module Engine.Sound.Source where

import RIO

import Sound.OpenAL.FFI.AL qualified as AL
import UnliftIO.Resource qualified as Resource
import Foreign qualified

class HasSource a where
  getSource :: a -> AL.Source

instance HasSource AL.Source where
  getSource = id

instance HasSource (a, AL.Source) where
  getSource = snd

allocateCollectionWith
  :: ( Resource.MonadResource m
     , Traversable t
     , HasSource o
     )
  => (i -> m o)
  -> t i
  -> m (Resource.ReleaseKey, t o)
allocateCollectionWith action collection = do
  loaded <- traverse action collection

  key <- Resource.register do
    -- let sources = map getSource $ toList loaded
    -- stop loaded
    -- for_ sources \source ->
    --   OpenAL.buffer source OpenAL.$= Nothing
    -- OpenAL.deleteObjectNames sources
    Foreign.withArrayLen (map getSource $ toList loaded) \num ->
      AL.alDeleteSources (fromIntegral num)

  pure (key, loaded)

{-# INLINE play1 #-}
play1 :: (HasSource a, MonadIO m) => a -> m ()
play1 src = play [src]

{-# INLINE play #-}
play :: (Foldable t, HasSource a, MonadIO m) => t a -> m ()
play (toList -> sources) =
  liftIO $
    Foreign.withArrayLen (map getSource sources) \num ->
      AL.alSourcePlayv (fromIntegral num)

{-# INLINE stop1 #-}
stop1 :: (HasSource a, MonadIO m) => a -> m ()
stop1 src = stop [src]

{-# INLINE stop #-}
stop :: (Foldable t, HasSource a, MonadIO m) => t a -> m ()
stop (toList -> sources) =
  liftIO $
    Foreign.withArrayLen (map getSource sources) \num ->
      AL.alSourceStopv (fromIntegral num)

{-# INLINE toggle #-}
toggle :: (HasSource a, MonadIO m) => Bool -> a -> m ()
toggle active src =
  if active then
    play1 src
  else
    stop1 src