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+--------------------------------------------------------------------------------
+module Xanthous.App.Time
+  ( stepGame
+  , stepGameBy
+  ) where
+--------------------------------------------------------------------------------
+import           Xanthous.Prelude
+--------------------------------------------------------------------------------
+import           System.Exit
+--------------------------------------------------------------------------------
+import           Xanthous.Data (Ticks)
+import           Xanthous.App.Prompt
+import qualified Xanthous.Data.EntityMap as EntityMap
+import           Xanthous.Entities.Character (isDead)
+import           Xanthous.Game.State
+import           Xanthous.Game.Prompt
+import           Xanthous.Game.Lenses
+import           Control.Monad.State (modify)
+--------------------------------------------------------------------------------
+
+
+stepGameBy :: Ticks -> AppM ()
+stepGameBy ticks = do
+  ents <- uses entities EntityMap.toEIDsAndPositioned
+  for_ ents $ \(eid, pEntity) -> do
+    pEntity' <- step ticks pEntity
+    entities . ix eid .= pEntity'
+
+  modify updateCharacterVision
+
+  whenM (uses character isDead)
+    . prompt_ @'Continue ["dead"] Uncancellable
+    . const . lift . liftIO
+    $ exitSuccess
+
+ticksPerTurn :: Ticks
+ticksPerTurn = 100
+
+stepGame :: AppM ()
+stepGame = stepGameBy ticksPerTurn