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// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4eeToHadronsMultiModel
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 18.05.2005
//
// Modifications:
//

//
// Class Description: vector of e+e- -> hadrons models
//

// -------------------------------------------------------------------
//

#ifndef G4eeToHadronsMultiModel_h
#define G4eeToHadronsMultiModel_h 1

#include "G4VEmModel.hh"
#include "G4eeToHadronsModel.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4TrackStatus.hh"
#include "Randomize.hh"
#include <CLHEP/Units/SystemOfUnits.h>
#include <CLHEP/Units/PhysicalConstants.h>
#include <vector>

class G4eeCrossSections;
class G4Vee2hadrons;

class G4eeToHadronsMultiModel : public G4VEmModel
{

public:

  explicit G4eeToHadronsMultiModel(G4int ver=0, 
                                   const G4String& nam = "eeToHadrons");

  virtual ~G4eeToHadronsMultiModel();

  virtual void Initialise(const G4ParticleDefinition*, 
                          const G4DataVector&) override;

  virtual G4double CrossSectionPerVolume(const G4Material*,
					 const G4ParticleDefinition*,
					 G4double kineticEnergy,
					 G4double cutEnergy,
					 G4double maxEnergy) override;

  virtual G4double ComputeCrossSectionPerAtom(
                                     const G4ParticleDefinition*,
                                     G4double kineticEnergy,
                                     G4double Z, G4double A,
                                     G4double cutEnergy = 0.0,
                                     G4double maxEnergy = DBL_MAX) override;

  virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
				 const G4MaterialCutsCouple*,
				 const G4DynamicParticle*,
				 G4double tmin = 0.0,
				 G4double maxEnergy = DBL_MAX) override;

  virtual void ModelDescription(std::ostream& outFile) const override;
  
  // Set the factor to artificially increase the crossSection (default 1)
  void SetCrossSecFactor(G4double fac);

  inline G4double ComputeCrossSectionPerElectron(
                                         const G4ParticleDefinition*,
                                         G4double kineticEnergy,
                                         G4double cutEnergy = 0.0,
                                         G4double maxEnergy = DBL_MAX);

private:

  void AddEEModel(G4Vee2hadrons*, const G4DataVector&);

  //change incident e+ kinetic energy into CM total energy(sum of e+ and e-)  
  inline G4double LabToCM(G4double);

  // hide assignment operator
  G4eeToHadronsMultiModel & operator=(const  G4eeToHadronsMultiModel &right);
  G4eeToHadronsMultiModel(const  G4eeToHadronsMultiModel&);

  G4eeCrossSections*               cross;
  G4ParticleChangeForGamma*        fParticleChange;
  G4double 			   delta;  

  std::vector<G4eeToHadronsModel*> models;

  std::vector<G4double>            ekinMin;
  std::vector<G4double>            ekinPeak;
  std::vector<G4double>            ekinMax;
  std::vector<G4double>            cumSum;

  G4double                         thKineticEnergy;
  G4double                         maxKineticEnergy;
  G4double                         csFactor;

  G4int                            nModels;
  G4int                            verbose;
  G4bool                           isInitialised;
};

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

//change incident e+ kinetic energy into CM total energy(sum of e+ and e-)  
inline G4double G4eeToHadronsMultiModel::LabToCM(G4double kinE_lab)
{
  G4double totE_CM = 0.0;
  G4double mass = CLHEP::electron_mass_c2;
  G4double totE_lab = kinE_lab + mass;
  totE_CM = std::sqrt(2*mass*(mass+totE_lab));

  return totE_CM;
}

inline G4double G4eeToHadronsMultiModel::ComputeCrossSectionPerElectron(
                                      const G4ParticleDefinition*,
				      G4double kineticEnergy,
				      G4double, G4double)
{
  G4double res = 0.0;

  G4double energy = LabToCM(kineticEnergy);

  if (energy > thKineticEnergy) {
    for(G4int i=0; i<nModels; i++) {
      if(energy >= ekinMin[i] && energy <= ekinMax[i]){
        res += (models[i])->ComputeCrossSectionPerElectron(0,energy);
      }
      cumSum[i] = res;
    }
  }
  return res*csFactor;
}

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

#endif
