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#pragma once
#include "compat/int-hash.hpp"
#include "compat/defs.hpp"
#include "chunk.hpp"
#include "global-coords.hpp"
#include <cstddef>
#include <unordered_map>
#include <memory>
namespace floormat {
struct world final
{
private:
struct chunk_tuple final {
static constexpr chunk_coords invalid_coords = { -1 << 15, -1 << 15 };
chunk* c = nullptr;
chunk_coords pos = invalid_coords;
} _last_chunk;
static constexpr std::size_t initial_capacity = 64, collect_every = 64;
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, chunk, decltype(hasher)> _chunks;
std::size_t _last_collection = 0;
explicit world(std::size_t capacity);
public:
explicit world();
struct pair final { chunk& c; tile_ref t; }; // NOLINT
template<typename Hash, typename Alloc, typename Pred>
explicit world(std::unordered_map<chunk_coords, chunk, Hash, Alloc, Pred>&& chunks);
chunk& operator[](chunk_coords c) noexcept;
pair operator[](global_coords pt) noexcept;
bool contains(chunk_coords c) const noexcept;
void clear();
void collect(bool force = false);
void maybe_collect();
std::size_t size() const noexcept { return _chunks.size(); }
[[deprecated]] const auto& chunks() const noexcept { return _chunks; } // only for serialization
void serialize(StringView filename);
static world deserialize(StringView filename);
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, chunk, Hash, Alloc, Pred>&& chunks) :
world{std::max(initial_capacity, std::size_t(1/max_load_factor * 2 * chunks.size()))}
{
for (auto&& [coord, c] : chunks)
operator[](coord) = std::move(c);
}
} // namespace floormat
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