extends SceneTree

var failures: Array[String] = []


func _init() -> void:
	_run.call_deferred()


func _run() -> void:
	var scene: PackedScene = load("res://scenes/main/main.tscn")
	if scene == null:
		push_error("Could not load main.tscn")
		quit(1)
		return
	
	var main: Node = scene.instantiate()
	var initial_left_mover: Control = main.get_node("RhythmFeedback/RhythmTrack/LeftMover")
	var initial_right_mover: Control = main.get_node("RhythmFeedback/RhythmTrack/RightMover")
	var initial_center_base: Control = main.get_node("RhythmFeedback/RhythmTrack/CenterBase")
	var initial_center_flash: Control = main.get_node("RhythmFeedback/RhythmTrack/CenterFlash")
	var expected_left_start := _control_center(initial_left_mover)
	var expected_right_start := _control_center(initial_right_mover)
	var expected_track_center := _control_center(initial_center_base)
	var expected_mover_size := initial_left_mover.size
	var expected_center_flash_size := initial_center_flash.size
	
	root.add_child(main)
	await process_frame
	
	_expect_vector("left_mover_start", main.get("left_mover_start"), expected_left_start)
	_expect_vector("right_mover_start", main.get("right_mover_start"), expected_right_start)
	_expect_vector("track_center", main.get("track_center"), expected_track_center)
	_expect_vector("mover_size", main.get("mover_size"), expected_mover_size)
	_expect_vector("center_flash_size", main.get("center_flash_size"), expected_center_flash_size)
	
	main.free()
	
	if failures.is_empty():
		print("PASS rhythm ui layout")
		quit(0)
	else:
		for failure: String in failures:
			push_error(failure)
		quit(1)


func _control_center(control: Control) -> Vector2:
	return Vector2(
		(control.offset_left + control.offset_right) * 0.5,
		(control.offset_top + control.offset_bottom) * 0.5
	)


func _expect_vector(label: String, actual: Variant, expected: Vector2) -> void:
	if not actual is Vector2:
		failures.append("%s should be cached as Vector2, got %s" % [label, typeof(actual)])
		return
	if not (actual as Vector2).is_equal_approx(expected):
		failures.append("%s should match scene layout: expected %s got %s" % [label, expected, actual])