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/// \file hadronic/Hadr03/src/GammaNuclearPhysics.cc
/// \brief Implementation of the GammaNuclearPhysics class
//
//

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#include "GammaNuclearPhysics.hh"

#include "G4ParticleDefinition.hh"
#include "G4ProcessManager.hh"

// Processes

#include "G4CascadeInterface.hh"
#include "G4HadronInelasticProcess.hh"
#include "G4LowEGammaNuclearModel.hh"
#include "G4PhotoNuclearCrossSection.hh"
#include "G4SystemOfUnits.hh"

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GammaNuclearPhysics::GammaNuclearPhysics(const G4String& name) : G4VPhysicsConstructor(name) {}

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void GammaNuclearPhysics::ConstructProcess()
{
  G4HadronInelasticProcess* process =
    new G4HadronInelasticProcess("photonNuclear", G4Gamma::Definition());
  process->AddDataSet(new G4PhotoNuclearCrossSection);

  // to not register a model, set Emax=0; eg. Emax1 = 0.
  const G4double Emax1 = 200 * MeV, Emax2 = 10 * GeV;

  if (Emax1 > 0.) {  // model 1
    G4LowEGammaNuclearModel* model1 = new G4LowEGammaNuclearModel();
    model1->SetMaxEnergy(Emax1);
    process->RegisterMe(model1);
  }

  if (Emax2 > 0.) {  // model 2
    G4CascadeInterface* model2 = new G4CascadeInterface();
    G4double Emin2 = std::max(Emax1 - 1 * MeV, 0.);
    model2->SetMinEnergy(Emin2);
    model2->SetMaxEnergy(Emax2);
    process->RegisterMe(model2);
  }

  G4ProcessManager* pManager = G4Gamma::Gamma()->GetProcessManager();
  pManager->AddDiscreteProcess(process);
}

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