/*************************************************************************/
/*  occluder_shape_polygon.cpp                                           */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "occluder_shape_polygon.h"

#include "servers/visual_server.h"

#ifdef TOOLS_ENABLED
void OccluderShapePolygon::_update_aabb() {
	_aabb_local = AABB();

	if (_poly_pts_local.size()) {
		Vector3 begin = _vec2to3(_poly_pts_local[0]);
		Vector3 end = begin;

		for (int n = 1; n < _poly_pts_local.size(); n++) {
			Vector3 pt = _vec2to3(_poly_pts_local[n]);
			begin.x = MIN(begin.x, pt.x);
			begin.y = MIN(begin.y, pt.y);
			begin.z = MIN(begin.z, pt.z);
			end.x = MAX(end.x, pt.x);
			end.y = MAX(end.y, pt.y);
			end.z = MAX(end.z, pt.z);
		}

		for (int n = 0; n < _hole_pts_local.size(); n++) {
			Vector3 pt = _vec2to3(_hole_pts_local[n]);
			begin.x = MIN(begin.x, pt.x);
			begin.y = MIN(begin.y, pt.y);
			begin.z = MIN(begin.z, pt.z);
			end.x = MAX(end.x, pt.x);
			end.y = MAX(end.y, pt.y);
			end.z = MAX(end.z, pt.z);
		}

		_aabb_local.position = begin;
		_aabb_local.size = end - begin;
	}
}

AABB OccluderShapePolygon::get_fallback_gizmo_aabb() const {
	return _aabb_local;
}

#endif

void OccluderShapePolygon::_sanitize_points_internal(const PoolVector<Vector2> &p_from, Vector<Vector2> &r_to) {
	// remove duplicates? NYI maybe not necessary
	Vector<Vector2> raw;
	raw.resize(p_from.size());
	for (int n = 0; n < p_from.size(); n++) {
		raw.set(n, p_from[n]);
	}

	// this function may get rid of some concave points due to user editing ..
	// may not be necessary, no idea how fast it is
	r_to = Geometry::convex_hull_2d(raw);

	// some peculiarity of convex_hull_2d function, it duplicates the last point for some reason
	if (r_to.size() > 1) {
		r_to.resize(r_to.size() - 1);
	}

	// sort winding, the system expects counter clockwise polys
	Geometry::sort_polygon_winding(r_to, false);
}

void OccluderShapePolygon::_sanitize_points() {
	_sanitize_points_internal(_poly_pts_local_raw, _poly_pts_local);
	_sanitize_points_internal(_hole_pts_local_raw, _hole_pts_local);

#ifdef TOOLS_ENABLED
	_update_aabb();
#endif
}

void OccluderShapePolygon::set_polygon_point(int p_idx, const Vector2 &p_point) {
	if (p_idx >= _poly_pts_local_raw.size()) {
		return;
	}

	_poly_pts_local_raw.set(p_idx, p_point);
	_sanitize_points();
	update_shape_to_visual_server();
	notify_change_to_owners();
}

void OccluderShapePolygon::set_hole_point(int p_idx, const Vector2 &p_point) {
	if (p_idx >= _hole_pts_local_raw.size()) {
		return;
	}

	_hole_pts_local_raw.set(p_idx, p_point);
	_sanitize_points();
	update_shape_to_visual_server();
	notify_change_to_owners();
}

void OccluderShapePolygon::set_polygon_points(const PoolVector<Vector2> &p_points) {
	_poly_pts_local_raw = p_points;
	_sanitize_points();
	update_shape_to_visual_server();
	notify_change_to_owners();
}

void OccluderShapePolygon::set_hole_points(const PoolVector<Vector2> &p_points) {
	_hole_pts_local_raw = p_points;
	_sanitize_points();
	update_shape_to_visual_server();
	notify_change_to_owners();
}

PoolVector<Vector2> OccluderShapePolygon::get_polygon_points() const {
	return _poly_pts_local_raw;
}

