--{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE Strict #-}
module Picture
    ( module Picture.Data
    , polygon
    , arc
    , arcSolid
    , thickArc
    , thickCircle
    , circleSolid
    , circle
    , line
    , text
    , pictures
    , translate
    , rotate
    , rotateRad
    , scale
    , blank
    , color
    , withAlpha
    , greyN
    , red       
    , green     
    , blue      
    , yellow    
    , cyan      
    , magenta   
    , rose      
    , violet    
    , azure     
    , aquamarine
    , chartreuse
    , orange    
    , white     
    , black
    , dim
    , light
    , dark
    , bright
    , mixColors
    , zeroZ
    , setDepth
    )
    where
import Geometry
import Geometry.Data

import Picture.Data

import Data.Bifunctor
import qualified Data.DList as DL

import Graphics.Rendering.OpenGL (lineWidth, ($=),PrimitiveMode (..))

import Control.Lens

black :: RGBA
black = (0,0,0,1)

polygonD :: Float -> [Point2] -> Picture
{-# INLINE polygonD #-}
polygonD d (a:b:c:ps) = blank
    { _scPosTri = DL.fromList $ map (\(x,y) -> (x,y,d)) tris
    , _scColTri = DL.fromList $ map (const black) tris
    }
    where twoPs = zip (b:c:ps) (c:ps)
          tris = concatMap (\(x,y)-> [a,x,y]) twoPs
polygonD _ _ = blank

polygon :: [Point2] -> Picture
{-# INLINE polygon #-}
polygon (a:b:c:ps) = blank
    { _scPosTri = DL.fromList $ map zeroZ tris
    , _scColTri = DL.fromList $ map (const black) tris
    }
    where twoPs = zip (b:c:ps) (c:ps)
          tris = concatMap (\(x,y)-> [a,x,y]) twoPs
polygon _ = blank

color :: RGBA -> Picture -> Picture
{-# INLINE color #-}
color c = over scColTri (DL.map $ const c) . over scColChar (DL.map $ const c)

translate3 :: Float -> Float -> Point3 -> Point3
{-# INLINE translate3 #-}
translate3 a b (x,y,z) = (x+a,y+b,z)

translate :: Float -> Float -> Picture -> Picture
{-# INLINE translate #-}
translate x y = over scPosTri (DL.map $ translate3 x y) . over scPosChar (DL.map $ translate3 x y)

setDepth :: Float -> Picture -> Picture
setDepth d = over scPosTri (DL.map $ (\(x,y,z)->(x,y,d)))
             . over scPosChar (DL.map $ (\(x,y,z)->(x,y,d)))

--overVs' :: (CPoint2 -> CPoint) -> Picture -> Picture
----{-# INLINE overVs' #-}
--overVs' f !(Scene a b) = let !a' = map f a
--                             !b' = map g b
--                         in  Scene a' b'
--    where g !(x,y,z) = let !(x',y') = f (x,y)
--                       in  (x',y',z)

scale3 :: Float -> Float -> Point3 -> Point3
{-# INLINE scale3 #-}
scale3 a b (x,y,z) = (x*a,y*b,z)

scale :: Float -> Float -> Picture -> Picture
{-# INLINE scale #-}
scale x y = over scPosTri (DL.map $ scale3 x y) . over scPosChar (DL.map $ scale3 x y)

rotate3 :: Float -> Point3 -> Point3
{-# INLINE rotate3 #-}
rotate3 a (x,y,z) = (x',y',z)
    where (x',y') = rotateV a (x,y)

rotate :: Float -> Picture -> Picture
{-# INLINE rotate #-}
rotate a = over scPosTri (DL.map $ rotate3 (0 - degToRad a)) 
            . over scPosChar (DL.map $ rotate3 (0 - degToRad a))

--  -- this rotation uses radians, and is anticlockwise
rotateRad :: Float -> Picture -> Picture
{-# INLINE rotateRad #-}
rotateRad a = over scPosTri (DL.map $ rotate3 a) 
            . over scPosChar (DL.map $ rotate3 a)

pictures :: [Picture] -> Picture
{-# INLINE pictures #-}
pictures = mconcat


makeArc :: Float -> (Float,Float) -> [Point2]
{-# INLINE makeArc #-}
makeArc rad (a,b) = zipWith rotateV as $ repeat (0,rad)
    where as = [a,a+step.. b]
          step = pi * 0.1

circleSolidD :: Float -> Float -> Picture
circleSolidD d r = polygonD d $ makeArc r (0,2*pi)

circleSolid :: Float -> Picture
{-# INLINE circleSolid #-}
circleSolid rad = polygon $ makeArc rad (0,2*pi)

circle :: Float -> Picture
{-# INLINE circle #-}
circle rad = line $ makeArc rad (0,2*pi)

