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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/Common.hpp"
 #include "Acts/Definitions/TrackParametrization.hpp"
 #include "Acts/EventData/BoundTrackParameters.hpp"
 #include "Acts/EventData/MultiTrajectory.hpp"
 #include "Acts/EventData/TrackContainerFrontendConcept.hpp"
 #include "Acts/EventData/VectorMultiTrajectory.hpp"
 #include "Acts/EventData/detail/CorrectedTransformationFreeToBound.hpp"
 #include "Acts/Geometry/GeometryContext.hpp"
 #include "Acts/MagneticField/MagneticFieldContext.hpp"
 #include "Acts/Propagator/ActorList.hpp"
 #include "Acts/Propagator/DirectNavigator.hpp"
 #include "Acts/Propagator/PropagatorOptions.hpp"
 #include "Acts/Propagator/StandardAborters.hpp"
 #include "Acts/Propagator/detail/LoopProtection.hpp"
 #include "Acts/Propagator/detail/PointwiseMaterialInteraction.hpp"
 #include "Acts/Utilities/CalibrationContext.hpp"
 #include "Acts/Utilities/Logger.hpp"
 #include "Acts/Utilities/Result.hpp"
 
 #include <memory>
 #include <vector>
 
 namespace Acts::Experimental {
 
 /// @tparam traj_t The trajectory type
 template <typename traj_t>
 struct ReferenceTrajectoryBuilderOptions {
   /// PropagatorOptions with context.
   ///
   /// @param gctx The geometry context
   /// @param mctx The magnetic context
   /// @param pOptions The plain propagator options
   /// @param tSurface The target surface for the fit
   /// @param mScattering Whether to include multiple scattering
   /// @param eLoss Whether to include energy loss
   /// @param freeToBoundCorrection_ Correction for non-linearity effect during transform from free to bound
   ReferenceTrajectoryBuilderOptions(
       const GeometryContext& gctx, const MagneticFieldContext& mctx,
       const PropagatorPlainOptions& pOptions, const Surface* tSurface = nullptr,
       bool mScattering = true, bool eLoss = true,
       const FreeToBoundCorrection& freeToBoundCorrection_ =
           FreeToBoundCorrection(false))
       : geoContext(gctx),
         magFieldContext(mctx),
         propagatorPlainOptions(pOptions),
         referenceSurface(tSurface),
         multipleScattering(mScattering),
         energyLoss(eLoss),
         freeToBoundCorrection(freeToBoundCorrection_) {}
 
   /// Context object for the geometry
   std::reference_wrapper<const GeometryContext> geoContext;
   /// Context object for the magnetic field
   std::reference_wrapper<const MagneticFieldContext> magFieldContext;
 
   /// The trivial propagator options
   PropagatorPlainOptions propagatorPlainOptions;
 
   /// The reference surface
   const Surface* referenceSurface = nullptr;
 
   /// Whether to consider multiple scattering
   bool multipleScattering = true;
 
   /// Whether to consider energy loss
   bool energyLoss = true;
 
   /// Whether to include non-linear correction during global to local
   /// transformation
   FreeToBoundCorrection freeToBoundCorrection;
 };
 
 /// The result struct for the reference trajectory builder actor
 template <typename traj_t>
 struct ReferenceTrajectoryBuilderResult {
   /// The trajectory being built
   traj_t* trajectory{nullptr};
 
   /// The index of the last track state added to the trajectory
   std::size_t lastTrackStateIndex = kTrackIndexInvalid;
 
   /// The track parameters at the target surface if the target surface is
   /// reached
   std::optional<BoundTrackParameters> referenceParameters;
 
   /// Whether the reference trajectory building is finished
   bool finished = false;
 
   /// Path limit aborter
   PathLimitReached pathLimitReached;
 };
 
 /// Reference trajectory implementation.
 template <typename propagator_t, typename traj_t>
 class ReferenceTrajectoryBuilder {
   /// The navigator type
   using NavigatorType = typename propagator_t::Navigator;
 
   /// The navigator has DirectNavigator type or not
   static constexpr bool isDirectNavigator =
       std::is_same_v<NavigatorType, DirectNavigator>;
 
