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// $Id: RE05PrimaryGeneratorAction.cc 98775 2016-08-09 14:30:39Z gcosmo $
//
/// \file RE05/src/RE05PrimaryGeneratorAction.cc
/// \brief Implementation of the RE05PrimaryGeneratorAction class
//

#include "RE05PrimaryGeneratorAction.hh"
#include "RE05PrimaryGeneratorMessenger.hh"

#include "G4Event.hh"
#include "G4HEPEvtInterface.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4SystemOfUnits.hh"
#include "G4AutoLock.hh"

namespace {
 G4Mutex RE05PrimGenDestrMutex = G4MUTEX_INITIALIZER; 
 G4Mutex RE05PrimGenMutex = G4MUTEX_INITIALIZER; 
}

G4VPrimaryGenerator* RE05PrimaryGeneratorAction::fHEPEvt = 0;

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

RE05PrimaryGeneratorAction::RE05PrimaryGeneratorAction()
: G4VUserPrimaryGeneratorAction(),
  fParticleGun(0), 
  fMessenger(0),
  fUseHEPEvt(false)
{
  if(!fHEPEvt)
  {
    const char* filename = "pythia_event.data";
    fHEPEvt = new G4HEPEvtInterface(filename,1);
  }

  G4int n_particle = 1;
  G4ParticleGun* particleGun = new G4ParticleGun(n_particle);
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle
    = particleTable->FindParticle(particleName="mu+");
  particleGun->SetParticleDefinition(particle);
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,1.,0.));
  particleGun->SetParticleEnergy(100.*GeV);
  particleGun->SetParticlePosition(G4ThreeVector(0.*cm,0.*cm,0.*cm));
  fParticleGun = particleGun;

  fMessenger = new RE05PrimaryGeneratorMessenger(this);
  fUseHEPEvt = true;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

RE05PrimaryGeneratorAction::~RE05PrimaryGeneratorAction()
{
  G4AutoLock lock(&RE05PrimGenDestrMutex);
  if(fHEPEvt) { delete fHEPEvt; fHEPEvt=0; }
  delete fParticleGun;
  delete fMessenger;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void RE05PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  if(fUseHEPEvt)
  {
    G4AutoLock lock(&RE05PrimGenMutex);
    fHEPEvt->GeneratePrimaryVertex(anEvent);
  }
  else
  { fParticleGun->GeneratePrimaryVertex(anEvent); }
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......