// $Id$
// Category: physics
//
// According to corresponding part of:
// ExN04PhysicsList.cc,v 1.7 1999/12/15 14:49:26 gunter
// GEANT4 tag Name: geant4-01-01

#include "TG4PhysicsConstructorEM.h"

#include <G4ParticleDefinition.hh>
#include <G4ProcessManager.hh>
#include <G4ComptonScattering.hh>
#include <G4GammaConversion.hh>
#include <G4PhotoElectricEffect.hh>
#include <G4MultipleScattering.hh>
#include <G4eIonisation.hh>
#include <G4eBremsstrahlung.hh>
#include <G4eplusAnnihilation.hh>
#include <G4MuIonisation.hh>
#include <G4MuBremsstrahlung.hh>
#include <G4MuPairProduction.hh>
#include <G4hIonisation.hh>

TG4PhysicsConstructorEM::TG4PhysicsConstructorEM(const G4String& name)
  : G4VPhysicsConstructor(name)
{
//
  SetVerboseLevel(1);
}

TG4PhysicsConstructorEM::~TG4PhysicsConstructorEM() {
//
}

// protected methods

void TG4PhysicsConstructorEM::ConstructParticle()
{
// The particles are constructed in the 
// TG4ModularPhysicsList.
// ---
}

void TG4PhysicsConstructorEM::ConstructProcess()
{
// Constructs electromagnetic processes.
// ---

  theParticleIterator->reset();
  while( (*theParticleIterator)() ){
    G4ParticleDefinition* particle = theParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();
    G4String particleName = particle->GetParticleName();
     
    if (particleName == "gamma") {
    // gamma
      // Construct processes for gamma
      pmanager->AddDiscreteProcess(new G4GammaConversion());
      pmanager->AddDiscreteProcess(new G4ComptonScattering());      
      pmanager->AddDiscreteProcess(new G4PhotoElectricEffect());

    } else if (particleName == "e-") {
    //electron
      // Construct processes for electron
      G4VProcess* theeminusMultipleScattering = new G4MultipleScattering();
      G4VProcess* theeminusIonisation = new G4eIonisation();
      G4VProcess* theeminusBremsstrahlung = new G4eBremsstrahlung();
      // add processes
      pmanager->AddProcess(theeminusMultipleScattering);
      pmanager->AddProcess(theeminusIonisation);
      pmanager->AddProcess(theeminusBremsstrahlung);      
      // set ordering for AlongStepDoIt
      pmanager->SetProcessOrdering(theeminusMultipleScattering, idxAlongStep,  1);
      pmanager->SetProcessOrdering(theeminusIonisation, idxAlongStep,  2);
      // set ordering for PostStepDoIt
      pmanager->SetProcessOrdering(theeminusMultipleScattering, idxPostStep, 1);
      pmanager->SetProcessOrdering(theeminusIonisation, idxPostStep, 2);
      pmanager->SetProcessOrdering(theeminusBremsstrahlung, idxPostStep, 3);

    } else if (particleName == "e+") {
    //positron
      // Construct processes for positron
      G4VProcess* theeplusMultipleScattering = new G4MultipleScattering();
      G4VProcess* theeplusIonisation = new G4eIonisation();
      G4VProcess* theeplusBremsstrahlung = new G4eBremsstrahlung();
      G4VProcess* theeplusAnnihilation = new G4eplusAnnihilation();
      // add processes
      pmanager->AddProcess(theeplusMultipleScattering);
      pmanager->AddProcess(theeplusIonisation);
      pmanager->AddProcess(theeplusBremsstrahlung);
      pmanager->AddProcess(theeplusAnnihilation);
      // set ordering for AtRestDoIt
      pmanager->SetProcessOrderingToFirst(theeplusAnnihilation, idxAtRest);
      // set ordering for AlongStepDoIt
      pmanager->SetProcessOrdering(theeplusMultipleScattering, idxAlongStep,  1);
      pmanager->SetProcessOrdering(theeplusIonisation, idxAlongStep,  2);
      // set ordering for PostStepDoIt
      pmanager->SetProcessOrdering(theeplusMultipleScattering, idxPostStep, 1);
      pmanager->SetProcessOrdering(theeplusIonisation, idxPostStep, 2);
      pmanager->SetProcessOrdering(theeplusBremsstrahlung, idxPostStep, 3);
      pmanager->SetProcessOrdering(theeplusAnnihilation, idxPostStep, 4);
  
    } else if( particleName == "mu+" || 
               particleName == "mu-"    ) {
    //muon  
     // Construct processes for muon+
     G4VProcess* aMultipleScattering = new G4MultipleScattering();
     G4VProcess* aBremsstrahlung = new G4MuBremsstrahlung();
     G4VProcess* aPairProduction = new G4MuPairProduction();
     G4VProcess* anIonisation = new G4MuIonisation();
      // add processes
     pmanager->AddProcess(anIonisation);
     pmanager->AddProcess(aMultipleScattering);
     pmanager->AddProcess(aBremsstrahlung);
     pmanager->AddProcess(aPairProduction);
     // set ordering for AlongStepDoIt
     pmanager->SetProcessOrdering(aMultipleScattering, idxAlongStep,  1);
     pmanager->SetProcessOrdering(anIonisation, idxAlongStep,  2);
     // set ordering for PostStepDoIt
     pmanager->SetProcessOrdering(aMultipleScattering, idxPostStep, 1);
     pmanager->SetProcessOrdering(anIonisation, idxPostStep, 2);
     pmanager->SetProcessOrdering(aBremsstrahlung, idxPostStep, 3);
     pmanager->SetProcessOrdering(aPairProduction, idxPostStep, 4);
     
    } else if( particleName == "GenericIon" ) {
     G4VProcess* aionIonization = new G4hIonisation;
     G4VProcess* aMultipleScattering = new G4MultipleScattering();
     pmanager->AddProcess(aionIonization);
     pmanager->AddProcess(aMultipleScattering);
     // set ordering for AlongStepDoIt
     pmanager->SetProcessOrdering(aMultipleScattering, idxAlongStep,  1);
     pmanager->SetProcessOrdering(aionIonization, idxAlongStep,  2);
     // set ordering for PostStepDoIt
     pmanager->SetProcessOrdering(aMultipleScattering, idxPostStep, 1);
     pmanager->SetProcessOrdering(aionIonization, idxPostStep, 2);

   } else if ((!particle->IsShortLived()) &&
	      (particle->GetPDGCharge() != 0.0) && 
	      (particle->GetParticleName() != "chargedgeantino")) {
     // all others charged particles except geantino
     G4VProcess* aMultipleScattering = new G4MultipleScattering();
     G4VProcess* anIonisation = new G4hIonisation();
     // add processes
     pmanager->AddProcess(anIonisation);
     pmanager->AddProcess(aMultipleScattering);
     // set ordering for AlongStepDoIt
     pmanager->SetProcessOrdering(aMultipleScattering, idxAlongStep,  1);
     pmanager->SetProcessOrdering(anIonisation, idxAlongStep,  2);
     // set ordering for PostStepDoIt
     pmanager->SetProcessOrdering(aMultipleScattering, idxPostStep, 1);
     pmanager->SetProcessOrdering(anIonisation, idxPostStep, 2);
    }
  }

  if (verboseLevel>0)
    G4cout << "### Electromagnetic physics constructed." << G4endl;
}