LArG4GenShowerLib.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/

 
// class header
#include "LArG4GenShowerLib.h"
 
// local include(s):
#include "LArG4GenShowerLib/StepInfo.h"
#include "LArG4GenShowerLib/StepInfoCollection.h"
 
// athena includes
#include "GeneratorObjects/McEventCollection.h" // For MC Truth information:
#include "GeoModelInterfaces/IGeoModelSvc.h"
#include "GaudiKernel/IToolSvc.h"
#include "LArG4ShowerLib/ShowerEnergySpot.h"
#include "LArG4ShowerLib/Shower.h"
#include "LArG4ShowerLib/ShowerLibList.h"
 
// geant includes
#include "G4Version.hh"
 
// ROOT includes
#include "TFile.h"
 
// STL include(s):
#include <sstream>
#include <cstdlib>
 
using CLHEP::Hep3Vector;
 
// definition for helper struct
class Dist {
public:
  Dist(ShowerLib::StepInfo* the_h1, ShowerLib::StepInfo* the_h2) : h1(the_h1), h2(the_h2) {}
  ShowerLib::StepInfo* h1;
  ShowerLib::StepInfo* h2;
  ShowerLib::StepInfo* merge ()
  {
    ShowerLib::StepInfo* newStep = new ShowerLib::StepInfo(*h1,*h2);
    h1->setValid(false);
    h2->setValid(false);
    return newStep;
  }
};
 
class  stepInfoDistCompare{
public:
  enum CompareType {RHO,R,Z};
  explicit stepInfoDistCompare(const CompareType type) : m_type(type) {}
  bool operator()( const ShowerLib::StepInfo * first,  const ShowerLib::StepInfo * second) const {
    return sortFunction(first, second, m_type );
  }
private:
  CompareType m_type;
  //returns true if first is closer to the origin. this should sort from closest to farest
  bool sortFunction ( const ShowerLib::StepInfo* first,  const ShowerLib::StepInfo* second, const CompareType type) const {
    if (type == RHO) {
      if (first->position().mag2() < second->position().mag2()) return true;
      return false;
    } else if (type == R) {
      if (first->position().perp2() < second->position().perp2()) return true;
      return false;
    } else if (type == Z) {
      if (first->position().z() < second->position().z()) return true;
      return false;
    }
    return true; //it's here just to avoid warnings
  }
};
 
StatusCode LArG4GenShowerLib::initialize()
{
  ATH_MSG_DEBUG ( "Initializing" );
 
  ShowerLib::IShowerLib* library = nullptr;
 
  std::vector< std::string >::const_iterator nameiter;
 
  ATH_MSG_DEBUG ( "Starting struct files iteration" );
  for (nameiter = m_lib_struct_files.value().begin(); nameiter != m_lib_struct_files.value().end(); ++nameiter ) {
 
    ATH_MSG_DEBUG ( "Struct file: " << (*nameiter) );
 
    library = ShowerLib::iterateStruct(*nameiter);
 
    if (library == nullptr) {
      ATH_MSG_WARNING ( "Library structure file " << (*nameiter) << " doesn't describe a valid library" );
      continue;
    }
 
    std::stringstream location;
    location << library->detector() << "/" << library->particle_id();
    m_libraries[location.str()] = library;
    m_libraries_by_filename[(*nameiter)+".root"] = library;
    m_stat_lib_saved[library]=0;
    m_stat_lib_notsaved[library]=0;
 
    ATH_MSG_VERBOSE ( "Library named " << (*nameiter)+".root" << "is stored at the location " << location.str() );
 
  }
 
  if (m_libraries.empty()) {
    ATH_MSG_ERROR ( "No valid library structure files found. Further execution is pointless." );
    return StatusCode::FAILURE;
  }
 
