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 // This file is part of the ACTS project.
 //
 // Copyright (C) 2016 CERN for the benefit of the ACTS project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 #pragma once
 
 #include "Acts/Definitions/Algebra.hpp"
 #include "Acts/Utilities/Logger.hpp"
 
 #include <algorithm>
 #include <array>
 #include <cstddef>
 #include <cstdint>
 #include <limits>
 #include <span>
 #include <type_traits>
 
 namespace Acts {
 
 /// Status enum
 enum class IntersectionStatus : int {
   unreachable = 0,
   reachable = 1,
   onSurface = 2
 };
 
 /// Ostream-operator for the IntersectionStatus enum
 /// @param os Output stream
 /// @param status IntersectionStatus to output
 /// @return Reference to output stream
 inline std::ostream& operator<<(std::ostream& os, IntersectionStatus status) {
   constexpr static std::array<const char*, 3> names = {
       {"missed/unreachable", "reachable", "onSurface"}};
 
   os << names[static_cast<std::size_t>(status)];
   return os;
 }
 
 /// Intersection struct containing the position, path length and status of an
 /// intersection.
 template <unsigned int DIM>
 class Intersection {
  public:
   /// Position type
   using Position = Eigen::Map<const ActsVector<DIM>>;
 
   /// Constructor with arguments
   ///
   /// @param position is the position of the intersection
   /// @param pathLength is the path length to the intersection
   /// @param status is an enum indicating the status of the intersection
   constexpr Intersection(const ActsVector<DIM>& position, double pathLength,
                          IntersectionStatus status) noexcept
       : Intersection(std::span<const double, DIM>{position.data(), DIM},
                      pathLength, status) {}
 
   /// Constructor from position vector, path length, and status
   /// @param position The intersection position
   /// @param pathLength The path length to the intersection
   /// @param status The intersection status
   constexpr Intersection(const Position& position, double pathLength,
                          IntersectionStatus status) noexcept
       : Intersection(std::span<const double, DIM>{position.data(), DIM},
                      pathLength, status) {}
 
   /// Constructor from position span, path length, and status
   /// @param position Span of position coordinates
   /// @param pathLength The path length to the intersection
   /// @param status The intersection status
   constexpr Intersection(std::span<const double, DIM> position,
                          double pathLength, IntersectionStatus status) noexcept
       : m_pathLength(pathLength), m_status(status) {
     std::ranges::copy(position, m_position.begin());
   }
 
   /// Copy constructor
   constexpr Intersection(const Intersection&) noexcept = default;
   /// Move constructor
   constexpr Intersection(Intersection&&) noexcept = default;
   /// Copy assignment operator
   /// @return Reference to this intersection for chaining
   constexpr Intersection& operator=(const Intersection&) noexcept = default;
   /// Move assignment operator
   /// @return Reference to this intersection for chaining
   constexpr Intersection& operator=(Intersection&&) noexcept = default;
 
   /// Returns whether the intersection was successful or not
   /// @return True if intersection is reachable or on surface, false if unreachable
   constexpr bool isValid() const noexcept {
     return m_status != IntersectionStatus::unreachable;
   }
 
   /// Returns the position of the interseciton
   /// @return Position vector of the intersection point
   Position position() const noexcept { return Position{m_position.data()}; }
 
   /// Returns the path length to the intersection
   /// @return Signed path length from origin to intersection point
   constexpr double pathLength() const noexcept { return m_pathLength; }
 
   /// Returns the intersection status enum
   /// @return Status indicating if intersection is unreachable, reachable, or on surface
   constexpr IntersectionStatus status() const noexcept { return m_status; }
 
   /// Static factory to create an invalid intersection
   /// @return Invalid intersection with unreachable status
   constexpr static Intersection Invalid() noexcept { return Intersection(); }
 
   /// Comparison function for path length order i.e. intersection closest to
   /// -inf will be first.
   /// @param aIntersection First intersection to compare
   /// @param bIntersection Second intersection to compare
   /// @return True if first intersection has smaller path length than second
   constexpr static bool pathLengthOrder(
       const Intersection& aIntersection,
       const Intersection& bIntersection) noexcept {
     auto a = aIntersection.pathLength();
     auto b = bIntersection.pathLength();
     return a < b;
   }
 
   /// Comparison function for closest order i.e. intersection closest to 0 will
   /// be first.
   /// @param aIntersection First intersection to compare
   /// @param bIntersection Second intersection to compare
   /// @return True if first intersection is closer to zero path length than second
   constexpr static bool closestOrder(
       const Intersection& aIntersection,
       const Intersection& bIntersection) noexcept {
     using enum IntersectionStatus;
 
     if ((aIntersection.status() == unreachable) &&
         (bIntersection.status() != unreachable)) {
       return false;
     }
     if ((aIntersection.status() != unreachable) &&
         (bIntersection.status() == unreachable)) {
       return true;
     }
     // both are reachable or onSurface now
     auto a = aIntersection.pathLength();
     auto b = bIntersection.pathLength();
     return std::abs(a) < std::abs(b);
   }
 
