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// G4ParticleChangeForLoss
//
// Class description:
//
// Concrete class for ParticleChange for EnergyLoss.

// Author: Hisaya Kurashige, 23 March 1998  
// Revision: Vladimir Ivantchenko, 16 January 2004
//                                 24 August 2022
// --------------------------------------------------------------------
#ifndef G4ParticleChangeForLoss_hh
#define G4ParticleChangeForLoss_hh 1

#include "G4VParticleChange.hh"
#include "G4DynamicParticle.hh"

class G4ParticleChangeForLoss final : public G4VParticleChange
{
public:

  G4ParticleChangeForLoss();

  ~G4ParticleChangeForLoss() override = default;

  G4ParticleChangeForLoss(const G4ParticleChangeForLoss& right) = delete;
  G4ParticleChangeForLoss& operator=(const G4ParticleChangeForLoss& right) = delete;

  // --- the following methods are for updating G4Step -----

  G4Step* UpdateStepForAlongStep(G4Step* step) final;
  G4Step* UpdateStepForPostStep(G4Step* step) final;

  // Initialize all used properties 
  inline void InitializeForAlongStep(const G4Track&);
  inline void InitializeForPostStep(const G4Track&);

  // Get/Set dynamic charge
  inline G4double GetProposedCharge() const;
  inline void SetProposedCharge(G4double theCharge);

  // Get/Set the final kinetic energy of the current particle
  inline G4double GetProposedKineticEnergy() const;
  inline void SetProposedKineticEnergy(G4double proposedKinEnergy);

  // Get/Propose the MomentumDirection vector: it is the final momentum
  // direction
  inline const G4ThreeVector& GetProposedMomentumDirection() const;
  inline void SetProposedMomentumDirection(const G4ThreeVector& dir);
  inline void ProposeMomentumDirection(const G4ThreeVector& Pfinal);

  inline const G4ThreeVector& GetProposedPolarization() const;
  inline void ProposePolarization(const G4ThreeVector& dir);
  inline void ProposePolarization(G4double Px, G4double Py, G4double Pz);

  void DumpInfo() const final;

private:

  G4double proposedKinEnergy = 0.0;
  // The final kinetic energy of the current particle

  G4double currentCharge = 0.0;
      // The final charge of the current particle

  G4ThreeVector proposedMomentumDirection;
  // The final momentum direction of the current particle

  G4ThreeVector proposedPolarization;
  // The final polarization of the current particle
};

// ----------------------
// Inline methods
// ----------------------

inline
G4double G4ParticleChangeForLoss::GetProposedKineticEnergy() const
{
  return proposedKinEnergy;
}

inline
void G4ParticleChangeForLoss::SetProposedKineticEnergy(G4double energy)
{
  proposedKinEnergy = energy;
}

inline G4double G4ParticleChangeForLoss::GetProposedCharge() const
{
  return currentCharge;
}

inline
void G4ParticleChangeForLoss::SetProposedCharge(G4double theCharge)
{
  currentCharge = theCharge;
}

inline
const G4ThreeVector&
G4ParticleChangeForLoss::GetProposedMomentumDirection() const
{
  return proposedMomentumDirection;
}

inline
void G4ParticleChangeForLoss::ProposeMomentumDirection(const G4ThreeVector& dir)
{
  proposedMomentumDirection = dir;
}

inline
void
G4ParticleChangeForLoss::SetProposedMomentumDirection(const G4ThreeVector& dir)
{
  proposedMomentumDirection = dir;
}

inline
const G4ThreeVector& G4ParticleChangeForLoss::GetProposedPolarization() const
{
  return proposedPolarization;
}

inline
void G4ParticleChangeForLoss::ProposePolarization(const G4ThreeVector& dir)
{
  proposedPolarization = dir;
}

inline void G4ParticleChangeForLoss::ProposePolarization(G4double Px,
                                                         G4double Py,
                                                         G4double Pz)
{
  proposedPolarization.set(Px, Py, Pz);
}

inline
void G4ParticleChangeForLoss::InitializeForAlongStep(const G4Track& track)
{
  InitializeSecondaries();
  InitializeLocalEnergyDeposit();
  InitializeParentWeight(track);
  InitializeStatusChange(track);
  proposedKinEnergy = track.GetKineticEnergy();
  currentCharge = track.GetDynamicParticle()->GetCharge();
}

inline
void G4ParticleChangeForLoss::InitializeForPostStep(const G4Track& track)
{
  InitializeForAlongStep(track);
  proposedMomentumDirection = track.GetMomentumDirection();
  proposedPolarization = track.GetPolarization();
}

#endif