module Internal.Config
  ( readConfig
  , readYaml
  ) where

import           Control.Exception
-- import           Control.Lens

-- import           Data.Maybe
-- import qualified Data.Text         as T
-- import           Data.Typeable
-- import           Data.Void
import           Data.Yaml

import           Dhall             hiding (record)
-- import qualified Dhall.Core        as DC
-- import qualified Dhall.Map         as DM
-- import           Dhall.Src

import           Internal.Types

readConfig :: FilePath -> IO Config
readConfig confpath = do
  -- let subs = DM.fromList typeSubs
  -- let settings = over substitutions (DM.union subs) defaultEvaluateSettings
  -- unfix <$> inputFileWithSettings settings auto confpath
  unfix <$> inputFile auto confpath

-- typeSubs :: [(T.Text, DC.Expr Src Void)]
-- typeSubs = firstOrder ++ higherOrder
--   where
--     toVar a = fmap (\n -> (T.pack $ show n, maximum $ expected a))
--       $ listToMaybe $ snd $ splitTyConApp $ typeOf a
--     higherOrder =
--       [ ("ExpSplit", maximum $ expected (auto :: Decoder ExpSplit))
--       , ("ExpTx", maximum $ expected (auto :: Decoder ExpTx))
--       , ("SplitCur", maximum $ expected (auto :: Decoder SplitCur))
--       , ("SplitAcnt", maximum $ expected (auto :: Decoder SplitAcnt))
--       , ("CurID", maximum $ expected (auto :: Decoder CurID))
--       , ("AcntID", maximum $ expected (auto :: Decoder AcntID))
--       ]
--     firstOrder = catMaybes
--       [ toVar (auto :: Decoder TimeUnit)
--       , toVar (auto :: Decoder WeekdayPat)
--       , toVar (auto :: Decoder MDYPat)
--       , toVar (auto :: Decoder Gregorian)
--       , toVar (auto :: Decoder GregorianM)
--       , toVar (auto :: Decoder ModPat)
--       , toVar (auto :: Decoder CronPat)
--       , toVar (auto :: Decoder DatePat)
--       , toVar (auto :: Decoder Income)
--       , toVar (auto :: Decoder Tax)
--       , toVar (auto :: Decoder Bucket)
--       , toVar (auto :: Decoder TimeAmount)
--       , toVar (auto :: Decoder Expense)
--       , toVar (auto :: Decoder Decimal)
--       , toVar (auto :: Decoder Statement)
--       , toVar (auto :: Decoder Manual)
--       , toVar (auto :: Decoder TxOpts)
--       , toVar (auto :: Decoder ToTx)
--       , toVar (auto :: Decoder Match)
--       , toVar (auto :: Decoder MatchYMD)
--       , toVar (auto :: Decoder MatchVal)
--       , toVar (auto :: Decoder MatchDate)
--       , toVar (auto :: Decoder SplitNum)
--       , toVar (auto :: Decoder MatchDesc)
--       , toVar (auto :: Decoder MatchOther)
--       , toVar (auto :: Decoder SqlConfig)
--       ]

readYaml :: FromJSON a => FilePath -> IO a
readYaml p = do
  r <- decodeFileEither p
  case r of
    Right a -> return a
    Left e  -> throw e