const useStorage = () => Boolean(window.localStorage)

// NOTE: Generate random IDs: https://stackoverflow.com/a/2117523/3056783
const uuidv4 = () => {
  return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>
    (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
  )
}

const parseStartTimeFromiCalString = (text = '') => {
  const [ dateStr, timeStr ] = text.split('T')
  const rawDate = dateStr || ''
  const rawTime = timeStr || ''

  const year = Number(rawDate.slice(0, 4))
  const month = Number(Math.max(rawDate.slice(4, 6) - 1), 0)
  const date = Number(rawDate.slice(6, 8))
  const hour = Number(rawTime.slice(0, 2))
  const minutes = Number(rawTime.slice(2, 4))
  const seconds = Number(rawTime.slice(4, 6))

  const parsedDate = new Date(year, month, date, hour, minutes, seconds)
  return parsedDate.toString()
}

export {
  uuidv4,
  parseStartTimeFromiCalString,
  useStorage,
}