module Text.Madlibs.Cata.Run (run) where
import Control.Monad.Random.Class
import qualified Data.Text as T
import Text.Madlibs.Internal.Types
import Text.Madlibs.Internal.Utils
run :: (MonadRandom m) => RandTok -> m T.Text
run tok@List{} = do
value <- getRandomR (0,1)
let ret = ((snd . head) . filter ((>=value) . fst)) $ mkCdf tok
case ret of
(Value txt) -> pure txt
tokNest@List{} -> run tokNest
run (Value txt) = pure txt
mkCdf :: RandTok -> [(Double, RandTok)]
mkCdf (List rs) = zip (cdf . map fst $ rs) (map snd rs)
mkCdf v@Value{} = [(1, v)]