module Game.Utils (rect, isPressed) where

import Foreign.C.Types (CInt)
import qualified SDL
import SDL.Vect (V2 (..))

rect :: Int -> Int -> Int -> Int -> SDL.Rectangle CInt
rect x y w h = SDL.Rectangle (SDL.P $ V2 (fromIntegral x) (fromIntegral y)) (V2 (fromIntegral w) (fromIntegral h))

isPressed :: SDL.Keycode -> [SDL.EventPayload] -> Maybe Bool
isPressed code events
  -- TODO: gamepad support
  | any (isEventKey SDL.Pressed code) events = Just True
  | any (isEventKey SDL.Released code) events = Just False
  | otherwise = Nothing
  where
    isEventKey :: SDL.InputMotion -> SDL.Keycode -> SDL.EventPayload -> Bool
    isEventKey expected keycode (SDL.KeyboardEvent (SDL.KeyboardEventData _ motion False ksym)) = expected == motion && SDL.keysymKeycode ksym == keycode
    isEventKey _ _ _ = False