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//
// Rich advanced example for Geant4
// RichTbAnalysisManager.cc for Rich of LHCb
// History:
// Created: Patricia Mendez (Patricia.Mendez@cern.ch)
/////////////////////////////////////////////////////////////////////////////
#include "G4Timer.hh"

#include "RichTbPrimaryGeneratorAction.hh"

#include "RichTbDetectorConstruction.hh"
#include "RichTbPrimaryGeneratorMessenger.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "Randomize.hh"
#include "G4ios.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
 G4String RichTbPrimaryGeneratorAction::thePrimaryParticleName="proton" ; 

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

RichTbPrimaryGeneratorAction::RichTbPrimaryGeneratorAction(
                                            RichTbDetectorConstruction* RichTbDC)
:RichTbDetector(RichTbDC),rndmFlag("off"),xvertex(0.),yvertex(0.),zvertex(0.),
 vertexdefined(false)
{
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle);
  
  //create a messenger for this class
  gunMessenger = new RichTbPrimaryGeneratorMessenger(this);

  // default particle kinematic

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle
                    = particleTable->FindParticle(particleName="proton");
  particleGun->SetParticleDefinition(particle);
  
  thePrimaryParticleName = particle->GetParticleName() ;

  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.1,0.2,1.));
  particleGun->SetParticleEnergy(100.*GeV);


  particleGun->SetParticlePosition(G4ThreeVector(xvertex,yvertex,zvertex));

}

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

RichTbPrimaryGeneratorAction::~RichTbPrimaryGeneratorAction()
{
  delete particleGun;
  delete gunMessenger;
}

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

void RichTbPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  //this function is called at the begining of event
  // 
  thePrimaryParticleName = particleGun->GetParticleDefinition()->
                                                GetParticleName() ;
  G4double x0,y0,z0 ;

  G4double x1,y1,z1 ;

  if(vertexdefined)
  {

    x1 = 0. ;
    y1 = 0. ;
    z1 = 1. ;

    x0 = xvertex ;
    y0 = yvertex ;
    z0 = zvertex ;
  }
  else
  {

    x1 = 0. ;
    y1 = 0. ;
    z1 = 1. ;

    x0 = 0. ;
    y0 = 0. ;
    z0 = 0. ; // -0.5*(RichTbDetector->GetWorldSizeZ()) ;
  }
  // G4double r0,phi0 ;

  particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));

  particleGun->GeneratePrimaryVertex(anEvent);
}

///////////////////////////////////////////////////////////////////////
//
//

G4String RichTbPrimaryGeneratorAction::GetPrimaryName()
{
   return thePrimaryParticleName ;
}

void RichTbPrimaryGeneratorAction::Setxvertex(G4double x)
{
  vertexdefined = true ;
  xvertex = x ;
  G4cout << " X coordinate of the primary vertex = " << xvertex/mm <<
            " mm." << G4endl;
}

void RichTbPrimaryGeneratorAction::Setyvertex(G4double y)
{
  vertexdefined = true ;
  yvertex = y ;
  G4cout << " Y coordinate of the primary vertex = " << yvertex/mm <<
            " mm." << G4endl;
}
void RichTbPrimaryGeneratorAction::Setzvertex(G4double z)
{
  vertexdefined = true ;
  zvertex = z ;
  G4cout << " Z coordinate of the primary vertex = " << zvertex/mm <<
            " mm." << G4endl;
}