import 'package:shared_preferences/shared_preferences.dart';
import 'package:uuid/uuid.dart';

class DeviceId {
  static const _key = 'tasq_device_id';

  /// Returns a stable UUID for this installation. Generated once and persisted
  /// in `SharedPreferences`.
  static Future<String> getId() async {
    final prefs = await SharedPreferences.getInstance();
    var id = prefs.getString(_key);
    if (id != null && id.isNotEmpty) return id;
    id = const Uuid().v4();
    await prefs.setString(_key, id);
    return id;
  }

  /// For testing or explicit reset.
  static Future<void> reset() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove(_key);
  }
}