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// $Id: PhotInPrimaryGeneratorAction.cc,v 1.6 2006/06/29 16:25:21 gunter Exp $
// GEANT4 tag $Name:  $
//

#define debug

#include "PhotInPrimaryGeneratorAction.hh"

PhotInPrimaryGeneratorAction::PhotInPrimaryGeneratorAction():
  section(1),detector(0),part("gamma"),energy(100.),oldPart("gamma"),oldEnergy(100.)
{
#ifdef debug
  G4cout<<"PhotInPrimaryGeneratorAction::Constructor: part="<<part<<", E="<<energy<<G4endl;
#endif
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle); // Initialization of the pointer from BODY

  // default particle kinematic
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle = particleTable->FindParticle(particleName=part);
  particleGun->SetParticleDefinition(particle);
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  particleGun->SetParticleEnergy(energy*GeV);
}

PhotInPrimaryGeneratorAction::~PhotInPrimaryGeneratorAction() {delete particleGun;}

void PhotInPrimaryGeneratorAction::SetProjectileName(G4String partName)
{
#ifdef debug
  G4cout<<"PhotInPrimaryGeneratorAction::SetProjectileName:Before Name="<<partName
								<<", oldName="<<part<<G4endl;
#endif
  //@@ Make a check that such a particle exists (M.K.)
  part=partName;
#ifdef debug
  G4cout<<"PhotInPrimaryGeneratorAction::SetProjectileName: After Name="<<part<<G4endl;
#endif
}

void PhotInPrimaryGeneratorAction::SetProjectileEnergy(G4double partEnergy)
{
#ifdef debug
  G4cout<<"PhotInPrimaryGeneratorAction::SetProjectileEnergy: before E="<<energy<<G4endl;
#endif
  energy=partEnergy;
#ifdef debug
  G4cout<<"PhotInPrimaryGeneratorAction::SetProjectileEnergy: before E="<<energy<<G4endl;
#endif
}
 
void PhotInPrimaryGeneratorAction::SetDetector(PhotInDetectorConstruction* det)
{
#ifdef debug
  G4cout<<"PhotInPrimaryGeneratorAction::SetDetector: is called"<<G4endl;
#endif
  detector=det;
}

void PhotInPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
#ifdef debug
  G4cout<<"PhotInPrimaryGeneratorAction::GeneratePrimaries: "<<part<<",E="<<energy<<G4endl;
#endif
  if(part!=oldPart || energy!=oldEnergy)
  {
#ifdef debug
    G4cout<<"PhotInPrimaryGeneratorAction::GeneratePrimaries: part&E're redefined"<<G4endl;
#endif
    // new particle kinematic
    G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
    G4String particleName;
    G4ParticleDefinition* particle = particleTable->FindParticle(particleName=part);
    particleGun->SetParticleDefinition(particle);
    particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
    particleGun->SetParticleEnergy(energy*GeV);
    oldPart=part;
    oldEnergy=energy;
  }

  G4double hY=detector->GetHalfYWidth();
  G4double hZ=detector->GetHalfZThickness();
  if(section==1) // The section #1 is always in the center (comment or change if #ofSec!=3)
  {
    particleGun->SetParticlePosition(G4ThreeVector(0.,0.,-hZ));
    particleGun->GeneratePrimaryVertex(anEvent);
  }
  else if(detector->IsSerial())
  {
    particleGun->SetParticlePosition(G4ThreeVector(0.,0.,hZ*(section+section-3)));
    particleGun->GeneratePrimaryVertex(anEvent);
  }
  else
  {
    particleGun->SetParticlePosition(G4ThreeVector(0.,hY*(section+section-2),-hZ));
    particleGun->GeneratePrimaryVertex(anEvent);
  }
}