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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4MuonToMuonPairProduction
//
// Author:        Siddharth Yajaman on the base of Vladamir Ivantchenko/Laszlo Urban code
//
// Creation date: 12.07.2022
//
// Modifications:
//
//
// -------------------------------------------------------------------
//
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#include "G4MuonToMuonPairProduction.hh"
#include "G4SystemOfUnits.hh"
#include "G4MuonPlus.hh"
#include "G4VEmModel.hh"
#include "G4MuonToMuonPairProductionModel.hh"
#include "G4ElementData.hh"
#include "G4EmParameters.hh"

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G4MuonToMuonPairProduction::G4MuonToMuonPairProduction(const G4String& name)
  : G4MuPairProduction(name)
{
  SetProcessSubType(49);
  SetSecondaryParticle(G4MuonPlus::MuonPlus());
}

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void G4MuonToMuonPairProduction::InitialiseEnergyLossProcess(
                         const G4ParticleDefinition* part,
			 const G4ParticleDefinition*)
{
  if (isInitialised) { return; }
  isInitialised = true;

  theParticle = part;
  lowestKinEnergy = std::max(lowestKinEnergy, part->GetPDGMass()*8.0);

  G4VEmModel* mod = EmModel(0);
  if(nullptr == mod) {
    mod = new G4MuonToMuonPairProductionModel(part); 
    SetEmModel(mod);
  }

  G4VEmFluctuationModel* fm = nullptr;
  G4EmParameters* param = G4EmParameters::Instance();
  mod->SetLowEnergyLimit(param->MinKinEnergy());
  mod->SetHighEnergyLimit(param->MaxKinEnergy());
  mod->SetSecondaryThreshold(param->MuHadBremsstrahlungTh());
  AddEmModel(1, mod, fm);
}

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void G4MuonToMuonPairProduction::ProcessDescription(std::ostream& out) const
{
  out << "  Muon-anti-muon pair production by muons";
  G4MuPairProduction::ProcessDescription(out);
}

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