module Data.Char.CEDICT.GenerateCode
  ( readAndWrite
  ) where

import Data.Char.CEDICT.Reader.Parser
import Data.Char.CEDICT.Reader.ListRebuild
import Data.Char.CEDICT.C.Declarations

import System.IO.UTF8
import System.IO hiding
  ( appendFile
  , getContents
  , getLine
  , print
  , putStr
  , putStrLn
  , readFile
  , readLn
  , writeFile
  , hGetContents
  , hGetLine
  , hPutStr
  , hPutStrLn
  )
import Prelude hiding
  ( appendFile
  , getContents
  , getLine
  , print
  , putStr
  , putStrLn
  , readFile
  , readLn
  , writeFile
  )

import qualified Data.ByteString
import Control.Monad
import System.Time
import System.Locale

readAndWrite                ::  FilePath -> FilePath -> IO ()
readAndWrite dF cF           =  do
  parseHappening            <-  parseFile dF
  case parseHappening of
    Left err                ->  print err
    Right stuff             ->  do
      time                  <-  liftM toUTCTime getClockTime
      Data.ByteString.writeFile cF $ handleResults time stuff


handleResults time (tag, list) = Data.ByteString.concat
  [ toBytes . cHeader $ message time tag
  , toBytes "\n\n" 
  , toCDecl ts "ts"
  , toBytes "\n\n" 
  , toCDecl st "st"
  , toBytes "\n\n" 
  , toCDecl d "d"
  ] 
 where
  (d, ts, st)                =  majorLists list


cHeader note                 =  unlines
  [ " /* /"
  , note
  , " / */"
  , ""
  , "#include <stddef.h>"
  , ""
  ] 


message time tag             =  unlines
  [ "  Generated on " ++ (fmt time) ++ " from:"
  , "        " ++ tag
  , "  Changes will be overwritten the next time the generation script is run."
  ]
 where
  fmt = formatCalendarTime defaultTimeLocale "%Y-%m-%dT%H:%M:%SZ"