module Test where

import Affection as A hiding (get)

import SDL (get, ($=))
import qualified SDL
import qualified Graphics.Rendering.OpenGL as GL hiding (get)
import NanoVG hiding (V2(..))

import Control.Monad (when, unless, void)
import Control.Monad.IO.Class (liftIO)
import Control.Concurrent.MVar
import Control.Concurrent (forkIO)

import Data.Map.Strict as Map
import qualified Data.Set as S
import qualified Data.Text as T
import Data.Matrix as M
import Data.Ecstasy as E
import Data.Maybe

import System.Random (randomRIO)

import Linear

import Foreign.C.Types (CFloat(..))

import Debug.Trace

-- internal imports

import Interior
import Util
import Types
import Floorplan
import NPC

loadMap :: Affection UserData ()
loadMap = do
  ud <- getAffection
  let fc = FloorConfig
        (20, 20)
        [(5,5), (35, 35)]
        (50,75)
      (Subsystems _ m) = subsystems ud
  (mat, gr) <- liftIO $ buildHallFloorIO fc
  let imgmat = convertTileToImg mat
      exits = Prelude.foldl
        (\acc coord@(r, c) -> if imgmat M.! coord == Just ImgEmpty
          then ReachPoint RoomExit (V2 r c) : acc
          else acc
          )
        []
        ((,) <$> [1 .. nrows mat] <*> [1 .. ncols mat])
  -- liftIO $ A.logIO A.Debug (show exits)
  (inter, rps) <- liftIO $ placeInteriorIO mat imgmat exits gr
  liftIO $ logIO A.Debug ("number of reachpoints: " ++ show (length rps))
  let nnex = Prelude.filter (\p -> pointType p /= RoomExit) rps
  liftIO $ A.logIO A.Debug $ "number of placed NPCs: " ++ show (length nnex)
  npcposs <- placeNPCs inter mat rps gr (length nnex)
  (nws, _) <- liftIO $ yieldSystemT (worldState ud) $ do
    void $ createEntity $ newEntity
      { pos = Just (V2 20.5 20.5)
      , vel = Just (V2 0 0)
      , player = Just ()
      }
    void $ mapM_ (\npcpos@(V2 nr nc) -> do
      -- ttl <- liftIO $ randomRIO (5, 30)
      fact <- liftIO $ randomRIO (0.5, 1.5)
      future <- liftIO $ newEmptyMVar
      _ <- liftIO $ forkIO $ getPath (fmap floor npcpos) future nnex inter
      createEntity $ newEntity
        { pos      = Just (V2 (nr + 0.5) (nc + 0.5))
        , vel      = Just (V2 0 0)
        , velFact = Just fact
        , npcState = Just (NPCStanding 0 future)
        }
      ) npcposs
  uu <- partSubscribe m movePlayer
  putAffection ud
    { worldState = nws
    , stateData = MenuData
      { mapMat = mat
      , imgMat = M.fromList (nrows inter) (ncols inter) $
        Prelude.map
          (\a -> if a == Just ImgEmpty then Nothing else a)
          (M.toList inter)
      , initCoords = (0, 500)
      , reachPoints = rps
      }
    , uuid = [uu]
    }

mouseToPlayer :: V2 Int32 -> Affection UserData ()
mouseToPlayer mv2 = do
  ud <- getAffection
  (V2 rx ry) <- liftIO $ relativizeMouseCoords mv2
  let dr = (ry / sin (atan (1/2)) / 2) + rx
      dc = rx - (ry / sin (atan (1/2)) / 2)
  (nws, _) <- liftIO $ yieldSystemT (worldState ud) $ do
    emap allEnts $ do
      with player
      pure $ unchanged
        { vel = Set $ 4 * V2 dr dc
        }
  putAffection ud
    { worldState = nws
    }

