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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/Algebra.hpp"
 #include "Acts/Material/ISurfaceMaterial.hpp"
 #include "Acts/Material/MaterialSlab.hpp"
 #include "Acts/Utilities/AnyGridView.hpp"
 #include "Acts/Utilities/Delegate.hpp"
 #include "Acts/Utilities/Grid.hpp"
 #include "Acts/Utilities/GridAccessHelpers.hpp"
 #include "Acts/Utilities/ProtoAxis.hpp"
 
 #include <ostream>
 #include <stdexcept>
 #include <vector>
 
 namespace Acts {
 
 /// @brief Base class for material accessors, this is needed
 /// for the I/O of the different grid material types, in the actual
 /// implementation the material accessor is a template parameter.
 struct IGridMaterialAccessor {
   virtual ~IGridMaterialAccessor() = default;
 };
 
 /// @brief  This is an accessor for cases where the material is directly stored
 /// in the grid, it simply forwards the grid entry in const and non-const way.
 struct GridMaterialAccessor : public IGridMaterialAccessor {
   /// @brief  Broadcast the type of the material slab
   using grid_value_type = MaterialSlab;
   /// @brief  Direct const access to the material slap sorted in the grid
   /// @tparam grid_type the type of the grid, also defines the point type
   /// @param grid the grid
   /// @param point the lookup point (already casted from global, or filled from local)
   ///
   /// @return the material slab from the grid bin associated to the lookup point
   template <typename grid_type>
   inline const MaterialSlab& slab(
       grid_type& grid, const typename grid_type::point_t& point) const {
     return grid.atPosition(point);
   }
 
   /// @brief Scale the material (by scaling the thickness)
   ///
   /// @param grid the grid (ignored)
   /// @param scale the amount of the scaling
   ///
   /// @note this is not particularly fast
   template <typename grid_type>
   void scale(grid_type& grid, double scale) {
     // Loop through the grid bins, get the indices and scale the material
     for (std::size_t ib = 0; ib < grid.size(); ++ib) {
       grid.at(ib).scaleThickness(static_cast<float>(scale));
     }
   }
 };
 
 /// @brief  This is an accessor for cases where the material is filled in a vector
 /// and then indexed by the grid
 struct IndexedMaterialAccessor : public IGridMaterialAccessor {
   /// Broadcast the grid_value_type
   using grid_value_type = std::size_t;
 
   /// @brief The internal storage of the material
   /// @param mmaterial Vector of material slabs to store and access by index
   explicit IndexedMaterialAccessor(std::vector<MaterialSlab>&& mmaterial)
       : IGridMaterialAccessor(), material(std::move(mmaterial)) {}
 
   /// @brief The internal storage of the material
   std::vector<MaterialSlab> material;
   /// @brief  Direct const access to the material slap sorted in the grid
   /// @tparam grid_type the type of the grid, also defines the point type
   /// @param grid the grid
   /// @param point the lookup point (already casted from global, or filled from local)
   ///
   /// @return the material slab from the grid bin associated to the lookup point
   template <typename grid_type>
   inline const MaterialSlab& slab(
       const grid_type& grid, const typename grid_type::point_t& point) const {
     auto index = grid.atPosition(point);
     return material[index];
   }
 
   /// @brief Scale the material (by scaling the thickness)
   ///
   /// @param scale the amount of the scaling
   template <typename grid_type>
   void scale(grid_type& /*grid*/, double scale) {
     for (auto& m : material) {
       m.scaleThickness(static_cast<float>(scale));
     }
   }
 };
 
 /// @brief  This is an accessor for cases where the material is filled in a global
 /// material vector that is accessed from the different material grids.
 struct GloballyIndexedMaterialAccessor : public IGridMaterialAccessor {
   /// Constructor with global material vector
   /// @param gMaterial Shared pointer to global material vector
   /// @param shared Whether material entries are shared across grid points
   explicit GloballyIndexedMaterialAccessor(
       std::shared_ptr<std::vector<MaterialSlab>> gMaterial, bool shared = false)
       : IGridMaterialAccessor(),
         globalMaterial(std::move(gMaterial)),
         sharedEntries(shared) {}
 
   /// Broadcast the grid_value_type
   using grid_value_type = std::size_t;
 
   /// @brief The internal storage of the material
   std::shared_ptr<std::vector<MaterialSlab>> globalMaterial = nullptr;
 
   /// Indicate if you have entries bins across different grids, e.g. by
   /// running a compression/clustering algorithm.
   ///
   /// It is the responsibility of the user to set this flag correctly.
   bool sharedEntries = false;
 
