// $Id: Geant4Converter.cpp 603 2013-06-13 21:15:14Z markus.frank $
//====================================================================
//  AIDA Detector description implementation for LCD
//--------------------------------------------------------------------
//
//  Author     : M.Frank
//
//====================================================================

// Framework include files
#include "DD4hep/InstanceCount.h"
#include "DDG4/Geant4TrackingPostAction.h"
#include "DDG4/Geant4TrackHandler.h"

// Geant4 include files
#include "G4TrackingManager.hh"

#include <algorithm>

using namespace std;
using namespace DD4hep::Simulation;

struct FindString {
  const std::string& m_name;
  FindString(const std::string& n)
      : m_name(n) {
  }
  bool operator()(const std::string& n) const {
    return m_name == n;
  }
  //template <class T> bool operator==(const std::pair<std::string,T>& cmp)  const
  //{  return cmp.first == m_name;  }
  //template <class T> bool operator==(const std::pair<T,std::string>& cmp)  const
  //{  return cmp.second == m_name;  }
};

/// Standard constructor
Geant4TrackingPostAction::Geant4TrackingPostAction(Geant4Context* context, const std::string& name)
    : Geant4TrackingAction(context, name) {
  InstanceCount::increment(this);
  declareProperty("IgnoredProcesses", m_ignoredProcs);
  declareProperty("RequiredProcesses", m_requiredProcs);
}

/// Default destructor
Geant4TrackingPostAction::~Geant4TrackingPostAction() {
  InstanceCount::decrement(this);
}

/// Begin-of-tracking callback
void Geant4TrackingPostAction::begin(const G4Track* track) {

  // Is the track valid? Is tracking manager valid?
  // Does trajectory already exist?
  if (0 == track || 0 == trackMgr() || 0 != trackMgr()->GimmeTrajectory())
    return;
  trackMgr()->SetStoreTrajectory(true);
  // create GaussTrajectory and inform Tracking Manager
  G4VTrajectory* tr = m_context->createTrajectory(track);
  trackMgr()->SetTrajectory(tr);
}

/// End-of-tracking callback
void Geant4TrackingPostAction::end(const G4Track* tr) {
  if (0 == tr)
    return;
  else if (0 == trackMgr())
    return;

  Geant4TrackHandler track(tr);
  //Geant4TrackInformation* info = track.info<Geant4TrackInformation>();
  const string& proc = track.creatorProcess()->GetProcessName();
  StringV::const_iterator trIt = find_if(m_ignoredProcs.begin(), m_ignoredProcs.end(), FindString(proc));
  if (trIt != m_ignoredProcs.end()) {
    warning("Particles created by processes of type %s are not kept!", (*trIt).c_str());
    return;
  }
  trIt = find_if(m_requiredProcs.begin(), m_requiredProcs.end(), FindString(proc));
  if (trIt != m_requiredProcs.end()) {
    saveTrack(track);
    return;
  }

  if (m_storeMarkedTracks) {
  }

}

void Geant4TrackingPostAction::saveTrack(const G4Track* track) {
  if (0 != track) {
  }
}