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// G4GeometryCellStep
//
// Class description:
//
// This class serves to address the "cell" a track previously touched
// and a "cell" a track is currently in. It is used for scoring and
// importance sampling in the "mass" geometry as well as in a "parallel"
// geometry. 
// The "cell" information is available with the GetPreGeometryCell() and 
// the GetPostGeometryCell() functions.
// The GetCrossBoundary() function returns true in case the step
// crosses a boundary in the geometry this G4GeometryCellStep 
// refers to.

// Author: Michael Dressel (CERN), 2002
// ----------------------------------------------------------------------
#ifndef G4GEOMETRYCELLSTEP_HH
#define G4GEOMETRYCELLSTEP_HH

#include "G4GeometryCell.hh"

/**
 * @brief G4GeometryCellStep serves to address the "cell" a track previously
 * touched and a "cell" a track is currently in. It is used for scoring and
 * importance sampling in the "mass" geometry as well as in a "parallel"
 * geometry.
 */

class G4GeometryCellStep
{
  public:

    /**
     * Constructor. Initialises pre and post G4GeometryCell.
     *  @param[in] preCell The previous cell.
     *  @param[in] postCell The next cell.
     */
    G4GeometryCellStep(const G4GeometryCell& preCell, 
                       const G4GeometryCell& postCell);

    /**
     * Default Destructor.
     */
    ~G4GeometryCellStep() = default;

    /**
     * Returns the "cell" the track previously touched.
     */
    inline const G4GeometryCell& GetPreGeometryCell() const; 

    /**
     * Returns the current "cell".
     */
    inline const G4GeometryCell& GetPostGeometryCell() const; 

    /**
     * Returns true if the step crosses boundary of the geometry it refers to.
     */
    inline G4bool GetCrossBoundary() const; 

    /**
     * Functions used by the scoring and importance system to set the cell
     * information.
     */
    inline void SetPreGeometryCell(const G4GeometryCell& preCell); 
    inline void SetPostGeometryCell(const G4GeometryCell& postCell);
    inline void SetCrossBoundary(G4bool b);

  private:

    G4GeometryCell fPreGeometryCell;
    G4GeometryCell fPostGeometryCell;  
    G4bool fCrossBoundary = false;
};

// Inline methods

inline void
G4GeometryCellStep::SetPreGeometryCell(const G4GeometryCell& preCell) 
{
  fPreGeometryCell = preCell;
}

inline void
G4GeometryCellStep::SetPostGeometryCell(const G4GeometryCell& postCell)  
{
  fPostGeometryCell = postCell;
}
  
inline void
G4GeometryCellStep::SetCrossBoundary(G4bool b) 
{
  fCrossBoundary = b;
}

inline const G4GeometryCell&
G4GeometryCellStep::GetPreGeometryCell() const 
{
  return fPreGeometryCell;
}

inline const G4GeometryCell&
G4GeometryCellStep::GetPostGeometryCell() const 
{
  return fPostGeometryCell;
}
  
inline G4bool
G4GeometryCellStep::GetCrossBoundary() const 
{
  return fCrossBoundary;
}

#endif