  ATH_MSG_DEBUG ( "LArG4GenShowerLib " << this->name() << " initialized" );
 
  return StatusCode::SUCCESS;
}
 
StatusCode LArG4GenShowerLib::execute(const EventContext& /*ctx*/)
{
  const ShowerLib::StepInfoCollection* eventStepsES = getStepInfo();
 
  auto theParticle = getParticleFromMC();
  if (!theParticle) {
    ATH_MSG_ERROR ( "Couldn't get truth particle" );
    return StatusCode::FAILURE;
  }
 
  m_stat_numshowers += 1;
 
  double fraction = eventStepsES->invalid_energy/theParticle->momentum().e();
  if (fraction > m_energyFraction) {
    ATH_MSG_WARNING ( "Shower deposited too much energy outside the calorimeter region (" << (int)(fraction*100) << "%), ignoring" );
    m_stat_invalid += 1;
    return StatusCode::SUCCESS;
  }
  //otherwise shower is valid. even if it ultimately wont go to any library
  m_stat_valid += 1;
 
  ShowerLib::StepInfoList* eventSteps;
 
  if (eventStepsES->size()>500) {
    eventSteps = copyStepInfoZeroCleanup(eventStepsES);
  } else {
    eventSteps = copyStepInfo(eventStepsES);
  }
 
  double etot = 0.;
  for (ShowerLib::StepInfoList::const_iterator iter = eventSteps->begin();iter != eventSteps->end();++iter) {
    etot += (*iter)->dep();
  }
 
  std::stringstream location;
 
  location << eventStepsES->detector << "/" << theParticle->pdg_id();
 
  if (m_libraries.find(location.str()) == m_libraries.end()) {
    ATH_MSG_WARNING ( "No library structure for " << location.str() );
 
    for (ShowerLib::StepInfoList::iterator i(eventSteps->begin());i != eventSteps->end(); ++i) {
      delete (*i);
    }
    delete eventSteps;
    m_stat_nolib += 1;
    return StatusCode::SUCCESS; //not really an error, just lost time
  }
 
  Hep3Vector origin(theParticle->production_vertex()->position().x(),
                    theParticle->production_vertex()->position().y(),
                    theParticle->production_vertex()->position().z());
 
  // Also save direction vector. By default shower lib is created in
  // the direction of the input particle.
  Hep3Vector DirectionShower(theParticle->momentum().px(),
                             theParticle->momentum().py(),
                             theParticle->momentum().pz());
  DirectionShower /= DirectionShower.mag();
  Hep3Vector OrthoShower = DirectionShower.orthogonal();
  OrthoShower /= OrthoShower.mag();
  Hep3Vector CrossShower = DirectionShower.cross(OrthoShower);
  CrossShower /= CrossShower.mag();
 
  // Rotate the hit such that Z direction is along the shower direction
  for (ShowerLib::StepInfoList::iterator i(eventSteps->begin()); i != eventSteps->end(); ++i) {
    Hep3Vector HitDir = (*i)->position() - origin;
 
    (*i)->setX(HitDir*OrthoShower);
    (*i)->setY(HitDir*CrossShower);
    (*i)->setZ(HitDir*DirectionShower);
  }
 
  ATH_MSG_VERBOSE ( "Size of input shower: " << eventSteps->size() );
 
  clusterize(eventSteps);
 
  ATH_MSG_VERBOSE ( "Size after clusterization: " << eventSteps->size() );
 
  if (eventSteps->size() > 10) {
    truncate(eventSteps);
    ATH_MSG_VERBOSE ( "Size after truncation: " << eventSteps->size() );
  }
 
  double maxZ = 0, maxR = 0;
  double edep = 0.;
 
  double containmentEnergy = m_containmentEnergy * etot;
 
  // sort the hits by R, make the border where 95% is deposited
  eventSteps->sort(stepInfoDistCompare(stepInfoDistCompare::R));
  ShowerLib::StepInfoList::const_iterator iter = eventSteps->begin();
  for (;(iter != eventSteps->end()) && (edep < containmentEnergy);++iter) {
    edep += (*iter)->dep();
    maxR = (*iter)->position().r();
  }
 
  edep = 0.;
  // sort the hits by Z, make the border where 95% is deposited
  eventSteps->sort(stepInfoDistCompare(stepInfoDistCompare::Z));
  iter = eventSteps->begin();
  for (;(iter != eventSteps->end()) && (edep < containmentEnergy);++iter) {
    edep += (*iter)->dep();
    maxZ = (*iter)->position().z();
  }
 
