import { sys } from "cc";

export default class Utils {
  /**
   *
   * @param {缓存key} key
   * @param {需要存储的缓存值} value
   * @param {过期时间} expire
   */
  static setCache(key: string, value: any, expire: number = 0): void {
    let obj = {
      data: value, //存储的数据
      time: Date.now() / 1000, //记录存储的时间戳
      expire: expire, //记录过期时间，单位秒
    };
    sys.localStorage.setItem(key, JSON.stringify(obj));
  }
  /**
   *
   * @param {缓存key} key
   */
  static getCache(key: string): any {
    let val: any = sys.localStorage.getItem(key);
    if (!val) {
      return null;
    }
    val = JSON.parse(val);
    if (val.expire && Date.now() / 1000 - val.time > val.expire) {
      sys.localStorage.removeItem(key);
      return null;
    }
    return val.data;
  }
}