module Main
where

import qualified Data.Array.Repa as R (map, force, reshape)
import qualified Data.Array.Repa.IO.BMP as R (writeComponentsToBMP)
import System.Environment (getArgs)

import Grid (make_grid, zoom)
import MRI
import Values (drop_z, zoom_shape)

main :: IO ()
main =  main2d

in_file :: FilePath
in_file = "./data/mri.bin"

main3d :: IO ()
main3d = do
  (s:_) <- getArgs
  let scale = read s :: Int
  let zoom_factor = (scale, scale, scale)
  let out_file = "output.bin"
  arr <- read_word16s in_file
  let arr' = swap_bytes arr
--  let arrInv   = flip_x $ flip_y arr'
  let arrMRI = R.reshape mri_shape arr'
  let dbl_data = R.force $ R.map fromIntegral arrMRI
  let g = make_grid 1 dbl_data
  let output = zoom g zoom_factor
  let word16_output = bracket_array output
  write_word16s out_file word16_output

main2d :: IO ()
main2d = do
  (s:_) <- getArgs
  let scale = read s :: Int
  let zoom_factor = (1, scale, scale)
  let out_file = "output.bmp"
  arr <- read_word16s in_file
  let arr' = swap_bytes arr
  let arrInv   = flip_x $ flip_y arr'
  let arrSlice = z_slice 50 arrInv
  let arrSlice' = R.reshape mri_slice3d arrSlice
  let dbl_data = R.map fromIntegral arrSlice'
  let g = make_grid 1 dbl_data
  let output = zoom g zoom_factor
  let arrBrack = bracket_array output
  let mri_slice2d = drop_z $ zoom_shape zoom_factor mri_slice3d
  let colors = values_to_colors $ R.reshape mri_slice2d
                                $ R.map fromIntegral arrBrack
  let routput = R.map (\(red, _,     _)    -> red)   colors
  let goutput = R.map (\(_,   green, _)    -> green) colors
  let boutput = R.map (\(_,   _,     blue) -> blue)  colors
  R.writeComponentsToBMP out_file routput goutput boutput