const units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB']

export function humanStorageSize(bytes, decimals = 1) {
  let u = 0

  while (parseInt(bytes, 10) >= 1024 && u < units.length - 1) {
    bytes /= 1024
    ++u
  }

  return `${bytes.toFixed(decimals)}${units[u]}`
}

export function capitalize(str) {
  return str.charAt(0).toUpperCase() + str.slice(1)
}

export function between(v, min, max) {
  return max <= min ? min : Math.min(max, Math.max(min, v))
}

export function normalizeToInterval(v, min, max) {
  if (max <= min) {
    return min
  }

  const size = max - min + 1

  let index = min + ((v - min) % size)
  if (index < min) {
    index = size + index
  }

  return index === 0 ? 0 : index // fix for (-a % a) => -0
}

export function pad(v, length = 2, char = '0') {
  if (v === void 0 || v === null) {
    return v
  }

  const val = String(v)
  return val.length >= length
    ? val
    : new Array(length - val.length + 1).join(char) + val
}

export default {
  humanStorageSize,
  capitalize,
  between,
  normalizeToInterval,
  pad
}
