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

  Program:   Visualization Toolkit
  Module:    vtkParticlePathFilter.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   vtkParticlePathFilter
 * @brief   A Parallel Particle tracer for unsteady vector fields
 *
 * vtkParticlePathFilter is a filter that integrates a vector field to generate particle paths
 *
 *
 * @sa
 * vtkParticlePathFilterBase has the details of the algorithms
 */

#ifndef vtkParticlePathFilter_h
#define vtkParticlePathFilter_h

#include "vtkFiltersFlowPathsModule.h" // For export macro
#include "vtkParticleTracerBase.h"
#include "vtkSmartPointer.h" // For protected ivars.
#include <vector>            // For protected ivars

class VTKFILTERSFLOWPATHS_EXPORT ParticlePathFilterInternal
{
public:
  ParticlePathFilterInternal()
    : Filter(nullptr)
  {
  }
  void Initialize(vtkParticleTracerBase* filter);
  virtual ~ParticlePathFilterInternal() = default;
  virtual int OutputParticles(vtkPolyData* particles);
  void SetClearCache(bool clearCache) { this->ClearCache = clearCache; }
  bool GetClearCache() { return this->ClearCache; }
  void Finalize();
  void Reset();

private:
  vtkParticleTracerBase* Filter;
  // Paths doesn't seem to work properly. it is meant to make connecting lines
  // for the particles
  std::vector<vtkSmartPointer<vtkIdList>> Paths;
  bool ClearCache; // false by default
};

class VTKFILTERSFLOWPATHS_EXPORT vtkParticlePathFilter : public vtkParticleTracerBase
{
public:
  vtkTypeMacro(vtkParticlePathFilter, vtkParticleTracerBase);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static vtkParticlePathFilter* New();

protected:
  vtkParticlePathFilter();
  ~vtkParticlePathFilter() override;
  vtkParticlePathFilter(const vtkParticlePathFilter&) = delete;
  void operator=(const vtkParticlePathFilter&) = delete;

  void ResetCache() override;
  int OutputParticles(vtkPolyData* particles) override;
  void InitializeExtraPointDataArrays(vtkPointData* outputPD) override;
  void AppendToExtraPointDataArrays(vtkParticleTracerBaseNamespace::ParticleInformation&) override;

  void Finalize() override;

  //
  // Store any information we need in the output and fetch what we can
  // from the input
  //
  int RequestInformation(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override;

  ParticlePathFilterInternal It;

private:
  vtkDoubleArray* SimulationTime;
  vtkIntArray* SimulationTimeStep;
};

#endif
