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// G4TransportationWithMsc
//
// Class Description:
//
// It is a generic process of transportation with multiple scattering included
// in the step limitation and propagation.
//
// Original author: Jonas Hahnfeld, 2022

#ifndef G4TrasportationWithMsc_h
#define G4TrasportationWithMsc_h 1

#include "G4Transportation.hh"

#include <vector>

class G4DataVector;
class G4EmDataHandler;
class G4EmModelManager;
class G4LossTableManager;
class G4ParticleChangeForGamma;
class G4ParticleChangeForMSC;
class G4ParticleDefinition;
class G4PhysicsTable;
class G4Region;
class G4VEmModel;
class G4VEnergyLossProcess;
class G4VMscModel;

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

class G4TransportationWithMsc : public G4Transportation
{
  public:
    enum class ScatteringType
    {
      MultipleScattering,
      SingleScattering,
    };

    explicit G4TransportationWithMsc(ScatteringType type, G4int verbosity = 0);

    ~G4TransportationWithMsc() override;

    inline void SetMultipleSteps(G4bool val);
    inline G4bool MultipleSteps() const;

    void AddMscModel(G4VMscModel* mscModel, G4int order = 0, const G4Region* region = nullptr);

    void AddSSModel(G4VEmModel* model, G4int order = 0, const G4Region* region = nullptr);

  public:
    void PreparePhysicsTable(const G4ParticleDefinition& part) override;
    void BuildPhysicsTable(const G4ParticleDefinition& part) override;

    void StartTracking(G4Track* track) override;

    G4double AlongStepGetPhysicalInteractionLength(const G4Track& track, G4double previousStepSize,
                                                   G4double currentMinimumStep,
                                                   G4double& proposedSafety,
                                                   G4GPILSelection* selection) override;

  private:
    const ScatteringType fType;
    G4bool fMultipleSteps = false;

    G4LossTableManager* fEmManager;
    G4EmModelManager* fModelManager;

    // Not initialized in the constructor, but later in PreparePhysicsTable or StartTracking.
    const G4DataVector* fCuts = nullptr;
    const G4ParticleDefinition* fFirstParticle = nullptr;
    G4VEnergyLossProcess* fIonisation = nullptr;

    // For ScatteringType::MultipleScattering
    G4ParticleChangeForMSC* fParticleChangeForMSC = nullptr;

    // For ScatteringType::SingleScattering
    G4EmDataHandler* fEmData = nullptr;
    G4PhysicsTable* fLambdaTable = nullptr;
    G4ParticleChangeForGamma* fParticleChangeForSS = nullptr;
    std::vector<G4DynamicParticle*>* fSecondariesSS = nullptr;

    G4DynamicParticle* fSubStepDynamicParticle;
    G4Track* fSubStepTrack;
    G4Step* fSubStep;
};

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

inline void G4TransportationWithMsc::SetMultipleSteps(G4bool val)
{
  fMultipleSteps = val;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

inline G4bool G4TransportationWithMsc::MultipleSteps() const
{
  return fMultipleSteps;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

#endif