module Opt(parseArgs,Options(..)) where

import System.Console.GetOpt
import Data.Maybe

-- import Vm

data Flag = File String
          | Time Int
          | Mem  Int
          | PowerPhrase String
            deriving Show

data Options = Options {  optFile :: [String]
                        , optTime :: Maybe Int
                        , optMem  :: Maybe Int
                        , optPowerPhrase :: Maybe String
                       }
               deriving Show

startOptions = Options { optFile = []
                       , optTime = Nothing
                       , optMem  = Nothing
                       , optPowerPhrase = Nothing
                       }

options :: [ OptDescr (Options -> IO Options) ]
options =  [ Option "f" ["filename"]
             (ReqArg
              (\arg opt -> return opt { optFile = (arg:(optFile opt)) })
              "FILE")
             "Input Filename"
           , Option "t" ["timelimit"]
             (ReqArg
              (\arg opt -> return opt { optTime = Just (read arg) })
              "TIMELIMIT")
             "Time Limit in seconds"
           , Option "m" ["memlimit"]
             (ReqArg
              (\arg opt -> return opt { optMem = Just (read arg) })
              "MEMLIMIT")
             "Memory Limit in MB"
           , Option "p" ["phrasepower"]
             (ReqArg
              (\arg opt -> return opt { optPowerPhrase = Just arg })
              "POWERPHRASE")
             "Power Phrase"
           ]

parseArgs :: [String] -> IO Options
parseArgs args = do
  let (actions, _, _) = getOpt RequireOrder options args
  opts <- foldl (>>=) (return startOptions) actions
  return opts