extends SceneTree

var _checks := 0
var _failures := 0

func _initialize() -> void:
	call_deferred("_run")

func _run() -> void:
	print("S0: stable ID generator")
	var generator := StableIdGenerator.new()
	_expect(generator.next_id(&"guest") == &"guest.000000000001", "first ID uses a stable padded sequence")
	_expect(generator.next_id(&"guest") == &"guest.000000000002", "same prefix increments monotonically")
	_expect(generator.next_id(&"staff") == &"staff.000000000001", "prefixes have independent counters")
	var snapshot := generator.create_snapshot()
	var restored := StableIdGenerator.new()
	_expect(restored.restore_snapshot(snapshot), "valid ID counters restore")
	_expect(restored.next_id(&"guest") == &"guest.000000000003", "restored counter never reuses an ID")
	_expect(restored.next_id(&"staff") == &"staff.000000000002", "all prefix counters restore")
	var before_invalid := restored.create_snapshot()
	_expect(not restored.restore_snapshot({"version": 1, "counters": {"Bad Prefix": 2}}), "invalid prefix snapshot is rejected")
	_expect(restored.create_snapshot() == before_invalid, "rejected restore leaves counters unchanged")
	if _failures == 0:
		print("PASS: %d checks" % _checks)
	else:
		push_error("FAIL: %d of %d checks failed" % [_failures, _checks])
	quit(_failures)

func _expect(condition: bool, label: String) -> void:
	_checks += 1
	if condition:
		print("  ✓ %s" % label)
		return
	_failures += 1
	push_error("  ✗ %s" % label)