  ShowerLib::Shower* shower = new ShowerLib::Shower();
  shower->setZSize(maxZ);
  shower->setRSize(maxR);
 
  for (ShowerLib::StepInfoList::iterator i(eventSteps->begin());i != eventSteps->end(); ++i) {
 
      shower->push_back(new ShowerLib::ShowerEnergySpot(G4ThreeVector((*i)->x(), (*i)->y(), (*i)->z()),(*i)->dep(),(*i)->time()));
 
    delete (*i);
  }
 
  delete eventSteps;
 
  if ((*m_libraries.find(location.str())).second->storeShower(std::move(theParticle), shower)) {
    m_stat_lib_saved[(*m_libraries.find(location.str())).second] += 1;
  } else {
    ATH_MSG_WARNING ( "Wasn't able to store shower (" << location.str() << ")" );
    m_stat_lib_notsaved[(*m_libraries.find(location.str())).second] += 1;
  }
 
  ATH_MSG_VERBOSE ( "Successfully finished" );
 
  return StatusCode::SUCCESS;
}
 
HepMC::ConstGenParticlePtr LArG4GenShowerLib::getParticleFromMC()
{
  const McEventCollection* mcEvent;
  if (evtStore()->retrieve(mcEvent,"GEN_EVENT").isFailure()) return nullptr;
 
  // Return the last particle of the event.
  if (mcEvent)
    return !mcEvent->at(0)->particles().empty() ? mcEvent->at(0)->particles().back() : nullptr;
 
  return nullptr;
}
 
const ShowerLib::StepInfoCollection* LArG4GenShowerLib::getStepInfo()
{
  const ShowerLib::StepInfoCollection* eventStepsES;
  if (evtStore()->retrieve(eventStepsES, "EventSteps").isFailure()) return nullptr;
 
  return eventStepsES;
 
}
 
ShowerLib::StepInfoList* LArG4GenShowerLib::copyStepInfo(const ShowerLib::StepInfoCollection* stepinfo)
{
  ShowerLib::StepInfoList *rez = new ShowerLib::StepInfoList();
  ShowerLib::StepInfo *copy = nullptr;
 
  for (ShowerLib::StepInfoCollection::const_iterator iter = stepinfo->begin(); iter!=stepinfo->end(); ++iter) {
    copy = new ShowerLib::StepInfo(*(*iter));
    rez->push_back(copy);
  }
 
  return rez;
}
 
ShowerLib::StepInfoList* LArG4GenShowerLib::copyStepInfoZeroCleanup(const ShowerLib::StepInfoCollection* stepinfo)
{
  ShowerLib::StepInfoList *rez = new ShowerLib::StepInfoList();
 
  const double dsame = 1.; // 1mm^2
  ShowerLib::StepInfo *i1 = nullptr;
  ShowerLib::StepInfo *i2 = nullptr;
 
  for (ShowerLib::StepInfoCollection::const_iterator i = stepinfo->begin(); i!=stepinfo->end(); ++i) {
    if(i1 == nullptr) {
      i1 = new ShowerLib::StepInfo(*(*i));
      rez->push_back(i1);
    }
    else {
      i2 = new ShowerLib::StepInfo(*(*i));
      // if distance below cut off, combined and erase
      if ( (i1)->diff2(*i2) < dsame) {
        *i1 += *i2;
        delete i2;
      } else {
        rez->push_back(i2);
        i1 = i2;
      }
    }
  }
 
  return rez;
}
 
void LArG4GenShowerLib::clusterize(ShowerLib::StepInfoList* stepinfo)
{
  typedef std::multimap<double,Dist> distMap;
 
  distMap distances;
 
