{-#LANGUAGE ScopedTypeVariables, FlexibleInstances, FlexibleContexts,
   UndecidableInstances, TypeSynonymInstances, OverlappingInstances,
   TypeOperators#-}

module Graphics.Tools.CV2WX (
  WxImage(..), WxPaintable(..)
) where

import Graphics.UI.WXCore.Types
import Graphics.UI.WXCore.Image
import Graphics.UI.WX
import Graphics.Tools.WX
import Graphics.Tools.Bindings.Convert
import CV.Image
import CV.Operations hiding (set)
import CV.Corners
import CV.HoughTransform hiding (start, Line)
import qualified CV.HoughTransform as HT
import CV.DFT
import Data.List(genericLength)

instance WxImage (Image GrayScale D8) where
  toImage i = cvToWx i c'cpy_ipl_d8_gray_to_d8_rgb
  toSize i = do return $ sz w h
    where (w,h) = getSize i

instance WxImage (Image GrayScale D32) where
  toImage i = cvToWx (unitNormalize i) c'cpy_ipl_f32_gray_to_d8_rgb
  toSize i = do return $ sz w h
    where (w,h) = getSize i

instance WxImage (Image DFT D32) where
  toImage i = cvToWx (logNormalize mag) c'cpy_ipl_f32_gray_to_d8_rgb
    where
      (mag,ang) = dftToPolar i
  toSize i = do return $ sz w h
    where
      (w,h) = getSize i

instance WxImage (Image RGB D8) where
  toImage i = cvToWx i c'cpy_ipl_d8_rgb_to_d8_rgb
  toSize i = do return $ sz w h
    where (w,h) = getSize i

instance WxImage (Image RGB D32) where
  toImage i = cvToWx i c'cpy_ipl_f32_rgb_to_d8_rgb
  toSize i = do return $ sz w h
    where (w,h) = getSize i

cvToWx img cpy = do
    pb <- pixelBufferCreate (sz w h)
    i <- imageCreateFromPixelBuffer pb
    withImage img $ \cimg -> do
      withImageData i $ cpy cimg
    return i
  where
    (w,h) = getSize img

instance (WxImage (Image c d)) => WxPaintable (Image c d) where
  doPaint dc p i = do
    img <- toImage $ i
    drawImage dc img p []
  paintSize i = sz w h
    where (w,h) = getSize i

instance (WxPaintable a, WxPaintable b) => WxPaintable (a, b) where
  doPaint dc p (p1,p2) = do
    doPaint dc p p1
    doPaint dc np p2
    where
      (Size w _) = paintSize p1
      np = (pointAdd p (point w 0))
  paintSize (i1,i2) =
    sz (w1+w2) (max h1 h2)
    where
      (Size w1 h1) = paintSize i1
      (Size w2 h2) = paintSize i2

instance (WxPaintable a, WxPaintable b, WxPaintable c) => WxPaintable (a,b,c) where
  doPaint dc p (p1,p2,p3) = do
    doPaint dc p p1
    doPaint dc np1 p2
    doPaint dc np2 p3
    where
      (Size w1 _) = paintSize p1
      (Size w2 _) = paintSize p2
      np1 = (pointAdd p (point w1 0))
      np2 = (pointAdd np1 (point w2 0))
  paintSize (i1,i2,i3) =
    sz (w1+w2+w3) (maximum [h1,h2,h3])
    where
      (Size w1 h1) = paintSize i1
      (Size w2 h2) = paintSize i2
      (Size w3 h3) = paintSize i3

instance WxPaintable [PaintableBox] where
  doPaint dc p [] = return ()
  doPaint dc p (b:bs) = do
    doPaint dc p b
    doPaint dc np bs
    where
      (Size _ h) = paintSize b
      np = pointAdd p (point 0 h)
  paintSize bs =
    sz (maximum $ map (sizeW . paintSize) bs)  (sum $ map (sizeH . paintSize) bs)

