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Filename : friendlyBytes.js
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//
// Copyright (C) 2014 - present Instructure, Inc.
//
// This file is part of Canvas.
//
// Canvas is free software: you can redistribute it and/or modify it under
// the terms of the GNU Affero General Public License as published by the Free
// Software Foundation, version 3 of the License.
//
// Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.

import I18n from '@canvas/i18n'

const units = ['byte', 'bytes', 'KB', 'MB', 'GB', 'TB']

// converts bytes into a nice representation with unit. e.g. 13661855 -> 13.7 MB, 825399 -> 825 KB, 1396 -> 1 KB
export default function friendlyBytes(value) {
  let resInt, resValue
  const bytes = parseInt(value, 10)
  if (bytes.toString() === 'NaN') return '--'

  if (bytes === 0) {
    resInt = resValue = 0
  } else {
    resInt = Math.floor(Math.log(bytes) / Math.log(1000)) // base 10 (rather than 1024) matches Mac OS X
    resValue = (bytes / Math.pow(1000, Math.floor(resInt))).toFixed(resInt < 2 ? 0 : 1) // no decimals for anything smaller than 1 MB
    if (bytes === 1) resInt = -1 // 1 byte special case
  }

  return `${I18n.n(resValue)} ${units[resInt + 1]}`
}