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, void)
import Control.Monad.IO.Class (liftIO)

import Data.Matrix (toLists)
import Data.Ecstasy as E

import NanoVG hiding (V2(..))

import Types

import Floorplan

import Linear

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

import Debug.Trace

loadMap :: Affection UserData ()
loadMap = do
  ud <- getAffection
  let fc = FloorConfig (20, 20) [(5,5), (45, 95)] (50,100)
      (Subsystems _ m) = subsystems ud
  matrix <- liftIO $ buildHallFloorIO fc
  (nws, nworld) <- yieldSystemT (worldState ud) $ do
    void $ newEntity $ defEntity
      { pos = Just (V2 20 20)
      , vel = Just (V2 0 0)
      , player = Just True
      }
    getWorld
  uu <- partSubscribe m movePlayer
  putAffection ud
    { world = nworld
    , worldState = nws
    , stateData = MenuData
      { mapMat = matrix
      , initCoords = (0, 500)
      }
    , uuid = [uu]
    }

relativizeMouseCoords :: V2 Int32 -> IO (V2 Double)
relativizeMouseCoords (V2 ix iy) = do
  (GL.Position vx vy, GL.Size vw vh) <- SDL.get GL.viewport
  let rx = ix - vx
      ry = iy - vy
      hx = fromIntegral vw / 2
      hy = fromIntegral vh / 2
      dx = fromIntegral rx - hx
      dy = fromIntegral ry - hy
  return $ V2 (dx / hx) (dy / hy)

mouseToPlayer :: V2 Int32 -> Affection UserData ()
mouseToPlayer mv2 = do
  ud <- getAffection
  rela@(V2 rx ry) <- liftIO $ relativizeMouseCoords mv2
  let dr = ry + rx
      dc = rx - ry / 2
  (nws, nworld) <- yieldSystemT (worldState ud) $ do
    emap $ do
      with player
      pure $ defEntity'
        { vel = Set $ V2 dr dc
        }
    getWorld
  putAffection ud
    { world = nworld
    , 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, nw) <- yieldSystemT (worldState ud) $ do
    emap $ do
      with player
      pure $ defEntity'
        { vel = Set $ V2 0 0
        }
    getWorld
  putAffection ud
    { world = nw
    , worldState = nws
    }
movePlayer _ = return ()

drawMap :: Affection UserData ()
drawMap = do
  ud <- getAffection
  let matrix = mapMat (stateData ud)
  mapM_ (\(i, ls) -> mapM_ (uncurry $ drawTile i) (reverse $ zip [0..] ls))
    (zip [0..] (toLists matrix))

updateMap :: Double -> Affection UserData ()
updateMap _ = do
  ud <- getAffection
  (nws, nw) <- yieldSystemT (worldState ud) $ do
    emap $ do
      with player
      pos' <- E.get pos
      vel' <- E.get vel
      pure $ defEntity'
        { pos = Set $ pos' + vel'
        }
    getWorld
  putAffection ud
    { world = nw
    , worldState = nws
    }

drawTile :: Int -> Int -> TileState -> Affection UserData ()
drawTile row col tile = do
  ud <- getAffection
  (_, playerPos) <- yieldSystemT (worldState ud) $ do
        efor $ \_ -> do
          with player
          pos' <- E.get pos
          pure pos'
  let V2 pr pc = head playerPos
      ctx = nano ud
      (xinit, yinit) = initCoords $ stateData ud
      tileWidth = 20 :: Double
      tileHeight = 10 :: Double
  liftIO $ do
    save ctx
    beginPath ctx
    let x = realToFrac $ 650 + ((fromIntegral col - pc) +
          (fromIntegral row - pr)) * (tileWidth / 2)
        y = realToFrac $ 360 + ((fromIntegral row - pr) -
          (fromIntegral col - pc)) * (tileHeight / 2)
    fillColor ctx (case tile of
      Wall -> rgba 128 128 128 255
      Door -> rgba 255 128 128 255
      Hall -> rgba 255 255 255 255
      Offi -> rgba 0   255 0   255
      Toil -> rgba 0   0   255 255
      Kitc -> rgba 255 0   0   255
      Elev -> rgba 0   0   0   255
      _    -> rgba 255 255 0   255
      )
    moveTo ctx x y
    lineTo ctx (x + realToFrac tileWidth / 2) (y + realToFrac tileHeight / 2)
    lineTo ctx (x + realToFrac tileWidth) y
    lineTo ctx (x + realToFrac tileWidth / 2) (y - realToFrac tileHeight / 2)
    closePath ctx
    fill ctx
    when (floor pr + 1 == row && floor pc + 1 == col) $ do
      beginPath ctx
      circle ctx 640 360 5
      closePath ctx
      fillColor ctx (rgba 0 255 255 255)
      fill ctx
    restore ctx