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{-# LANGUAGE OverloadedStrings #-}

module Conf
  ( get
  , Conf(..)
  ) where

import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.ConfigManager as Conf
import Data.Time.Clock (NominalDiffTime)

import Common.Model (Currency(..))

data Conf = Conf
  { hostname :: Text
  , port :: Int
  , signInExpiration :: NominalDiffTime
  , currency :: Currency
  , noReplyMail :: Text
  , https :: Bool
  } deriving Show

get :: FilePath -> IO Conf
get path = do
  conf <-
    (flip fmap) (Conf.readConfig path) (\configOrError -> do
      conf <- configOrError
      Conf <$>
        Conf.lookup "hostname" conf <*>
        Conf.lookup "port" conf <*>
        Conf.lookup "signInExpiration" conf <*>
        fmap Currency (Conf.lookup "currency" conf) <*>
        Conf.lookup "noReplyMail" conf <*>
        Conf.lookup "https" conf
    )
  case conf of
    Left msg -> error (T.unpack msg)
    Right c -> return c