#ifndef slic3r_ShortestPath_hpp_
#define slic3r_ShortestPath_hpp_

#include "libslic3r.h"
#include "ExtrusionEntity.hpp"
#include "Point.hpp"

#include <utility>
#include <vector>

namespace ClipperLib { class PolyNode; }

namespace Slic3r {

std::vector<size_t> 				 chain_points(const Points &points, Point *start_near = nullptr);

std::vector<std::pair<size_t, bool>> chain_extrusion_entities(std::vector<ExtrusionEntity*> &entities, const Point *start_near = nullptr);
void                                 reorder_extrusion_entities(std::vector<ExtrusionEntity*> &entities, const std::vector<std::pair<size_t, bool>> &chain);
void                                 chain_and_reorder_extrusion_entities(std::vector<ExtrusionEntity*> &entities, const Point *start_near = nullptr);

std::vector<std::pair<size_t, bool>> chain_extrusion_paths(std::vector<ExtrusionPath> &extrusion_paths, const Point *start_near = nullptr);
void                                 reorder_extrusion_paths(std::vector<ExtrusionPath> &extrusion_paths, std::vector<std::pair<size_t, bool>> &chain);
void                                 chain_and_reorder_extrusion_paths(std::vector<ExtrusionPath> &extrusion_paths, const Point *start_near = nullptr);

Polylines 							 chain_polylines(Polylines &&src, const Point *start_near = nullptr);
inline Polylines 					 chain_polylines(const Polylines& src, const Point* start_near = nullptr) { Polylines tmp(src); return chain_polylines(std::move(tmp), start_near); }

std::vector<ClipperLib::PolyNode*>	 chain_clipper_polynodes(const Points &points, const std::vector<ClipperLib::PolyNode*> &items);

// Chain instances of print objects by an approximate shortest path.
// Returns pairs of PrintObject idx and instance of that PrintObject.
class Print;
struct PrintInstance;
std::vector<const PrintInstance*> 	 chain_print_object_instances(const Print &print);

// Chain lines into polylines.
Polylines 							 chain_lines(const std::vector<Line> &lines, const double point_distance_epsilon);

} // namespace Slic3r

#endif /* slic3r_ShortestPath_hpp_ */