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 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 = length (Prelude.filter (\p -> pointType p /= RoomExit) rps)
  liftIO $ A.logIO A.Debug $ "number of placed NPCs: " ++ show nnex
  npcposs <- placeNPCs inter mat rps gr nnex
  (nws, _) <- yieldSystemT (worldState ud) $ do
    void $ newEntity $ defEntity
      { pos = Just (V2 20.5 20.5)
      , vel = Just (V2 0 0)
      , player = Just ()
      }
    void $ mapM_ (\(V2 nr nc) -> do
      -- ttl <- liftIO $ randomRIO (5, 30)
      fact <- liftIO $ randomRIO (0.5, 1.5)
      newEntity $ defEntity
        { pos      = Just (V2 (nr + 0.5) (nc + 0.5))
        , vel      = Just (V2 0 0)
        , velFact = Just fact
        , npcState = Just (NPCStanding 0)
        }
      ) 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, _) <- yieldSystemT (worldState ud) $ do
    emap $ do
      with player
      pure $ defEntity'
        { 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, _) <- yieldSystemT (worldState ud) $ do
    emap $ do
      with player
      pure $ defEntity'
        { vel = Set $ V2 0 0
        }
  putAffection ud
    { worldState = nws
    }
movePlayer _ = return ()

drawMap :: Affection UserData ()
drawMap = do
  ud <- getAffection
  dt <- getDelta
  (_, (playerPos, npcposs)) <- yieldSystemT (worldState ud) $ do
    pc <- efor $ \_ -> do
      with player
      with pos
      pos' <- E.get pos
      pure pos'
  -- (_, npcposs) <- yieldSystemT (worldState ud) $ do
    npcs <- efor $ \_ -> do
      with npcState
      with pos
      pos' <- E.get 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
      liftIO $ drawTile
        (assetImages ud) ctx pr pc i j t
      drawNPCs ctx 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, _) <- yieldSystemT (worldState ud) $ do
    emap $ do
      without player
      with vel
      with velFact
      with pos
      pos'@(V2 pr pc) <- E.get pos
      vel' <- E.get vel
      fact' <- E.get velFact
      let npos@(V2 nr nc) = pos' + fmap (* (dt * fact')) vel'
          dpos = npos - pos'
          ent = defEntity'
            { pos = Set $ npos
            }
      return ent
    emap $ do
      with player
      with vel
      with pos
      pos'@(V2 pr pc) <- E.get pos
      vel' <- E.get 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 = defEntity'
            { 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)