module Main
where

import qualified Data.Array.Repa as R
import System.Environment (getArgs)

import Grid (zoom)
import MRI (
  flip_x,
  flip_y,
  mri_shape,
  mri_slice3d,
  read_word16s,
  round_array,
  swap_bytes,
  write_values_slice_to_bitmap,
  write_word16s,
  z_slice
  )

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


main :: IO ()
main = main3d

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 arrMRI        = R.reshape mri_shape arr'
  let dbl_data      = R.compute $ R.map fromIntegral arrMRI
  let output        = zoom dbl_data zoom_factor
  let word16_output = R.compute $ round_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 arrSlice  = R.computeUnboxed $ z_slice 50 $ flip_x $ flip_y $ swap_bytes arr
  let arrSlice' = R.reshape mri_slice3d arrSlice

  -- If zoom isn't being inlined we need to extract the slice before hand,
  -- and convert it to the require formed.
  let dbl_data  = R.compute $ R.map fromIntegral arrSlice'
  let output    = zoom dbl_data zoom_factor
  let arrSlice0 = R.computeUnboxed $ z_slice 0 output
  
  write_values_slice_to_bitmap arrSlice0 out_file