PoolVector<Vector2> OccluderShapePolygon::get_hole_points() const {
	return _hole_pts_local_raw;
}

void OccluderShapePolygon::update_shape_to_visual_server() {
	if (_poly_pts_local.size() < 3)
		return;

	Geometry::OccluderMeshData md;
	md.faces.resize(1);

	Geometry::OccluderMeshData::Face &face = md.faces[0];
	face.two_way = is_two_way();

	md.vertices.resize(_poly_pts_local.size() + _hole_pts_local.size());
	face.indices.resize(_poly_pts_local.size());

	for (int n = 0; n < _poly_pts_local.size(); n++) {
		md.vertices[n] = _vec2to3(_poly_pts_local[n]);
		face.indices[n] = n;
	}

	// hole points
	if (_hole_pts_local.size()) {
		face.holes.resize(1);
		Geometry::OccluderMeshData::Hole &hole = face.holes[0];
		hole.indices.resize(_hole_pts_local.size());

		for (int n = 0; n < _hole_pts_local.size(); n++) {
			int dest_idx = n + _poly_pts_local.size();

			hole.indices[n] = dest_idx;
			md.vertices[dest_idx] = _vec2to3(_hole_pts_local[n]);
		}
	}

	face.plane = Plane(Vector3(0, 0, 0), Vector3(0, 0, -1));

	RenderingServer::get_singleton()->occluder_resource_mesh_update(get_shape(), md);
}

void OccluderShapePolygon::set_two_way(bool p_two_way) {
	_settings_two_way = p_two_way;
	update_shape_to_visual_server();
	notify_change_to_owners();
}

Transform OccluderShapePolygon::center_node(const Transform &p_global_xform, const Transform &p_parent_xform, real_t p_snap) {
	return Transform();
}

void OccluderShapePolygon::clear() {
	_poly_pts_local.clear();
	_poly_pts_local_raw.resize(0);
	_hole_pts_local.clear();
	_hole_pts_local_raw.resize(0);
#ifdef TOOLS_ENABLED
	_aabb_local = AABB();
#endif
}

void OccluderShapePolygon::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_two_way", "two_way"), &OccluderShapePolygon::set_two_way);
	ClassDB::bind_method(D_METHOD("is_two_way"), &OccluderShapePolygon::is_two_way);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "two_way"), "set_two_way", "is_two_way");

	ClassDB::bind_method(D_METHOD("set_polygon_points", "points"), &OccluderShapePolygon::set_polygon_points);
	ClassDB::bind_method(D_METHOD("get_polygon_points"), &OccluderShapePolygon::get_polygon_points);

	ClassDB::bind_method(D_METHOD("set_polygon_point", "index", "position"), &OccluderShapePolygon::set_polygon_point);

	ADD_PROPERTY(PropertyInfo(Variant::POOL_VECTOR2_ARRAY, "polygon_points"), "set_polygon_points", "get_polygon_points");

	ClassDB::bind_method(D_METHOD("set_hole_points", "points"), &OccluderShapePolygon::set_hole_points);
	ClassDB::bind_method(D_METHOD("get_hole_points"), &OccluderShapePolygon::get_hole_points);
	ClassDB::bind_method(D_METHOD("set_hole_point", "index", "position"), &OccluderShapePolygon::set_hole_point);

	ADD_PROPERTY(PropertyInfo(Variant::POOL_VECTOR2_ARRAY, "hole_points"), "set_hole_points", "get_hole_points");
}

OccluderShapePolygon::OccluderShapePolygon() {
	if (get_shape().is_valid()) {
		RenderingServer::get_singleton()->occluder_resource_prepare(get_shape(), RenderingServer::OCCLUDER_TYPE_MESH);
	}

	clear();

	PoolVector<Vector2> points;
	points.resize(4);
	points.set(0, Vector2(1, -1));
	points.set(1, Vector2(1, 1));
	points.set(2, Vector2(-1, 1));
	points.set(3, Vector2(-1, -1));

	set_polygon_points(points); // default shape
}