module Main where

-- import Control.Monad (forM_)
-- import Data.Ratio

import Graphics.Rendering.Plot.Light

import qualified Data.Attoparsec.Text as A
import qualified Data.Text as T 
import qualified Data.Text.IO as T (readFile, writeFile)
import Data.Scientific (Scientific, toRealFloat)
import Text.Blaze.Svg.Renderer.String (renderSvg)
import Text.Blaze.Svg

import qualified Data.Colour.Names as C
import qualified Data.Colour as C

import Data.Parsers

fname = "data/heatmap-bw"

xPlot = 400
yPlot = 300
fnameOut = "data/heatmap-1.svg"

-- fdat :: FigureData Double
fdat = FigureData xPlot yPlot 0.1 0.8 0.1 0.9 10

palette0 = palette [C.blue, C.white, C.red] 15


-- main :: IO ()
-- main = do
--   dat <- T.readFile fname
--   let pd = A.parseOnly (gridNum space) dat
--   case pd of Left e -> error e
--              Right d -> do
--                   let pixels = heatmap fdat palette0 d
--                       svg_t = svgHeader xPlot yPlot pixels
--                   -- putStrLn $ renderSvg svg_t
--                   T.writeFile fnameOut $ T.pack $ renderSvg svg_t 
    
  


main = do
  let 
    p1 = Point (-2) (-2)
    p2 = Point 2 2
    frame = mkFrame p1 p2
    nx = 50
    ny = 50
    f x y = cos ( pi * theta ) * sin r 
      where
      r = x'**2 + y'**2
      theta = atan2 y' x'
      (x', y') = (fromRational x, fromRational y)
    lps = plotFun2 f $ meshGrid frame nx ny
    vmin = minimum $ _lplabel <$> lps
    vmax = maximum $ _lplabel <$> lps       
    pixels = heatmap' fdat palette0 frame (fromIntegral nx) (fromIntegral ny) lps
    cbar = colourBar fdat palette0 10 vmin vmax 10 TopRight 100
    svg_t = svgHeader xPlot yPlot $ do
      axes fdat frame 2 C.black 10 10
      pixels
      cbar
  T.writeFile "data/heatmap-3.svg" $ T.pack $ renderSvg svg_t
  
        

-- withMeshGrid :: (RealFrac a, Enum a) =>
--     Point a -> Point a -> a -> a -> (Frame a -> [Point a] -> t) -> t
-- withMeshGrid p1 p2 nx ny f =
--   withFrame p1 p2 $ \fr -> let
--   grid = meshGrid fr nx ny in f fr grid 

-- withFrame p1 p2 f = f frame where
--   frame = mkFrame p1 p2




-- parsers

-- | Parse a row of numbers, separated by `sep`
rowNums :: A.Parser s -> A.Parser [Scientific]
rowNums = A.sepBy A.scientific

rowNumSpace :: A.Parser [Scientific]
rowNumSpace = rowNums space

-- | parse a grid of numbers, separated by `sep`
gridNum :: A.Parser s -> A.Parser [[Scientific]]
gridNum sep = A.sepBy (rowNums sep) A.endOfLine