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// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4AtimaFluctuations
//
// Author:        Jose Luis Rodriguez Sanchez on base of ATIMA code
//
// Creation date: 16.01.2018
//
// Modifications:
//
//
// Class Description:
//
// Implementation of ion energy loss fluctuations
//
// -------------------------------------------------------------------
//

#ifndef G4AtimaFluctuations_h
#define G4AtimaFluctuations_h 1


#include "G4VEmFluctuationModel.hh"
#include "G4ParticleDefinition.hh"
#include "G4UniversalFluctuation.hh"

class G4Pow;

class G4AtimaFluctuations : public G4VEmFluctuationModel
{

public:

  explicit G4AtimaFluctuations(const G4String& nam = "IonFlucAtima");

  ~G4AtimaFluctuations() override;

  // Sample fluctuations
  G4double SampleFluctuations(const G4MaterialCutsCouple*,
			      const G4DynamicParticle*,
			      const G4double tcut,
			      const G4double tmax,
			      const G4double length,
			      const G4double meanLoss) override;

  // Compute dispertion 
  G4double Dispersion(const G4Material*,
		      const G4DynamicParticle*,
		      const G4double tcut,
		      const G4double tmax,
		      const G4double length) override;

  // Initialisation prerun
  void InitialiseMe(const G4ParticleDefinition*) override;

  // Initialisation prestep
  void SetParticleAndCharge(const G4ParticleDefinition*, 
			    G4double q2) override;

  // hide assignment operator
  G4AtimaFluctuations & operator=(const  G4AtimaFluctuations &right) = delete;
  G4AtimaFluctuations(const  G4AtimaFluctuations&) = delete;

private:

  G4double EnergyTable_interpolate(const G4double* table,G4double xval, const G4double* y);

  const G4ParticleDefinition* particle;

  G4Pow*   g4calc; 

  G4double particleMass;
  G4double charge;
  G4double chargeSquare;
  G4double effChargeSquare;

  G4double MLN10;
  G4double atomic_mass_unit;
  G4double dedx_constant;
  G4double electron_mass;
  G4double fine_structure;
  G4double domega2dx_constant;

  static G4double stepE;
  static G4double tableE[200];
  static const G4double ls_X_coefficients_a[110][200];
  static const G4double ls_X_coefficients_ahi[110][200];
  static const G4double element_atomic_weights[110];

  // data members to speed up the fluctuation calculation
  G4double minLoss;
  // cash
  G4double kineticEnergy;
  G4double beta2;
};

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

#endif