#include "CbmGeant4Settings.h"

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

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

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(10000000);  // default is 30000

  // --- Execute Geant4 configuration macro
  /*
  TString configMacro(gSystem->Getenv("VMCWORKDIR"));
  configMacro += "/gconfig/g4config.in";
  LOG(info) << ": Using Geant4 configuration from "
      << configMacro;
  vmcg4->ProcessGeantMacro(configMacro.Data());
  */
  
  // 
  for (std::string command: fG4Commands) { 
    LOG(info) << "Passing the following command to Geant4: " << command;
    vmcg4->ProcessGeantCommand(command.c_str());
  }
  
}

ClassImp(CbmGeant4Settings);