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//
//
//
//
//---------------------------------------------------------------
//
//  G4ScoreSplittingProcess.hh
//
//  Description:
//    This process is used to split the length and energy
//   of a step in a regular structure into sub-steps, and to
//   call the scorers for each sub-volume.
//    It invokes sensitive detectors assigned in the *mass*
//   world.
//
//  Design and first implementation: J. Apostolakis / M.Asai 2010
//---------------------------------------------------------------

#ifndef G4ScoreSplittingProcess_h
#define G4ScoreSplittingProcess_h 1

#include "G4FieldTrack.hh"
#include "G4TouchableHandle.hh"
#include "G4VProcess.hh"
#include "globals.hh"
class G4Step;
class G4Navigator;
class G4TransportationManager;
class G4PathFinder;
class G4VTouchable;
class G4VPhysicalVolume;
class G4ParticleChange;
class G4EnergySplitter;

class G4TouchableHistory;

//------------------------------------------
//
//        G4ScoreSplittingProcess class
//
//------------------------------------------

// Class Description:

class G4ScoreSplittingProcess : public G4VProcess
{
  public:  // with description
    //------------------------
    // Constructor/Destructor
    //------------------------

    G4ScoreSplittingProcess(const G4String& processName = "ScoreSplittingProc",
                            G4ProcessType theType = fParameterisation);
    ~G4ScoreSplittingProcess() override;

    //--------------------------------------------------------------
    //     Process interface
    //--------------------------------------------------------------

    void StartTracking(G4Track*) override;

    //------------------------------------------------------------------------
    // GetPhysicalInteractionLength() and DoIt() methods for AtRest
    //------------------------------------------------------------------------

    G4double AtRestGetPhysicalInteractionLength(const G4Track&, G4ForceCondition*) override;

    G4VParticleChange* AtRestDoIt(const G4Track&, const G4Step&) override;

    //------------------------------------------------------------------------
    // GetPhysicalInteractionLength() and DoIt() methods for AlongStep
    //------------------------------------------------------------------------

    G4double AlongStepGetPhysicalInteractionLength(const G4Track&, G4double, G4double, G4double&,
                                                   G4GPILSelection*) override;

    G4VParticleChange* AlongStepDoIt(const G4Track&, const G4Step&) override;

    //-----------------------------------------------------------------------
    // GetPhysicalInteractionLength() and DoIt() methods for PostStep
    //-----------------------------------------------------------------------

    G4double PostStepGetPhysicalInteractionLength(const G4Track& track, G4double previousStepSize,
                                                  G4ForceCondition* condition) override;

    G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&) override;

  private:
    G4TouchableHistory* CreateTouchableForSubStep(G4int newVoxelNum, G4ThreeVector newPosition);

  private:
    void CopyStepStart(const G4Step& step);

    G4Step* fSplitStep;
    G4StepPoint* fSplitPreStepPoint;
    G4StepPoint* fSplitPostStepPoint;

    G4VParticleChange dummyParticleChange;
    G4ParticleChange xParticleChange;

    // G4TransportationManager* fTransportationManager;
    // G4PathFinder*        fPathFinder;

    // -------------------------------
    // Touchables for the Split Step
    // -------------------------------
    G4TouchableHandle fOldTouchableH;
    G4TouchableHandle fNewTouchableH;

    // Memory of Touchables of full step
    G4TouchableHandle fInitialTouchableH;
    G4TouchableHandle fFinalTouchableH;

    G4EnergySplitter* fpEnergySplitter;

    // ******************************************************
    //  For TESTS:
    // ******************************************************
  public:
    void Verbose(const G4Step&) const;
};

#endif