   /// The result type of the actor
   using ResultType = ReferenceTrajectoryBuilderResult<traj_t>;
 
  public:
   /// The options struct for the reference trajectory builder
   using Options = ReferenceTrajectoryBuilderOptions<traj_t>;
 
   /// Type alias for track state proxy from trajectory
   using TrackStateProxy = typename traj_t::TrackStateProxy;
 
   /// Type alias for const track state proxy from trajectory
   using ConstTrackStateProxy = typename traj_t::ConstTrackStateProxy;
 
   /// Constructor with propagator and logger
   /// @param pPropagator Propagator instance for track propagation
   /// @param _logger Logger for diagnostic output
   explicit ReferenceTrajectoryBuilder(
       propagator_t pPropagator,
       std::unique_ptr<const Logger> _logger =
           getDefaultLogger("ReferenceTrajectoryBuilder", Logging::INFO))
       : m_propagator(std::move(pPropagator)),
         m_logger{std::move(_logger)},
         m_actorLogger{m_logger->cloneWithSuffix("Actor")} {}
 
  private:
   /// The propagator for the transport and material update
   propagator_t m_propagator;
 
   /// The logger instance
   std::unique_ptr<const Logger> m_logger;
   /// The logger instance for the actor
   std::unique_ptr<const Logger> m_actorLogger;
 
   /// Logger helper
   const Logger& logger() const { return *m_logger; }
 
   class Actor {
    public:
     /// Broadcast the result_type
     using result_type = ResultType;
 
     /// The target surface aborter
     SurfaceReached targetReached{std::numeric_limits<double>::lowest()};
 
     /// Whether to consider multiple scattering.
     bool multipleScattering = true;
 
     /// Whether to consider energy loss.
     bool energyLoss = true;
 
     /// Whether to include non-linear correction during global to local
     /// transformation
     FreeToBoundCorrection freeToBoundCorrection;
 
     /// End of world aborter
     EndOfWorldReached endOfWorldReached;
 
     /// Volume constraint aborter
     VolumeConstraintAborter volumeConstraintAborter;
 
     /// The logger instance
     const Logger* actorLogger{nullptr};
 
     /// Logger helper
     const Logger& logger() const { return *actorLogger; }
 
     /// Actor operation
     ///
     /// @tparam propagator_state_t is the type of Propagator state
     /// @tparam stepper_t Type of the stepper
     /// @tparam navigator_t Type of the navigator
     ///
     /// @param state is the mutable propagator state object
     /// @param stepper The stepper in use
     /// @param navigator The navigator in use
     /// @param result is the mutable result state object
     template <typename propagator_state_t, typename stepper_t,
               typename navigator_t>
     Result<void> act(propagator_state_t& state, const stepper_t& stepper,
                      const navigator_t& navigator, result_type& result,
                      const Logger& /*logger*/) const {
       assert(result.trajectory && "No MultiTrajectory set");
 
       if (result.finished) {
         return Result<void>::success();
       }
 
       ACTS_VERBOSE("ReferenceTrajectory step at pos: "
                    << stepper.position(state.stepping).transpose()
                    << " dir: " << stepper.direction(state.stepping).transpose()
                    << " momentum: "
                    << stepper.absoluteMomentum(state.stepping));
 
       if (result.pathLimitReached.internalLimit ==
           std::numeric_limits<double>::max()) {
         detail::setupLoopProtection(state, stepper, result.pathLimitReached,
                                     true, logger());
       }
 
       if (const Surface* surface = navigator.currentSurface(state.navigation);
           surface != nullptr) {
         ACTS_VERBOSE("Handle Surface " << surface->geometryId() << " "
                                        << state.options.direction);
         auto res = handleSurface(*surface, state, stepper, navigator, result);
         if (!res.ok()) {
           ACTS_DEBUG("Error in " << state.options.direction
                                  << " filter: " << res.error());
           return res.error();
         }
       }
 