movePlayer :: MouseMessage -> Affection UserData ()
movePlayer (MsgMouseMotion _ _ _ [SDL.ButtonLeft] m _) = mouseToPlayer m
movePlayer (MsgMouseButton _ _ SDL.Pressed _ SDL.ButtonLeft _ m) =
  mouseToPlayer m
movePlayer (MsgMouseButton _ _ SDL.Released _ SDL.ButtonLeft _ _) = do
  ud <- getAffection
  (nws, _) <- liftIO $ yieldSystemT (worldState ud) $ do
    emap allEnts $ do
      with player
      pure $ unchanged
        { vel = Set $ V2 0 0
        }
  putAffection ud
    { worldState = nws
    }
movePlayer _ = return ()

drawMap :: Affection UserData ()
drawMap = do
  ud <- getAffection
  dt <- getDelta
  (_, (playerPos, npcposs)) <- liftIO $ yieldSystemT (worldState ud) $ do
    pc <- efor allEnts $ do
      with player
      with pos
      pos' <- query pos
      pure pos'
  -- (_, npcposs) <- yieldSystemT (worldState ud) $ do
    npcs <- efor allEnts $ do
      with npcState
      with pos
      pos' <- query pos
      pure pos'
    return (pc, npcs)
  let V2 pr pc = head playerPos
      mat = imgMat (stateData ud)
      ctx = nano ud
      cols = fromIntegral (ncols mat)
      rows = fromIntegral (nrows mat)
      tileWidth = 64 :: Double
      tileHeight = 32 :: Double
      x = realToFrac $ 640 + ((1 - pc) + (1 - pr)) * (tileWidth / 2)
      y = realToFrac $ 360 + ((1 - pr) - (1 - pc)) * (tileHeight / 2)
  liftIO $ do -- draw floor
    beginPath ctx
    moveTo ctx (x + realToFrac tileWidth / 2) y
    lineTo ctx
      (x + cols * (realToFrac tileWidth / 2))
      (y - (realToFrac tileHeight / 2) * (cols - 1))
    lineTo ctx
      (x + (realToFrac tileWidth / 2) * (cols + rows - 1))
      (y + (rows - cols) * (realToFrac tileHeight / 2))
    lineTo ctx
      (x + (realToFrac tileWidth / 2) * rows)
      (y + (realToFrac tileHeight / 2) * (rows - 1))
    closePath ctx
    fillColor ctx (rgb 255 255 255)
    fill ctx
    mapM_ (\(i, ls) -> mapM_
      (\(j, t) -> do
        drawTile
          (assetImages ud) ctx pr pc i j t
        drawNPCs ctx ud npcposs pr pc i j t
        )
        (reverse $ zip [1..] ls))
      (zip [1..] (toLists mat))
  -- liftIO $ do -- draw FPS
    fontSize ctx 20
    fontFace ctx (assetFonts ud Map.! FontBedstead)
    textAlign ctx (S.fromList [AlignCenter,AlignTop])
    fillColor ctx (rgb 255 128 0)
    textBox ctx 0 0 200 ("FPS: " `T.append` (T.pack $ Prelude.take 5 $ show (1/dt)))

