{-
    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
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
-}
{-# LANGUAGE FlexibleContexts #-}
module GameState where
import System.Random

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

import Graphics.UI.SDL (Surface)
import Graphics.UI.SDL.Rect
import Graphics.UI.SDL.TTF (Font)

import Surface hiding (isInside)
import qualified Surface (isInside)

import Grid

data PlayerTurn = Player | Ai
    deriving (Eq, Show, Read)

type TileType = Cell

data Stats = Stats {
    playerCount :: Integer,
    aiCount     :: Integer,
    tieCount    :: Integer
} deriving (Eq, Show)

data AppData = AppData {
    --gameState   :: GameState,
    --tiles       :: [Tile],
    grid     :: Grid,
    stats    :: Stats,
    turn     :: PlayerTurn,
    acRand   :: StdGen,
    --gameOver :: Bool,
    winner   :: (Winner, [(Int,Int)])
}

data AppConfig = AppConfig {
    screen      :: Surface,
    font        :: Font,
    oSurface    :: Surface,
    xSurface    :: Surface,
    oWinSurf    :: Surface,
    xWinSurf    :: Surface,
    gridBounds  :: Rect,
    playerStart :: PlayerTurn,
    playerType  :: TileType
}

-- Player Cross
appData :: Int -> PlayerTurn -> AppData
appData seed t = AppData newGrid (Stats 0 0 0) t (mkStdGen seed) (Nobody,[])

getTurn :: MonadState AppData m => m PlayerTurn
getTurn = liftM turn get

putTurn :: MonadState AppData m => PlayerTurn -> m ()
putTurn t = modify $ \s -> s { turn = t }

modifyTurn :: MonadState AppData m => (PlayerTurn -> PlayerTurn) -> m ()
modifyTurn fn = fn `liftM` getTurn >>= putTurn

modifyTurnM :: MonadState AppData m => (PlayerTurn -> m PlayerTurn) -> m ()
modifyTurnM act = getTurn >>= act >>= putTurn

getStats :: MonadState AppData m => m Stats
getStats = liftM stats get

putStats :: MonadState AppData m => Stats -> m ()
putStats t = modify $ \s -> s { stats = t }

modifyStats :: MonadState AppData m => (Stats -> Stats) -> m ()
modifyStats fn = fn `liftM` getStats >>= putStats

modifyStatsM :: MonadState AppData m => (Stats -> m Stats) -> m ()
modifyStatsM act = getStats >>= act >>= putStats

getRGen :: MonadState AppData m => m StdGen
getRGen = liftM acRand get

putRGen :: MonadState AppData m => StdGen -> m ()
putRGen t = modify $ \s -> s { acRand = t }

modifyRGen :: MonadState AppData m => (StdGen -> StdGen) -> m ()
modifyRGen fn = fn `liftM` getRGen >>= putRGen

modifyRGenM :: MonadState AppData m => (StdGen -> m StdGen) -> m ()
modifyRGenM act = getRGen >>= act >>= putRGen

-- utility function to hide plumbing of random generator types.
rand :: MonadState AppData m => Int -> Int -> m Int
rand lo hi = do
    r <- getRGen
    let (val, r') = randomR (lo, hi) r
    putRGen r'
    return val

getGrid :: MonadState AppData m => m Grid
getGrid = liftM grid get

putGrid :: MonadState AppData m => Grid -> m ()
putGrid t = modify $ \s -> s { grid = t }

modifyGrid :: MonadState AppData m => (Grid -> Grid) -> m ()
modifyGrid fn = fn `liftM` getGrid >>= putGrid

modifyGridM :: MonadState AppData m => (Grid -> m Grid) -> m ()
modifyGridM act = getGrid >>= act >>= putGrid

isGameOver :: MonadState AppData m => m Bool
isGameOver = liftM (gameOver . fst . winner) get
 where gameOver Nobody = False
       gameOver _      = True

getWinner :: MonadState AppData m => m (Winner, [(Int,Int)])
getWinner = liftM winner get

putWinner :: MonadState AppData m => (Winner, [(Int,Int)]) -> m ()
putWinner t = modify $ \s -> s { winner = t }

getScreen :: MonadReader AppConfig m => m Surface
getScreen = liftM screen ask

getFont :: MonadReader AppConfig m => m Font
getFont = liftM font ask

getNought :: MonadReader AppConfig m => m Surface
getNought = liftM oSurface ask

getCross :: MonadReader AppConfig m => m Surface
getCross = liftM xSurface ask

getXWinSurf :: MonadReader AppConfig m => m Surface
getXWinSurf = liftM xWinSurf ask

getOWinSurf :: MonadReader AppConfig m => m Surface
getOWinSurf = liftM oWinSurf ask

getPlayerType :: MonadReader AppConfig m => m TileType
getPlayerType = liftM playerType ask

getPlayerStart :: MonadReader AppConfig m => m PlayerTurn
getPlayerStart = liftM playerStart ask

getGridBounds :: MonadReader AppConfig m => m Rect
getGridBounds = liftM gridBounds ask

inGridBounds :: MonadReader AppConfig m => Int -> Int -> m Bool
inGridBounds x y = getGridBounds >>= \r -> return $ Surface.isInside r x y

nextTurn :: MonadState AppData m => m ()
nextTurn = modifyTurn k
 where k Player = Ai
       k Ai = Player

toTileType :: MonadReader AppConfig m => PlayerTurn -> m TileType
toTileType Player = getPlayerType
toTileType Ai = swapCell `liftM` getPlayerType