{-# LANGUAGE OverloadedStrings #-}

module Main where

import           Data.Ini.Config
import           Data.Text (Text)
import qualified Data.Text.IO as T

data Config = Config
  { cfNetwork :: NetworkConfig, cfLocal :: Maybe LocalConfig }
    deriving (Eq, Show)

data NetworkConfig = NetworkConfig
  { netHost :: String, netPort :: Int }
    deriving (Eq, Show)

data LocalConfig = LocalConfig
  { localUser :: Text }
    deriving (Eq, Show)

configParser :: IniParser Config
configParser = do
  netCf <- section "NETWORK" $ do
    host <- fieldOf "host" string
    port <- fieldOf "port" number
    return NetworkConfig { netHost = host, netPort = port }
  locCf <- sectionMb "LOCAL" $
    LocalConfig `fmap` field "user"
  return Config { cfNetwork = netCf, cfLocal = locCf }

main :: IO ()
main = do
  rs <- T.getContents
  print (parseIniFile rs configParser)