
   * @param outputVector: the output information
   */
  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;

private:
  vtkReconstructFromMoments(const vtkReconstructFromMoments&) = delete;
  void operator=(const vtkReconstructFromMoments&) = delete;

  /**
   * the number of fields in the source
   * equals NumberOfBasisFunctions * numberOfRadii
   */
  size_t NumberOfFields;

  /**
   * the number of basis functions in the source
   * equals \sum_{i=0}^order dimension^o
   */
  size_t NumberOfBasisFunctions;

  /**
   * Dimension of the source can be 2 or 3
   */
  int Dimension;

  /**
   * Rank of the source is 0 for scalars, 1 for vectors, 3 for matrices
   */
  int FieldRank;

  /**
   * Maximal order up to which the moments are calculated
   */
  int Order;

  /**
   * Different integration radii in a vector
   */
  std::vector<double> Radii;

  /**
   * If false, reconstruction outside the integration radius is set to zero
   */
  bool AllowExtrapolation;

  /**
   * the agorithm has two input ports
   * port 0 is the moments Data, which is a vtkImageData and the 0th output of vtkMomentInvariants
   * port 1 a finer grid that is used for the drawing of the circles and balls
   */
  int FillInputPortInformation(int port, vtkInformation* info) override;

  /**
   * the agorithm generates 1 output of the topology of the gridData
   */
  int FillOutputPortInformation(int port, vtkInformation* info) override;

  /**
   * Make sure that the user has not entered weird values.
   * @param momentsData: the moments from which the reconstruction will be computed
   * @param gridData: the grid for the reconstruction
   */
  void CheckValidity(vtkImageData* momentsData, vtkDataSet* gridData);

  /**
   * Find out the dimension and the data type of the moments dataset.
   * @param momentsData: the moments from which the reconstruction will be computed
   */
  void InterpretGridData(vtkDataSet* gridData);

  /**
   * Find out the dimension and the data type of the moments dataset.
   * @param momentsData: the moments from which the reconstruction will be computed
   */
  void InterpretMomentsData(vtkImageData* momentsData);
};

#endif
