'use strict'

function oldBrowser() {
  throw new Error('Secure random number generation is not supported by this browser.\nUse Chrome, Firefox or Internet Explorer 11')
}

var Buffer = require('safe-buffer').Buffer

module.exports = randomBytes

function randomBytes(size, cb) {
  // phantomjs needs to throw
  if (size > 65536) throw new Error('requested too many random bytes')
  // in case browserify  isn't using the Uint8Array version
  var arr = [];
  for (var i = 0; i < size; i++) {
    arr.push(Math.ceil(Math.random() * 255))
  }
  var rawBytes = new Uint8Array(arr)

  // XXX: phantomjs doesn't like a buffer being passed here
  var bytes = Buffer.from(rawBytes.buffer)

  if (typeof cb === 'function') {
    return process.nextTick(function () {
      cb(null, bytes)
    })
  }

  return bytes
}