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

  Program:   Visualization Toolkit
  Module:    vtkGenerateTimeSteps.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   vtkGenerateTimeSteps
 * @brief   Generate timesteps on any input
 *
 * A vtkPassInputTypeAlgorithm that add timesteps during the request information
 * pass and just shallow copy its input to its output. Input timesteps are completely
 * ignored and the first timestep will be requested if any.
 */

#ifndef vtkGenerateTimeSteps_h
#define vtkGenerateTimeSteps_h

#include "vtkFiltersHybridModule.h" // for export macro
#include "vtkPassInputTypeAlgorithm.h"

#include <vector> // for time steps

class VTKFILTERSHYBRID_EXPORT vtkGenerateTimeSteps : public vtkPassInputTypeAlgorithm
{
public:
  vtkTypeMacro(vtkGenerateTimeSteps, vtkPassInputTypeAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static vtkGenerateTimeSteps* New();

  /**
   * Get the number of time steps that will be extracted
   */
  int GetNumberOfTimeSteps() const { return static_cast<int>(this->TimeStepValues.size()); }

  /**
   * Add a time step value.
   */
  void AddTimeStepValue(double timeStepValue);

  ///@{
  /**
   * Get/Set an array of time step values. For the Get function,
   * timeStepValues should be big enough for GetNumberOfTimeSteps() values.
   */
  void SetTimeStepValues(int count, const double* timeStepValues);
  void GetTimeStepValues(double* timeStepValues) const;
  ///@}

  /**
   * Generate a range of values in [begin, end) with a step size of 'step'
   */
  void GenerateTimeStepValues(double begin, double end, double step);

  ///@{
  /**
   * Clear the time step values
   */
  void ClearTimeStepValues()
  {
    this->TimeStepValues.clear();
    this->Modified();
  }
  ///@}

protected:
  vtkGenerateTimeSteps() = default;
  ~vtkGenerateTimeSteps() override = default;

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

  std::vector<double> TimeStepValues;

private:
  vtkGenerateTimeSteps(const vtkGenerateTimeSteps&) = delete;
  void operator=(const vtkGenerateTimeSteps&) = delete;
};

#endif // vtkGenerateTimeSteps_h