import { urlAlphabet } from './url-alphabet/index.js'
if (process.env.NODE_ENV !== 'production') {
  if (
    typeof navigator !== 'undefined' &&
    navigator.product === 'ReactNative' &&
    typeof crypto === 'undefined'
  ) {
    throw new Error(
      'React Native does not have a built-in secure random generator. ' +
        'If you don’t need unpredictable IDs use `nanoid/non-secure`. ' +
        'For secure IDs, import `react-native-get-random-values` ' +
        'before Nano ID.'
    )
  }
  if (typeof msCrypto !== 'undefined' && typeof crypto === 'undefined') {
    throw new Error(
      'Import file with `if (!window.crypto) window.crypto = window.msCrypto`' +
        ' before importing Nano ID to fix IE 11 support'
    )
  }
  if (typeof crypto === 'undefined') {
    throw new Error(
      'Your browser does not have secure random generator. ' +
        'If you don’t need unpredictable IDs, you can use nanoid/non-secure.'
    )
  }
}
let random = bytes => crypto.getRandomValues(new Uint8Array(bytes))
let customRandom = (alphabet, size, getRandom) => {
  let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1
  let step = -~((1.6 * mask * size) / alphabet.length)
  return () => {
    let id = ''
    while (true) {
      let bytes = getRandom(step)
      let j = step
      while (j--) {
        id += alphabet[bytes[j] & mask] || ''
        if (id.length === size) return id
      }
    }
  }
}
let customAlphabet = (alphabet, size) => customRandom(alphabet, size, random)
let nanoid = (size = 21) => {
  let id = ''
  let bytes = crypto.getRandomValues(new Uint8Array(size))
  while (size--) {
    let byte = bytes[size] & 63
    if (byte < 36) {
      id += byte.toString(36)
    } else if (byte < 62) {
      id += (byte - 26).toString(36).toUpperCase()
    } else if (byte < 63) {
      id += '_'
    } else {
      id += '-'
    }
  }
  return id
}
export { nanoid, customAlphabet, customRandom, urlAlphabet, random }