{-# LANGUAGE ForeignFunctionInterface #-}

module Init where

import Affection as A

import SDL (($=))
import qualified SDL

import qualified Graphics.Rendering.OpenGL as GL

import NanoVG hiding (V2(..), V3(..))

import Linear

import Control.Monad (when)
import Control.Monad.IO.Class (liftIO)

import Control.Concurrent.STM

import qualified Data.Set as S
import qualified Data.Map.Strict as M
import Data.Ecstasy
import Data.Maybe

import System.Exit (exitFailure)

import Foreign.C.Types (CInt(..))

import Types

import Floorplan

import Debug.Trace

foreign import ccall unsafe "glewInit"
  glewInit :: IO CInt

load :: IO UserData
load = do
  _ <- glewInit
  nvg <- createGL3 (S.fromList [StencilStrokes])
  subs <- Subsystems
    <$> (Window <$> newTVarIO [])
    <*> (Mouse <$> newTVarIO [])
  (ws, _) <- yieldSystemT (0, defWorld) (return ())
  mwall <- createImage nvg (FileName "assets/walls/wall_desc.png") 0
  when (isNothing mwall) $ do
    logIO Error "Failed to load wall"
    exitFailure
  return UserData
    { state       = Menu
    , subsystems  = subs
    , assetImages = M.fromList
      [ (ImgWall, fromJust mwall)
      ]
    , nano        = nvg
    , uuid        = []
    , worldState  = ws
    , stateData   = None
    }