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#pragma once
#include "tile-defs.hpp"
#include "global-coords.hpp"
#include "object-id.hpp"
#include "rotation.hpp"
#include "world.hpp"
#include "compat/function2.fwd.hpp"
#include <array>
#include <bitset>
#include <memory>
#include <Corrade/Containers/Array.h>
#include <Corrade/Containers/BitArray.h>
#include <Corrade/Containers/StridedDimensions.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/DimensionTraits.h>
namespace Corrade::Containers {
template<typename T> class Optional;
template<typename T, typename U> class Pair;
} // namespace Corrade::Containers
namespace floormat {
struct world;
struct object;
struct chunk;
struct path_search_result;
class path_search;
struct path_search_result final
{
friend class path_search;
path_search_result();
size_t size() const;
const global_coords& operator[](size_t index) const;
explicit operator ArrayView<global_coords>() const;
const global_coords* begin() const;
const global_coords* cbegin() const;
const global_coords* end() const;
const global_coords* cend() const;
const global_coords* data() const;
private:
mutable path_search_result* _next = nullptr;
std::unique_ptr<global_coords[]> _path;
size_t _size = 0;
};
enum class path_search_continue : bool { pass = false, blocked = true };
class path_search final
{
// todo bucketize by array length
path_search_result* pool = nullptr;
public:
static constexpr int subdivide_factor = 4;
static constexpr auto min_size = iTILE_SIZE2 / subdivide_factor / 2;
static constexpr size_t tile_count = Vector2i(subdivide_factor * TILE_MAX_DIM).product();
struct neighbors final
{
auto begin() const { return neighbors.data(); }
auto end() const { return neighbors.data() + size; }
std::array<global_coords, 4> neighbors;
uint8_t size = 0;
};
struct chunk_tiles_cache
{
std::bitset<tile_count> can_go_north{true}, can_go_west{true};
};
struct chunk_cache
{
Array<chunk_tiles_cache> array;
Vector2i start, size; // in chunks
};
struct obj_position { Vector2 center, size; };
chunk_cache cache;
Array<global_coords> output;
template<typename T> struct bbox { VectorTypeFor<2, T> min, max; };
using pred = fu2::function_view<path_search_continue(collision_data) const>;
static const pred& never_continue() noexcept;
static const pred& always_continue() noexcept;
void ensure_allocated(chunk_coords a, chunk_coords b);
void fill_cache(world& w, Vector2i cmin, Vector2i cmax, int8_t z, Vector2ub own_size, object_id own_id, const pred& p = never_continue());
void fill_cache_(world& w, chunk_coords_ coord, Vector2ub own_size, object_id own_id, const pred& p = never_continue());
// todo remember to check from.z() == to.z()
// todo add simple bresenham short-circuit
Optional<path_search_result> dijkstra(world& w, Vector2ub own_size, object_id own_id, global_coords from, Vector2b from_offset, global_coords to, Vector2b to_offset, const pred& p = never_continue());
Optional<path_search_result> dijkstra(world& w, const object& obj, global_coords to, Vector2b to_offset, const pred& p = never_continue());
static bool is_passable_1(chunk& c, Vector2 min, Vector2 max, object_id own_id, const pred& p = never_continue());
static bool is_passable_(chunk* c0, const std::array<world::neighbor_pair, 8>& neighbors,
Vector2 min, Vector2 max, object_id own_id, const pred& p = never_continue());
static bool is_passable(world& w, chunk_coords_ ch0, Vector2 min, Vector2 max, object_id own_id, const pred& p = never_continue());
static bool is_passable(world& w, global_coords coord, Vector2b offset, Vector2ub size, object_id own_id, const pred& p = never_continue());
static bbox<float> make_neighbor_tile_bbox(Vector2i coord, Vector2ub own_size, Vector2ub div, rotation r);
static bbox<float> bbox_union(bbox<float> bb, Vector2i coord, Vector2b offset, Vector2ub size);
static neighbors get_walkable_neighbor_tiles(world& w, global_coords coord, Vector2ub size, object_id own_id, const pred& p = never_continue());
};
} // namespace floormat
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