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 counter: Node = load("res://scenes/components/streak_counter.gd").new()
	counter.name = "StreakCounter"
	root.add_child(counter)
	await process_frame

	var broadcasts: Array = []
	bus.connect("streak_changed", func(count: int) -> void:
		broadcasts.append(count)
	)

	bus.emit_signal("skill_executed", null, &"perfect")
	bus.emit_signal("skill_executed", null, &"good")
	_expect_int(int(counter.get("streak")), 2, "skill_executed should increment the streak")
	_expect_equal(str(broadcasts), str([1, 2]), "each increment should broadcast streak_changed")

	bus.emit_signal("judgement_made", &"good", 12.0, 4)
	_expect_int(int(counter.get("streak")), 2, "non-miss judgements must not clear the streak")

	bus.emit_signal("judgement_made", &"miss", 300.0, 5)
	_expect_int(int(counter.get("streak")), 0, "miss should clear the streak")
	_expect_equal(str(broadcasts), str([1, 2, 0]), "miss clear should broadcast zero")

	bus.emit_signal("judgement_made", &"miss", 300.0, 6)
	_expect_equal(str(broadcasts), str([1, 2, 0]), "already-zero streak should not rebroadcast on miss")

	bus.emit_signal("skill_executed", null, &"perfect")
	bus.emit_signal("chart_reset", &"test")
	_expect_int(int(counter.get("streak")), 0, "chart_reset should clear the streak")
	_expect_equal(str(broadcasts), str([1, 2, 0, 1, 0]), "chart_reset clear should broadcast zero")

	_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 streak counter")
		quit(0)
	else:
		for failure: String in failures:
			push_error(failure)
		quit(1)