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

  Program:   Visualization Toolkit
  Module:    vtkStreamTracer.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.

=========================================================================*/
#ifndef vtkStreamTracer_h
#define vtkStreamTracer_h

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

#include "vtkInitialValueProblemSolver.h" // Needed for constants

class vtkCompositeDataSet;
class vtkDataArray;
class vtkDoubleArray;
class vtkExecutive;
class vtkGenericCell;
class vtkIdList;
class vtkIntArray;
class vtkAbstractInterpolatedVelocityField;

class VTKFILTERSFLOWPATHS_EXPORT vtkStreamTracer : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkStreamTracer,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkStreamTracer *New();


  vtkSetVector3Macro(StartPosition, double);
  vtkGetVector3Macro(StartPosition, double);


  void SetSourceData(vtkDataSet *source);
  vtkDataSet *GetSource();

  void SetSourceConnection(vtkAlgorithmOutput* algOutput);

//BTX
  // The previously-supported TIME_UNIT is excluded in this current
  // enumeration definition because the underlying step size is ALWAYS in
  // arc length unit (LENGTH_UNIT) while the 'real' time interval (virtual
  // for steady flows) that a particle actually takes to trave in a single
  // step is obtained by dividing the arc length by the LOCAL speed. The
  // overall elapsed time (i.e., the life span) of the particle is the sum
  // of those individual step-wise time intervals. The arc-length-to-time
  // conversion only occurs for vorticity computation and for generating a
  // point data array named 'IntegrationTime'.
  enum Units
  {
    LENGTH_UNIT = 1,
    CELL_LENGTH_UNIT = 2
  };

  enum Solvers
  {
    RUNGE_KUTTA2,
    RUNGE_KUTTA4,
    RUNGE_KUTTA45,
    NONE,
    UNKNOWN
  };

  enum ReasonForTermination
  {
    OUT_OF_DOMAIN = vtkInitialValueProblemSolver::OUT_OF_DOMAIN,
    NOT_INITIALIZED = vtkInitialValueProblemSolver::NOT_INITIALIZED ,
    UNEXPECTED_VALUE = vtkInitialValueProblemSolver::UNEXPECTED_VALUE,
    OUT_OF_LENGTH = 4,
    OUT_OF_STEPS = 5,
    STAGNATION = 6
  };
//ETX


  void SetIntegrator(vtkInitialValueProblemSolver *);
  vtkGetObjectMacro ( Integrator, vtkInitialValueProblemSolver );
  void SetIntegratorType(int type);
  int GetIntegratorType();
  void SetIntegratorTypeToRungeKutta2()
    {this->SetIntegratorType(RUNGE_KUTTA2);};
  void SetIntegratorTypeToRungeKutta4()
    {this->SetIntegratorType(RUNGE_KUTTA4);};
  void SetIntegratorTypeToRungeKutta45()
    {this->SetIntegratorType(RUNGE_KUTTA45);};

  void SetInterpolatorTypeToDataSetPointLocator();

  void SetInterpolatorTypeToCellLocator();


  vtkSetMacro(MaximumPropagation, double);
  vtkGetMacro(MaximumPropagation, double);


  void SetIntegrationStepUnit( int unit );
  int  GetIntegrationStepUnit() { return this->IntegrationStepUnit; }


  vtkSetMacro(InitialIntegrationStep, double);
  vtkGetMacro(InitialIntegrationStep, double);


  vtkSetMacro(MinimumIntegrationStep, double);
  vtkGetMacro(MinimumIntegrationStep, double);


  vtkSetMacro(MaximumIntegrationStep, double);
  vtkGetMacro(MaximumIntegrationStep, double);


  vtkSetMacro(MaximumError, double);
  vtkGetMacro(MaximumError, double);


  vtkSetMacro(MaximumNumberOfSteps, vtkIdType);
  vtkGetMacro(MaximumNumberOfSteps, vtkIdType);


  vtkSetMacro(TerminalSpeed, double);
  vtkGetMacro(TerminalSpeed, double);

