/*************************************************************************/
/*  collision_shape_3d.cpp                                               */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#include "collision_shape_3d.h"

#include "core/math/quick_hull.h"
#include "mesh_instance_3d.h"
#include "physics_body_3d.h"
#include "scene/resources/concave_polygon_shape_3d.h"
#include "scene/resources/convex_polygon_shape_3d.h"
#include "servers/rendering_server.h"

void CollisionShape3D::make_convex_from_siblings() {
	Node *p = get_parent();
	if (!p) {
		return;
	}

	Vector<Vector3> vertices;

	for (int i = 0; i < p->get_child_count(); i++) {
		Node *n = p->get_child(i);
		MeshInstance3D *mi = Object::cast_to<MeshInstance3D>(n);
		if (mi) {
			Ref<Mesh> m = mi->get_mesh();
			if (m.is_valid()) {
				for (int j = 0; j < m->get_surface_count(); j++) {
					Array a = m->surface_get_arrays(j);
					if (!a.is_empty()) {
						Vector<Vector3> v = a[RenderingServer::ARRAY_VERTEX];
						for (int k = 0; k < v.size(); k++) {
							vertices.append(mi->get_transform().xform(v[k]));
						}
					}
				}
			}
		}
	}

	Ref<ConvexPolygonShape3D> shape = memnew(ConvexPolygonShape3D);
	shape->set_points(vertices);
	set_shape(shape);
}

void CollisionShape3D::_update_in_shape_owner(bool p_xform_only) {
	parent->shape_owner_set_transform(owner_id, get_transform());
	if (p_xform_only) {
		return;
	}
	parent->shape_owner_set_disabled(owner_id, disabled);
}

void CollisionShape3D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_PARENTED: {
			parent = Object::cast_to<CollisionObject3D>(get_parent());
			if (parent) {
				owner_id = parent->create_shape_owner(this);
				if (shape.is_valid()) {
					parent->shape_owner_add_shape(owner_id, shape);
				}
				_update_in_shape_owner();
			}
		} break;
		case NOTIFICATION_ENTER_TREE: {
			if (parent) {
				_update_in_shape_owner();
			}
		} break;
		case NOTIFICATION_LOCAL_TRANSFORM_CHANGED: {
			if (parent) {
				_update_in_shape_owner(true);
			}
		} break;
		case NOTIFICATION_UNPARENTED: {
			if (parent) {
				parent->remove_shape_owner(owner_id);
			}
			owner_id = 0;
			parent = nullptr;
		} break;
	}
}

void CollisionShape3D::resource_changed(RES res) {
	update_gizmos();
}

TypedArray<String> CollisionShape3D::get_configuration_warnings() const {
	TypedArray<String> warnings = Node::get_configuration_warnings();

	if (!Object::cast_to<CollisionObject3D>(get_parent())) {
		warnings.push_back(TTR("CollisionShape3D only serves to provide a collision shape to a CollisionObject3D derived node. Please only use it as a child of Area3D, StaticBody3D, RigidBody3D, CharacterBody3D, etc. to give them a shape."));
	}

	if (!shape.is_valid()) {
		warnings.push_back(TTR("A shape must be provided for CollisionShape3D to function. Please create a shape resource for it."));
	}

	if (shape.is_valid() &&
			Object::cast_to<RigidBody3D>(get_parent()) &&
			Object::cast_to<ConcavePolygonShape3D>(*shape) &&
			Object::cast_to<RigidBody3D>(get_parent())->get_mode() != RigidBody3D::MODE_STATIC) {
		warnings.push_back(TTR("ConcavePolygonShape3D doesn't support RigidBody3D in another mode than static."));
	}

	return warnings;
}

void CollisionShape3D::_bind_methods() {
	//not sure if this should do anything
	ClassDB::bind_method(D_METHOD("resource_changed", "resource"), &CollisionShape3D::resource_changed);
	ClassDB::bind_method(D_METHOD("set_shape", "shape"), &CollisionShape3D::set_shape);
	ClassDB::bind_method(D_METHOD("get_shape"), &CollisionShape3D::get_shape);
	ClassDB::bind_method(D_METHOD("set_disabled", "enable"), &CollisionShape3D::set_disabled);
	ClassDB::bind_method(D_METHOD("is_disabled"), &CollisionShape3D::is_disabled);
	ClassDB::bind_method(D_METHOD("make_convex_from_siblings"), &CollisionShape3D::make_convex_from_siblings);
	ClassDB::set_method_flags("CollisionShape3D", "make_convex_from_siblings", METHOD_FLAGS_DEFAULT | METHOD_FLAG_EDITOR);

	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "shape", PROPERTY_HINT_RESOURCE_TYPE, "Shape3D"), "set_shape", "get_shape");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "disabled"), "set_disabled", "is_disabled");
}

void CollisionShape3D::set_shape(const Ref<Shape3D> &p_shape) {
	if (p_shape == shape) {
		return;
	}
	if (!shape.is_null()) {
		shape->unregister_owner(this);
	}
	shape = p_shape;
	if (!shape.is_null()) {
		shape->register_owner(this);
	}
	update_gizmos();
	if (parent) {
		parent->shape_owner_clear_shapes(owner_id);
		if (shape.is_valid()) {
			parent->shape_owner_add_shape(owner_id, shape);
		}
	}

	if (is_inside_tree() && parent) {
		// If this is a heightfield shape our center may have changed
		_update_in_shape_owner(true);
	}
	update_configuration_warnings();
}

Ref<Shape3D> CollisionShape3D::get_shape() const {
	return shape;
}

void CollisionShape3D::set_disabled(bool p_disabled) {
	disabled = p_disabled;
	update_gizmos();
	if (parent) {
		parent->shape_owner_set_disabled(owner_id, p_disabled);
	}
}

bool CollisionShape3D::is_disabled() const {
	return disabled;
}

CollisionShape3D::CollisionShape3D() {
	//indicator = RenderingServer::get_singleton()->mesh_create();
	set_notify_local_transform(true);
}

CollisionShape3D::~CollisionShape3D() {
	if (!shape.is_null()) {
		shape->unregister_owner(this);
	}
	//RenderingServer::get_singleton()->free(indicator);
}