extends SceneTree

var failures: Array[String] = []


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


func _run() -> void:
	root.size = Vector2i(1152, 648)
	var main_scene: PackedScene = load("res://scenes/main/main.tscn")
	if main_scene == null:
		failures.append("main.tscn should load")
		_finish()
		return
	var main := main_scene.instantiate()
	root.add_child(main)
	await process_frame

	_expect_bool(main.get_node_or_null("UILayer") is CanvasLayer, true, "Main UI should stay in the x1 CanvasLayer")
	var ui := main.get_node_or_null("UILayer/UI") as Control
	_expect_bool(ui != null, true, "Main UI should be under UILayer/UI")
	if ui != null:
		_expect_vector(ui.position, Vector2.ZERO, "Main UI should start at the viewport origin inside the CanvasLayer")
		_expect_vector(ui.size, Vector2(1152.0, 648.0), "Main UI should fill the viewport")
		_expect_vector(ui.scale, Vector2.ONE, "Main UI should not counter-scale against the world camera")

	main.queue_free()
	await process_frame
	_finish()


func _expect_vector(actual: Vector2, expected: Vector2, label: String) -> void:
	if actual.distance_to(expected) > 0.03:
		failures.append("%s: expected %s, got %s" % [label, expected, actual])


func _expect_bool(actual: bool, expected: bool, label: String) -> void:
	if actual != expected:
		failures.append("%s: expected %s, got %s" % [label, expected, actual])


func _finish() -> void:
	if failures.is_empty():
		print("PASS main ui camera canvas")
		quit(0)
	else:
		for failure: String in failures:
			push_error(failure)
		quit(1)