       const bool isEndOfWorldReached =
           endOfWorldReached.checkAbort(state, stepper, navigator, logger());
       const bool isVolumeConstraintReached = volumeConstraintAborter.checkAbort(
           state, stepper, navigator, logger());
       const bool isPathLimitReached = result.pathLimitReached.checkAbort(
           state, stepper, navigator, logger());
       const bool isTargetReached =
           targetReached.checkAbort(state, stepper, navigator, logger());
       if (isEndOfWorldReached || isVolumeConstraintReached ||
           isPathLimitReached || isTargetReached) {
         ACTS_VERBOSE(
             "Finalizing reference trajectory: "
             << (isEndOfWorldReached ? "end of world reached; " : "")
             << (isVolumeConstraintReached ? "volume constraint reached; " : "")
             << (isPathLimitReached ? "path limit reached; " : "")
             << (isTargetReached ? "target surface reached; " : ""));
 
         if (isTargetReached) {
           ACTS_VERBOSE("Setting parameters at target surface");
 
           auto res = stepper.boundState(state.stepping, *targetReached.surface);
           if (!res.ok()) {
             ACTS_DEBUG("Error while acquiring bound state for target surface: "
                        << res.error() << " " << res.error().message());
             return res.error();
           } else {
             const auto& [boundParams, jacobian, pathLength] = *res;
             result.referenceParameters = boundParams;
           }
         }
 
         result.finished = true;
       }
 
       return Result<void>::success();
     }
 
     template <typename propagator_state_t, typename stepper_t,
               typename navigator_t>
     bool checkAbort(propagator_state_t& /*state*/, const stepper_t& /*stepper*/,
                     const navigator_t& /*navigator*/, const result_type& result,
                     const Logger& /*logger*/) const {
       return result.finished;
     }
 
     template <typename propagator_state_t, typename stepper_t,
               typename navigator_t>
     Result<void> handleSurface(const Surface& surface,
                                propagator_state_t& state,
                                const stepper_t& stepper,
                                const navigator_t& navigator,
                                result_type& result) const {
       stepper.transportCovarianceToBound(state.stepping, surface,
                                          freeToBoundCorrection);
 
       const Result<detail::PointwiseMaterialEffects> materialInteractionPreRes =
           detail::performMaterialInteraction(
               state, stepper, surface,
               detail::determineMaterialUpdateMode(
                   state, navigator, MaterialUpdateMode::PreUpdate),
               NoiseUpdateMode::addNoise, multipleScattering, energyLoss,
               logger());
       if (!materialInteractionPreRes.ok()) {
         ACTS_DEBUG("Error during pre-update material interaction: "
                    << materialInteractionPreRes.error());
         return materialInteractionPreRes.error();
       }
 
       TrackStatePropMask mask =
           TrackStatePropMask::Predicted | TrackStatePropMask::Jacobian;
       TrackStateProxy trackStateProxy =
           result.trajectory->makeTrackState(mask, result.lastTrackStateIndex);
 
       ConstTrackStateProxy trackStateProxyConst{trackStateProxy};
 
       trackStateProxy.setReferenceSurface(surface.getSharedPtr());
       auto res = stepper.boundState(state.stepping, surface, false,
                                     freeToBoundCorrection);
       if (!res.ok()) {
         ACTS_DEBUG("Propagate to surface " << surface.geometryId()
                                            << " failed: " << res.error());
         return res.error();
       }
       const auto& [boundParams, jacobian, pathLength] = *res;
 
       trackStateProxy.predicted() = boundParams.parameters();
       trackStateProxy.predictedCovariance() = state.stepping.cov;
       trackStateProxy.jacobian() = jacobian;
       trackStateProxy.pathLength() = pathLength;
 
       auto typeFlags = trackStateProxy.typeFlags();
       typeFlags.setHasParameters();
       if (surface.hasMaterial()) {
         typeFlags.setHasMaterial();
       }
 
       result.lastTrackStateIndex = trackStateProxy.index();
 
       const Result<detail::PointwiseMaterialEffects>
           materialInteractionPostRes = detail::performMaterialInteraction(
               state, stepper, surface,
               detail::determineMaterialUpdateMode(
                   state, navigator, MaterialUpdateMode::PostUpdate),
               NoiseUpdateMode::addNoise, multipleScattering, energyLoss,
               logger());
       if (!materialInteractionPostRes.ok()) {
         ACTS_DEBUG("Error during post-update material interaction: "
                    << materialInteractionPostRes.error());
         return materialInteractionPostRes.error();
       }
 
       return Result<void>::success();
     }
   };
 