//BTX
  enum
  {
    FORWARD,
    BACKWARD,
    BOTH
  };

  enum
  {
    INTERPOLATOR_WITH_DATASET_POINT_LOCATOR,
    INTERPOLATOR_WITH_CELL_LOCATOR
  };
//ETX


  vtkSetClampMacro(IntegrationDirection, int, FORWARD, BOTH);
  vtkGetMacro(IntegrationDirection, int);
  void SetIntegrationDirectionToForward()
    {this->SetIntegrationDirection(FORWARD);};
  void SetIntegrationDirectionToBackward()
    {this->SetIntegrationDirection(BACKWARD);};
  void SetIntegrationDirectionToBoth()
    {this->SetIntegrationDirection(BOTH);};


  vtkSetMacro(ComputeVorticity, bool);
  vtkGetMacro(ComputeVorticity, bool);


  vtkSetMacro(RotationScale, double);
  vtkGetMacro(RotationScale, double);

  void SetInterpolatorPrototype( vtkAbstractInterpolatedVelocityField * ivf );

  void SetInterpolatorType( int interpType );

protected:

  vtkStreamTracer();
  ~vtkStreamTracer();

  // Create a default executive.
  virtual vtkExecutive* CreateDefaultExecutive();

  // hide the superclass' AddInput() from the user and the compiler
  void AddInput(vtkDataObject *)
    { vtkErrorMacro( << "AddInput() must be called with a vtkDataSet not a vtkDataObject."); };

  virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
  virtual int FillInputPortInformation(int, vtkInformation *);

  void CalculateVorticity( vtkGenericCell* cell, double pcoords[3],
                           vtkDoubleArray* cellVectors, double vorticity[3] );
  void Integrate(vtkPointData *inputData,
                 vtkPolyData* output,
                 vtkDataArray* seedSource,
                 vtkIdList* seedIds,
                 vtkIntArray* integrationDirections,
                 double lastPoint[3],
                 vtkAbstractInterpolatedVelocityField* func,
                 int maxCellSize,
                 int vecType,
                 const char *vecFieldName,
                 double& propagation,
                 vtkIdType& numSteps);
  void SimpleIntegrate(double seed[3],
                       double lastPoint[3],
                       double stepSize,
                       vtkAbstractInterpolatedVelocityField* func);
  int CheckInputs(vtkAbstractInterpolatedVelocityField*& func,
                  int* maxCellSize);
  void GenerateNormals(vtkPolyData* output, double* firstNormal, const char *vecName);

  bool GenerateNormalsInIntegrate;

  // starting from global x-y-z position
  double StartPosition[3];

  static const double EPSILON;
  double TerminalSpeed;

  double LastUsedStepSize;

//BTX
  struct IntervalInformation
  {
    double Interval;
    int Unit;
  };

  double MaximumPropagation;
  double MinimumIntegrationStep;
  double MaximumIntegrationStep;
  double InitialIntegrationStep;

  void ConvertIntervals( double& step, double& minStep, double& maxStep,
                        int direction, double cellLength );
  static double ConvertToLength( double interval, int unit, double cellLength );
  static double ConvertToLength( IntervalInformation& interval, double cellLength );

//ETX

  int SetupOutput(vtkInformation* inInfo,
                  vtkInformation* outInfo);
  void InitializeSeeds(vtkDataArray*& seeds,
                       vtkIdList*& seedIds,
                       vtkIntArray*& integrationDirections,
                       vtkDataSet *source);

  int IntegrationStepUnit;
  int IntegrationDirection;

  // Prototype showing the integrator type to be set by the user.
  vtkInitialValueProblemSolver* Integrator;

  double MaximumError;
  vtkIdType MaximumNumberOfSteps;

  bool ComputeVorticity;
  double RotationScale;

  vtkAbstractInterpolatedVelocityField * InterpolatorPrototype;

  vtkCompositeDataSet* InputData;
  bool HasMatchingPointAttributes; //does the point data in the multiblocks have the same attributes?

  friend class PStreamTracerUtils;

private:
  vtkStreamTracer(const vtkStreamTracer&);  // Not implemented.
  void operator=(const vtkStreamTracer&);  // Not implemented.
};


#endif