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+{-# LANGUAGE UndecidableInstances #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{-# LANGUAGE StandaloneDeriving #-}
+{-# LANGUAGE RecordWildCards #-}
+--------------------------------------------------------------------------------
+module Xanthous.Game.Arbitrary where
+--------------------------------------------------------------------------------
+import           Xanthous.Prelude hiding (foldMap)
+--------------------------------------------------------------------------------
+import           Test.QuickCheck
+import           System.Random
+import           Data.Foldable (foldMap)
+--------------------------------------------------------------------------------
+import           Xanthous.Data.Levels
+import qualified Xanthous.Data.EntityMap as EntityMap
+import           Xanthous.Entities.Entities ()
+import           Xanthous.Entities.Character
+import           Xanthous.Game.State
+import           Xanthous.Orphans ()
+import           Xanthous.Util.QuickCheck (GenericArbitrary(..))
+--------------------------------------------------------------------------------
+
+deriving via GenericArbitrary GameLevel instance Arbitrary GameLevel
+
+instance Arbitrary GameState where
+  arbitrary = do
+    chr <- arbitrary @Character
+    _upStaircasePosition <- arbitrary
+    _messageHistory <- arbitrary
+    levs <- arbitrary @(Levels GameLevel)
+    _levelRevealedPositions <-
+      fmap setFromList
+      . sublistOf
+      . foldMap (EntityMap.positions . _levelEntities)
+      $ levs
+    let (_characterEntityID, _levelEntities) =
+          EntityMap.insertAtReturningID _upStaircasePosition (SomeEntity chr)
+          $ levs ^. current . levelEntities
+        _levels = levs & current .~ GameLevel {..}
+    _randomGen <- mkStdGen <$> arbitrary
+    let _promptState = NoPrompt -- TODO
+    _activePanel <- arbitrary
+    _debugState <- arbitrary
+    let _autocommand = NoAutocommand
+    _memo <- arbitrary
+    _savefile <- arbitrary
+    pure $ GameState {..}
+
+
+instance CoArbitrary GameLevel
+instance Function GameLevel
+instance CoArbitrary GameState
+instance Function GameState