   /// @brief  Direct const access to the material slap sorted in the grid
   ///
   /// @tparam grid_type the type of the grid, also defines the point type
   ///
   /// @param grid the grid holding the indices into the global material vector
   /// @param point the lookup point (already casted from global, or filled from local)
   ///
   /// @return the material slab from the grid bin associated to the lookup point
   template <typename grid_type>
   inline const MaterialSlab& slab(
       const grid_type& grid, const typename grid_type::point_t& point) const {
     auto index = grid.atPosition(point);
     return (*globalMaterial)[index];
   }
 
   /// @brief Scale the material (by scaling the thickness)
   ///
   /// @param grid the grid holding the indices into the global material vector
   /// @param scale the amount of the scaling
   ///
   /// @note this will scale only the bins touched by this grid, however,
   /// if there are shared bins, then it will throw an exception as the
   /// outcome is unpredictable.
   ///
   template <typename grid_type>
   void scale(grid_type& grid, double scale) {
     if (sharedEntries) {
       throw std::invalid_argument(
           "GloballyIndexedMaterialAccessor: shared entry scaling is not "
           "supported.");
     }
     // Loop through the grid bins, get the indices and scale the material
     for (std::size_t ib = 0; ib < grid.size(); ++ib) {
       auto index = grid.at(ib);
       (*globalMaterial)[index].scaleThickness(static_cast<float>(scale));
     }
   }
 };
 
 /// Base class for the concrete templated grid surface material types.
 /// This allows referning to all template instances as the same base class type.
 class IGridSurfaceMaterialBase : public ISurfaceMaterial {};
 
 /// Intermediate interface to the grid surface material given access to the grid
 /// and the material accessor.
 template <typename grid_value_t>
 class IGridSurfaceMaterial : public IGridSurfaceMaterialBase {
  public:
   /// @brief Accessor to the grid interface
   /// @return Reference to the grid interface
   virtual const IGrid& grid() const = 0;
 
   /// @brief Accessor to the material accessor
   /// @return Reference to the material accessor
   virtual const IGridMaterialAccessor& materialAccessor() const = 0;
 
   /// @brief Accessor to the bound to grid local delegate
   /// @return Reference to the bound to grid local coordinate transformation delegate
   virtual const GridAccess::IBoundToGridLocal& boundToGridLocal() const = 0;
 
   /// @brief Accessor to the global to grid local delegate
   /// @return Reference to the global to grid local coordinate transformation delegate
   virtual const GridAccess::IGlobalToGridLocal& globalToGridLocal() const = 0;
 
   /// Return the type erased grid view
   /// @return Type-erased grid view for accessing grid contents
   virtual AnyGridView<grid_value_t> gridView() = 0;
 
   /// Return the type erased (const) grid view
   /// @return Type-erased const grid view for read-only access to grid contents
   virtual AnyGridConstView<grid_value_t> gridConstView() const = 0;
 };
 
 /// @brief GridSurfaceMaterialT
 ///
 /// It extends the @c ISurfaceMaterial base class and allows to create
 /// material maps associated to a grid structure
 ///
 /// @tparam grid_type is the type of the grid used here
 /// @tparam material_accessor_type is the type of the accessor to the material
 ///
 /// It is templated on the material type and a slab accessor type in order
 /// to allow it to be used in the material recording as well.
 template <typename grid_t, typename material_accessor_t>
 class GridSurfaceMaterialT
     : public IGridSurfaceMaterial<
           typename material_accessor_t::grid_value_type> {
  public:
   /// Type alias for bound coordinates to grid local coordinates conversion
   /// delegate
   using BoundToGridLocalDelegate =
       OwningDelegate<typename grid_t::point_t(const Vector2&),
                      GridAccess::IBoundToGridLocal>;
 
   /// Type alias for global coordinates to grid local coordinates conversion
   /// delegate
   using GlobalToGridLocalDelegate =
       OwningDelegate<typename grid_t::point_t(const Vector3&),
                      GridAccess::IGlobalToGridLocal>;
 
   /// Broadcast grid type
   using grid_type = grid_t;
 
   /// Broadcast material accessor type
   using material_accessor_type = material_accessor_t;
 
   /// @brief Constructor for indexed surface material
   ///
   /// @param grid the index grid steering the access to the material vector
   /// @param materialAccessor the material accessor: from grid, from indexed vector
   /// @param boundToGridLocal the delegation from bound to grid local frame
   /// @param globalToGridLocal the delegation from global into grid local frame
   GridSurfaceMaterialT(grid_type&& grid,
                        material_accessor_type&& materialAccessor,
                        BoundToGridLocalDelegate boundToGridLocal,
                        GlobalToGridLocalDelegate globalToGridLocal)
       : m_grid(std::move(grid)),
         m_materialAccessor(std::move(materialAccessor)),
         m_globalToGridLocal(std::move(globalToGridLocal)),
         m_boundToGridLocal(std::move(boundToGridLocal)) {
     if (!m_globalToGridLocal.connected()) {
       throw std::invalid_argument(
           "GridSurfaceMaterialT: GlobalToGridLocalDelegate is not connected.");
     }
     if (!m_boundToGridLocal.connected()) {
       throw std::invalid_argument(
           "GridSurfaceMaterialT: BoundToGridLocalDelegate is not connected.");
     }
   }
 
