//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// $Id$
//
/// \file parallel/ParN04/src/ExN04PrimaryGeneratorAction.cc
/// \brief Implementation of the ExN04PrimaryGeneratorAction class
//

#include "ExN04PrimaryGeneratorAction.hh"
#include "ExN04PrimaryGeneratorMessenger.hh"

#include "G4Event.hh"
#include "G4HEPEvtInterface.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

ExN04PrimaryGeneratorAction::ExN04PrimaryGeneratorAction()
{
  const char* filename = "pythia_event.data";
  HEPEvt = new G4HEPEvtInterface(filename);

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

  messenger = new ExN04PrimaryGeneratorMessenger(this);
  useHEPEvt = true;
}

ExN04PrimaryGeneratorAction::~ExN04PrimaryGeneratorAction()
{
  delete HEPEvt;
  delete particleGun;
  delete messenger;
}

void ExN04PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  if(useHEPEvt)
  { HEPEvt->GeneratePrimaryVertex(anEvent); }
  else
  { particleGun->GeneratePrimaryVertex(anEvent); }
}


