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#pragma once
#include "compat/int-hash.hpp"
#include "global-coords.hpp"
#include "tile.hpp"
#include <unordered_map>
#include <memory>
#include <optional>
namespace floormat {
// todo remove shared_ptr
struct chunk;
struct world final
{
private:
void maybe_collect();
static constexpr std::size_t initial_capacity = 64, collect_every = 32;
static constexpr float max_load_factor = .5;
static constexpr auto hasher = [](chunk_coords c) constexpr -> std::size_t {
return int_hash((std::size_t)c.y << 16 | (std::size_t)c.x);
};
std::unordered_map<chunk_coords, std::shared_ptr<chunk>, decltype(hasher)> _chunks{initial_capacity, hasher};
mutable std::optional<std::tuple<std::shared_ptr<chunk>, chunk_coords>> _last_chunk;
std::size_t _last_collection = 0;
public:
explicit world();
template<typename Hash, typename Alloc, typename Pred>
explicit world(std::unordered_map<chunk_coords, std::shared_ptr<chunk>, Hash, Alloc, Pred>&& chunks);
std::shared_ptr<chunk> operator[](chunk_coords c) noexcept;
std::tuple<std::shared_ptr<chunk>, tile&> operator[](global_coords pt) noexcept;
bool contains(chunk_coords c) const noexcept;
void clear();
void collect();
[[deprecated]] const auto& chunks() const noexcept { return _chunks; } // only for serialization
fm_DECLARE_DEPRECATED_COPY_ASSIGNMENT(world);
fm_DECLARE_DEFAULT_MOVE_ASSIGNMENT_(world);
};
template<typename Hash, typename Alloc, typename Pred>
world::world(std::unordered_map<chunk_coords, std::shared_ptr<chunk>, Hash, Alloc, Pred>&& chunks) :
_chunks{chunks.begin(), chunks.end(),
std::max(initial_capacity, std::size_t(1/max_load_factor * 2 * chunks.size())),
hasher}
{}
} // namespace floormat
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