module Update.UpdateTimer
  ( TimerAction(..)
  , updateTimer
  ) where

import Time (Time)

import Model.Timer (..)
import Model.TimerState (..)
import Model.Id (..)

type TimerAction =
  Restart
  | Pause
  | ToggleRunning
  | Stop
  | SetTime Time

updateTimer : TimerAction -> Timer -> Timer
updateTimer action timer =
  case action of
    Restart ->
      { timer
      | currentTime <- initTime timer.initialTime
      , state <- Running
      }
    Pause ->
      { timer | state <- Idle }
    ToggleRunning ->
      { timer
      | state <-
          if timer.currentTime > 0 && timer.state == Idle
            then Running
            else Idle
      }
    Stop ->
      { timer
      | currentTime <- initTime timer.initialTime
      , state <- Idle
      }
    SetTime time ->
      let augmentedTime = time + 999
      in  { timer
          | initialTime <- time
          , currentTime <- augmentedTime
          }