/*************************************************************************/
/*  concave_polygon_shape_2d.cpp                                         */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "concave_polygon_shape_2d.h"

#include "core/math/geometry_2d.h"
#include "servers/physics_server_2d.h"
#include "servers/rendering_server.h"

bool ConcavePolygonShape2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {
	Vector<Vector2> s = get_segments();
	int len = s.size();
	if (len == 0 || (len % 2) == 1) {
		return false;
	}

	const Vector2 *r = s.ptr();
	for (int i = 0; i < len; i += 2) {
		Vector2 closest = Geometry2D::get_closest_point_to_segment(p_point, &r[i]);
		if (p_point.distance_to(closest) < p_tolerance) {
			return true;
		}
	}

	return false;
}

void ConcavePolygonShape2D::set_segments(const Vector<Vector2> &p_segments) {
	PhysicsServer2D::get_singleton()->shape_set_data(get_rid(), p_segments);
	emit_changed();
}

Vector<Vector2> ConcavePolygonShape2D::get_segments() const {
	return PhysicsServer2D::get_singleton()->shape_get_data(get_rid());
}

void ConcavePolygonShape2D::draw(const RID &p_to_rid, const Color &p_color) {
	Vector<Vector2> s = get_segments();
	int len = s.size();
	if (len == 0 || (len % 2) == 1) {
		return;
	}

	const Vector2 *r = s.ptr();
	for (int i = 0; i < len; i += 2) {
		RenderingServer::get_singleton()->canvas_item_add_line(p_to_rid, r[i], r[i + 1], p_color, 2);
	}
}

Rect2 ConcavePolygonShape2D::get_rect() const {
	Vector<Vector2> s = get_segments();
	int len = s.size();
	if (len == 0) {
		return Rect2();
	}

	Rect2 rect;

	const Vector2 *r = s.ptr();
	for (int i = 0; i < len; i++) {
		if (i == 0) {
			rect.position = r[i];
		} else {
			rect.expand_to(r[i]);
		}
	}

	return rect;
}

real_t ConcavePolygonShape2D::get_enclosing_radius() const {
	Vector<Vector2> data = get_segments();
	const Vector2 *read = data.ptr();
	real_t r = 0.0;
	for (int i(0); i < data.size(); i++) {
		r = MAX(read[i].length_squared(), r);
	}
	return Math::sqrt(r);
}

void ConcavePolygonShape2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_segments", "segments"), &ConcavePolygonShape2D::set_segments);
	ClassDB::bind_method(D_METHOD("get_segments"), &ConcavePolygonShape2D::get_segments);

	ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR2_ARRAY, "segments"), "set_segments", "get_segments");
}

ConcavePolygonShape2D::ConcavePolygonShape2D() :
		Shape2D(PhysicsServer2D::get_singleton()->concave_polygon_shape_create()) {
	Vector<Vector2> empty;
	set_segments(empty);
}