const isNode = typeof window === 'undefined';

const btoa = isNode ? (str: string) => Buffer.from(str).toString('base64') : window.btoa;
const atob = isNode ? (str: string) => Buffer.from(str, 'base64').toString() : window.atob;

/**
 * toBase64({ name:'james', age:18 }, 3);
 * @param {object} data
 * @param {number} len
 * @returns {string} base64 => MWL4QXLoPmX6TlX|QWL|epIw]VX|QWL|MWL4P3HoPmX|PpskeZY}MWL4PmLoPmX|T|X|QWL|\ZgoMWL4PmLoPmX}TWH7MWL4Q3ToPmX4UD@@
 */
const toBase64 = (data: object, push = 1) => {
  let result = '';
  btoa(encodeURIComponent(escape(JSON.stringify(data))))
    .split('')
    .forEach((e) => {
      result += String.fromCharCode(e.charCodeAt(0) + push);
    });
  return result;
};

/**
 * toJson('MWL4QXLoPmX6TlX|QWL|epIw]VX|QWL|MWL4P3HoPmX|PpskeZY}MWL4PmLoPmX|T|X|QWL|\ZgoMWL4PmLoPmX}TWH7MWL4Q3ToPmX4UD@@', 3);
 * @param {string} str
 * @param {number} len
 * @returns // => { name:'james', age:18 }
 */
const toJson = (str: string, push = 1) => {
  try {
    let result = '';
    str.split('').forEach((e) => {
      result += String.fromCharCode(e.charCodeAt(0) - push);
    });
    return JSON.parse(unescape(decodeURIComponent(atob(result))));
  } catch {
    return false;
  }
};

const Atobtoa = { toBase64, toJson };

export default Atobtoa;
export { toBase64, toJson };