module Main
where

import Data.Array.Repa (
  DIM2,
  DIM3,
  Z(..),
  (:.)(..),
  slice,
  reshape,
  Any(..),
  All(..)
  )
import qualified Data.Array.Repa as R (map)

import Data.Array.Repa.IO.BMP (writeComponentsToBMP)
import Data.Word
import System.Environment (getArgs)

import Grid (make_grid, zoom)
import MRI
import Values (read_values_3d, write_values_1d)

mri_shape2d :: DIM2
mri_shape2d = (Z :. 256*2 :. 256*2)

mri_shape3d :: DIM3
mri_shape3d = (Z :. 256 :. 256 :. 1)

main :: IO ()
main = do
--  args <- getArgs
--  let color = head args
--  let in_file  = "./data/MRbrain.40." ++ color
  let out_file = "MRbrain.50.red.out"
  arr <- read_word16s
  let arrBrack = bracket_array arr
  let arrInv   = flip_x $ flip_y arrBrack
  let arrSlice = slice arrInv (Any :. (50 :: Int) :. All :. All)
  let arrColor = raw_data_to_color arrSlice

  let arrColor' = reshape mri_shape3d arrColor
  let rdata = red_dbl_data arrColor'
  let gdata = green_dbl_data arrColor'
  let bdata = blue_dbl_data arrColor'

--  mridata <- read_values_3d mri_shape in_file

  let gr = make_grid 1 rdata
  let routput = zoom gr (2,2,1)

  let gg = make_grid 1 gdata
  let goutput = zoom gg (2,2,1)

  let gb = make_grid 1 bdata
  let boutput = zoom gb (2,2,1)

  let routput' = R.map double_to_word8 (reshape mri_shape2d routput)
  let goutput' = R.map double_to_word8 (reshape mri_shape2d goutput)
  let boutput' = R.map double_to_word8 (reshape mri_shape2d boutput)

--  write_values_1d output out_file
  writeComponentsToBMP out_file routput' goutput' boutput'
  where
    double_to_word8 :: Double -> Word8
    double_to_word8 x =
      if x > 255 then
        255 :: Word8
      else
        if x < 0 then
          0 :: Word8
        else
          fromIntegral $ truncate x