  //fill the map
  for (ShowerLib::StepInfoList::iterator i_h1(stepinfo->begin()); i_h1 != stepinfo->end(); ++i_h1) {
    //iterate only the upper triangle of N*N matrix, since we do not want to create every distance twice
    for (ShowerLib::StepInfoList::reverse_iterator i_h2(stepinfo->rbegin()); (*i_h2) != (*i_h1); ++i_h2) {
      distances.insert(distMap::value_type((*i_h1)->diff2(**i_h2),Dist(*i_h1, *i_h2)));
    }
  }
 
  const double rmin = m_maxRadius;
 
  int cursize = stepinfo->size();
 
 
  while (cursize > 1) {
    distMap::iterator iter = distances.begin();
    while ( !( (*iter).second.h1->valid() && (*iter).second.h2->valid() ) ) {
      distances.erase(iter++); //find the first (i.e. closest) valid pair of hits, removing invalid
    }
 
    if ((*iter).first >  rmin ) break; //if the closest already far enough - stop
 
    ShowerLib::StepInfo* mergedHit = (*iter).second.merge(); //merge two closest hits
 
    for (ShowerLib::StepInfoList::iterator i_h1(stepinfo->begin()); i_h1 != stepinfo->end(); ++i_h1) {
      if ((*i_h1)->valid()){ //only for valid hits
        distances.insert(distMap::value_type((*i_h1)->diff2(*mergedHit),Dist(*i_h1, mergedHit))); //calculate and store distances
      }
    }
 
    stepinfo->push_back(mergedHit); //store the merged hit
    cursize--; //merging == -1 valid hit
  }
 
  // remove invalid
  for (ShowerLib::StepInfoList::iterator i = stepinfo->begin(); i != stepinfo->end();) {
    if ((*i)->valid()) {
      ++i;
    } else {
      delete (*i);
      i = stepinfo->erase(i);
    }
  }
 
}
 
void LArG4GenShowerLib::truncate(ShowerLib::StepInfoList* stepinfo)
{
  double etot = 0;
  stepinfo->sort(stepInfoDistCompare(stepInfoDistCompare::RHO));
 
  for (ShowerLib::StepInfoList::const_iterator i(stepinfo->begin()); i != stepinfo->end(); ++i) {
    etot += (*i)->dep();
  }
 
  double minEnergy = m_minEnergy * etot;
  double rsum = 0.;
  ShowerLib::StepInfoList::iterator iterCut;
  //we're continuing our cycle if  (we're not at the end yet)  && ( (the current hit is still inside maxDistance radius) || (the total energy still less then the threshold) )
  for (iterCut = stepinfo->begin(); (iterCut != stepinfo->end()) && (((*iterCut)->position().mag2() <  m_maxDistance) || (rsum < minEnergy));++iterCut) {
    rsum += (*iterCut)->dep();
  }
 
  if (iterCut == stepinfo->end()) {
    return;
  }
 
  stepinfo->erase(iterCut,stepinfo->end());
 
  if (rsum == 0) { //WTF?
    return;
  }
 
  const double inv_rsum = 1. / rsum;
  for (iterCut = stepinfo->begin(); iterCut != stepinfo->end(); ++iterCut){
    (*iterCut)->setE((*iterCut)->dep() * etot*inv_rsum);
  }
 
}
 
void LArG4GenShowerLib::addingTagsToLibrary()
{
  char* atlasProject = getenv("AtlasProject");
  char* atlasVersion = getenv("AtlasVersion");
  std::string atlasReleaseTag = (atlasProject? std::string(atlasProject)+std::string("-") : std::string("Unknown-"));
  if(atlasVersion) {
    atlasReleaseTag += std::string(atlasVersion);
  }
  else {
    atlasReleaseTag += std::string("Unknown");
  }
  
