{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE AllowAmbiguousTypes #-}
module Affection.Subsystems.AffectionWindow where

import Affection.MessageBus
import Affection.Subsystems.Class
import Affection.Types

import Control.Monad.State.Class (get)
import Control.Monad.IO.Class (liftIO)

import qualified SDL

data AffectionWindow msg = AffectionWindow
  { windowChannel :: Channel msg
  }

instance Participant (AffectionWindow (SystemMessage m)) (SystemMessage m) where
  partChannel = windowChannel

  partInit = do
    ad <- get
    nchan <- liftIO $ dupChannel $ messageChannel ad
    return $ AffectionWindow
      { windowChannel = nchan
      }

  partListen p = do
    let chan = partChannel p
    mmsg <- tryPeekChannel chan
    return mmsg

  partEmit p m = do
    let chan = partChannel p
    writeChannel chan m

instance Subsystem (AffectionWindow (SystemMessage m)) (SystemMessage m) where
  consumeEvents aw evs = doConsume evs
    where
      doConsume (e:es) = case SDL.eventPayload e of
        SDL.WindowShownEvent (SDL.WindowShownEventData window) -> do
          partEmit aw (MsgWindowShown (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowHiddenEvent (SDL.WindowHiddenEventData window) -> do
          partEmit aw (MsgWindowHidden (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowExposedEvent (SDL.WindowExposedEventData window) -> do
          partEmit aw (MsgWindowExposed (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowMovedEvent (SDL.WindowMovedEventData window (SDL.P newPos)) -> do
          partEmit aw (MsgWindowMoved (SDL.eventTimestamp e) window newPos)
          doConsume es
        SDL.WindowResizedEvent (SDL.WindowResizedEventData window newSize) -> do
          partEmit aw (MsgWindowResized (SDL.eventTimestamp e) window newSize)
          doConsume es
        SDL.WindowSizeChangedEvent (SDL.WindowSizeChangedEventData window) -> do
          partEmit aw (MsgWindowSizeChanged (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowMinimizedEvent (SDL.WindowMinimizedEventData window) -> do
          partEmit aw (MsgWindowMinimized (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowMaximizedEvent (SDL.WindowMaximizedEventData window) -> do
          partEmit aw (MsgWindowMaximized (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowRestoredEvent (SDL.WindowRestoredEventData window) -> do
          partEmit aw (MsgWindowRestored (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowGainedMouseFocusEvent (SDL.WindowGainedMouseFocusEventData window) -> do
          partEmit aw (MsgWindowGainedMouseFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowLostMouseFocusEvent (SDL.WindowLostMouseFocusEventData window) -> do
          partEmit aw (MsgWindowLostMouseFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowGainedKeyboardFocusEvent (SDL.WindowGainedKeyboardFocusEventData window) -> do
          partEmit aw (MsgWindowGainedKeyboardFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowLostKeyboardFocusEvent (SDL.WindowLostKeyboardFocusEventData window) -> do
          partEmit aw (MsgWindowLostKeyboardFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowClosedEvent (SDL.WindowClosedEventData window) -> do
          partEmit aw (MsgWindowClosed (SDL.eventTimestamp e) window)
          doConsume es
        _ -> fmap (e :) (doConsume es)