RectangularEtaPhiTrackingRegion.h

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#ifndef RectangularEtaPhiTrackingRegion_H
#define RectangularEtaPhiTrackingRegion_H

#include "RecoTracker/TkTrackingRegions/interface/TrackingRegion.h"
#include "RecoTracker/TkTrackingRegions/interface/TkTrackingRegionsMargin.h"
//#include "CommonDet/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
#include "RecoTracker/TkTrackingRegions/interface/HitRZConstraint.h"
#include "FWCore/Framework/interface/EventSetup.h"

#include "DataFormats/TrackerRecHit2D/interface/BaseTrackerRecHit.h"
#include "DataFormats/TrackingRecHit/interface/mayown_ptr.h"

class OuterHitPhiPrediction;
class BarrelDetLayer;
class ForwardDetLayer;
class MeasurementTrackerEvent;

class RectangularEtaPhiTrackingRegion final : public TrackingRegion {
public:
  enum class UseMeasurementTracker { kNever = -1, kForSiStrips = 0, kAlways = 1 };

  static UseMeasurementTracker intToUseMeasurementTracker(int value) {
    assert(value >= -1 && value <= 1);
    return static_cast<UseMeasurementTracker>(value);
  }

  static UseMeasurementTracker doubleToUseMeasurementTracker(double value) {
    // mimic the old behaviour
    if (value > 0.5)
      return UseMeasurementTracker::kAlways;
    if (value > -0.5)
      return UseMeasurementTracker::kForSiStrips;
    return UseMeasurementTracker::kNever;
  }

  static UseMeasurementTracker stringToUseMeasurementTracker(const std::string& name);

  RectangularEtaPhiTrackingRegion(RectangularEtaPhiTrackingRegion const& rh)
      : TrackingRegion(rh),
        theEtaRange(rh.theEtaRange),
        theLambdaRange(rh.theLambdaRange),
        thePhiMargin(rh.thePhiMargin),
        theMeanLambda(rh.theMeanLambda),
        theMeasurementTrackerUsage(rh.theMeasurementTrackerUsage),
        thePrecise(rh.thePrecise),
        theUseEtaPhi(rh.theUseEtaPhi),
        theMeasurementTracker(rh.theMeasurementTracker) {}

  RectangularEtaPhiTrackingRegion& operator=(RectangularEtaPhiTrackingRegion const&) = delete;
  RectangularEtaPhiTrackingRegion(RectangularEtaPhiTrackingRegion&&) = default;
  RectangularEtaPhiTrackingRegion& operator=(RectangularEtaPhiTrackingRegion&&) = delete;

  typedef TkTrackingRegionsMargin<float> Margin;

  RectangularEtaPhiTrackingRegion(const GlobalVector& dir,
                                  const GlobalPoint& vertexPos,
                                  float ptMin,
                                  float rVertex,
                                  float zVertex,
                                  float deltaEta,
                                  float deltaPhi,
                                  UseMeasurementTracker whereToUseMeasurementTracker = UseMeasurementTracker::kNever,
                                  bool precise = true,
                                  const MeasurementTrackerEvent* measurementTracker = nullptr,
                                  bool etaPhiRegion = false)
      : RectangularEtaPhiTrackingRegion(dir,
                                        vertexPos,
                                        Range(-1 / ptMin, 1 / ptMin),
                                        rVertex,
                                        zVertex,
                                        Margin(std::abs(deltaEta), std::abs(deltaEta)),
                                        Margin(std::abs(deltaPhi), std::abs(deltaPhi)),
                                        whereToUseMeasurementTracker,
                                        precise,
                                        measurementTracker,
                                        etaPhiRegion) {}