-- starting point
-- area width
-- area height
-- points
listToPoints :: Point -> Int -> Int -> [Float] -> [Point]
listToPoints (Point x y) w h ps =
  [ Point (x + (round i)) (y - (round j)) | (i,j) <- zip (map (* inc) [0..genericLength ps - 1]) (map (* scale) ps) ]
  where
        inc :: Float = (fromIntegral w) / (fromIntegral (length ps))
        scale :: Float = (fromIntegral h) / (maximum ps)

instance (WxPaintable (Image c d)) => WxPaintable ((Image c d), [Float]) where
  doPaint dc p@(Point x y) (i,hs) = do
    doPaint dc p i
    set dc [penColor := red, brushColor := yellow, brushKind := BrushSolid]
    polygon dc (listToPoints hp hw hh (concat [[0],hs,[0]])) []
    where
      (Size w h) = paintSize i
      hw = round $ (fromIntegral w) * 0.9
      dx = round $ (fromIntegral (w - hw)) / 2
      hh = round $ (fromIntegral h) * 0.3
      dy = 5
      hx = (x + dx)
      hy = (y + h - dy)
      hp = (Point hx hy)
  paintSize (i,h) = paintSize i

instance (WxPaintable (Image c d)) => WxPaintable ((Image c d), (Float,Float), [Float]) where
  doPaint dc p@(Point x y) (i,(a,s),hs) = do
    doPaint dc p i
    set dc [penColor := red, brushColor := yellow, brushKind := BrushSolid]
    polygon dc (listToPoints hp hw hh (concat [[0],hs,[0]])) []
    line dc (point ax (hy + ds)) (point ax (hy - hh - ds)) []
    line dc (point sx (hy + ds)) (point (sx + sw) (hy + ds)) []
    where
      (Size w h) = paintSize i
      hw = round $ (fromIntegral w) * 0.9
      dx = round $ (fromIntegral (w - hw)) / 2
      hh = round $ (fromIntegral h) * 0.3
      dy = 5
      hx = (x + dx)
      hy = (y + h - dy)
      hp = (Point hx hy)
      ax = hx + (round $ a * (fromIntegral hw))
      sx = ax - (round $ s * (fromIntegral hw))
      sw = round $ 2 * s * (fromIntegral hw)
      ds = 3
  paintSize (i,s,h) = paintSize i

instance WxColor HarrisDesc where
  toColor d = colorRGB i i i
    where i = round $ 255 * d

instance WxColor HoughDesc where
  toColor d = red

instance (WxColor a) => WxPaintable (Corner a) where
  doPaint dc p (Corner (x,y) d) = do
    set dc [penColor := black, brushColor := toColor d]
    drawRect dc (rect (point (x-5) (y-5)) (sz 10 10)) []

instance WxPaintable HT.Segment where
  doPaint dc p (HT.Segment (x1,y1) (x2,y2)) = do
    set dc [penColor := red]
    circle dc (point x1 y1) 5 []
    circle dc (point x2 y2) 5 []
    line dc (point x1 y1) (point x2 y2) []

instance (WxColor a) => WxPaintable (ImageWithCorners a) where
  doPaint dc p (ImageWithCorners i c) = do
    doPaint dc p i
    mapM_ (doPaint dc p) $ c
  paintSize (ImageWithCorners i _) = sz w h
    where (w,h) = getSize i

instance (WxPaintable a, WxPaintable b) => WxPaintable (a `With` b) where
  doPaint dc p (i `With` c) = do
    doPaint dc p i
    doPaint dc p $ c
  paintSize (i `With` _) = paintSize i


instance WxPaintable (HT.ImageWithLines) where
  doPaint dc p (i `With` l) = do
    doPaint dc p i
    mapM_ (doPaint dc p) $ map (HT.lineToSegment (getSize i)) l
  paintSize (i `With` l) = sz w h
    where (w,h) = getSize i

instance WxPaintable (HT.ImageWithSegments) where
  doPaint dc p (i `With` l) = do
    doPaint dc p i
    mapM_ (doPaint dc p) $ l
  paintSize (i `With` l) = sz w h
    where (w,h) = getSize i