import qualified System.IO as IO

import Registry.Utils
import Registry.Grammar (registry)
import Registry.Registry

import System.Directory (createDirectoryIfMissing)

infile = "./language-subtag-registry"
outdir = "./registry-html"

display reg thistype thisvalue =
   -- We should always retrieve only one value, so we can take the head
   toHTML ((filter (onlyThisValue thistype thisvalue) 
                       (filter (onlyThisType thistype) reg)) !! 0)

toHTMLFiles reg thetype = 
  mapM (toHTMLfile reg thetype) (filter (onlyThisType thetype) reg)

toHTMLfile reg thistype thisvalue = do
  let outfile = outdir ++ "/" ++ thistype ++ "/" ++ (toSubtag thisvalue) ++ ".html"
  f <- IO.openFile (outfile) IO.WriteMode
  IO.hPutStr f (display reg thistype (toSubtag thisvalue))
  IO.hClose f

foreach [] func = return ()
foreach a func = do
   func (head a)
   foreach (tail a) func

main = do
  f <- IO.openFile (infile) IO.ReadMode
  input <- IO.hGetContents f
  let theregistry = getRegistry input
  foreach ["language", "script", "region", "variant", 
                         "redundant", "grandfathered"]
    (\arg ->
       createDirectoryIfMissing True (outdir ++ "/" ++ arg) >>
       toHTMLFiles theregistry arg)