   /// @copydoc ISurfaceMaterial::materialSlab(const Vector2&) const
   const MaterialSlab& materialSlab(const Vector2& lp) const final {
     return m_materialAccessor.slab(m_grid, m_boundToGridLocal(lp));
   }
 
   /// @copydoc ISurfaceMaterial::materialSlab(const Vector3&) const
   const MaterialSlab& materialSlab(const Vector3& gp) const final {
     return m_materialAccessor.slab(m_grid, m_globalToGridLocal(gp));
   }
 
   /// Scale operator
   ///
   /// @param factor is the scale factor applied
   /// @return Reference to this surface material for method chaining
   ISurfaceMaterial& scale(double factor) final {
     m_materialAccessor.scale(m_grid, factor);
     return (*this);
   }
 
   /// Output Method for std::ostream, to be overloaded by child classes
   /// @param sl Output stream to write to
   /// @return Reference to the output stream
   std::ostream& toStream(std::ostream& sl) const final {
     sl << "GridSurfaceMaterial - material access via accessor.";
     return sl;
   }
 
   /// @brief Accessor to the grid
   /// @return Reference to the underlying grid
   const grid_type& grid() const final { return m_grid; }
 
   // Return a type-erased indexed grid view
   /// @return Type-erased grid view for accessing grid contents
   AnyGridView<typename material_accessor_t::grid_value_type> gridView() final {
     return AnyGridView<typename material_accessor_t::grid_value_type>(m_grid);
   }
 
   // Return a type-erased indexed const grid view
   /// @return Type-erased const grid view for read-only access to grid contents
   AnyGridConstView<typename material_accessor_t::grid_value_type>
   gridConstView() const final {
     return AnyGridConstView<typename material_accessor_t::grid_value_type>(
         m_grid);
   }
 
   /// @brief Accessor to the material accessor
   /// @return Reference to the material accessor
   const material_accessor_type& materialAccessor() const final {
     return m_materialAccessor;
   }
 
   /// @brief Accessor to the bound to grid local delegate
   /// @return Reference to the bound to grid local coordinate transformation delegate
   const GridAccess::IBoundToGridLocal& boundToGridLocal() const final {
     return *(m_boundToGridLocal.instance());
   }
 
   /// @brief Accessor to the bound to grid local delegate
   /// @return Reference to the bound to grid local delegate
   const BoundToGridLocalDelegate& boundToGridLocalDelegate() const {
     return m_boundToGridLocal;
   }
 
   /// @brief Accessor to the global to grid local delegate
   /// @return Reference to the global to grid local coordinate transformation delegate
   const GridAccess::IGlobalToGridLocal& globalToGridLocal() const final {
     return *(m_globalToGridLocal.instance());
   }
 
   /// @brief Accessor to the global to grid local delegate
   /// @return Reference to the global to grid local delegate
   const GlobalToGridLocalDelegate& globalToGridLocalDelegate() const {
     return m_globalToGridLocal;
   }
 
  private:
   /// @brief The grid
   grid_type m_grid;
 
   /// @brief The stored material accessor
   material_accessor_type m_materialAccessor;
 
   /// The global to grid local delegate
   GlobalToGridLocalDelegate m_globalToGridLocal;
 
   /// The bound to grid local delegate
   BoundToGridLocalDelegate m_boundToGridLocal;
 };
 
 /// @brief Type alias for surface material indexed by local coordinates
 /// @details Surface material implementation that uses local coordinate indexing
 /// @tparam grid_type The type of grid used for material mapping
 template <typename grid_type>
 using IndexedSurfaceMaterial =
     GridSurfaceMaterialT<grid_type, IndexedMaterialAccessor>;
 
 /// @brief Type alias for surface material indexed by global coordinates
 /// @details Surface material implementation that uses global coordinate indexing
 template <typename grid_type>
 using GloballyIndexedSurfaceMaterial =
     GridSurfaceMaterialT<grid_type, GloballyIndexedMaterialAccessor>;
 
 /// @brief Type alias for grid-based surface material
 /// @details Surface material implementation using a regular grid structure
 template <typename grid_type>
 using GridSurfaceMaterial =
     GridSurfaceMaterialT<grid_type, GridMaterialAccessor>;
 
 }  // namespace Acts

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