Trigger.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// contact: jmaurer@cern.ch
 
#ifndef TRIGGLOBALEFFICIENCYCORRECTION_TRIGGER_H
#define TRIGGLOBALEFFICIENCYCORRECTION_TRIGGER_H 1
 
#include <algorithm>
#include <array>
#include <type_traits>
 
#include "TrigGlobalEfficiencyCorrection/ImportData.h"
#include "xAODBase/ObjectType.h"
#include <flat_set>
 
namespace TrigGlobEffCorr {
 
class UnusedArg {
 public:
  static constexpr xAOD::Type::ObjectType object() { return xAOD::Type::Other; }
};
 
class TriggerProperties {
 public:
  explicit constexpr TriggerProperties(TriggerType tt) : m_type(tt), m_legs{} {}
  explicit TriggerProperties(const ImportData::TrigDef& def)
      : m_type(def.type) {
    loadLegs(def, m_legs);
  }
  constexpr TriggerType type() const { return m_type; }
  constexpr bool valid() const {
    return !((m_type & TT_MASK_FLAVOUR) &
             ~(TT_ELECTRON_FLAG | TT_MUON_FLAG |
               TT_PHOTON_FLAG));  
  }
  constexpr bool mixed() const {
    auto x = m_type & TT_MASK_FLAVOUR;
    return (x != TT_ELECTRON_FLAG) && (x != TT_MUON_FLAG) &&
           (x != TT_PHOTON_FLAG);
  }
  constexpr unsigned nDistinctLegs() const {
    auto x = m_type & TT_MASK_SYMMETRY;
    if (m_type & TT_SINGLELEPTON_FLAG)
      return 1;
    else if (m_type & TT_DILEPTON_FLAG)
      return 2 - 1 * (x == TT_SYM);
    else if (m_type & TT_TRILEPTON_FLAG)
      return (x == TT_ASYM) ? 3 : 1 + 1 * (mixed() || (x != TT_SYM));
    else if ((m_type & TT_TETRALEPTON_FLAG) && x == TT_SYM)
      return 1;
    return 0;
  }
  constexpr unsigned nDistinctLegs(xAOD::Type::ObjectType obj) const {
    bool firstPos = true;
    switch (obj) {
      case xAOD::Type::Electron:
        if (!(m_type & TT_ELECTRON_FLAG))
          return 0;
        break;
      case xAOD::Type::Muon:
        if (!(m_type & TT_MUON_FLAG))
          return 0;
        firstPos = (m_type & TT_PHOTON_FLAG);
        break;
      case xAOD::Type::Photon:
        if (!(m_type & TT_PHOTON_FLAG))
          return 0;
        firstPos = false;
        break;
      default:
        return 0;
    }
    if (!mixed())
      return nDistinctLegs();
    return (firstPos == (m_type & TT_X2Y_FLAG)) ? 1 : nDistinctLegs() - 1;
  }
  template <typename Array>
  void loadLegs(const ImportData::TrigDef& src, Array& dest) {
    if (src.type != m_type)
      throw std::runtime_error(
          "Calculator bug");  
    std::fill(dest.begin(), dest.end(), 0);
    if (m_type == TT_2E_MU_SYM || m_type == TT_2E_G_SYM ||
        m_type == TT_2MU_G_SYM)  
    {
      dest[0] = src.leg[0];
      dest[1] = src.leg[2];
    } else  
    {
      std::copy_n(src.leg.cbegin(), nDistinctLegs(), dest.begin());
    }
  }
 
  constexpr int cbegin_offset(xAOD::Type::ObjectType obj) const {
    return (obj != xAOD::Type::Electron) *
           (nDistinctLegs(xAOD::Type::Electron) +
            (obj != xAOD::Type::Muon) * nDistinctLegs(xAOD::Type::Muon));
  }
 
  constexpr auto cbegin(xAOD::Type::ObjectType obj) const {
    return m_legs.cbegin() + cbegin_offset(obj);
  }
 
