HTicTacToe-0.1: GameEnv.hs

{-
    The MIT License
    
    Copyright (c) 2010 Korcan Hussein
    
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
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{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module GameEnv
(
    AppEnv(),
    runApp,
    getPTurnCell,
    modifyPlayerCount,
    screenWidth,
    screenHeight,
    sceenBpp
) where

import Control.Monad.State
import Control.Monad.Reader

import Grid
import GameState

screenWidth, screenHeight, sceenBpp :: Int
screenWidth  = 640
screenHeight = 480
sceenBpp     = 32

type AppState = StateT AppData IO
newtype AppEnv a = AppEnv { runEnv :: ReaderT AppConfig AppState a }
    deriving (Monad, MonadIO, MonadReader AppConfig, MonadState AppData)

runApp :: AppConfig -> AppData -> AppEnv a -> IO (a, AppData)
runApp config state (AppEnv env) = (runStateT . runReaderT env) config state

getPTurnCell :: AppEnv Cell
getPTurnCell = getTurn >>= mapTurn
 where mapTurn :: PlayerTurn -> AppEnv TileType
       mapTurn Player = getPlayerType
       mapTurn Ai = swapCell `liftM` getPlayerType

modifyPlayerCount :: (Integer -> Integer) -> AppEnv ()
modifyPlayerCount fn = liftM mapTurn getTurn >>= modifyStats
 where mapTurn :: PlayerTurn -> Stats -> Stats
       mapTurn Player = \s@Stats { playerCount=pc } -> s { playerCount=fn pc }
       mapTurn Ai     = \s@Stats { aiCount=pc } -> s { aiCount=fn pc }