   /// Comparison function for closest forward order i.e. intersection closest to
   /// 0 with positive path length will be first.
   /// @param aIntersection First intersection to compare
   /// @param bIntersection Second intersection to compare
   /// @return True if first intersection is closer to zero with preference for forward direction
   constexpr static bool closestForwardOrder(
       const Intersection& aIntersection,
       const Intersection& bIntersection) noexcept {
     auto a = aIntersection.pathLength();
     auto b = bIntersection.pathLength();
     return std::signbit(a) == std::signbit(b) ? std::abs(a) < std::abs(b)
                                               : a > b;
   }
 
  private:
   /// Position of the intersection
   std::array<double, DIM> m_position{};
   /// Signed path length to the intersection (if valid)
   double m_pathLength = std::numeric_limits<double>::infinity();
   /// The Status of the intersection
   IntersectionStatus m_status = IntersectionStatus::unreachable;
 
   constexpr Intersection() noexcept = default;
 };
 
 /// Type alias for 2D intersection
 using Intersection2D = Intersection<2>;
 /// Type alias for 3D intersection
 using Intersection3D = Intersection<3>;
 
 static_assert(std::is_trivially_copy_constructible_v<Intersection2D>);
 static_assert(std::is_trivially_move_constructible_v<Intersection2D>);
 static_assert(std::is_trivially_move_assignable_v<Intersection2D>);
 
 using IntersectionIndex = std::uint8_t;
 static constexpr IntersectionIndex s_maximumNumberOfIntersections = 2;
 
 template <unsigned int DIM>
 class MultiIntersection {
  public:
   using IntersectionType = Intersection<DIM>;
   using IndexedIntersection = std::pair<IntersectionType, IntersectionIndex>;
 
   using Container =
       std::array<IntersectionType, s_maximumNumberOfIntersections>;
 
   using size_type = IntersectionIndex;
 
   constexpr explicit MultiIntersection(
       const IntersectionType& intersection) noexcept
       : m_intersections{intersection, IntersectionType::Invalid()}, m_size{1} {}
   constexpr MultiIntersection(const IntersectionType& intersection1,
                               const IntersectionType& intersection2) noexcept
       : m_intersections{intersection1, intersection2}, m_size{2} {}
 
   constexpr MultiIntersection(const MultiIntersection&) noexcept = default;
   constexpr MultiIntersection(MultiIntersection&&) noexcept = default;
   constexpr MultiIntersection& operator=(const MultiIntersection&) noexcept =
       default;
   constexpr MultiIntersection& operator=(MultiIntersection&&) noexcept =
       default;
 
   constexpr const IntersectionType& operator[](IntersectionIndex index) const {
     return m_intersections[index];
   }
 
   constexpr const IntersectionType& at(IntersectionIndex index) const {
     return m_intersections.at(index);
   }
 
   constexpr IntersectionIndex size() const noexcept { return m_size; }
 
   constexpr auto begin() const noexcept {
     return std::span(m_intersections.data(), m_size).begin();
   }
   constexpr auto end() const noexcept {
     return std::span(m_intersections.data(), m_size).end();
   }
 
   constexpr IntersectionType closest() const noexcept {
     return closestWithIndex().first;
   }
   constexpr IndexedIntersection closestWithIndex() const noexcept {
     auto min = std::ranges::min_element(m_intersections,
                                         IntersectionType::closestOrder);
     return {*min, static_cast<IntersectionIndex>(
                       std::distance(m_intersections.begin(), min))};
   }
 
   constexpr IntersectionType closestForward() const noexcept {
     return closestForwardWithIndex().first;
   }
   constexpr IndexedIntersection closestForwardWithIndex() const noexcept {
     auto min = std::ranges::min_element(m_intersections,
                                         IntersectionType::closestForwardOrder);
     return {*min, static_cast<IntersectionIndex>(
                       std::distance(m_intersections.begin(), min))};
   }
 
  private:
   Container m_intersections{};
   IntersectionIndex m_size{};
 };
 
 using MultiIntersection2D = MultiIntersection<2>;
 using MultiIntersection3D = MultiIntersection<3>;
 
 static_assert(std::is_trivially_copy_constructible_v<MultiIntersection2D>);
 static_assert(std::is_trivially_move_constructible_v<MultiIntersection2D>);
 static_assert(std::is_trivially_move_assignable_v<MultiIntersection2D>);
 
 namespace detail {
 
 /// This function checks if an intersection path length is valid for the
 /// specified near-limit and far-limit
 ///
 /// @param pathLength The path length of the intersection
 /// @param nearLimit The minimum path length for an intersection to be considered
 /// @param farLimit The maximum path length for an intersection to be considered
 /// @param logger A optionally supplied logger which prints out a lot of infos
 ///               at VERBOSE level
 bool checkPathLength(double pathLength, double nearLimit, double farLimit,
                      const Logger& logger = getDummyLogger());
 
 }  // namespace detail
 
 }  // namespace Acts

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