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/** \class HLTSinglet
 *
 * See header file for documentation
 *
 *
 *  \author Martin Grunewald
 *
 */

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/Ref.h"
#include "DataFormats/L1Trigger/interface/L1EmParticle.h"
#include "DataFormats/L1Trigger/interface/L1EtMissParticle.h"
#include "DataFormats/L1Trigger/interface/L1JetParticle.h"
#include "DataFormats/HLTReco/interface/TriggerFilterObjectWithRefs.h"

#include "HLTSinglet.h"

#include "HLTrigger/HLTcore/interface/defaultModuleLabel.h"

// extract the candidate type
template <typename T>
int getObjectType(const T&) {
  return 0;
}

// specialize for type l1extra::L1EmParticle
template <typename T>
int getObjectType(const l1extra::L1EmParticle& candidate) {
  switch (candidate.type()) {
    case l1extra::L1EmParticle::kIsolated:
      return trigger::TriggerL1IsoEG;
    case l1extra::L1EmParticle::kNonIsolated:
      return trigger::TriggerL1NoIsoEG;
    default:
      return 0;
  }
}

// specialize for type l1extra::L1EtMissParticle
template <typename T>
int getObjectType(const l1extra::L1EtMissParticle& candidate) {
  switch (candidate.type()) {
    case l1extra::L1EtMissParticle::kMET:
      return trigger::TriggerL1ETM;
    case l1extra::L1EtMissParticle::kMHT:
      return trigger::TriggerL1HTM;
    default:
      return 0;
  }
}

// specialize for type l1extra::L1JetParticle
template <typename T>
int getObjectType(const l1extra::L1JetParticle& candidate) {
  switch (candidate.type()) {
    case l1extra::L1JetParticle::kCentral:
      return trigger::TriggerL1CenJet;
    case l1extra::L1JetParticle::kForward:
      return trigger::TriggerL1ForJet;
    case l1extra::L1JetParticle::kTau:
      return trigger::TriggerL1TauJet;
    default:
      return 0;
  }
}

//
// constructors and destructor
//
template <typename T>
HLTSinglet<T>::HLTSinglet(const edm::ParameterSet& iConfig)
    : HLTFilter(iConfig),
      inputTag_(iConfig.template getParameter<edm::InputTag>("inputTag")),
      inputToken_(consumes<std::vector<T>>(inputTag_)),
      triggerType_(iConfig.template getParameter<int>("triggerType")),
      min_N_(iConfig.template getParameter<int>("MinN")),
      min_E_(iConfig.template getParameter<double>("MinE")),
      min_Pt_(iConfig.template getParameter<double>("MinPt")),
      min_Mass_(iConfig.template getParameter<double>("MinMass")),
      max_Mass_(iConfig.template getParameter<double>("MaxMass")),
      min_Eta_(iConfig.template getParameter<double>("MinEta")),
      max_Eta_(iConfig.template getParameter<double>("MaxEta")) {
  LogDebug("") << "Input/ptcut/etacut/ncut : " << inputTag_.encode() << " " << min_E_ << " " << min_Pt_ << " "
               << min_Mass_ << " " << max_Mass_ << " " << min_Eta_ << " " << max_Eta_ << " " << min_N_;
}

template <typename T>
HLTSinglet<T>::~HLTSinglet() = default;

template <typename T>
void HLTSinglet<T>::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  edm::ParameterSetDescription desc;
  makeHLTFilterDescription(desc);
  desc.add<edm::InputTag>("inputTag", edm::InputTag("hltCollection"));
  desc.add<int>("triggerType", 0);
  desc.add<double>("MinE", -1.0);
  desc.add<double>("MinPt", -1.0);
  desc.add<double>("MinMass", -1.0);
  desc.add<double>("MaxMass", -1.0);
  desc.add<double>("MinEta", -1.0);
  desc.add<double>("MaxEta", -1.0);
  desc.add<int>("MinN", 1);
  descriptions.add(defaultModuleLabel<HLTSinglet<T>>(), desc);
}

//
// member functions
//

// ------------ method called to produce the data  ------------
template <typename T>
bool HLTSinglet<T>::hltFilter(edm::Event& iEvent,
                              const edm::EventSetup& iSetup,
                              trigger::TriggerFilterObjectWithRefs& filterproduct) const {
  using namespace std;
  using namespace edm;
  using namespace reco;
  using namespace trigger;

  typedef vector<T> TCollection;
  typedef Ref<TCollection> TRef;

  // All HLT filters must create and fill an HLT filter object,
  // recording any reconstructed physics objects satisfying (or not)
  // this HLT filter, and place it in the Event.

  // The filter object
  if (saveTags())
    filterproduct.addCollectionTag(inputTag_);

  // Ref to Candidate object to be recorded in filter object
  TRef ref;

  // get hold of collection of objects
  Handle<TCollection> objects;
  iEvent.getByToken(inputToken_, objects);

  // look at all objects, check cuts and add to filter object
  int n(0);
  typename TCollection::const_iterator i(objects->begin());
  for (; i != objects->end(); i++) {
    if ((i->energy() >= min_E_) && (i->pt() >= min_Pt_) && (i->mass() >= min_Mass_) &&
        ((max_Mass_ < 0.0) || (i->mass() <= max_Mass_)) && ((min_Eta_ < 0.0) || (std::abs(i->eta()) >= min_Eta_)) &&
        ((max_Eta_ < 0.0) || (std::abs(i->eta()) <= max_Eta_))) {
      n++;
      ref = TRef(objects, distance(objects->begin(), i));
      int tid = getObjectType<T>(*i);
      if (tid == 0)
        tid = triggerType_;
      filterproduct.addObject(tid, ref);
    }
  }

  // filter decision
  bool accept(n >= min_N_);

  return accept;
}