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 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 NanoVG hiding (V2(..))

import Types

import Floorplan

import Linear

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

import Debug.Trace

-- internal imports

import Interior
import Util

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
  inter <- liftIO $ placeInteriorIO mat (convertTileToImg mat) gr
  (nws, _) <- yieldSystemT (worldState ud) $ do
    void $ newEntity $ defEntity
      { pos = Just (V2 20.5 20.5)
      , vel = Just (V2 0 0)
      , player = Just True
      }
  uu <- partSubscribe m movePlayer
  putAffection ud
    { worldState = nws
    , stateData = MenuData
      { mapMat = mat
      , imgMat = inter
      , initCoords = (0, 500)
      }
    , 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 $ 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) <- yieldSystemT (worldState ud) $ do
        efor $ \_ -> do
          with player
          pos' <- E.get pos
          pure pos'
  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
    beginPath ctx
    moveTo ctx x y
    lineTo ctx
      (x + cols * (realToFrac tileWidth / 2))
      (y - realToFrac tileHeight / 2 * cols)
    lineTo ctx
      (x + realToFrac tileWidth  / 2 * (cols + rows))
      (y + (rows - cols) * (realToFrac tileHeight / 2))
    lineTo ctx
      (x + realToFrac tileWidth / 2 * rows)
      (y + realToFrac tileHeight / 2 * rows)
    closePath ctx
    fillColor ctx (rgb 255 255 255)
    fill ctx
    mapM_ (\(i, ls) -> mapM_
      (\(j, t) -> drawTile
        (assetImages ud) ctx pr pc i j t)
        (reverse $ zip [1..] ls))
      (zip [1..] (toLists mat))
    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
      with vel
      with pos
      pos'@(V2 pr pc) <- E.get pos
      vel' <- E.get vel
      let npos@(V2 nr nc) = pos' + fmap (* (4 * dt)) vel'
          dpos = npos - pos'
          ent = defEntity'
            { pos = Set $ pos' + dpos * Prelude.foldl
              (checkBoundsCollision pos' npos)
              (V2 1 1)
              (
                -- (imgObstacle (imgMat (stateData ud) M.! (floor nr, floor nc))) ++
                -- Prelude.map (\(Boundaries (minr, minc) (maxr, maxc)) ->
                --   let deltar = fromIntegral (floor pr - floor nr)
                --       deltac = fromIntegral (floor pc - floor nc)
                --   in  Boundaries
                --         (minr + deltar, minc + deltac)
                --         (maxr + deltar, maxc + deltac)
                --   )
                concatMap
                (\(dr, dc) ->
                  let bs = imgObstacle
                        (imgMat (stateData ud) M.!
                          (floor (nr + dr), floor (nc + dc)))
                  in  Prelude.map (\(Boundaries (minr, minc) (maxr, maxc))->
                        Boundaries
                          (minr + dr, minc + dc)
                          (maxr + dr, maxc + dc)
                        ) bs
                  )
                ((,) <$> [-1..1] <*> [-1..1])
              )
            }
      return ent
  putAffection ud
    { worldState = nws
    }

drawTile
  :: Map ImgId Image
  -> Context
  -> Double
  -> Double
  -> Int
  -> Int
  -> Maybe ImgId
  -> IO ()
drawTile ai ctx pr pc row col img =
  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)
    y = realToFrac $ 360 - (tileHeight / 2) + ((fromIntegral row - pr) -
      (fromIntegral col - pc)) * (tileHeight / 2)
    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 * fact - realToFrac tileHeight))
        ctx x (y - (74 - realToFrac tileHeight))
        (realToFrac tileWidth) 74
        0
        (ai Map.! fromJust img)
        fact
      -- if fact < 1
      -- then do
      --   moveTo ctx x (y + (realToFrac tileHeight - 74 * fact))
      --   lineTo ctx
      --     (x + realToFrac tileWidth)
      --     (y + (realToFrac tileHeight - 74 * fact))
      --   lineTo ctx (x + realToFrac tileWidth) (y + realToFrac tileHeight / 2)
      --   lineTo ctx (x + realToFrac tileWidth / 2) (y + realToFrac tileHeight)
      --   lineTo ctx x (y + realToFrac tileHeight / 2)
      --   closePath ctx
      -- else
      --   rect ctx x (y - (74 - realToFrac tileHeight)) (realToFrac tileWidth) 74
      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 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 = True
        -- | ncdistsq <= 0.005        = True
        | otherwise                = False
      ntestc
        | ndistc <= hwidth + 0.15  = True
        -- | ncdistsq <= 0.005        = True
        | otherwise                = False
      testr
        | distr <= hheight + 0.15  = True
        -- | cdistsq <= 0.005         = True
        | otherwise                = False
      testc
        | distc <= hwidth + 0.15   = True
        -- | cdistsq <= 0.005         = True
        | otherwise                = False
      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)