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// Authors: S. Guatelli and M. G. Pia, INFN Genova, Italy
// 
// Based on code developed by the undergraduate student G. Guerrieri 
// Note: this is a preliminary beta-version of the code; an improved 
// version will be distributed in the next Geant4 public release, compliant
// with the design in a forthcoming publication, and subject to a 
// design and code review.

#include "G4HumanPhantomPhysicsList.hh"

#include "G4ParticleDefinition.hh"
#include "G4ProductionCutsTable.hh"
#include "G4ProcessManager.hh"
#include "G4ParticleTypes.hh"
#include "G4UnitsTable.hh"
#include "G4ios.hh"              

#include "G4MultipleScattering.hh"
// gamma
#include "G4LowEnergyRayleigh.hh" 
#include "G4LowEnergyPhotoElectric.hh"
#include "G4LowEnergyCompton.hh"  
#include "G4LowEnergyGammaConversion.hh" 
// e-
#include "G4LowEnergyIonisation.hh" 
#include "G4LowEnergyBremsstrahlung.hh" 
// e+
#include "G4eIonisation.hh" 
#include "G4eBremsstrahlung.hh" 
#include "G4eplusAnnihilation.hh"

G4HumanPhantomPhysicsList::G4HumanPhantomPhysicsList():  G4VUserPhysicsList()
{
  SetVerboseLevel(1);
}

G4HumanPhantomPhysicsList::~G4HumanPhantomPhysicsList()
{
}

void G4HumanPhantomPhysicsList::ConstructParticle()
{
  // In this method, static member functions should be called
  // for all particles which you want to use.
  // This ensures that objects of these particle types will be
  // created in the program. 
  G4Geantino::GeantinoDefinition();

  ConstructBosons();
  ConstructLeptons();
}

void G4HumanPhantomPhysicsList::ConstructBosons()
{ 
  // photons
  G4Gamma::GammaDefinition();
}

void G4HumanPhantomPhysicsList::ConstructLeptons()
{
  // leptons
  G4Electron::ElectronDefinition();
  G4Positron::PositronDefinition();
}

void G4HumanPhantomPhysicsList::ConstructProcess()
{
  AddTransportation();
  ConstructEM();
}

void G4HumanPhantomPhysicsList::ConstructEM()
{
  theParticleIterator->reset();

  while( (*theParticleIterator)() ){

    G4ParticleDefinition* particle = theParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();
    G4String particleName = particle->GetParticleName();
    
    // Processes
    
    if (particleName == "gamma") {
      // Photon     
      pmanager->AddDiscreteProcess(new G4LowEnergyRayleigh);
      pmanager->AddDiscreteProcess(new G4LowEnergyPhotoElectric);
      pmanager->AddDiscreteProcess(new G4LowEnergyCompton);
      pmanager->AddDiscreteProcess(new G4LowEnergyGammaConversion);
      
    } else if (particleName == "e-") {
      // Electron
      G4LowEnergyIonisation*	 loweIon  = new G4LowEnergyIonisation("LowEnergyIoni");

      G4LowEnergyBremsstrahlung* loweBrem = new G4LowEnergyBremsstrahlung("LowEnBrem");
      // Select the Bremsstrahlung angular distribution model (Tsai/2BN/2BS)
      loweBrem->SetAngularGenerator("tsai");
    
      pmanager->AddProcess(new G4MultipleScattering, -1, 1,1);
      pmanager->AddProcess(loweIon,     -1, 2,2);
      pmanager->AddProcess(loweBrem,    -1,-1,3);      
      
    } else if (particleName == "e+") {
      // Positron      
      pmanager->AddProcess(new G4MultipleScattering, -1, 1,1);
      pmanager->AddProcess(new G4eIonisation,        -1, 2,2);
      pmanager->AddProcess(new G4eBremsstrahlung,    -1,-1,3);
      pmanager->AddProcess(new G4eplusAnnihilation,   0,-1,4);      
      
    }
  }  
}

void G4HumanPhantomPhysicsList::SetCuts()
{
  // The production threshold is fixed to 0.1 mm for all the particles
  // Secondary particles with a range bigger than 0.1 mm 
  // are generated; otherwise their energy is considered deposited locally

  defaultCutValue = 0.1 * mm;

  const G4double cutForGamma = defaultCutValue;
  const G4double cutForElectron = defaultCutValue;
  const G4double cutForPositron = defaultCutValue;

  SetCutValue(cutForGamma, "gamma");
  SetCutValue(cutForElectron, "e-");
  SetCutValue(cutForPositron, "e+");

  // Set the secondary production cut lower than 990. eV
  // Very important for high precision of lowenergy processes at low energies
 
  G4double lowLimit = 250. * eV;
  G4double highLimit = 100. * GeV;
  G4ProductionCutsTable::GetProductionCutsTable()->SetEnergyRange(lowLimit, highLimit);
  
  if (verboseLevel>0) DumpCutValuesTable();
}