  public:
   /// Build the reference trajectory and return a track proxy to the built
   /// trajectory
   /// @tparam track_container_t The type of the track container frontend
   /// @param sParameters The starting track parameters for the reference trajectory building
   /// @param actorOptions The options for the reference trajectory builder actor
   /// @param trackContainer The track container to hold the built trajectory
   /// @return A Result containing the track proxy to the built trajectory or an error if the building failed
   template <TrackContainerFrontend track_container_t>
   Result<typename track_container_t::TrackProxy> build(
       const BoundTrackParameters& sParameters, const Options& actorOptions,
       track_container_t& trackContainer) const {
     auto propagatorOptions = makePropagatorOptions(
         actorOptions, nullptr, actorOptions.referenceSurface);
     return buildImpl(sParameters, propagatorOptions, trackContainer);
   }
 
   /// Build the reference trajectory with a given surface sequence and return a
   /// track proxy to the built trajectory. This is only available for
   /// DirectNavigator.
   /// @tparam track_container_t The type of the track container frontend
   /// @param sParameters The starting track parameters for the reference trajectory building
   /// @param actorOptions The options for the reference trajectory builder actor
   /// @param sSequence The surface sequence for the DirectNavigator
   /// @param trackContainer The track container to hold the built trajectory
   /// @return A Result containing the track proxy to the built trajectory or an error if the building failed
   template <TrackContainerFrontend track_container_t>
   Result<typename track_container_t::TrackProxy> build(
       const BoundTrackParameters& sParameters, const Options& actorOptions,
       const std::vector<const Surface*>& sSequence,
       track_container_t& trackContainer) const
     requires isDirectNavigator
   {
     auto propagatorOptions = makePropagatorOptions(
         actorOptions, &sSequence, actorOptions.referenceSurface);
     return buildImpl(sParameters, propagatorOptions, trackContainer);
   }
 
   /// Attach source links to the track states in the trajectory based on the
   /// reference surfaces and the provided source link range. Mark track states
   /// as holes if no matching source link is found for their reference surface.
   /// @tparam track_proxy_t The type of the track proxy
   /// @tparam source_link_range_t The type of the source link range, which should be a range of SourceLink objects
   /// @param trackProxy The track proxy to which the source links will be attached
   /// @param sourceLinkRange The range of source links to be attached to the track states
   /// @param surfaceAccessor A function or functor that takes a SourceLink and returns a pointer to the corresponding Surface object
   template <typename track_proxy_t, typename source_link_range_t>
   void attachSourceLinks(
       track_proxy_t trackProxy, const source_link_range_t& sourceLinkRange,
       const SourceLinkSurfaceAccessor& surfaceAccessor) const {
     const std::size_t nMeasurements = std::ranges::distance(sourceLinkRange);
 
     ACTS_VERBOSE("Preparing " << nMeasurements << " input measurements");
     std::unordered_map<const Surface*, SourceLink> inputMeasurements;
     for (const SourceLink& sourceLink : sourceLinkRange) {
       const Surface* surface = surfaceAccessor(sourceLink);
       inputMeasurements.try_emplace(surface, sourceLink);
     }
 
     for (auto trackState : trackProxy.trackStates()) {
       if (!trackState.hasReferenceSurface()) {
         continue;
       }
       const Surface& surface = trackState.referenceSurface();
 
       if (!surface.isSensitive()) {
         continue;
       }
 
       auto typeFlagsMap = trackState.typeFlags();
 
       if (const auto it = inputMeasurements.find(&surface);
           it == inputMeasurements.end()) {
         typeFlagsMap.setIsHole();
       } else {
         SourceLink sourceLink = it->second;
 
         trackState.setUncalibratedSourceLink(std::move(sourceLink));
         typeFlagsMap.setHasMeasurement();
       }
     }
   }
 
   /// Calibrator interface
   using Calibrator =
       Delegate<void(const GeometryContext&, const CalibrationContext&,
                     const SourceLink&, TrackStateProxy)>;
 
