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 //------------------------------- -*- C++ -*- -------------------------------//
 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 //---------------------------------------------------------------------------//
 //! \file celeritas/user/RootStepWriter.hh
 //---------------------------------------------------------------------------//
 #pragma once
 
 #include <array>
 
 #include "corecel/Config.hh"
 
 #include "corecel/Assert.hh"
 #include "celeritas/ext/RootUniquePtr.hh"
 
 #include "RootStepWriterInput.hh"
 #include "StepInterface.hh"
 
 class TTree;
 
 namespace celeritas
 {
 //---------------------------------------------------------------------------//
 class ParticleParams;
 class RootFileManager;
 
 //---------------------------------------------------------------------------//
 /*!
  * Write "MC truth" data to ROOT at every step.
  *
  * `TTree::Fill()` is called for each step and thread id, making each ROOT
  * entry a step. Since the ROOT data is stored in branches with primitive types
  * instead of a full struct, no dictionaries are needed for reading the output
  * file.
  *
  * The step data that is written to the ROOT file can be filtered by providing
  * a user-defined `WriteFilter` function.
  */
 class RootStepWriter final : public StepInterface
 {
   public:
     // Unspecified step attribute data value
     static constexpr size_type unspecified{static_cast<size_type>(-1)};
 
     //! Truth step point data; Naming convention must match StepPointStateData
     struct TStepPoint
     {
         size_type volume_id = unspecified;
         real_type energy = 0;  //!< [MeV]
         real_type time = 0;  //!< [time]
         std::array<real_type, 3> pos{0, 0, 0};  //!< [len]
         std::array<real_type, 3> dir{0, 0, 0};
     };
 
     //! Truth step data; Naming convention must match StepStateData
     struct TStepData
     {
         size_type event_id = unspecified;
         size_type track_id = unspecified;
         size_type parent_id = unspecified;
         size_type primary_id = unspecified;
         size_type post_step_action_id = unspecified;
         size_type track_step_count = unspecified;
         real_type step_length = 0;  //!< [len]
         real_type energy_deposition = 0;  //!< [MeV]
         int particle = 0;  //!< PDG number
         EnumArray<StepPoint, TStepPoint> points;
     };
 
   public:
     //!@{
     //! \name Type aliases
     using SPRootFileManager = std::shared_ptr<RootFileManager>;
     using SPParticleParams = std::shared_ptr<ParticleParams const>;
     using WriteFilter = std::function<bool(TStepData const&)>;
     //!@}
 
     // Construct with step data writer filter
     RootStepWriter(SPRootFileManager root_manager,
                    SPParticleParams particle_params,
                    StepSelection selection,
                    WriteFilter filter);
 
     // Construct and store all step data
     RootStepWriter(SPRootFileManager root_manager,
                    SPParticleParams particle_params,
                    StepSelection selection);
 
     // Set number of entries stored in memory before being flushed to disk
     void set_auto_flush(long num_entries);
 
     // Process step data on the host and fill step tree
     void process_steps(HostStepState) final;
 
     // Device execution is not currently implemented
     void process_steps(DeviceStepState) final
     {
         CELER_NOT_IMPLEMENTED("RootStepWriter with device data");
     }
 
     // Selection of data to be stored
     StepSelection selection() const final { return selection_; }
 
     // No detector filtering selection is implemented
     Filters filters() const final { return {}; }
 
   private:
     // Create steps tree based on selection_ booleans
     void make_tree();
 
   private:
     SPRootFileManager root_manager_;
     SPParticleParams particles_;
     StepSelection selection_;
     UPRootTreeWritable tstep_tree_;
     TStepData tstep_;  // Members are used as refs of the TTree branches
     std::function<bool(TStepData const&)> filter_;
 };
 
 //---------------------------------------------------------------------------//
 // FREE FUNCTIONS
 //---------------------------------------------------------------------------//
 // Create a write filter for some simple IDs
 RootStepWriter::WriteFilter make_write_filter(SimpleRootFilterInput const&);
 
 //---------------------------------------------------------------------------//
 #if !CELERITAS_USE_ROOT
 inline RootStepWriter::RootStepWriter(
     SPRootFileManager, SPParticleParams, StepSelection, WriteFilter)
 {
     CELER_NOT_CONFIGURED("ROOT");
 }
 
 inline void RootStepWriter::process_steps(HostStepState)
 {
     CELER_NOT_CONFIGURED("ROOT");
 }
 
 inline RootStepWriter::WriteFilter make_write_filter(
     SimpleRootFilterInput const&)
 {
     return nullptr;
 }
 
 #endif
 
 //---------------------------------------------------------------------------//
 }  // namespace celeritas

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