affection/src/Affection/Util.hs

module Affection.Util
where

import Affection.Types
import Affection.Logging

import qualified SDL

import System.Clock

import Control.Monad.State

-- Prehandle SDL events in case any window events occur
preHandleEvents :: [SDL.Event] -> Affection us [SDL.EventPayload]
preHandleEvents evs =
  return $ map SDL.eventPayload evs

-- | Return the userstate to the user
getAffection :: Affection us us
getAffection = do
  ad <- get
  return $ userState ad

-- | Put altered user state back
putAffection
  :: us              -- User state
  -> Affection us ()
putAffection us = do
  ad <- get
  put $ ad
    { userState = us }

-- | block a thread for a specified amount of time
delaySec
  :: Int -- ^ Number of seconds
  -> IO ()
delaySec dur = SDL.delay (fromIntegral $ dur * 1000)

-- | Get time since start but always the same in the current tick.
getElapsedTime :: Affection us Double
getElapsedTime =
  elapsedTime <$> get

getDelta :: Affection us Double
getDelta =
  deltaTime <$> get

quit :: Affection us ()
quit = do
  ad <- get
  put $ ad { quitEvent = True }

-- | Toggle the Screen mode between 'SDL.Windowed' and 'SDL.FullscreenDesktop'.
-- Pauses the Engine in the process.
toggleScreen :: Affection us ()
toggleScreen = do
  ad <- get
  newMode <- case screenMode ad of
    SDL.Windowed -> do
      SDL.setWindowMode (drawWindow ad) SDL.FullscreenDesktop
      return SDL.FullscreenDesktop
    SDL.FullscreenDesktop -> do
      SDL.setWindowMode (drawWindow ad) SDL.Windowed
      return SDL.Windowed
    x -> do
      liftIO $ logIO Warn ("Unknown Screen mode: " ++ show x)
      return x
  now <- liftIO $ getTime Monotonic
  put ad
    { sysTime = now
    , screenMode = newMode
    }