/*************************************************************************/
/*  collision_shape.cpp                                                  */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#include "collision_shape.h"

#include "core/math/quick_hull.h"
#include "mesh_instance.h"
#include "physics_body.h"
#include "core/scene/resources/shapes/box_shape.h"
#include "core/scene/resources/shapes/capsule_shape.h"
#include "core/scene/resources/shapes/concave_polygon_shape.h"
#include "core/scene/resources/shapes/convex_polygon_shape.h"
#include "scene/resources/mesh/mesh.h"
#include "core/scene/resources/shapes/plane_shape.h"
#include "core/scene/resources/shapes/ray_shape.h"
#include "core/scene/resources/shapes/shape.h"
#include "core/scene/resources/shapes/sphere_shape.h"
#include "core/servers/rendering/rendering_server.h"

void CollisionShape::make_convex_from_brothers() {
	Node *p = get_parent();
	if (!p) {
		return;
	}

	for (int i = 0; i < p->get_child_count(); i++) {
		Node *n = p->get_child(i);
		MeshInstance *mi = Object::cast_to<MeshInstance>(n);
		if (mi) {
			Ref<Mesh> m = mi->get_mesh();
			if (m.is_valid()) {
				Ref<Shape> s = m->create_convex_shape();
				set_shape(s);
			}
		}
	}
}

void CollisionShape::_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 CollisionShape::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_PARENTED: {
			parent = Object::cast_to<CollisionObject>(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 CollisionShape::resource_changed(RES res) {
	update_gizmos();
}

String CollisionShape::get_configuration_warning() const {
	String warning = Spatial::get_configuration_warning();

	if (!Object::cast_to<CollisionObject>(get_parent())) {
		if (warning != String()) {
			warning += "\n\n";
		}
		warning += TTR("CollisionShape only serves to provide a collision shape to a CollisionObject derived node. Please only use it as a child of Area, StaticBody, RigidBody, KinematicBody, etc. to give them a shape.");
	}

	if (!shape.is_valid()) {
		if (warning != String()) {
			warning += "\n\n";
		}
		warning += TTR("A shape must be provided for CollisionShape to function. Please create a shape resource for it.");
	} else {
		if (shape->is_class("PlaneShape")) {
			if (warning != String()) {
				warning += "\n\n";
			}
			warning += TTR("Plane shapes don't work well and will be removed in future versions. Please don't use them.");
		}

		if (Object::cast_to<RigidBody>(get_parent()) &&
				Object::cast_to<ConcavePolygonShape>(*shape) &&
				Object::cast_to<RigidBody>(get_parent())->get_mode() != RigidBody::MODE_STATIC) {
			if (warning != String()) {
				warning += "\n\n";
			}
			warning += TTR("ConcavePolygonShape doesn't support RigidBody in another mode than static.");
		}
	}

	return warning;
}

#ifdef TOOLS_ENABLED
AABB CollisionShape::get_fallback_gizmo_aabb() const {
	if (shape.is_null()) {
		return Spatial::get_fallback_gizmo_aabb();
	}

	// get_debug_mesh() is not const because the mesh is lazy initialized and cached.
	// It would be better if we can mark the cache mutable and make get_debug_mesh() const.
	return const_cast<CollisionShape *>(this)->shape->get_debug_mesh()->get_aabb();
}
#endif

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

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

void CollisionShape::set_shape(const Ref<Shape> &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_warning();
}

Ref<Shape> CollisionShape::get_shape() const {
	return shape;
}

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

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

CollisionShape::CollisionShape() {
	//indicator = RID_PRIME(RenderingServer::get_singleton()->mesh_create());
	disabled = false;
	parent = nullptr;
	owner_id = 0;
	set_notify_local_transform(true);
}

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