{-# language TypeFamilies, DeriveFunctor #-}
module Graphics.Rendering.Plot.Light.Internal.Layout where

import qualified Data.IntMap as IM

import Graphics.Rendering.Plot.Light.Internal.Geometry
import Graphics.Rendering.Plot.Light.Internal

import qualified Data.Colour as C
import qualified Data.Text as T


{- |

YADG : Yet another DSL for graphics

Design :

* add dataset to Plot
* add Plot to WindowState (e.g. side by side plots, inset ... by specifying a RelativeFrame for it)
* compute all viewpanes (i.e. `to` frames)
* compute data transformations from viewpanes

-}

data PlotType = HeatMap | Scatter | TimeSeries 




-- | A `RelativeFrame` is given by two set of parameters:
--
-- 0 <= `rfX`, `rfY` <= 1 : normalized coordinates of the anchor point (top-left corner)
-- 0 <= `rfHeight`, `rfWidth` <= 1 : normalized width and height 
data RelativeFrame a = RelFrame
  { rfX :: a
  , rfY :: a
  , rfWidth :: a
  , rfHeight :: a
  } deriving (Eq, Show)

mkRelativeFrame :: (Ord a, Num a) => a -> a -> a -> a -> RelativeFrame a
mkRelativeFrame x y w h
  | all bounded01 [x,y,w,h] = RelFrame x y w h
  | otherwise = RelFrame 0 0 1 1

bounded01 :: (Ord a, Num a) => a -> Bool
bounded01 x = 0 <= x && x <= 1
    

-- data PlotAxis a = PlotAxis
--   { axType :: Axis
--   , axColour :: C.Colour Double
--   , axLabelFontSize :: Int
--   , axRangeMin :: a
--   , axRangeMax :: a
--   , axNTicks :: Int
--   , axTicks :: a -> T.Text  -- `a` is position parameter `0 <= lambda <= 1`
--   }

-- data Plot c a = Plot
--    { plRelativeFrame :: RelativeFrame a
--    , plAxisX :: PlotAxis a
--    , plAxisY :: PlotAxis a
--    , plContents :: c
--    }







-- data Window c a = W
--   { wWidth :: a
--   , wHeight :: a
--   , wState :: IM.IntMap (IM.IntMap (Plot c a))
--   }

-- data Layout c a s =
--   AddPlot (Window c a) (RelativeFrame a) (Window c a -> s)
--   deriving Functor




-- addPlot
--   :: Window c a -> RelativeFrame a -> Free (Layout c a) (Window c a)
-- addPlot w rf = liftF (AddPlot w rf id)





-- * Free


-- liftF :: Functor f => f r -> Free f r
-- liftF x = Free (fmap Pure x)

-- data Free f r = Free (f (Free f r)) | Pure r deriving Functor

-- instance Functor f => Applicative (Free f) where
--   pure = Pure

-- instance (Functor f) => Monad (Free f) where
--     return = pure
--     (Free x) >>= f = Free (fmap (>>= f) x)
--     (Pure r) >>= f = f r