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 //------------------------------- -*- C++ -*- -------------------------------//
 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 //---------------------------------------------------------------------------//
 //! \file orange/orangeinp/IntersectSurfaceBuilder.hh
 //---------------------------------------------------------------------------//
 #pragma once
 
 #include <vector>
 
 #include "geocel/BoundingBox.hh"
 #include "orange/OrangeTypes.hh"
 #include "orange/surf/VariantSurface.hh"
 
 #include "CsgTypes.hh"
 
 namespace celeritas
 {
 namespace orangeinp
 {
 namespace detail
 {
 class CsgUnitBuilder;
 struct IntersectSurfaceState;
 }  // namespace detail
 
 //---------------------------------------------------------------------------//
 /*!
  * Build a region of intersecting surfaces as a CSG node.
  *
  * This is the building block for constructing shapes, solids, and so forth.
  * The result of this class is:
  * - CSG nodes describing the inserted surfaces which have been transformed
  *   into the global reference frame
  * - Metadata combining the surfaces names with the object name
  * - Bounding boxes (interior and exterior)
  *
  * Internally, this class uses:
  * - \c SurfaceClipper to update bounding boxes for closed quadric surfaces
  *   (axis aligned cylinders, spheres, planes)
  * - \c apply_transform (which calls \c detail::SurfaceTransformer and its
  *   siblings) to generate new surfaces based on the local transformed
  *   coordinate system
  * - \c RecursiveSimplifier to take transformed or user-input surfaces and
  *   reduce them to more compact quadric representations
  */
 class IntersectSurfaceBuilder
 {
   public:
     //!@{
     //! \name Type aliases
     using Tol = Tolerance<>;
     //!@}
 
   public:
     // Get the construction tolerance
     Tol const& tol() const;
 
     // Add a surface with negative quadric value being "inside"
     template<class S>
     inline void operator()(S const& surf);
 
     // Add a surface with specified sense (usually inside except for planes)
     template<class S>
     void operator()(Sense sense, S const& surf);
 
     // Add a surface with specified sense and explicit face name
     template<class S>
     void operator()(Sense sense, S const& surf, std::string&& face_name);
 
     // Promise that the resulting region is inside/outside this bbox
     inline void operator()(Sense sense, BBox const& bbox);
 
   public:
     // "Private", to be used by testing and detail
     using State = detail::IntersectSurfaceState;
     using UnitBuilder = detail::CsgUnitBuilder;
     using VecNode = std::vector<NodeId>;
 
     // Construct with persistent unit builder and less persistent state
     IntersectSurfaceBuilder(UnitBuilder* ub, State* state);
 
   private:
     //// TYPES ////
 
     // Helper for constructing surfaces
     UnitBuilder* ub_;
 
     // State being modified by this builder
     State* state_;
 
     //// HELPER FUNCTION ////
 
     void insert_transformed(Sense sense,
                             VariantSurface const& surf,
                             std::string&& ext);
     void shrink_exterior(BBox const& bbox);
     void grow_interior(BBox const& bbox);
 };
 
 //---------------------------------------------------------------------------//
 // FREE FUNCTIONS
 //---------------------------------------------------------------------------//
 
 // Apply a surface builder to an unknown type
 void visit(IntersectSurfaceBuilder& csb,
            Sense sense,
            VariantSurface const& surf);
 
 //---------------------------------------------------------------------------//
 // INLINE FUNCTION DEFINITIONS
 //---------------------------------------------------------------------------//
 /*!
  * Add a surface with negative quadric value being "inside".
  */
 template<class S>
 void IntersectSurfaceBuilder::operator()(S const& surf)
 {
     return (*this)(Sense::inside, surf);
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Promise that all bounding surfaces are inside/outside this bbox.
  *
  * "inside" will shrink the exterior bbox, and "outside" will grow the interior
  * bbox. All bounding surfaces within the region must be *inside* the exterior
  * region and *outside* the interior region.
  */
 void IntersectSurfaceBuilder::operator()(Sense sense, BBox const& bbox)
 {
     if (sense == Sense::inside)
     {
         this->shrink_exterior(bbox);
     }
     else
     {
         this->grow_interior(bbox);
     }
 }
 
 //---------------------------------------------------------------------------//
 }  // namespace orangeinp
 }  // namespace celeritas

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