import KVStore from "../storage/KVStore";
import DeviceId from "./DeviceId";

export class DeviceIdService {
  private static _I: DeviceIdService | null = null;
  static get I(): DeviceIdService { return this._I ?? (this._I = new DeviceIdService()); }
  private constructor(private store = new KVStore("app:")) {}

  private static KEY = "device_id";
  private _id: string | null = null;
  private _inited = false;

  /** 启动时调用：加载或生成并持久化 */
  init(): void {
    if (this._inited) return;
    const saved = this.store.get(DeviceIdService.KEY);
    if (saved) {
      this._id = saved;
    } else {
      // 如需原生ID，可先尝试原生，再用 UUID 兜底
      this._id = DeviceId.uuidv4();
      this.store.set(DeviceIdService.KEY, this._id);
    }
    this._inited = true;
  }

  /** 获取设备号（若未 init，会懒初始化一次） */
  get id(): string {
    if (!this._inited) this.init();
    // 理论上不为空，保险起见再兜底
    return this._id ?? DeviceId.uuidv4();
  }

  /** 重置（合规/调试用） */
  reset(): void {
    this.store.remove(DeviceIdService.KEY);
    this._id = null;
    this._inited = false;
  }
}
export default DeviceIdService;