  constexpr int cend_offset(xAOD::Type::ObjectType obj) const {
    return -((obj != xAOD::Type::Photon) *
             (nDistinctLegs(xAOD::Type::Photon) +
              (obj != xAOD::Type::Muon) * nDistinctLegs(xAOD::Type::Muon)));
  }
 
  constexpr auto cend(xAOD::Type::ObjectType obj) const {
    return m_legs.cbegin() + nDistinctLegs() + cend_offset(obj);
  }
 
 protected:
  TriggerType m_type;
  std::array<std::size_t, 4> m_legs;
};
 
template <TriggerType tt, typename CastType1 = UnusedArg,
          typename CastType2 = UnusedArg>
class Trigger {
  static_assert(TriggerProperties(tt).valid(), "trigger type not supported");
 
 private:
  static constexpr bool extraCheck(xAOD::Type::ObjectType obj) {
    return (object() == obj || obj == xAOD::Type::Other);
  }
  template <typename T>
  struct Optional {};
 
 public:
  static constexpr TriggerType type() { return tt; }
 
  static constexpr bool mixed() { return TriggerProperties(tt).mixed(); }
 
  static constexpr unsigned nDistinctLegs() {
    return TriggerProperties(tt).nDistinctLegs();
  }
 
  static constexpr unsigned nDistinctLegs(xAOD::Type::ObjectType obj) {
    return TriggerProperties(tt).nDistinctLegs(obj);
  }
 
  static constexpr xAOD::Type::ObjectType object1() {
    if (!is3Lmix()) {
      if (tt & TT_ELECTRON_FLAG)
        return xAOD::Type::Electron;
      if (tt & TT_MUON_FLAG)
        return xAOD::Type::Muon;
      if (tt & TT_PHOTON_FLAG)
        return xAOD::Type::Photon;
      return xAOD::Type::Other;
    }
    if ((tt & TT_ELECTRON_FLAG) && !(tt & TT_X2Y_FLAG))
      return xAOD::Type::Electron;
    if ((tt & TT_PHOTON_FLAG) && (tt & TT_X2Y_FLAG))
      return xAOD::Type::Photon;
    return (tt & TT_MUON_FLAG) ? xAOD::Type::Muon : xAOD::Type::Other;
  }
 
  static constexpr xAOD::Type::ObjectType object2() {
    if (is2Lmix()) {
      if ((tt & TT_ELECTRON_FLAG) && (tt & TT_MUON_FLAG))
        return xAOD::Type::Muon;
      if ((tt & (TT_ELECTRON_FLAG | TT_MUON_FLAG)) && (tt & TT_PHOTON_FLAG))
        return xAOD::Type::Photon;
      return xAOD::Type::Other;
    } else if (!is3Lmix())
      return xAOD::Type::Other;
    if ((tt & TT_ELECTRON_FLAG) && (tt & TT_X2Y_FLAG))
      return xAOD::Type::Electron;
    if ((tt & TT_PHOTON_FLAG) && !(tt & TT_X2Y_FLAG))
      return xAOD::Type::Photon;
    return (tt & TT_MUON_FLAG) ? xAOD::Type::Muon : xAOD::Type::Other;
  }
 
  static constexpr xAOD::Type::ObjectType object() {
    if (mixed())
      return xAOD::Type::Other;
    return object1();
  }
 
  static bool relevantFor(const Lepton& lepton) {
    return lepton.type() == object();
  }
  static bool irrelevantFor(const Lepton& lepton) {
    return !relevantFor(lepton);
  }
 
