ExpectedHitUtils.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef ACTSTRK_EXPECTEDHITUTILS_H
#define ACTSTRK_EXPECTEDHITUTILS_H
 
#include "ActsGeometry/ActsDetectorElement.h"
#include "GaudiKernel/EventContext.h"
#include "Acts/Surfaces/CylinderSurface.hpp"
#include "Acts/EventData/BoundTrackParameters.hpp"
#include "ActsGeometryInterfaces/IExtrapolationTool.h"
#include <Acts/EventData/ProxyAccessor.hpp>
#include <array>
 
class ActsDetectorElement;
 
namespace ActsTrk::detail {

  struct ExpectedLayerPatternHelper {
    inline static const std::string_view kExpectedLayerPatternColumnName = "expectedLayerPattern";
 
    inline static const std::string kPixelBarrel = std::string{kExpectedLayerPatternColumnName}+"_PixelBarrel";
    inline static const std::string kPixelEndcap = std::string{kExpectedLayerPatternColumnName}+"_PixelEndcap";
    inline static const std::string kStripBarrel = std::string{kExpectedLayerPatternColumnName}+"_StripBarrel";
    inline static const std::string kStripEndcap = std::string{kExpectedLayerPatternColumnName}+"_StripEndcap";
 
 
    template <typename track_container_t>
    static void add(track_container_t& trackContainer) {
      trackContainer.template addColumn<unsigned int>(kPixelBarrel);
      trackContainer.template addColumn<unsigned int>(kPixelEndcap);
      trackContainer.template addColumn<unsigned int>(kStripBarrel);
      trackContainer.template addColumn<unsigned int>(kStripEndcap);
    }
 
    template <typename track_container_t>
    static bool exists(track_container_t& trackContainer) {
      return trackContainer.hasColumn(kPixelBarrel) 
        && trackContainer.hasColumn(kPixelEndcap)
        && trackContainer.hasColumn(kStripBarrel)
        && trackContainer.hasColumn(kStripEndcap);
    }
    
    template <typename track_proxy_t>
    static void set(track_proxy_t& track, std::array<unsigned int, 4> values) {
      static const Acts::ProxyAccessor<unsigned int> pixelBarrel{kPixelBarrel};
      static const Acts::ProxyAccessor<unsigned int> pixelEndcap{kPixelEndcap};
      static const Acts::ProxyAccessor<unsigned int> stripBarrel{kStripBarrel};
      static const Acts::ProxyAccessor<unsigned int> stripEndcap{kStripEndcap};
      pixelBarrel(track) = values.at(0);
      pixelEndcap(track) = values.at(1);
      stripBarrel(track) = values.at(2);
      stripEndcap(track) = values.at(3);
    }
 
    template <typename track_proxy_t>
    static std::array<unsigned int, 4> get(const track_proxy_t& track) {
      static const Acts::ConstProxyAccessor<unsigned int> pixelBarrel{kPixelBarrel};
      static const Acts::ConstProxyAccessor<unsigned int> pixelEndcap{kPixelEndcap};
      static const Acts::ConstProxyAccessor<unsigned int> stripBarrel{kStripBarrel};
      static const Acts::ConstProxyAccessor<unsigned int> stripEndcap{kStripEndcap};
 
      return {
        pixelBarrel(track),
        pixelEndcap(track),
        stripBarrel(track),
        stripEndcap(track)
      };
    }
 
  };
 

  std::array<unsigned int,4> expectedLayerPattern(const EventContext& ctx,
                                                  const ActsTrk::IExtrapolationTool &extrapolator,
                                                  const Acts::BoundTrackParameters& perigee_parameters,
                                                  double pathLimit);

  std::array<unsigned int,4> expectedLayerPattern(std::span<const ActsDetectorElement*> detectorElements);
 
  void addToExpectedLayerPattern(std::array<unsigned int,4>& pattern, const ActsDetectorElement& detElement);
}
 
#endif