import qualified Data.Vector as V
-- Simulation simSpace simW simH
-data Simulation = Simulation (V.Vector ChunkData) Int Int deriving (Show)
+data Simulation = Simulation
+ { simSpace :: V.Vector ChunkData
+ , simW :: Int
+ , simH :: Int
+ } deriving (Show)
data ChunkType = Empty
| Water
| Wall deriving (Show)
-data ChunkData = ChunkData ChunkType deriving (Show)
+data ChunkData = ChunkData
+ { chunkType :: ChunkType
+ } deriving (Show)
-- vec accessors
-veccGet v w i = v ! i
-simGet (Simulation s w _) i = veccGet s w i
+simGet Simulation{simSpace=s,simW=w} x y = s ! (y*w+x)
+simSet sim@Simulation{simSpace=s,simW=w,simH=h} c x y = sim { simSpace = (s // [(y*w+x,c)]) }
+
+initSimSpace x y = Simulation
+ { simSpace = V.replicate (y*x) ChunkData { chunkType=Empty }
+ , simW = x
+ , simH = y
+ }
+
+testSim = simSet (initSimSpace 10 10) (ChunkData Water) 5 0
+
+physStep sim@Simulation{simW=w,simH=h} = _physStep [(x, y) | x <- [0..w-1], y <- [0..h-1]] (initSimSpace w h) sim
+_physStep grid acc sim@Simulation{simSpace=s,simW=w,simH=h} =
+ if null grid then acc
+ else _physStep (tail grid) next sim
+ where x = fst $ head grid
+ y = snd $ head grid
+ next = sim
+
+-- takes in list of valid chunks, as well as the sim to modify
+-- updateWaterChunk valid sim =
+
+
+-- gets chunks around a given chunk that are inside grid
+validDirects x y w h = filter
+ (\q -> 0 <= (fst q) && (fst q) < w && (snd q) <= 0 && (snd q) < h)
+ [(a,b) | a <- [x-1..x+1], b <- [y-1..y+1], not (a==x && b==y)]
-veccSet v w c i = v // [(i,c)]
-simSet (Simulation s w h) c i = Simulation (veccSet s w c i) w h
-
-initSimSpace x y = Simulation (V.replicate (y*x) (ChunkData Empty)) x y
-
-testSim = simSet (initSimSpace 10 10) (ChunkData Water) 5
-
-physStep sim@(Simulation _ w h) = _physStep 0 (initSimSpace w h) sim
-_physStep i acc sim@(Simulation s w h) =
- if i >= w*h then acc
- else _physStep (i+1) next sim
- where
- getChunkData (ChunkData c) = c
- next = case getChunkData $ simGet sim i of
- Water -> sim
- _ -> sim
-
--- initGaussSeidel s =
--- where h = length s
--- w = length (s V.! 0)
-
--- gaussSeidel
