-- QSize.hs
--
-- Check the disk usage of an installed packaged.

module Adelie.QSize (qSize) where

import System.Directory     (doesDirectoryExist)
import Control.Monad        (when)
import System.Posix.Files   (fileSize, getFileStatus)
import System.Posix.Types   (FileOffset)

import Adelie.Colour
import Adelie.Contents
import qualified Adelie.Error as E
import Adelie.Portage
import Adelie.Pretty

-- Size, Dir, Obj, Sym, Inaccessible
type Count = (FileOffset, Int, Int, Int, Int)

----------------------------------------------------------------

qSize :: [String] -> IO ()
qSize args = mapM_ size =<< findInstalledPackages args

size :: (String, String) -> IO ()
size catname = do
  putStr "Size of " >> putCatNameLn catname
  (size', dir, obj, sym, err) <- readContents count contents (0, 0, 0, 0, 0)
  putStr "    Directories: " >> putNumLn dir
  putStr "          Files: " >> putNumLn obj

  when (sym > 0) (putStr "          Links: " >> putNumLn sym)
  when (err > 0) (putStr "   Inaccessible: " >> putNumLn err)

  putStr "     Total size: " >> putSizeLn size'
  putChar '\n'
  where contents = contentsFromCatName catname

----------------------------------------------------------------

count :: Contents -> Count -> IO (Bool, Count)

count (Dir d) (s,w,x,y,z) = do
  r <- doesDirectoryExist d
  if r
    then return (False, (s,w+1,x,y,z))
    else return (False, (s,w,x,y,z+1)) 

count (Obj o _ _) (s,w,x,y,z) = do
  r <- E.try (getFileStatus o)
  case r of
    Left _err -> return (False, (s, w, x, y, z+1))
    Right st -> return (False, (s+fileSize st, w, x+1, y, z))

count (Sym _ _ _) (s,w,x,y,z) = return (False, (s,w,x,y+1,z))

----------------------------------------------------------------

putSizeLn :: FileOffset -> IO ()
putSizeLn n = cyan >> putStr (show (n `div` 1024)) >> putStr " kb" >> off2