--text :: String -> Picture
--text s = zipWith (\x -> overVs $ first $ translate3 x 0) 
--                 [0,0.25..]
--                 $ map charToShape s

text :: String -> Picture
{-# INLINE text #-}
text s = mconcat $ zipWith (\x -> translate x (0-dimText)) 
                           [0,0.9*dimText..] 
                           (map charToScene s)

charToScene :: Char -> Picture
charToScene c = Scene
    {_scPosTri = DL.empty
    ,_scColTri = DL.empty
    ,_scPosChar = DL.fromList [(0.0    ,0.0      ,0)        
                  ,(dimText,0.0      ,0)    
                  ,(dimText,dimText*2,0)
                  ,(0.0    ,0.0      ,0)        
                  ,(dimText,dimText*2,0)
                  ,(0.0    ,dimText*2,0)    
                  ]
    ,_scColChar = DL.fromList $ take 6 $ repeat white
    ,_scTexChar = DL.fromList $ [(s,1) ,(e,1) ,(e,0) ,(s,1) ,(e,0) ,(s,0)]
    }
    where x = 1/128
          s = offset * x
          e = s + x
          offset = fromIntegral (fromEnum c) - 32
    

dimText = 100

line :: [Point2] -> Picture
{-# INLINE line #-}
line ps = thickLine ps 1

thickLine :: [Point2] -> Float -> Picture
{-# INLINE thickLine #-}
thickLine ps x = blank

thickCircle :: Float -> Float -> Picture
{-# INLINE thickCircle #-}
thickCircle rad wdth = thickLine (makeArc rad (0,2*pi)) wdth

arcSolid :: Float -> Float -> Float -> Picture
{-# INLINE arcSolid #-}
arcSolid startA endA rad
    = polygon $ (0,0) : makeArc rad (startA,endA)

arc startA endA rad = thickArc startA endA rad 1
{-# INLINE arc #-}

thickArc :: Float -> Float -> Float -> Float -> Picture
{-# INLINE thickArc #-}
thickArc startA endA rad wdth
    = thickLine (makeArc rad (startA,endA)) wdth

withAlpha :: Float -> RGBA -> RGBA
{-# INLINE withAlpha #-}
withAlpha a (x,y,z,a') = (x,y,z,a*a')

red,green,blue,yellow,cyan,magenta,rose,violet,azure,aquamarine,chartreuse,orange,white::Color
red       = (1,0,0,1) 
green     = (0,1,0,1) 
blue      = (0,0,1,1) 
yellow    = (1,1,0,1)  
cyan      = (0,1,1,1) 
magenta   = (1,0,1,1)  
rose      = (1,0,0.5,1) 
violet    = (0.5,0,1,1)  
azure     = (0,0.5,1,1) 
aquamarine= (0,1,0.5,1) 
chartreuse= (0.5,1,0,1)
orange    = (1,0.5,0,1)  
white     = (1,1,1,1) 

mixColors :: Float -> Float -> Color -> Color -> Color
mixColors rata ratb (r0,g0,b0,a0) (r2,g2,b2,a2) = 
    let fullrat = rata + ratb
        normrata = rata / fullrat
        normratb = ratb / fullrat
        f x y = sqrt $ normrata * x^2 + normratb * y^2
    in  (f r0 r2 , f g0 g2 , f b0 b2 , normrata * a0 + normratb * a2)

light :: Color -> Color
light (r,g,b,a) = (r+0.2,g+0.2,b+0.2,a)

dark :: Color -> Color
dark (r,g,b,a) = (r-0.2,g-0.2,b-0.2,a)
        
dim :: Color -> Color
dim (r,g,b,a) = (r/1.2,g/1.2,b/1.2,a)

bright :: Color -> Color
bright (r,g,b,a) = (r*1.2,g*1.2,b*1.2,a)

greyN :: Float -> Color
greyN x = (x,x,x,1)