  static constexpr bool is1L() { return (tt & TT_SINGLELEPTON_FLAG); }
  static constexpr bool is2Lnomix() {
    return (tt & TT_DILEPTON_FLAG) && !mixed();
  }
  static constexpr bool is2Lasym() {
    return ((tt & TT_MASK_TYPE) == TT_DILEPTON_ASYM);
  }
  static constexpr bool is2Lsym() {
    return ((tt & TT_MASK_TYPE) == TT_DILEPTON_SYM);
  }
  static constexpr bool is3Lsym() {
    return ((tt & TT_MASK_TYPE) == TT_TRILEPTON_SYM) && !mixed();
  }
  static constexpr bool is3Lhalfsym() {
    return ((tt & TT_MASK_TYPE) == TT_TRILEPTON_HALFSYM) && !mixed();
  }
  static constexpr bool is2Lmix() { return (tt & TT_DILEPTON_FLAG) && mixed(); }
  static constexpr bool is3Lmix() {
    return (tt & TT_TRILEPTON_FLAG) && mixed();
  }
  static constexpr bool is4Lsym() {
    return ((tt & TT_MASK_TYPE) == TT_TETRALEPTON_SYM);
  }
 
  std::array<std::size_t, nDistinctLegs()> legs;
 
  explicit Trigger() { std::fill(legs.begin(), legs.end(), 0); }
 
  Trigger(const ImportData::TrigDef& def)
    : Trigger()
  {
    TriggerProperties(tt).loadLegs(def, legs);
  }
 
  void setDefinition(const ImportData::TrigDef& def) {
    TriggerProperties(tt).loadLegs(def, legs);
  }
 
  template <bool = true>
  std::size_t operator()(void) const {
    static_assert(nDistinctLegs() == 1,
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    return legs[0];
  }
 
  std::size_t operator()(unsigned index) const { return legs[index]; }
 
  template <bool = true>
  std::size_t operator<(const Trigger& rhs) const {
    static_assert(is1L(),
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    return legs[0] < rhs.legs[0];
  }
 
  explicit operator bool() const {
    return std::all_of(legs.cbegin(), legs.cend(),
                       [](std::size_t x) -> bool { return x; });
  }
 
  bool operator==(const Trigger& rhs) const { return legs == rhs.legs; }
 
  template <xAOD::Type::ObjectType obj = object()>
  constexpr auto cbegin() const {
    return legs.cbegin() + TriggerProperties(tt).cbegin_offset(obj);
  }
 
  template <xAOD::Type::ObjectType obj = object()>
  constexpr auto cend() const {
    return legs.cend() + TriggerProperties(tt).cend_offset(obj);
  }
 
  template <typename Trig1L>
  auto hiddenBy(const Trig1L trig) const ->
      typename std::enable_if<Trig1L::is1L(), bool>::type {
    static_assert(Trig1L::is1L(),
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    constexpr auto obj = Trig1L::object();
    return std::find(cbegin<obj>(), cend<obj>(), trig()) != cend<obj>();
  }
 
  template <typename Trig1L>
  auto hiddenBy(const std::flat_set<Trig1L>& trigs) const ->
      typename std::enable_if<Trig1L::is1L(), bool>::type {
    static_assert(Trig1L::is1L(),
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    return std::any_of(trigs.cbegin(), trigs.cend(),
                       [&](Trig1L t) -> bool { return hiddenBy(t); });
  }

  template <xAOD::Type::ObjectType obj, bool anti = false>
  auto side() const -> std::conditional_t<anti ^ (CastType1::object() == obj),
                                          CastType1, CastType2> {
    static_assert(mixed(),
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    static_assert(obj != xAOD::Type::Other, "implementation incomplete");
    using CastType = decltype(side<obj, anti>());
    CastType trig;
    std::copy_n(this->cbegin<CastType::object()>(),
                nDistinctLegs(CastType::object()), trig.legs.begin());
    return trig;
  }

  template <typename TrigX>
  auto side() const -> decltype(side<TrigX::object()>()) {
    return side<TrigX::object()>();
  }

  template <typename TrigX>
  auto antiside() const -> decltype(side<TrigX::object(), true>()) {
    return side<TrigX::object(), true>();
  }

