class_name CockpitMeshFactory
extends RefCounted


static func add_box(
	node_name: String,
	parent: Node3D,
	position: Vector3,
	size: Vector3,
	material: Material,
	rotation_degrees: Vector3 = Vector3.ZERO
) -> MeshInstance3D:
	var instance := MeshInstance3D.new()
	instance.name = node_name
	var mesh := BoxMesh.new()
	mesh.size = size
	instance.mesh = mesh
	instance.material_override = material
	instance.position = position
	instance.rotation_degrees = rotation_degrees
	parent.add_child(instance)
	return instance


static func add_cylinder(
	node_name: String,
	parent: Node3D,
	position: Vector3,
	radius: float,
	height: float,
	material: Material,
	rotation_degrees: Vector3 = Vector3.ZERO
) -> MeshInstance3D:
	var instance := MeshInstance3D.new()
	instance.name = node_name
	var mesh := CylinderMesh.new()
	mesh.top_radius = radius
	mesh.bottom_radius = radius
	mesh.height = height
	mesh.radial_segments = 16
	instance.mesh = mesh
	instance.material_override = material
	instance.position = position
	instance.rotation_degrees = rotation_degrees
	parent.add_child(instance)
	return instance


static func add_cylinder_between(
	node_name: String,
	parent: Node3D,
	start: Vector3,
	end: Vector3,
	radius: float,
	material: Material
) -> MeshInstance3D:
	var direction := end - start
	var instance := add_cylinder(
		node_name,
		parent,
		(start + end) * 0.5,
		radius,
		direction.length(),
		material
	)
	if not direction.is_zero_approx():
		instance.quaternion = Quaternion(Vector3.UP, direction.normalized())
	return instance


static func add_sphere(
	node_name: String,
	parent: Node3D,
	position: Vector3,
	radius: float,
	material: Material
) -> MeshInstance3D:
	var instance := MeshInstance3D.new()
	instance.name = node_name
	var mesh := SphereMesh.new()
	mesh.radius = radius
	mesh.height = radius * 2.0
	mesh.radial_segments = 16
	mesh.rings = 8
	instance.mesh = mesh
	instance.material_override = material
	instance.position = position
	parent.add_child(instance)
	return instance


## Gives an imported mesh instance its own copy of its first surface material,
## so driving a property (emission) never edits the resource shared by the model.
static func own_surface_material(instance: MeshInstance3D) -> BaseMaterial3D:
	if instance == null or instance.mesh == null or instance.mesh.get_surface_count() == 0:
		return null
	var shared := instance.mesh.surface_get_material(0) as BaseMaterial3D
	if shared == null:
		return null
	var owned := shared.duplicate() as BaseMaterial3D
	instance.set_surface_override_material(0, owned)
	return owned


## Stops every mesh under `root` (root included) from casting shadows.
static func disable_shadow_casting(root: Node) -> void:
	if root == null:
		return
	var meshes: Array[Node] = root.find_children("*", "MeshInstance3D", true, false)
	meshes.append(root)
	for node: Node in meshes:
		if node is MeshInstance3D:
			(node as MeshInstance3D).cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF