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 //----------------------------------*-C++-*----------------------------------//
 // Copyright 2024 UT-Battelle, LLC, and other Celeritas developers.
 // See the top-level COPYRIGHT file for details.
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 //---------------------------------------------------------------------------//
 //! \file orange/orangeinp/Solid.hh
 //---------------------------------------------------------------------------//
 #pragma once
 
 #include <optional>
 #include <type_traits>
 #include <utility>
 
 #include "corecel/math/Turn.hh"
 
 #include "IntersectRegion.hh"
 #include "ObjectInterface.hh"
 
 namespace celeritas
 {
 namespace orangeinp
 {
 //---------------------------------------------------------------------------//
 /*!
  * Define the angular region of a solid.
  *
  * This is a pie slice infinite along the z axis and outward from it. Its cross
  * section is in the \em x-y plane, and a start
  * angle of zero corresponding to the \em +x axis. An interior angle of one
  * results in no radial excluded in the resulting solid. A interior angle of
  * more than 0.5 turns (180 degrees) results in a wedge being subtracted from
  * the solid, and an angle of less than or equal to 0.5 turns results in the
  * intersection of the solid with a wedge.
  *
  * \code
   // Truncates a solid to the east-facing quadrant:
   SolidEnclosedAngle{Turn{-0.125}, Turn{0.25}};
   // Removes the second quadrant (northwest) from a solid:
   SolidEnclosedAngle{Turn{0.50}, Turn{0.75}};
   \endcode
  */
 class SolidEnclosedAngle
 {
   public:
     //!@{
     //! \name Type aliases
     using SenseWedge = std::pair<Sense, InfWedge>;
     //!@}
 
   public:
     //! Default to "all angles"
     SolidEnclosedAngle() = default;
 
     // Construct from a starting angle and interior angle
     SolidEnclosedAngle(Turn start, Turn interior);
 
     // Construct a wedge shape to intersect (inside) or subtract (outside)
     SenseWedge make_wedge() const;
 
     // Whether the enclosed angle is not a full circle
     explicit inline operator bool() const;
 
     //! Starting angle
     Turn start() const { return start_; }
 
     //! Interior angle
     Turn interior() const { return interior_; }
 
   private:
     Turn start_{0};
     Turn interior_{1};
 };
 
 //---------------------------------------------------------------------------//
 /*!
  * A hollow shape with an optional start and end angle.
  *
  * Solids are a shape with (optionally) the same *kind* of shape subtracted
  * from it, and (optionally) an azimuthal section removed from it.
  */
 class SolidBase : public ObjectInterface
 {
   public:
     // Construct a volume from this object
     NodeId build(VolumeBuilder&) const final;
 
     // Write the shape to JSON
     void output(JsonPimpl*) const final;
 
     //! Interior intersect region interface for construction and access
     virtual IntersectRegionInterface const& interior() const = 0;
 
     //! Optional excluded region
     virtual IntersectRegionInterface const* excluded() const = 0;
 
     //! Optional azimuthal angular restriction
     virtual SolidEnclosedAngle enclosed_angle() const = 0;
 
   protected:
     //!@{
     //! Allow construction and assignment only through daughter classes
     SolidBase() = default;
     virtual ~SolidBase() = default;
     CELER_DEFAULT_COPY_MOVE(SolidBase);
     //!@}
 };
 
 //---------------------------------------------------------------------------//
 /*!
  * A shape that is hollow, is truncated azimuthally, or both.
  *
  * Examples: \code
    // A cone with a thickness of 0.1
    Solid s{"cone", Cone{{1, 2}, 10.0}, Cone{{0.9, 1.9}, 10.0}};
    // A cylinder segment in z={-2.5, 2.5}, r={0.5, 0.75}, theta={-45, 45} deg
    Solid s{"cyl", Cylinder{0.75, 5.0}, Cylinder{0.5, 5.0},
            {Turn{0}, Turn{0.25}};
    // The east-facing quarter of a cone shape
    Solid s{"cone", Cone{{1, 2}, 10.0}, {Turn{-0.125}, Turn{0.25}};
  * \endcode
  */
 template<class T>
 class Solid final : public SolidBase
 {
     static_assert(std::is_base_of_v<IntersectRegionInterface, T>);
 
   public:
     //!@{
     //! \name Type aliases
     using OptionalRegion = std::optional<T>;
     //!@}
 
   public:
     // Return a solid *or* shape given an optional interior or enclosed angle
     static SPConstObject or_shape(std::string&& label,
                                   T&& interior,
                                   OptionalRegion&& excluded,
                                   SolidEnclosedAngle&& enclosed);
 
     // Construct with an excluded interior *and/or* enclosed angle
     Solid(std::string&& label,
           T&& interior,
           OptionalRegion&& excluded,
           SolidEnclosedAngle&& enclosed);
 
     // Construct with only an enclosed angle
     Solid(std::string&& label, T&& interior, SolidEnclosedAngle&& enclosed);
 
     // Construct with only an excluded interior
     Solid(std::string&& label, T&& interior, T&& excluded);
 
     //! Get the user-provided label
     std::string_view label() const final { return label_; }
 
     //! Interior intersect region interface for construction and access
     IntersectRegionInterface const& interior() const final
     {
         return interior_;
     }
 
     // Optional excluded
     IntersectRegionInterface const* excluded() const final;
 
     //! Optional angular restriction
     SolidEnclosedAngle enclosed_angle() const final { return enclosed_; }
 
   private:
     std::string label_;
     T interior_;
     OptionalRegion exclusion_;
     SolidEnclosedAngle enclosed_;
 };
 
 //---------------------------------------------------------------------------//
 // DEDUCTION GUIDES
 //---------------------------------------------------------------------------//
 
 template<class T, class... Us>
 Solid(std::string&&, T&&, Us...) -> Solid<T>;
 
 //---------------------------------------------------------------------------//
 // TYPE ALIASES
 //---------------------------------------------------------------------------//
 
 using ConeSolid = Solid<Cone>;
 using CylinderSolid = Solid<Cylinder>;
 using PrismSolid = Solid<Prism>;
 using SphereSolid = Solid<Sphere>;
 
 //---------------------------------------------------------------------------//
 // EXPLICIT INSTANTIATION
 //---------------------------------------------------------------------------//
 
 extern template class Solid<Cone>;
 extern template class Solid<Cylinder>;
 extern template class Solid<Prism>;
 extern template class Solid<Sphere>;
 
 //---------------------------------------------------------------------------//
 // INLINE DEFINITIONS
 //---------------------------------------------------------------------------//
 /*!
  * Whether the enclosed angle is not a full circle.
  */
 SolidEnclosedAngle::operator bool() const
 {
     return interior_ != Turn{1};
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Access the optional excluded.
  */
 template<class T>
 IntersectRegionInterface const* Solid<T>::excluded() const
 {
     return exclusion_ ? &(*exclusion_) : nullptr;
 }
 
 //---------------------------------------------------------------------------//
 }  // namespace orangeinp
 }  // namespace celeritas

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