const crypto = window.crypto || window.msCrypto;
const alphabet = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
const radix = alphabet.length;
const array = new Uint32Array(20);
const urlParser = window.document.createElement('a');

export default {
  uid() {
    crypto.getRandomValues(array);
    return array.cl_map(value => alphabet[value % radix]).join('');
  },
  setInterval(func, interval) {
    const randomizedInterval = Math.floor((1 + ((Math.random() - 0.5) * 0.1)) * interval);
    setInterval(() => func(), randomizedInterval);
  },
  addQueryParam(url, key, value) {
    if (!url || !key || !value) {
      return url;
    }
    urlParser.href = url;
    if (urlParser.search) {
      urlParser.search += '&';
    } else {
      urlParser.search = '?';
    }
    urlParser.search += `${encodeURIComponent(key)}=${encodeURIComponent(value)}`;
    return urlParser.href;
  },
};