module Bob exposing (..)

import String
import Regex


hey : String -> String
hey remark =
  if isShouting remark then
    "Whoa, chill out!"
  else if isQuestion remark then
    "Sure."
  else if isSilence remark then
    "Fine. Be that way!"
  else
    "Whatever."


isShouting : String -> Bool
isShouting remark =
  isUppercase remark && hasCharacters remark


isUppercase : String -> Bool
isUppercase remark =
  remark == String.toUpper remark


isQuestion : String -> Bool
isQuestion remark =
  String.endsWith "?" remark


hasCharacters : String -> Bool
hasCharacters remark =
  Regex.contains characterRegex remark


characterRegex : Regex.Regex
characterRegex =
  Regex.regex "[a-zA-Z]"


isSilence : String -> Bool
isSilence remark =
  String.isEmpty (String.trim remark)