  RectangularEtaPhiTrackingRegion(const GlobalVector& dir,
                                  const GlobalPoint& vertexPos,
                                  float ptMin,
                                  float rVertex,
                                  float zVertex,
                                  Margin etaMargin,
                                  Margin phiMargin,
                                  UseMeasurementTracker whereToUseMeasurementTracker = UseMeasurementTracker::kNever,
                                  bool precise = true,
                                  const MeasurementTrackerEvent* measurementTracker = nullptr,
                                  bool etaPhiRegion = false)
      : RectangularEtaPhiTrackingRegion(dir,
                                        vertexPos,
                                        Range(-1 / ptMin, 1 / ptMin),
                                        rVertex,
                                        zVertex,
                                        etaMargin,
                                        phiMargin,
                                        whereToUseMeasurementTracker,
                                        precise,
                                        measurementTracker,
                                        etaPhiRegion) {}

  RectangularEtaPhiTrackingRegion(const GlobalVector& dir,
                                  const GlobalPoint& vertexPos,
                                  Range invPtRange,
                                  float rVertex,
                                  float zVertex,
                                  Margin etaMargin,
                                  Margin phiMargin,
                                  UseMeasurementTracker whereToUseMeasurementTracker = UseMeasurementTracker::kNever,
                                  bool precise = true,
                                  const MeasurementTrackerEvent* measurementTracker = nullptr,
                                  bool etaPhiRegion = false,
                                  bool useMS = true)
      : TrackingRegionBase(dir, vertexPos, invPtRange, rVertex, zVertex),
        thePhiMargin(phiMargin),
        theMeasurementTrackerUsage(whereToUseMeasurementTracker),
        thePrecise(precise),
        theUseMS(useMS),
        theUseEtaPhi(etaPhiRegion),
        theMeasurementTracker(measurementTracker) {
    initEtaRange(dir, etaMargin);
  }

  const Range& etaRange() const { return theEtaRange; }
  const Range& tanLambdaRange() const { return theLambdaRange; }

  const Margin& phiMargin() const { return thePhiMargin; }

  bool isPrecise() const { return thePrecise; }

  TrackingRegion::Hits hits(const edm::EventSetup& es, const SeedingLayerSetsHits::SeedingLayer& layer) const override;

  HitRZCompatibility* checkRZ(const DetLayer* layer,
                              const Hit& outerHit,
                              const edm::EventSetup& iSetup,
                              const DetLayer* outerlayer = nullptr,
                              float lr = 0,
                              float gz = 0,
                              float dr = 0,
                              float dz = 0) const override {
    return checkRZOld(layer, outerHit, iSetup, outerlayer);
  }

  RectangularEtaPhiTrackingRegion* clone() const override { return new RectangularEtaPhiTrackingRegion(*this); }

  std::string name() const override { return "RectangularEtaPhiTrackingRegion"; }
  std::string print() const override;

private:
  HitRZCompatibility* checkRZOld(const DetLayer* layer,
                                 const Hit& outerHit,
                                 const edm::EventSetup& iSetup,
                                 const DetLayer* outerlayer) const;

  std::unique_ptr<MeasurementEstimator> estimator(const BarrelDetLayer* layer,
                                                  const edm::EventSetup& iSetup) const dso_internal;
  std::unique_ptr<MeasurementEstimator> estimator(const ForwardDetLayer* layer,
                                                  const edm::EventSetup& iSetup) const dso_internal;

  OuterHitPhiPrediction phiWindow(const edm::EventSetup& iSetup) const dso_internal;
  HitRZConstraint rzConstraint() const dso_internal;

  void initEtaRange(const GlobalVector& dir, const Margin& margin);

private:
  Range theEtaRange;
  Range theLambdaRange;  // this is actually tanLambda
  Margin thePhiMargin;
  float theMeanLambda;
  const UseMeasurementTracker theMeasurementTrackerUsage = UseMeasurementTracker::kNever;
  bool thePrecise = false;
  bool theUseMS = false;
  bool theUseEtaPhi = false;
  const MeasurementTrackerEvent* theMeasurementTracker = nullptr;

  using cacheHitPointer = mayown_ptr<BaseTrackerRecHit>;
  using cacheHits = std::vector<cacheHitPointer>;

  /*  wait... think! 
   *  done? questions?  think again, look where this region is constructed
   *  still question? study tracker code for the next couple of weeks, then we may discuss.  
   */
  mutable cacheHits cache;
};

#endif