class_name DebugCollisionShapes
extends RefCounted

const MARGIN = 0.01

var is_visible: bool = true

var _mesh_nodes: Array[MeshInstance3D] = []


func init(children: Array[Node], parent: Node, material: Material) -> void:
	for child in children:
		if child is not CollisionShape3D:
			continue
		var shape_node: CollisionShape3D = child as CollisionShape3D
		if shape_node.shape == null:
			continue

		var mesh_node := MeshInstance3D.new()
		if shape_node.shape is BoxShape3D:
			var shape := shape_node.shape as BoxShape3D
			var mesh := BoxMesh.new()
			mesh.size = shape.size
			mesh_node.mesh = mesh
		if shape_node.shape is CapsuleShape3D:
			var shape := shape_node.shape as CapsuleShape3D
			var mesh := CapsuleMesh.new()
			mesh.radius = shape.radius + MARGIN
			mesh.height = shape.height + MARGIN
			mesh.radial_segments = 8
			mesh.rings = 1
			mesh_node.mesh = mesh
		if shape_node.shape is SphereShape3D:
			var shape := shape_node.shape as SphereShape3D
			var mesh := SphereMesh.new()
			mesh.radius = shape.radius + MARGIN
			mesh.height = shape.radius * 2 + MARGIN
			mesh.radial_segments = 8
			mesh.rings = 4
			mesh_node.mesh = mesh
		if shape_node.shape is CylinderShape3D:
			var shape := shape_node.shape as CylinderShape3D
			var mesh := CylinderMesh.new()
			mesh.top_radius = shape.radius + MARGIN
			mesh.bottom_radius = shape.radius + MARGIN
			mesh.height = shape.height + MARGIN
			mesh.radial_segments = 8
			mesh.rings = 0
			mesh_node.mesh = mesh

		mesh_node.material_override = material
		mesh_node.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
		mesh_node.visible = Debugger.mode == Debugger.Mode.FULL
		parent.add_child(mesh_node)
		mesh_node.global_transform = (child as Node3D).global_transform
		_mesh_nodes.append(mesh_node)

	Debugger.mode_changed.connect(_on_debugger_mode_changed)


func set_visibility(visible: bool) -> void:
	is_visible = visible
	for node in _mesh_nodes:
		node.visible = is_visible and Debugger.mode == Debugger.Mode.FULL


func _on_debugger_mode_changed(mode: Debugger.Mode) -> void:
	for mesh_node in _mesh_nodes:
		mesh_node.visible = mode == Debugger.Mode.FULL