import { MIN_YEAR_SPACE, REFERENCE_YEAR } from '../../data/const'
import { MatchEstimated, MatchExtended } from '../../types'

export default ({
  regexName,
  regexMatch,
  token,
}: MatchExtended | MatchEstimated) => {
  const charClassBases = {
    alphaLower: 26,
    alphaUpper: 26,
    alpha: 52,
    alphanumeric: 62,
    digits: 10,
    symbols: 33,
  }
  if (regexName in charClassBases) {
    return (
      charClassBases[regexName as keyof typeof charClassBases] ** token.length
    )
  }
  // TODO add more regex types for example special dates like 09.11
  // eslint-disable-next-line default-case
  switch (regexName) {
    case 'recentYear':
      // conservative estimate of year space: num years from REFERENCE_YEAR.
      // if year is close to REFERENCE_YEAR, estimate a year space of MIN_YEAR_SPACE.
      return Math.max(
        Math.abs(parseInt(regexMatch[0], 10) - REFERENCE_YEAR),
        MIN_YEAR_SPACE,
      )
  }
  return 0
}