{-# LANGUAGE CPP #-}

module Main where


import qualified Options.Applicative as O

import qualified Data.ByteString as BS

import qualified System.IO as IO

import Sound.Libcdio
import Sound.Libcdio.Read.CdText

#if MIN_VERSION_base(4,11,0)
#else
import Data.Monoid ( (<>) )
#endif

import Options.Applicative ( (<|>), (<**>) )


data Options = Options
    { source :: FilePath
    , sink :: Maybe FilePath
    , help :: Bool
    }
  deriving ( Eq, Ord, Show, Read )


options :: O.Parser Options
options = Options
    <$> O.strArgument (O.metavar "FILE")
    <*> output
    <*> O.switch
        (   O.long "help"
         <> O.short 'h'
         <> O.help "Print this help message"
        )

output :: O.Parser (Maybe FilePath)
output = O.flag' Nothing
        (   O.long "stdout"
         <> O.short 'O'
         <> O.help "Echo the resulting binary blob to stdout"
        )
    <|> Just <$> O.strOption
        (   O.long "output"
         <> O.short 'o'
         <> O.metavar "FILE"
         <> O.value "cdtext.dat"
         <> O.help "Where to save the resulting CDTEXT blob"
        )

description :: O.InfoMod a
description = O.fullDesc
     <> O.progDesc "Generate a binary CDTEXT file from readable data"


main :: IO ()
main = do
    os <- O.execParser $ O.info (options <**> O.helper) description
    if help os
    then putStrLn "TODO: Print the help"
    else do
        let write p = case sink os of
                Just f -> IO.withBinaryFile f IO.WriteMode $ flip BS.hPut p
                Nothing -> BS.putStr p
        bs <- open (Just $ source os) False cdTextRaw
        case bs of
            Right (Just bs') -> write bs'
            Right Nothing -> IO.hPutStrLn IO.stderr "No CDTEXT on disc"
            _ -> IO.hPutStrLn IO.stderr "Unable to open device"