//Copyright (c) 2020 Ultimaker B.V.
//CuraEngine is released under the terms of the AGPLv3 or higher.


#ifndef UTILS_EXTRUSION_JUNCTION_H
#define UTILS_EXTRUSION_JUNCTION_H

#include "../../Point.hpp"

namespace Slic3r::Arachne
{

/*!
 * This struct represents one vertex in an extruded path.
 *
 * It contains information on how wide the extruded path must be at this point,
 * and which perimeter it represents.
 */
struct ExtrusionJunction
{
	/*!
	 * The position of the centreline of the path when it reaches this junction.
	 * This is the position that should end up in the g-code eventually.
	 */
    Point p;

	/*!
	 * The width of the extruded path at this junction.
	 */
    coord_t w;

	/*!
	 * Which perimeter this junction is part of.
	 *
	 * Perimeters are counted from the outside inwards. The outer wall has index
	 * 0.
	 */
    size_t perimeter_index;

    ExtrusionJunction(const Point p, const coord_t w, const coord_t perimeter_index) : p(p), w(w), perimeter_index(perimeter_index) {}

    bool operator==(const ExtrusionJunction &other) const {
        return p == other.p && w == other.w && perimeter_index == other.perimeter_index;
    }

    coord_t x() const { return p.x(); }
    coord_t y() const { return p.y(); }
    coord_t z() const { return w; }
};

inline Point operator-(const ExtrusionJunction& a, const ExtrusionJunction& b)
{
    return a.p - b.p;
}

// Identity function, used to be able to make templated algorithms that do their operations on 'point-like' input.
inline const Point& make_point(const ExtrusionJunction& ej)
{
    return ej.p;
}

using LineJunctions      = std::vector<ExtrusionJunction>; //<! The junctions along a line without further information. See \ref ExtrusionLine for a more extensive class.
using ExtrusionJunctions = std::vector<ExtrusionJunction>;

}
#endif // UTILS_EXTRUSION_JUNCTION_H