PPFXThinNucWeightCalc.cxx

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#include "larsim/EventWeight/Base/WeightCalc.h"
#include "larsim/EventWeight/Base/WeightCalcCreator.h"

#include "CLHEP/Random/RandGaussQ.h"

#include "MakeReweight.h"
#include "cetlib/search_path.h"
#include "dk2nu/tree/dk2nu.h"
#include "dk2nu/tree/dkmeta.h"
#include "nugen/EventGeneratorBase/GENIE/MCTruthAndFriendsItr.h"

#include "TSystem.h"

namespace evwgh {
  class PPFXThinNucWeightCalc : public WeightCalc {
  public:
    PPFXThinNucWeightCalc();
    void Configure(fhicl::ParameterSet const& p, CLHEP::HepRandomEngine& engine) override;
    std::vector<std::vector<double>> GetWeight(art::Event& e) override;

  private:
    std::string fGenieModuleLabel;

    std::vector<std::string> fInputLabels;
    std::string fPPFXMode;
    std::string fMode;
    std::string fHorn;
    std::string fTarget;
    int fSeed;
    int fVerbose;
    NeutrinoFluxReweight::MakeReweight* fPPFXrw;

    DECLARE_WEIGHTCALC(PPFXThinNucWeightCalc)
  };

  PPFXThinNucWeightCalc::PPFXThinNucWeightCalc() {}

  void PPFXThinNucWeightCalc::Configure(fhicl::ParameterSet const& p,
                                        CLHEP::HepRandomEngine& engine)
  {
    //get configuration for this function
    fhicl::ParameterSet const& pset = p.get<fhicl::ParameterSet>(GetName());
    fGenieModuleLabel = p.get<std::string>("genie_module_label");

    //ppfx setup
    fInputLabels = pset.get<std::vector<std::string>>("input_labels");
    fPPFXMode = pset.get<std::string>("ppfx_mode");
    fVerbose = pset.get<int>("verbose");
    fMode = pset.get<std::string>("mode");
    fHorn = pset.get<std::string>("horn_curr");
    fTarget = pset.get<std::string>("target_config");
    fSeed = pset.get<int>("random_seed", -1);

    gSystem->Setenv("MODE", fPPFXMode.c_str());

    fPPFXrw = NeutrinoFluxReweight::MakeReweight::getInstance();
    std::cout << "PPFX instance " << fPPFXrw << std::endl;

    std::string inputOptions;                               // Full path.
    std::string mode_file = "inputs_" + fPPFXMode + ".xml"; // Just file name.
    cet::search_path sp("FW_SEARCH_PATH");
    sp.find_file(mode_file, inputOptions);

    if (fSeed != -1) fPPFXrw->setBaseSeed(fSeed); // Set the random seed
    std::cout << "is PPFX setup : " << fPPFXrw->AlreadyInitialized() << std::endl;
    std::cout << "Setting PPFX, inputs: " << inputOptions << std::endl;
    std::cout << "Setting Horn Current Configuration to: " << fHorn << std::endl;
    std::cout << "Setting Target Configuration to: " << fTarget << std::endl;
    if (!(fPPFXrw->AlreadyInitialized())) { fPPFXrw->SetOptions(inputOptions); }
    std::cout << "PPFX just set with mode: " << fPPFXMode << std::endl;
  }

  std::vector<std::vector<double>> PPFXThinNucWeightCalc::GetWeight(art::Event& e)
  {
    std::vector<std::vector<double>> weight;
    evgb::MCTruthAndFriendsItr mcitr(e, fInputLabels);
    //calculate weight(s) here

    int nmctruth = 0, nmatched = 0;
    bool flag = true;
    int ievt = -1;
    std::vector<art::Handle<std::vector<bsim::Dk2Nu>>> dk2nus2 =
      e.getMany<std::vector<bsim::Dk2Nu>>();
    for (size_t dk2 = 0; dk2 < dk2nus2.size(); ++dk2) {
      art::Handle<std::vector<bsim::Dk2Nu>> dk2nus = dk2nus2[dk2];
    }
    while ((flag = mcitr.Next())) {
      std::string label = mcitr.GetLabel();
      const simb::MCTruth* pmctruth = mcitr.GetMCTruth();
      // const simb::GTruth*  pgtruth  = mcitr.GetGTruth();
      //not-used//const simb::MCFlux*      pmcflux   = mcitr.GetMCFlux();
      const bsim::Dk2Nu* pdk2nu = mcitr.GetDk2Nu();
      //not-used//const bsim::NuChoice*    pnuchoice = mcitr.GetNuChoice();
      // art::Ptr<simb::MCTruth>  mctruthptr = mcitr.GetMCTruthPtr();

      ++ievt;
      ++nmctruth;
      if (fVerbose > 0) {
        std::cout << "FluxWeightCalculator [" << std::setw(4) << ievt << "] "
                  << " label \"" << label << "\" MCTruth@ " << pmctruth << " Dk2Nu@ " << pdk2nu
                  << std::endl;
      }
      if (!pdk2nu) continue;
      ++nmatched;

      //RWH//bsim::Dk2Nu*  tmp_dk2nu  = fTmpDK2NUConversorAlg.construct_toy_dk2nu( &mctruth,&mcflux);
      //RWH//bsim::DkMeta* tmp_dkmeta = fTmpDK2NUConversorAlg.construct_toy_dkmeta(&mctruth,&mcflux);
      //RWH// those appear to have been memory leaks
      //RWH// herein begins the replacment for the "construct_toy_dkmeta"

      static bsim::DkMeta
        dkmeta_obj; //RWH// create this on stack (destroyed when out-of-scope)  ... or static
      dkmeta_obj.tgtcfg = fTarget;
      dkmeta_obj.horncfg = fHorn;
      (dkmeta_obj.vintnames).push_back("Index_Tar_In_Ancestry");
      (dkmeta_obj.vintnames).push_back("Playlist");
      bsim::DkMeta* tmp_dkmeta = &dkmeta_obj;
      //RWH// herein ends this block

      // sigh ....
      //RWH// this is the signature in NeutrinoFluxReweight::MakeReweight :
      //      //! create an interaction chain from the new dk2nu(dkmeta) format
      //      void calculateWeights(bsim::Dk2Nu* nu, bsim::DkMeta* meta);
      //RWH// these _should_ be "const <class>*" because we don't need to change them
      //RWH// and the pointers we get out of the ART record are going to be const.
      bsim::Dk2Nu* tmp_dk2nu = const_cast<bsim::Dk2Nu*>(pdk2nu); // remove const-ness
      try {
        fPPFXrw->calculateWeights(tmp_dk2nu, tmp_dkmeta);
      }
      catch (...) {
        std::cerr << "Failed to calcualte weight" << std::endl;
        continue;
      }
      //Get weights:
      if (fMode == "reweight") {
        double ppfx_cv_wgt = fPPFXrw->GetCVWeight();
        std::vector<double> wvec = {ppfx_cv_wgt};
        weight.push_back(wvec);
      }
      else {
        std::vector<double> vttpcnucleon = fPPFXrw->GetWeights("ThinTargetpCNucleon");

        std::vector<double> tmp_vhptot;
        for (unsigned int iuniv = 0; iuniv < vttpcnucleon.size(); iuniv++) {
          tmp_vhptot.push_back(float(vttpcnucleon[iuniv]));
        }
        weight.push_back(tmp_vhptot);
      }
    }
    return weight;
  }
  REGISTER_WEIGHTCALC(PPFXThinNucWeightCalc)
}