import { isNode } from './env';

export function base64UrlEncode(string: string): string {
  return btoa(String(string))
    .replace(/\+/, '-')
    .replace(new RegExp('\\/'), '_')
    .replace(/=+$/, '');
}

export function base64UrlDecode(string: string): string {
  return atob(
    String(string)
      .replace(/-/, '+')
      .replace(/_/, '/')
  );
}

export function uid(prefix: string = '', timebase: boolean = false): string {
  if (timebase) {
    const start = performance?.timeOrigin
      ? Math.round(performance.timeOrigin)
      : performance.timing.navigationStart;

    const time = (start * 100000) + (performance.now() * 100);

    return prefix + time.toString(12) + (randomBytesString(4));
  }

  return prefix + randomBytesString(12);
}

export function tid(prefix: string = ''): string {
  return uid(prefix, true);
}

export function randomBytesString(size: number = 12): string {
  if (!isNode() && !globalThis.crypto) {
    return String(Math.floor(Math.random() * (size ** 10)));
  }

  return Array.from(randomBytes(size))
    .map(x => x.toString(16).padStart(2, '0'))
    .join('');
}

export function randomBytes(size: number = 12): Uint8Array {
  const arr = new Uint8Array(size);
  globalThis.crypto.getRandomValues(arr);
  return arr;
}

export const STR_SEED_BASE32 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
export const STR_SEED_BASE32HEX = '0123456789ABCDEFGHIJKLMNOPQRSTUV';
export const STR_SEED_BASE36 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
export const STR_SEED_BASE58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
export const STR_SEED_BASE64SAFE = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
export const STR_SEED_BASE62 = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

export function randomString(length: number, characters: string = STR_SEED_BASE62): string {
  let result = '';
  const charactersLength = characters.length;

  for (let i = 0; i < length; i++) {
    result += characters.charAt(Math.floor(Math.random() * charactersLength));
  }

  return result;
}