  // get geometry version
  ServiceHandle<IGeoModelSvc> geoModelSvc("GeoModelSvc", this->name());
  const auto & version = geoModelSvc->atlasVersion();
  //
  // get geant4 version and strip off CVS Name tag
  std::string g4Version = G4Version;
  size_t pos = g4Version.find("$Name: ");
  if (pos != std::string::npos) {
    g4Version.erase(pos, 7);
  }
  pos = g4Version.find(" $");
  if (pos != std::string::npos) {
    g4Version.erase(pos, 2);
  }
  libMap::iterator itr;
  for (itr = m_libraries.begin();itr != m_libraries.end();++itr){
    // release
    (*itr).second->release(atlasReleaseTag);
    (*itr).second->geometry(version);
    // get Physics list
    (*itr).second->physicsList(m_physicslist_name);
    //
    (*itr).second->geantVersion(g4Version);
  }
}
 
 
StatusCode LArG4GenShowerLib::finalize()
{
 
  // add condition tags
  addingTagsToLibrary();
 
  libMap::iterator itr;
  for (itr = m_libraries_by_filename.begin();itr != m_libraries_by_filename.end();++itr){
    ATH_MSG_DEBUG ( "Writing shower library to file " << (*itr).first );
 
    TFile libr((*itr).first.c_str(),"RECREATE");
 
    if (!(*itr).second->writeToROOT(&libr)) {
      ATH_MSG_ERROR ( "Wasn't able to write " << (*itr).first << ". Probably empty lib." );
    }
 
    libr.Close();
  }
  if (m_stat_numshowers> 0) {
    ATH_MSG_DEBUG ( "********Statistics for GenShowerLib********" );
    ATH_MSG_DEBUG ( "Total number of showers: " << m_stat_numshowers
                   << ", valid: "<< m_stat_valid << " (" << (m_stat_valid*100)/m_stat_numshowers << "%)"
                   << ", invalid: " << m_stat_invalid << " (" << (m_stat_invalid*100)/m_stat_numshowers << "%)" );
    for (itr = m_libraries.begin();itr != m_libraries.end();++itr){
      ATH_MSG_DEBUG ( "*******************************************" );
      std::stringstream ss((*itr).second->statistics());
      for(std::string line; std::getline(ss,line);)
        ATH_MSG_DEBUG ( line );
      ATH_MSG_DEBUG ( "Saved: " << m_stat_lib_saved[(*itr).second] << " Rejected: " << m_stat_lib_notsaved[(*itr).second] );
    }
    ATH_MSG_DEBUG ( "*******************************************" );
    ATH_MSG_DEBUG ( "Showers with no corresponding library: " << m_stat_nolib << " (" << (m_stat_nolib*100)/m_stat_numshowers << "%)" );
  }
  ATH_MSG_DEBUG ( "Finalized." );
 
  return StatusCode::SUCCESS;
}
 
 
void LArG4GenShowerLib::calculateMoments(const ShowerLib::StepInfoCollection& eventSteps,
                                         double& weights, double& xavfra, double& yavfra, double& ravfra)
{
  double escal(0.);
  double xav(0.), yav(0.), xav2(0.), yav2(0.);
 
  for (ShowerLib::StepInfoCollection::const_iterator i=eventSteps.begin();i<eventSteps.end(); ++i) {
    escal += (*i)->dep();
    xav   += (*i)->x()*(*i)->dep();
    yav   += (*i)->y()*(*i)->dep();
    xav2  += (*i)->x()*(*i)->x()*(*i)->dep();
    yav2  += (*i)->y()*(*i)->y()*(*i)->dep();
  }
 
  // Center of gravity:
  const double inv_escal = escal == 0 ? 1 : 1. / escal;
  xavfra = xav*inv_escal;
  yavfra = yav*inv_escal;
  // Second momentum:
  ravfra = std::sqrt(std::abs((xav2*inv_escal-xavfra*xavfra) +
                              (yav2*inv_escal-yavfra*yavfra)));
  // energy is used as weights
  weights = escal;
 
  return;
}