updateMap :: Double -> Affection UserData ()
updateMap dt = do
  ud <- getAffection
  (nws, _) <- liftIO $ yieldSystemT (worldState ud) $ do
    emap allEnts $ do
      without player
      with vel
      with velFact
      with pos
      pos'@(V2 pr pc) <- query pos
      vel' <- query vel
      fact' <- query velFact
      let npos@(V2 nr nc) = pos' + fmap (* (dt * fact')) vel'
          dpos = npos - pos'
          ent = unchanged
            { pos = Set $ npos
            }
      return ent
    emap allEnts $ do
      with player
      with vel
      with pos
      pos'@(V2 pr pc) <- query pos
      vel' <- query vel
      let npos@(V2 nr nc) = pos' + fmap (* dt) vel'
          dpos@(V2 dpr dpc) = npos - pos'
          len = sqrt (dpos `dot` dpos)
          lll = (,)
            <$> (
              if dpr < 0
              then [(floor dpr :: Int) .. 0]
              else [0 .. (ceiling dpr :: Int)])
            <*> (
              if dpc < 0
              then [(floor dpc :: Int) .. 0]
              else [0 .. (ceiling dpc :: Int)])
          -- lll = Prelude.map (\i ->
          --         let lrow =
          --               [ (nr - (fromIntegral $ floor nr))
          --               , (nr - (fromIntegral $ floor nr)) + (dpr / len)
          --               ..
          --               ]
          --             lcol =
          --               [ (nc - (fromIntegral $ floor nc))
          --               , (nc - (fromIntegral $ floor nc)) + (dpc / len)
          --               ..
          --               ]
          --         in  (fromIntegral (floor (lrow !! i)), fromIntegral (floor (lcol !! i)))
          --         )
          --         [ 0 .. floor len]
          ent = unchanged
            { pos = Set $ pos' + dpos * Prelude.foldl
              (\acc a -> let ret = checkBoundsCollision2 pos' npos dt acc a
                in A.log A.Verbose (show ret) ret)
              (V2 1 1)
              (
                concatMap
                (\(dr, dc) ->
                  let bs = fromMaybe [] (imgObstacle <$> (M.safeGet
                        (fromIntegral $ floor pr + dr)
                        (fromIntegral $ floor pc + dc)
                        (imgMat (stateData ud))))
                  in  Prelude.map (\(Boundaries (minr, minc) (maxr, maxc))->
                        Boundaries
                          (minr + fromIntegral dr, minc + fromIntegral dc)
                          (maxr + fromIntegral dr, maxc + fromIntegral dc)
                        ) bs
                  )
                (A.log A.Verbose (show lll ++ " " ++ show len) lll)
              )
            }
      return ent
    updateNPCs
      (imgMat $ stateData ud)
      (Prelude.filter
        (\p -> pointType p /= RoomExit)
        (reachPoints $ stateData ud)
        )
      dt
  putAffection ud
    { worldState = nws
    }

drawTile
  :: Map ImgId Image
  -> Context
  -> Double
  -> Double
  -> Int
  -> Int
  -> Maybe ImgId
  -> IO ()
drawTile ai ctx pr pc row col img =
  when ((realToFrac x > -tileWidth && realToFrac y > -tileHeight) &&
    (realToFrac x < 1280 && realToFrac (y - (74 - realToFrac tileHeight)) < 720)) $
      do
        save ctx
        if (isNothing img)
        then drawPlayer
        else do
          if (Prelude.null mb)
          then do
            drawImage
            drawPlayer
          else do
            if (all (\m -> pr > (fromIntegral (floor pr :: Int)) + m) minrs &&
               all (\m -> pc < (fromIntegral (floor pc :: Int)) + m) mincs) ||
               (all (\m -> pr > (fromIntegral (floor pr :: Int)) + m) minrs &&
               all (\m -> pc < (fromIntegral (floor pc :: Int)) + m) maxcs)
            then do
              drawImage
              drawPlayer
            else do
              drawPlayer
              drawImage
        restore ctx
  where
    tileWidth = 64 :: Double
    tileHeight = 32 :: Double
    minrs = Prelude.map (fst . matmin) mb
    maxrs = Prelude.map (fst . matmax) mb
    mincs = Prelude.map (snd . matmin) mb
    maxcs = Prelude.map (snd . matmax) mb
    x = realToFrac $ 640 + ((fromIntegral col - pc) +
      (fromIntegral row - pr)) * (tileWidth / 2) :: CFloat
    y = realToFrac $ 360 - (tileHeight / 2) + ((fromIntegral row - pr) -
      (fromIntegral col - pc)) * (tileHeight / 2) :: CFloat
    dist = distance (V2 (fromIntegral row) (fromIntegral col))
      (V2 (realToFrac pr - 1) (realToFrac pc)) / 4
    fact =
      if (pr <= fromIntegral row + minimum maxrs &&
         pc >= fromIntegral col + maximum mincs) &&
         isWall (fromJust img)
      then min 1 dist
      else 1
    mb = imgObstacle img
    drawImage = do
      beginPath ctx
      paint <- imagePattern
        ctx x (y - (74 - realToFrac tileHeight))
        (realToFrac tileWidth) 74
        0
        (ai Map.! fromJust img)
        fact
      rect ctx x (y - (74 - realToFrac tileHeight)) (realToFrac tileWidth) 74
      fillPaint ctx paint
      fill ctx
    drawPlayer = do
      when (floor pr == row && floor pc == col) $ do
        beginPath ctx
        circle ctx 640 360 5
        closePath ctx
        fillColor ctx (rgba 0 255 255 255)
        fill ctx

