module Main where

import System.Posix.Directory ( getWorkingDirectory )
import System.Directory
    ( pathIsSymbolicLink, doesFileExist, getFileSize, doesDirectoryExist )
import Data.Functor ( (<&>) )
import Control.Monad ( filterM )
import System.Directory.Extra ( listContents )
import Brick

listNonSymFiles :: FilePath -> IO [FilePath]
listNonSymFiles dir = filterM (fmap not . pathIsSymbolicLink) =<< filterM doesFileExist =<< listContents dir

listNonSymDirectories :: FilePath -> IO [FilePath]
listNonSymDirectories dir = filterM (fmap not . pathIsSymbolicLink) =<< filterM doesDirectoryExist =<< listContents dir

getSizeSubpaths :: FilePath -> IO [(FilePath, Integer)]
getSizeSubpaths x = do
  sub   <- listNonSymDirectories x
  subby <- mapM (\y -> (y,) . sum . map snd <$> getSizeSubpaths y) sub
  local <- listNonSymFiles x >>= (\y -> mapM getFileSize y <&> zip y)
  return $ local ++ subby

main :: IO ()
main = do
  a <- getWorkingDirectory
  print =<< getSizeSubpaths a