  CastType1 side1() const { return side<CastType1::object()>(); }
  CastType2 side2() const { return side<CastType2::object()>(); }
 
  template <typename Trig1L>
  auto addTo(const std::flat_set<Trig1L>& trigs1L) const
      -> std::enable_if_t<Trig1L::is1L() &&
                              nDistinctLegs(Trig1L::object()) == 1,
                          std::flat_set<Trig1L>> {
    static_assert(mixed(),
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    std::flat_set<Trig1L> trigs(trigs1L);
    trigs.insert(side<Trig1L>());
    return trigs;
  }
 
  template <typename Trig1L>
  static auto anonymize(const std::flat_set<Trig1L>& triggers)
      -> std::enable_if_t<is1L() && tt == Trig1L::type(),
                          const std::flat_set<std::size_t>&> {
    static_assert(sizeof(Trig1L) == sizeof(std::size_t),
                  "invalid cast if the key sizes differ");
    return reinterpret_cast<const std::flat_set<std::size_t>&>(triggers);
  }
 
  template <bool = true>
  bool symmetric() const {
    static_assert(!std::is_same<CastType1, UnusedArg>::value,
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    return std::all_of(legs.cbegin() + 1, legs.cend(),
                       [&](std::size_t l) -> bool { return l == legs[0]; });
  }
 
  template <bool = true>
  CastType1 to_symmetric() const {
    static_assert(!std::is_same<CastType1, UnusedArg>::value,
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    CastType1 trig;
    trig.legs[0] = this->legs[0];
    return trig;
  }
 
  template <bool = true>
  std::size_t asymLeg() const {
    static_assert((tt & TT_MASK_SYMMETRY) == TT_HALFSYM,
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    return legs[0];
  }
 
  template <bool = true>
  std::size_t symLeg() const {
    static_assert((tt & TT_MASK_SYMMETRY) == TT_HALFSYM,
                  "this function is not meaningful for this type of trigger, "
                  "hence should not be used.");
    return legs[1];
  }
};
 
template <TriggerType, TriggerType = TT_UNKNOWN>
struct TriggerClass;
 
template <TriggerType object_flag>
struct TriggerClass<object_flag, TT_UNKNOWN> {
  static constexpr auto addObjFlag(int tt) {
    return static_cast<TriggerType>(tt | object_flag);
  }

  struct T_1 : public Trigger<addObjFlag(TT_SINGLELEPTON_FLAG)> {};
  struct T_2sym : public Trigger<addObjFlag(TT_DILEPTON_SYM)> {};
  struct T_2asym : public Trigger<addObjFlag(TT_DILEPTON_ASYM), T_2sym> {};
  struct T_3sym : public Trigger<addObjFlag(TT_TRILEPTON_SYM)> {};
  struct T_3halfsym : public Trigger<addObjFlag(TT_TRILEPTON_HALFSYM), T_3sym> {
  };

  struct T_4sym : public Trigger<addObjFlag(TT_TETRALEPTON_SYM)> {};
};
 
template <TriggerType object1_flag, TriggerType object2_flag>
struct TriggerClass {
  using A = TriggerClass<object1_flag>;
  using B = TriggerClass<object2_flag>;
  static constexpr auto addObjFlags(int tt) {
    return static_cast<TriggerType>(tt | object1_flag | object2_flag);
  }

  struct T_1_1 : public Trigger<addObjFlags(TT_DILEPTON_FLAG), typename A::T_1,
                                typename B::T_1> {};

  struct T_2sym_1 : public Trigger<addObjFlags(TT_TRILEPTON_SYM),
                                   typename A::T_2sym, typename B::T_1> {};

  struct T_2asym_1 : public Trigger<addObjFlags(TT_TRILEPTON_ASYM),
                                    typename A::T_2asym, typename B::T_1> {};

  struct T_1_2sym : public Trigger<addObjFlags(TT_TRILEPTON_SYM | TT_X2Y_FLAG),
                                   typename A::T_1, typename B::T_2sym> {};

  struct T_1_2asym : public Trigger<addObjFlags(TT_TRILEPTON_SYM | TT_X2Y_FLAG),
                                    typename A::T_1, typename B::T_2asym> {};
};
 
}  // namespace TrigGlobEffCorr
 
#endif