rexxars/vinmonopolet

const numberFilter = require('./number')

const units = {
  ml: 1000,
  cl: 100,
  dl: 10,
  l: 1, // eslint-disable-line id-length
  liter: 1
}

module.exports = function volumeFilter(val) {
  if (!val) {
    return null
  } else if (typeof val === 'number') {
    return val
  }

  const unit = val.match(/(ml|cl|dl|l|liter)/) || []
  const amount = numberFilter.greedy(val)
  const factor = units[unit[1]] || 1

  return amount / factor
}