class IdUtils {
  public static genUUID() {
    if (typeof crypto === "object") {
      if (typeof crypto.randomUUID === "function") {
        return crypto.randomUUID();
      }
      if (
        typeof crypto.getRandomValues === "function" &&
        typeof Uint8Array === "function"
      ) {
        const callback = c => {
          const num = Number(c);
          return (
            num ^
            (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (num / 4)))
          ).toString(16);
        };
        return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, callback);
      }
    }
    let timestamp = new Date().getTime();
    let perforNow =
      (typeof performance !== "undefined" &&
        performance.now &&
        performance.now() * 1000) ||
      0;
    return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, c => {
      let random = Math.random() * 16;
      if (timestamp > 0) {
        random = (timestamp + random) % 16 | 0;
        timestamp = Math.floor(timestamp / 16);
      } else {
        random = (perforNow + random) % 16 | 0;
        perforNow = Math.floor(perforNow / 16);
      }
      return (c === "x" ? random : (random & 0x3) | 0x8).toString(16);
    });
  }
}