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 (fromJust)

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
  (matrix, gr) <- liftIO $ buildHallFloorIO fc
  inter <- liftIO $ placeInteriorIO matrix (convertTileToImg matrix) 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 = matrix
      , imgMat = inter
      , initCoords = (0, 500)
      }
    , uuid = [uu]
    }

mouseToPlayer :: V2 Int32 -> Affection UserData ()
mouseToPlayer mv2 = do
  ud <- getAffection
  rela@(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
      pos' <- E.get pos
      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 _ m) = 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
      matrix = imgMat (stateData ud)
      ctx = nano ud
      cols = fromIntegral (ncols matrix)
      rows = fromIntegral (nrows matrix)
      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 matrix))
    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
  let matrix = mapMat $ stateData ud
  (nws, _) <- yieldSystemT (worldState ud) $ do
    emap $ do
      with vel
      with pos
      pos'@(V2 or oc) <- E.get pos
      vel' <- E.get vel
      let npos@(V2 nr nc) = pos' + fmap (* (4 * dt)) vel'
      let ent
            | Wall /= matrix M.! (floor nr, floor nc) =
              defEntity'
                { pos = Set npos
                }
            | Wall /= matrix M.! (floor nr, floor oc) =
              defEntity'
                { pos = Set (V2 nr oc)
                }
            | Wall /= matrix M.! (floor or, floor nc) =
              defEntity'
                { pos = Set (V2 or nc)
                }
            | otherwise =
              defEntity'
      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
  let tileWidth = 64 :: Double
      tileHeight = 32 :: Double
  save ctx
  let x = realToFrac $ 640 + ((fromIntegral col - pc) +
        (fromIntegral row - pr)) * (tileWidth / 2)
      y = realToFrac $ 360 - (tileHeight / 2) + ((fromIntegral row - pr) -
        (fromIntegral col - pc)) * (tileHeight / 2)
  unless (img == Nothing) $ do
    let dist = distance (V2 (fromIntegral row) (fromIntegral col))
          (V2 (realToFrac pr - 0.5) (realToFrac pc + 0.5)) / 4
        fact = if (floor pr <= row && floor pc >= col) && isWall (fromJust img)
          then min 1 dist
          else 1
    paint <- imagePattern
      ctx x (y - (74 * fact - realToFrac tileHeight))
      (realToFrac tileWidth) 74
      0
      (ai Map.! fromJust img)
      fact
    beginPath ctx
    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
    fillPaint ctx paint
    fill ctx
  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
  restore ctx