checkBoundsCollision
  :: V2 Double
  -> V2 Double
  -> V2 Double
  -> Boundaries Double
  -> V2 Double
checkBoundsCollision
  (V2 pr pc) (V2 fr fc) (V2 mr mc) (Boundaries (minr, minc) (maxr, maxc))
    | ntestc && ntestr && not testr && not testc = V2 (1 * mr) (1 * mc)
    | ntestc && ntestr && not testc              = V2 (1 * mr) (0 * mc)
    | ntestr && ntestc && not testr              = V2 (0 * mr) (1 * mc)
    | not ntestr && not ntestc                   = V2 (1 * mr) (1 * mc)
    | not ntestr && ntestc                       = V2 (1 * mr) (1 * mc)
    | not ntestc && ntestr                       = V2 (1 * mr) (1 * mc)
    | otherwise                                  = V2 (0 * mr) (0 * mc)
    where
      ntestr
        = ndistr <= hheight + 0.15
        -- | ncdistsq <= 0.005        = True
      ntestc
        = ndistc <= hwidth + 0.15
        -- | ncdistsq <= 0.005        = True
      testr
        = distr <= hheight + 0.15
        -- | cdistsq <= 0.005         = True
      testc
        = distc <= hwidth + 0.15
        -- | cdistsq <= 0.005         = True
      ndistr = abs (fr - (fromIntegral (floor fr :: Int) + (minr + hheight)))
      ndistc = abs (fc - (fromIntegral (floor fc :: Int) + (minc + hwidth)))
      distr  = abs (pr - (fromIntegral (floor fr :: Int) + (minr + hheight)))
      distc  = abs (pc - (fromIntegral (floor fc :: Int) + (minc + hwidth)))
      hheight = (maxr - minr) / 2
      hwidth = (maxc - minc) / 2
      ncdistsq = (ndistr - hheight) ^ (2 :: Int) + (ndistc - hwidth) ^ (2 :: Int)
      cdistsq = (distr - hheight) ^ (2 :: Int) + (distc - hwidth) ^ (2 :: Int)

checkBoundsCollision2
  :: V2 Double
  -> V2 Double
  -> Double
  -> V2 Double
  -> Boundaries Double
  -> V2 Double
checkBoundsCollision2
  pre@(V2 pr pc) next@(V2 nr nc) dt acc (Boundaries (minr, minc) (maxr, maxc))
    | colltr < dt && colltc < dt = V2 0 0
    | colltr < dt && incol       = V2 0 1 * acc
    | colltc < dt && inrow       = V2 1 0 * acc
    | otherwise                  = acc
    where
      vel@(V2 vr vc) = fmap (/ dt) (next - pre)
      colltr
        | vr > 0 && prr <= maxr =
          (((fromIntegral (floor pr :: Int)) + minr - 0.15) - pr) / vr
        | vr < 0 && prr >= minr =
          (((fromIntegral (floor pr :: Int)) + maxr + 0.15) - pr) / vr
        | otherwise = dt
      colltc
        | vc > 0 && prc <= maxc =
          (((fromIntegral (floor pc :: Int)) + minc - 0.15) - pc) / vc
        | vc < 0 && prc >= minc =
          (((fromIntegral (floor pc :: Int)) + maxc + 0.15) - pc) / vc
        | otherwise = dt
      inrow = pr > minr && pr < maxr
      incol = pc > minc && pc < maxc
      prr = pr - (fromIntegral $ floor pr)
      prc = pc - (fromIntegral $ floor pc)