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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4eBremsstrahlung
//
// Author:        Michel Maire
//
// Creation date: 26.06.1996
//
// Modified by Michel Maire, Vladimir Ivanchenko, Andreas Schaelicke  
//
// -------------------------------------------------------------------
//
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#include "G4eBremsstrahlung.hh"
#include "G4SystemOfUnits.hh"
#include "G4Gamma.hh"
#include "G4SeltzerBergerModel.hh"
#include "G4eBremsstrahlungRelModel.hh"
#include "G4UnitsTable.hh"
#include "G4LossTableManager.hh"

#include "G4ProductionCutsTable.hh"
#include "G4MaterialCutsCouple.hh"
#include "G4EmParameters.hh"

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using namespace std;
 
G4eBremsstrahlung::G4eBremsstrahlung(const G4String& name):
  G4VEnergyLossProcess(name), 
  isInitialised(false)
{
  SetProcessSubType(fBremsstrahlung);
  SetSecondaryParticle(G4Gamma::Gamma());
  SetIonisation(false);
}

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G4eBremsstrahlung::~G4eBremsstrahlung()
{}

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G4bool G4eBremsstrahlung::IsApplicable(const G4ParticleDefinition& p)
{
  return (&p == G4Electron::Electron() || &p == G4Positron::Positron());
}

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void 
G4eBremsstrahlung::InitialiseEnergyLossProcess(const G4ParticleDefinition*,
					       const G4ParticleDefinition*)
{
  if(!isInitialised) {
    G4EmParameters* param = G4EmParameters::Instance();

    G4double emin = param->MinKinEnergy();
    G4double emax = param->MaxKinEnergy();
    G4VEmFluctuationModel* fm = nullptr;

    if (!EmModel(0)) { SetEmModel(new G4SeltzerBergerModel()); }
    EmModel(0)->SetLowEnergyLimit(emin);
    G4double energyLimit = std::min(EmModel(0)->HighEnergyLimit(), GeV);
    EmModel(0)->SetHighEnergyLimit(energyLimit);
    EmModel(0)->SetSecondaryThreshold(param->BremsstrahlungTh());
    EmModel(0)->SetLPMFlag(false);
    AddEmModel(1, EmModel(0), fm);

    if(emax > energyLimit) {
      if (!EmModel(1)) { SetEmModel(new G4eBremsstrahlungRelModel()); }
      EmModel(1)->SetLowEnergyLimit(energyLimit);
      EmModel(1)->SetHighEnergyLimit(emax); 
      EmModel(1)->SetSecondaryThreshold(param->BremsstrahlungTh());
      EmModel(1)->SetLPMFlag(param->LPM());
      AddEmModel(1, EmModel(1), fm);
    }
    isInitialised = true;
  }
}

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void G4eBremsstrahlung::StreamProcessInfo(std::ostream& out) const
{
  if(EmModel(0)) {
    G4EmParameters* param = G4EmParameters::Instance();
    G4double eth = param->BremsstrahlungTh(); 
    out << "      LPM flag: " << param->LPM() << " for E > " 
	<< EmModel(0)->HighEnergyLimit()/GeV << " GeV";
    if(eth < DBL_MAX) { 
      out << ",  VertexHighEnergyTh(GeV)= " << eth/GeV; 
    }
    out << G4endl;
  }
}

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void G4eBremsstrahlung::ProcessDescription(std::ostream& out) const
{
  out << "  Bremsstrahlung";
  G4VEnergyLossProcess::ProcessDescription(out);
}

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