   /// Calibrate the measurements in the track states using the provided
   /// calibrator. The calibrator is called for each track state that has a
   /// measurement.
   /// @tparam track_proxy_t The type of the track proxy
   /// @param geoContext The geometry context to be passed to the calibrator
   /// @param calibrationContext The calibration context to be passed to the calibrator
   /// @param trackProxy The track proxy whose track states will be calibrated
   /// @param calibrator The calibrator to be called for each track state with a measurement
   template <typename track_proxy_t>
   void calibrateMeasurements(const GeometryContext& geoContext,
                              const CalibrationContext& calibrationContext,
                              track_proxy_t trackProxy,
                              const Calibrator& calibrator) const {
     for (auto trackState : trackProxy.trackStates()) {
       if (!trackState.typeFlags().hasMeasurement()) {
         continue;
       }
 
       trackState.addComponents(TrackStatePropMask::Calibrated);
 
       const SourceLink& sourceLink = trackState.getUncalibratedSourceLink();
       calibrator(geoContext, calibrationContext, sourceLink, trackState);
     }
   }
 
   /// Filter interface
   using Updater = Delegate<Result<void>(const GeometryContext&, TrackStateProxy,
                                         const Logger&)>;
 
   /// Update the track states in the trajectory using the provided updater. The
   /// updater is called for each track state that has a measurement.
   /// @tparam track_proxy_t The type of the track proxy
   /// @param geoContext The geometry context to be passed to the updater
   /// @param trackProxy The track proxy whose track states will be updated
   /// @param updater The updater to be called for each track state with a measurement
   /// @return A Result indicating success or failure of the update process
   template <typename track_proxy_t>
   Result<void> filter(const GeometryContext& geoContext,
                       track_proxy_t trackProxy, const Updater& updater) const {
     std::optional<TrackStateProxy> lastTrackState;
     BoundVector accumulatedBoundDeltas = BoundVector::Zero();
     BoundMatrix predictedCovariance = BoundMatrix::Zero();
 
     for (auto trackState : trackProxy.trackStates()) {
       if (lastTrackState.has_value()) {
         // Transport the last delta to the current surface using the Jacobian of
         // the track state
 
         accumulatedBoundDeltas = trackState.jacobian() * accumulatedBoundDeltas;
         trackState.predicted() += accumulatedBoundDeltas;
 
         predictedCovariance = trackState.jacobian() * predictedCovariance *
                               trackState.jacobian().transpose();
 
         {
           const FreeVector freeParams = transformBoundToFreeParameters(
               trackState.referenceSurface(), geoContext,
               trackState.predicted());
 
           const Result<MaterialSlab> materialSlabRes =
               detail::evaluateMaterialSlab(
                   geoContext, trackState.referenceSurface(),
                   Direction::Forward(), freeParams.segment<3>(eFreePos0),
                   freeParams.segment<3>(eFreeDir0),
                   MaterialUpdateMode::PreUpdate);
           if (!materialSlabRes.ok()) {
             ACTS_DEBUG(
                 "Error evaluating material slab: " << materialSlabRes.error());
             return materialSlabRes.error();
           }
           const MaterialSlab materialSlab = materialSlabRes.value();
 
           const detail::PointwiseMaterialEffects materialEffects =
               detail::computeMaterialEffects(
                   materialSlab, trackProxy.particleHypothesis(),
                   freeParams.segment<3>(eFreeDir0), freeParams[eFreeQOverP],
                   true, true, true);
 
           predictedCovariance(eBoundPhi, eBoundPhi) +=
               materialEffects.variancePhi;
           predictedCovariance(eBoundTheta, eBoundTheta) +=
               materialEffects.varianceTheta;
           predictedCovariance(eBoundQOverP, eBoundQOverP) +=
               materialEffects.varianceQoverP;
         }
 
         trackState.predictedCovariance() = predictedCovariance;
       }
 
       if (!trackState.typeFlags().hasMeasurement()) {
         trackState.shareFrom(trackState, TrackStatePropMask::Predicted,
                              TrackStatePropMask::Filtered);
       } else {
         trackState.addComponents(TrackStatePropMask::Filtered);
 
         const Result<void> updateResult =
             updater(geoContext, trackState, logger());
         if (!updateResult.ok()) {
           ACTS_DEBUG("Error in filter: " << updateResult.error());
           return updateResult.error();
         }
       }
 
       lastTrackState = trackState;
       accumulatedBoundDeltas += trackState.filtered() - trackState.predicted();
       predictedCovariance = trackState.filteredCovariance();
 
