module Utils where

import qualified Data.Aeson                 as Aeson
import           Data.ByteString            (ByteString)
import qualified Data.ByteString.Lazy.Char8 as BSL
import qualified Data.Text.Encoding         as TE
import           Data.Text.Lazy             (Text)
import qualified Data.Text.Lazy             as TL

import           Network.OAuth.OAuth2
import           URI.ByteString
import           Web.Scotty.Internal.Types

tlToBS :: TL.Text -> ByteString
tlToBS = TE.encodeUtf8 . TL.toStrict

bslToText :: BSL.ByteString -> Text
bslToText = TL.pack . BSL.unpack

paramValue :: Text -> [Param] -> [Text]
paramValue key = fmap snd . filter (hasParam key)

hasParam :: Text -> Param -> Bool
hasParam t = (== t) . fst

parseValue :: Aeson.FromJSON a => Maybe Aeson.Value -> Maybe a
parseValue Nothing = Nothing
parseValue (Just a) = case Aeson.fromJSON a of
  Aeson.Error _   -> Nothing
  Aeson.Success b -> Just b

createCodeUri :: OAuth2
  -> [(ByteString, ByteString)]
  -> Text
createCodeUri key params = TL.fromStrict $ TE.decodeUtf8 $ serializeURIRef'
  $ appendQueryParams params
  $ authorizationUrl key