module Update.UpdateTimerEdition
  ( updateTimerEdition
  , TimerEditionAction(..)
  ) where

import Char (..)

import Model.TimerEdition (..)

import Utils.List (..)

type TimerEditionAction =
  DeleteLast
  | AddNumber KeyCode

updateTimerEdition : TimerEditionAction -> TimerEdition -> TimerEdition
updateTimerEdition action timerEdition =
  case action of
    DeleteLast ->
      case maybeTail timerEdition.numbers of
        Just tailNumbers ->
          { timerEdition | numbers <- tailNumbers }
        Nothing ->
          timerEdition
    AddNumber keyCode ->
      case keyCodeToNumberChar keyCode of
        Just char ->
          if isDigit char
            then
              { timerEdition | numbers <- char :: timerEdition.numbers }
            else
              timerEdition
        Nothing ->
          timerEdition