       {
         const FreeVector freeParams = transformBoundToFreeParameters(
             trackState.referenceSurface(), geoContext, trackState.filtered());
 
         const Result<MaterialSlab> materialSlabRes =
             detail::evaluateMaterialSlab(
                 geoContext, trackState.referenceSurface(), Direction::Forward(),
                 freeParams.segment<3>(eFreePos0),
                 freeParams.segment<3>(eFreeDir0),
                 MaterialUpdateMode::PostUpdate);
         if (!materialSlabRes.ok()) {
           ACTS_DEBUG(
               "Error evaluating material slab: " << materialSlabRes.error());
           return materialSlabRes.error();
         }
         const MaterialSlab materialSlab = materialSlabRes.value();
 
         const detail::PointwiseMaterialEffects materialEffects =
             detail::computeMaterialEffects(
                 materialSlab, trackProxy.particleHypothesis(),
                 freeParams.segment<3>(eFreeDir0), freeParams[eFreeQOverP], true,
                 true, true);
 
         predictedCovariance(eBoundPhi, eBoundPhi) +=
             materialEffects.variancePhi;
         predictedCovariance(eBoundTheta, eBoundTheta) +=
             materialEffects.varianceTheta;
         predictedCovariance(eBoundQOverP, eBoundQOverP) +=
             materialEffects.varianceQoverP;
       }
     }
 
     return Result<void>::success();
   }
 
  private:
   auto makePropagatorOptions(const Options& actorOptions,
                              const std::vector<const Surface*>* sSequence,
                              const Surface* targetSurface) const {
     using Actors = ActorList<Actor>;
     using PropagatorOptions = typename propagator_t::template Options<Actors>;
 
     PropagatorOptions propagatorOptions(actorOptions.geoContext,
                                         actorOptions.magFieldContext);
     propagatorOptions.setPlainOptions(actorOptions.propagatorPlainOptions);
 
     if constexpr (!isDirectNavigator) {
       if (sSequence != nullptr) {
         for (const Surface* surface : *sSequence) {
           propagatorOptions.navigation.appendExternalSurface(*surface);
         }
       }
     } else {
       assert(sSequence != nullptr &&
              "DirectNavigator requires a surface sequence for "
              "ReferenceTrajectory");
       propagatorOptions.navigation.externalSurfaces = *sSequence;
     }
 
     auto& actor = propagatorOptions.actorList.template get<Actor>();
     actor.targetReached.surface = targetSurface;
     actor.multipleScattering = actorOptions.multipleScattering;
     actor.energyLoss = actorOptions.energyLoss;
     actor.freeToBoundCorrection = actorOptions.freeToBoundCorrection;
     actor.actorLogger = m_actorLogger.get();
 
     return propagatorOptions;
   }
 
   template <typename propagator_options_t,
             TrackContainerFrontend track_container_t>
   auto buildImpl(const BoundTrackParameters& sParameters,
                  const propagator_options_t& propagatorOptions,
                  track_container_t& trackContainer) const
       -> Result<typename track_container_t::TrackProxy> {
     auto propagatorState = m_propagator.makeState(propagatorOptions);
 
     auto propagatorInitResult =
         m_propagator.initialize(propagatorState, sParameters);
     if (!propagatorInitResult.ok()) {
       ACTS_DEBUG("Propagation initialization failed: "
                  << propagatorInitResult.error());
       return propagatorInitResult.error();
     }
 
     auto& actorResult = propagatorState.template get<ResultType>();
     actorResult.trajectory = &trackContainer.trackStateContainer();
 
     auto result = m_propagator.propagate(propagatorState);
 
     if (!result.ok()) {
       ACTS_DEBUG("Propagation failed: " << result.error());
       return result.error();
     }
 
     auto track = trackContainer.makeTrack();
     track.tipIndex() = actorResult.lastTrackStateIndex;
     if (actorResult.referenceParameters.has_value()) {
       const auto& params = *actorResult.referenceParameters;
       track.parameters() = params.parameters();
       track.covariance() = params.covariance().value();
       track.setReferenceSurface(params.referenceSurface().getSharedPtr());
     }
 
     track.linkForward();
 
     return track;
   }
 };
 
 }  // namespace Acts::Experimental

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