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 //------------------------------- -*- C++ -*- -------------------------------//
 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 //---------------------------------------------------------------------------//
 //! \file corecel/data/CollectionBuilder.hh
 //---------------------------------------------------------------------------//
 #pragma once
 
 #include <initializer_list>
 #include <limits>
 
 #include "corecel/Config.hh"
 
 #include "Collection.hh"
 
 #include "detail/FillInvalid.hh"
 
 namespace celeritas
 {
 //---------------------------------------------------------------------------//
 /*!
  * Helper class for constructing Collection objects.
  *
  * This is intended for use with host data but can also be used to resize
  * device collections. It's constructed with a reference to the host
  * collection, and it provides vector-like methods for extending it. The size
  * *cannot* be decreased because that would invalidate previously created \c
  * ItemRange items.
  *
  * \code
     auto cb = make_builder(&myintcol.host);
     cb.reserve(100);
     ItemRange<int> insertion
         = cb.insert_back(local_ints.begin(), local_ints.end());
     cb.push_back(123);
    \endcode
 
  * The CollectionBuilder can also be used to resize device-value collections
  * without having to allocate a host version and copy to device. (This is
  * useful for state allocations.) When resizing values with debugging
  * assertions enabled on host memory, it will assign garbage values to aid in
  * reproducible debugging.)
  */
 template<class T, MemSpace M = MemSpace::host, class I = ItemId<T>>
 class CollectionBuilder
 {
   public:
     //!@{
     //! \name Type aliases
     using CollectionT = Collection<T, Ownership::value, M, I>;
     using value_type = T;
     using size_type = typename CollectionT::size_type;
     using ItemIdT = typename CollectionT::ItemIdT;
     using ItemRangeT = typename CollectionT::ItemRangeT;
     //!@}
 
   public:
     //! Construct from a collection
     explicit CollectionBuilder(CollectionT* collection) : col_(*collection)
     {
         CELER_EXPECT(collection);
     }
 
     // Increase size to this capacity
     inline void resize(std::size_t count);
 
     // Reserve space
     inline void reserve(std::size_t count);
 
     // Extend with a series of elements, returning the range inserted
     template<class InputIterator>
     inline ItemRangeT insert_back(InputIterator first, InputIterator last);
 
     // Extend with a series of elements from an initializer list
     inline ItemRangeT insert_back(std::initializer_list<value_type> init);
 
     // Append a single element
     inline ItemIdT push_back(value_type const& element);
 
     //! Number of elements in the collection
     size_type size() const { return col_.size(); }
 
     //! Get the size as an ID type
     ItemIdT size_id() const { return ItemIdT{size()}; }
 
   private:
     //!@{
     //! Access storage
     using StorageT = typename CollectionT::StorageT;
     StorageT& storage() { return col_.storage(); }
     StorageT const& storage() const { return col_.storage(); }
     //!@}
 
     //! Maximum elements in a Collection
     static constexpr std::size_t max_size()
     {
         return std::numeric_limits<size_type>::max();
     }
 
     CollectionT& col_;
 };
 
 //---------------------------------------------------------------------------//
 // DEDUCTION GUIDES
 //---------------------------------------------------------------------------//
 
 template<class T, MemSpace M, class I>
 CollectionBuilder(Collection<T, Ownership::value, M, I>*)
     -> CollectionBuilder<T, M, I>;
 
 //---------------------------------------------------------------------------//
 // INLINE DEFINITIONS
 //---------------------------------------------------------------------------//
 /*!
  * Reserve space for the given number of elements.
  */
 template<class T, MemSpace M, class I>
 void CollectionBuilder<T, M, I>::reserve(std::size_t count)
 {
     CELER_EXPECT(count <= max_size());
     static_assert(M == MemSpace::host,
                   "Reserve currently works only for host memory");
     this->storage().reserve(count);
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Insert the given elements at the end of the allocation.
  */
 template<class T, MemSpace M, class I>
 template<class InputIterator>
 auto CollectionBuilder<T, M, I>::insert_back(InputIterator first,
                                              InputIterator last) -> ItemRangeT
 {
     CELER_EXPECT(std::distance(first, last) + this->storage().size()
                  <= this->max_size());
     static_assert(M == MemSpace::host,
                   "Insertion currently works only for host memory");
     auto start = this->size_id();
     this->storage().insert(this->storage().end(), first, last);
     return {start, this->size_id()};
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Insert the given list of elements at the end of the allocation.
  */
 template<class T, MemSpace M, class I>
 auto CollectionBuilder<T, M, I>::insert_back(std::initializer_list<T> init)
     -> ItemRangeT
 {
     return this->insert_back(init.begin(), init.end());
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Add a new element to the end of the allocation.
  */
 template<class T, MemSpace M, class I>
 auto CollectionBuilder<T, M, I>::push_back(T const& el) -> ItemIdT
 {
     CELER_EXPECT(this->storage().size() + 1 <= this->max_size());
     static_assert(M == MemSpace::host,
                   "Insertion currently works only for host memory");
     auto result = this->size_id();
     this->storage().push_back(el);
     return result;
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Increase the size to the given number of elements.
  */
 template<class T, MemSpace M, class I>
 void CollectionBuilder<T, M, I>::resize(std::size_t count)
 {
     CELER_EXPECT(this->storage().empty());
     CELER_EXPECT(count <= max_size());
     this->storage() = StorageT(count);
     if constexpr (CELERITAS_DEBUG && M == MemSpace::host)
     {
         // Fill with invalid values to help with debugging on host
         detail::fill_invalid(&col_);
     }
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Helper function for constructing collection builders.
  *
  * (Will not be needed under C++17's template argument deduction).
  */
 template<class T, MemSpace M, class I>
 CollectionBuilder<T, M, I>
 make_builder(Collection<T, Ownership::value, M, I>* collection)
 {
     CELER_EXPECT(collection);
     return CollectionBuilder<T, M, I>(collection);
 }
 
 //---------------------------------------------------------------------------//
 /*!
  * Helper function for resizing a single collection.
  *
  * This is useful for analogy to the resize method defined for states.
  */
 template<class T, MemSpace M, class I>
 void resize(Collection<T, Ownership::value, M, I>* collection, std::size_t size)
 {
     CELER_EXPECT(collection);
     CollectionBuilder<T, M, I>(collection).resize(size);
 }
 
 //---------------------------------------------------------------------------//
 }  // namespace celeritas

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