#include "CbmGeant4Settings.h"

#include <FairLogger.h>
#include <FairRunSim.h>

#include <TVirtualMC.h>
#include <TGeant4.h>
#include <TPythia6Decayer.h>

#include <G4NuclearLevelData.hh>

void CbmGeant4Settings::Init(TVirtualMC* vmc) {

  CbmVMCSettings::Init(vmc);

  TGeant4* vmcg4 = dynamic_cast<TGeant4*>(vmc);

  assert(vmcg4);

  // TODO: These settings were taken over from g4Config.C. To be documented.

  // --- Set external decayer (Pythia) if required
  if(FairRunSim::Instance()->IsExtDecayer()){
    TVirtualMCDecayer* decayer = TPythia6Decayer::Instance();
    vmcg4->SetExternalDecayer(decayer);
    LOG(info) << ": Using Phythia6 decayer";
  }

  // --- Random seed and maximum number of steps
  Text_t buffer[50];
  sprintf(buffer,"/random/setSeeds %i  %i ",gRandom->GetSeed(), gRandom->GetSeed());
  vmcg4->ProcessGeantCommand(buffer);

  vmcg4->SetMaxNStep(fMaxNumSteps);

  for (std::string command: fG4Commands) {
    LOG(info) << "Passing the following command to Geant4: " << command;
    vmcg4->ProcessGeantCommand(command.c_str());
  }

  LOG(warning) << "Fix for Geant4 bug applied (see https://bugzilla-geant4.kek.jp/show_bug.cgi?id=2226)";
  G4NuclearLevelData::GetInstance()->GetParameters()->SetMaxLifeTime(1*CLHEP::microsecond);
}

ClassImp(CbmGeant4Settings);