extends SceneTree

var failures: Array[String] = []


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


func _run() -> void:
	await process_frame
	var bus: Node = load("res://autoload/event_bus.gd").new()
	bus.name = "EventBus"
	root.add_child(bus)
	var manager: Node = load("res://autoload/time_phase_manager.gd").new()
	manager.name = "TimePhaseManager"
	root.add_child(manager)
	await process_frame

	var facts: Array = []
	bus.connect("time_phase_changed", func(previous: StringName, current: StringName, reason: StringName) -> void:
		facts.append([previous, current, reason])
	)

	_expect_equal(manager.get("current_time_phase"), &"past", "initial time phase should be past")

	manager.call("toggle_time_phase", &"time_anchor_broken")
	_expect_equal(manager.get("current_time_phase"), &"future", "toggle should switch past to future")
	_expect_int(facts.size(), 1, "toggle should broadcast one fact")
	if facts.size() == 1:
		_expect_equal(facts[0][0], &"past", "fact should carry previous phase")
		_expect_equal(facts[0][1], &"future", "fact should carry current phase")
		_expect_equal(facts[0][2], &"time_anchor_broken", "fact should carry reason")

	manager.call("set_time_phase", &"future", &"debug")
	_expect_int(facts.size(), 1, "setting the same phase should not broadcast")

	manager.call("set_time_phase", &"bogus", &"debug")
	_expect_equal(manager.get("current_time_phase"), &"future", "invalid phase values should be rejected")
	_expect_int(facts.size(), 1, "invalid phase values should not broadcast")

	manager.call("reset_to_initial", &"past")
	_expect_equal(manager.get("current_time_phase"), &"past", "reset_to_initial should apply the initial phase")
	_expect_int(facts.size(), 2, "reset that actually switches should broadcast")
	if facts.size() == 2:
		_expect_equal(facts[1][2], &"chart_init", "reset reason should be chart_init")

	manager.call("reset_to_initial", &"past")
	_expect_int(facts.size(), 2, "reset to the current phase should not broadcast")

	manager.call("reset_to_initial", &"nonsense")
	_expect_equal(manager.get("current_time_phase"), &"past", "invalid initial should fall back to past")

	_finish()


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


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


func _finish() -> void:
	if failures.is_empty():
		print("PASS time phase manager")
		quit(0)
	else:
		for failure: String in failures:
			push_error(failure)
		quit(1)