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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/phys/ParticleData.hh
 //---------------------------------------------------------------------------//
 #pragma once
 
 #include "corecel/Macros.hh"
 #include "corecel/data/Collection.hh"
 #include "corecel/data/CollectionBuilder.hh"
 #include "corecel/sys/ThreadId.hh"
 #include "celeritas/Quantities.hh"
 #include "celeritas/Types.hh"
 
 namespace celeritas
 {
 //---------------------------------------------------------------------------//
 // PARAMS
 //---------------------------------------------------------------------------//
 
 enum class MatterType : char
 {
     particle,
     antiparticle
 };
 
 //---------------------------------------------------------------------------//
 /*!
  * Access particle definitions on the device.
  *
  * Fundamental (static) properties of a particle type. Physical state of a
  * particle (kinetic energy, ...) is part of a ParticleState. This view is
  * created from \c ParticleParams. The size of the \c defs data member is the
  * number of particle types (accessed by \c ParticleId).
  *
  * \sa ParticleParams (owns the pointed-to data)
  * \sa ParticleTrackView (uses the pointed-to data in a kernel)
  */
 template<Ownership W, MemSpace M>
 struct ParticleParamsData
 {
     //// TYPES ////
 
     template<class T>
     using Items = Collection<T, W, M, ParticleId>;
 
     //// DATA ////
 
     Items<units::MevMass> mass;  //!< Rest mass [MeV / c^2]
     Items<units::ElementaryCharge> charge;  //!< Charge in units of [e]
     Items<real_type> decay_constant;  //!< Decay constant [1/s]
     Items<MatterType> matter;  //!< Antiparticle flag (negative PDG number)
 
     //// METHODS ////
 
     //! Whether the data is assigned
     explicit CELER_FUNCTION operator bool() const
     {
         return !mass.empty() && !charge.empty() && !decay_constant.empty()
                && !matter.empty();
     }
 
     //! Number of particles
     CELER_FUNCTION ParticleId::size_type size() const
     {
         return decay_constant.size();
     }
 
     //! Assign from another set of data
     template<Ownership W2, MemSpace M2>
     ParticleParamsData& operator=(ParticleParamsData<W2, M2> const& other)
     {
         CELER_EXPECT(other);
         mass = other.mass;
         charge = other.charge;
         decay_constant = other.decay_constant;
         matter = other.matter;
         return *this;
     }
 };
 
 //---------------------------------------------------------------------------//
 // STATE
 //---------------------------------------------------------------------------//
 /*!
  * Physical (dynamic) state of a particle track.
  *
  * The "physical state" is just about what differentiates this particle from
  * another (type, energy, polarization, ...) in the lab's inertial reference
  * frame. It does not include information about the particle's direction or
  * position, nor about path lengths or collisions.
  *
  * The energy is with respect to the lab frame. The particle state is
  * immutable: collisions and other interactions should return changes to the
  * particle state.
  */
 
 struct ParticleTrackInitializer
 {
     ParticleId particle_id;  //!< Type of particle (electron, gamma, ...)
     units::MevEnergy energy;  //!< Kinetic energy [MeV]
 
     //! True if assigned and valid
     explicit CELER_FUNCTION operator bool() const
     {
         return particle_id && energy > zero_quantity();
     }
 };
 
 //---------------------------------------------------------------------------//
 /*!
  * Data storage/access for particle properties.
  *
  * \sa ParticleTrackView (uses the pointed-to data in a kernel)
  */
 template<Ownership W, MemSpace M>
 struct ParticleStateData
 {
     //// TYPES ////
 
     template<class T>
     using Items = celeritas::StateCollection<T, W, M>;
 
     //// DATA ////
 
     Items<ParticleId> particle_id;  //!< Type of particle (electron, gamma,
                                     //!< ...)
     Items<real_type> particle_energy;  //!< Kinetic energy [MeV]
 
     //// METHODS ////
 
     //! Whether the interface is assigned
     explicit CELER_FUNCTION operator bool() const
     {
         return !particle_id.empty() && !particle_energy.empty();
     }
 
     //! State size
     CELER_FUNCTION TrackSlotId::size_type size() const
     {
         return particle_id.size();
     }
 
     //! Assign from another set of data
     template<Ownership W2, MemSpace M2>
     ParticleStateData& operator=(ParticleStateData<W2, M2>& other)
     {
         CELER_EXPECT(other);
         particle_id = other.particle_id;
         particle_energy = other.particle_energy;
         return *this;
     }
 };
 
 //---------------------------------------------------------------------------//
 /*!
  * Resize particle states in host code.
  */
 template<MemSpace M>
 inline void resize(ParticleStateData<Ownership::value, M>* data,
                    HostCRef<ParticleParamsData> const&,
                    size_type size)
 {
     CELER_EXPECT(size > 0);
     resize(&data->particle_id, size);
     resize(&data->particle_energy, size);
 }
 
 //---------------------------------------------------------------------------//
 }  // namespace celeritas

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