module.exports = function str_pad(input, padLength, padString, padType) {
  //  discuss at: https://locutus.io/php/str_pad/
  // original by: Kevin van Zonneveld (https://kvz.io)
  // improved by: Michael White (https://getsprink.com)
  //    input by: Marco van Oort
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  //   example 1: str_pad('Kevin van Zonneveld', 30, '-=', 'STR_PAD_LEFT')
  //   returns 1: '-=-=-=-=-=-Kevin van Zonneveld'
  //   example 2: str_pad('Kevin van Zonneveld', 30, '-', 'STR_PAD_BOTH')
  //   returns 2: '------Kevin van Zonneveld-----'

  let half = ''
  let padToGo

  const _strPadRepeater = function (s, len) {
    let collect = ''

    while (collect.length < len) {
      collect += s
    }
    collect = collect.substr(0, len)

    return collect
  }

  input += ''
  padString = padString !== undefined ? padString : ' '

  if (padType !== 'STR_PAD_LEFT' && padType !== 'STR_PAD_RIGHT' && padType !== 'STR_PAD_BOTH') {
    padType = 'STR_PAD_RIGHT'
  }
  if ((padToGo = padLength - input.length) > 0) {
    if (padType === 'STR_PAD_LEFT') {
      input = _strPadRepeater(padString, padToGo) + input
    } else if (padType === 'STR_PAD_RIGHT') {
      input = input + _strPadRepeater(padString, padToGo)
    } else if (padType === 'STR_PAD_BOTH') {
      half = _strPadRepeater(padString, Math.ceil(padToGo / 2))
      input = half + input + half
      input = input.substr(0, padLength)
    }
  }

  return input
}