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Diffstat (limited to 'users/grfn/xanthous/src/Xanthous/Game/State.hs')
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diff --git a/users/grfn/xanthous/src/Xanthous/Game/State.hs b/users/grfn/xanthous/src/Xanthous/Game/State.hs new file mode 100644 index 000000000000..13b1ba158818 --- /dev/null +++ b/users/grfn/xanthous/src/Xanthous/Game/State.hs @@ -0,0 +1,572 @@ +{-# LANGUAGE StandaloneDeriving #-} +{-# LANGUAGE RecordWildCards #-} +{-# LANGUAGE UndecidableInstances #-} +{-# LANGUAGE TemplateHaskell #-} +{-# LANGUAGE GADTs #-} +{-# LANGUAGE AllowAmbiguousTypes #-} +-------------------------------------------------------------------------------- +module Xanthous.Game.State + ( GameState(..) + , entities + , levels + , revealedPositions + , messageHistory + , randomGen + , activePanel + , promptState + , characterEntityID + , autocommand + , savefile + , memo + , GamePromptState(..) + + -- * Game Level + , GameLevel(..) + , levelEntities + , upStaircasePosition + , levelRevealedPositions + + -- * Messages + , MessageHistory(..) + , HasMessages(..) + , HasTurn(..) + , HasDisplayedTurn(..) + , pushMessage + , previousMessage + , nextTurn + + -- * Autocommands + , Autocommand(..) + , AutocommandState(..) + , _NoAutocommand + , _ActiveAutocommand + + -- * App monad + , AppT(..) + , AppM + , runAppT + + -- * Entities + , Draw(..) + , Brain(..) + , Brainless(..) + , brainVia + , Collision(..) + , Entity(..) + , SomeEntity(..) + , downcastEntity + , _SomeEntity + , entityIs + , entityTypeName + + -- ** Vias + , Color(..) + , DrawNothing(..) + , DrawRawChar(..) + , DrawRawCharPriority(..) + , DrawCharacter(..) + , DrawStyledCharacter(..) + , DeriveEntity(..) + -- ** Field classes + , HasChar(..) + , HasStyle(..) + + -- * Debug State + , DebugState(..) + , debugState + , allRevealed + ) where +-------------------------------------------------------------------------------- +import Xanthous.Prelude +-------------------------------------------------------------------------------- +import Data.List.NonEmpty ( NonEmpty((:|))) +import qualified Data.List.NonEmpty as NonEmpty +import Data.Typeable +import Data.Coerce +import System.Random +import Test.QuickCheck +import Test.QuickCheck.Arbitrary.Generic +import Control.Monad.Random.Class +import Control.Monad.State +import Control.Monad.Trans.Control (MonadTransControl(..)) +import Control.Monad.Trans.Compose +import Control.Monad.Morph (MFunctor(..)) +import Brick (EventM, Widget, raw, str, emptyWidget) +import Data.Aeson (ToJSON(..), FromJSON(..), Value(Null)) +import qualified Data.Aeson as JSON +import Data.Aeson.Generic.DerivingVia +import Data.Generics.Product.Fields +import qualified Graphics.Vty.Attributes as Vty +import qualified Graphics.Vty.Image as Vty +-------------------------------------------------------------------------------- +import Xanthous.Util (KnownBool(..)) +import Xanthous.Data +import Xanthous.Data.App +import Xanthous.Data.Levels +import Xanthous.Data.EntityMap (EntityMap, EntityID) +import Xanthous.Data.EntityChar +import Xanthous.Data.VectorBag +import Xanthous.Data.Entities +import Xanthous.Orphans () +import Xanthous.Game.Prompt +import Xanthous.Game.Env +import Xanthous.Game.Memo (MemoState) +-------------------------------------------------------------------------------- + +data MessageHistory + = MessageHistory + { _messages :: Map Word (NonEmpty Text) + , _turn :: Word + , _displayedTurn :: Maybe Word + } + deriving stock (Show, Eq, Generic) + deriving anyclass (NFData, CoArbitrary, Function) + deriving Arbitrary via GenericArbitrary MessageHistory + deriving (ToJSON, FromJSON) + via WithOptions '[ FieldLabelModifier '[Drop 1] ] + MessageHistory +makeFieldsNoPrefix ''MessageHistory + +instance Semigroup MessageHistory where + (MessageHistory msgs₁ turn₁ dt₁) <> (MessageHistory msgs₂ turn₂ dt₂) = + MessageHistory (msgs₁ <> msgs₂) (max turn₁ turn₂) $ case (dt₁, dt₂) of + (_, Nothing) -> Nothing + (Just t, _) -> Just t + (Nothing, Just t) -> Just t + +instance Monoid MessageHistory where + mempty = MessageHistory mempty 0 Nothing + +type instance Element MessageHistory = [Text] +instance MonoFunctor MessageHistory where + omap f mh@(MessageHistory _ t _) = + mh & messages . at t %~ (NonEmpty.nonEmpty . f . toList =<<) + +instance MonoComonad MessageHistory where + oextract (MessageHistory ms t dt) = maybe [] toList $ ms ^. at (fromMaybe t dt) + oextend cok mh@(MessageHistory _ t dt) = + mh & messages . at (fromMaybe t dt) .~ NonEmpty.nonEmpty (cok mh) + +pushMessage :: Text -> MessageHistory -> MessageHistory +pushMessage msg mh@(MessageHistory _ turn' _) = + mh + & messages . at turn' %~ \case + Nothing -> Just $ msg :| mempty + Just msgs -> Just $ msg <| msgs + & displayedTurn .~ Nothing + +nextTurn :: MessageHistory -> MessageHistory +nextTurn = (turn +~ 1) . (displayedTurn .~ Nothing) + +previousMessage :: MessageHistory -> MessageHistory +previousMessage mh = mh & displayedTurn .~ maximumOf + (messages . ifolded . asIndex . filtered (< mh ^. turn)) + mh + + +-------------------------------------------------------------------------------- + +data GamePromptState m where + NoPrompt :: GamePromptState m + WaitingPrompt :: Text -> Prompt m -> GamePromptState m + deriving stock (Show, Generic) + deriving anyclass (NFData) + +-- | Non-injective! We never try to serialize waiting prompts, since: +-- +-- * they contain callback functions +-- * we can't save the game when in a prompt anyway +instance ToJSON (GamePromptState m) where + toJSON _ = Null + +-- | Always expects Null +instance FromJSON (GamePromptState m) where + parseJSON Null = pure NoPrompt + parseJSON _ = fail "Invalid GamePromptState; expected null" + +instance CoArbitrary (GamePromptState m) where + coarbitrary NoPrompt = variant @Int 1 + coarbitrary (WaitingPrompt txt _) = variant @Int 2 . coarbitrary txt + +instance Function (GamePromptState m) where + function = functionMap onlyNoPrompt (const NoPrompt) + where + onlyNoPrompt NoPrompt = () + onlyNoPrompt (WaitingPrompt _ _) = + error "Can't handle prompts in Function!" + +-------------------------------------------------------------------------------- + +newtype AppT m a + = AppT { unAppT :: ReaderT GameEnv (StateT GameState m) a } + deriving ( Functor + , Applicative + , Monad + , MonadState GameState + , MonadReader GameEnv + , MonadIO + ) + via (ReaderT GameEnv (StateT GameState m)) + deriving ( MonadTrans + , MFunctor + ) + via (ReaderT GameEnv `ComposeT` StateT GameState) + +type AppM = AppT (EventM ResourceName) + +-------------------------------------------------------------------------------- + +class Draw a where + drawWithNeighbors :: Neighbors (VectorBag SomeEntity) -> a -> Widget n + drawWithNeighbors = const draw + + draw :: a -> Widget n + draw = drawWithNeighbors $ pure mempty + + -- | higher priority gets drawn on top + drawPriority :: a -> Word + drawPriority = const minBound + +instance Draw a => Draw (Positioned a) where + drawWithNeighbors ns (Positioned _ a) = drawWithNeighbors ns a + draw (Positioned _ a) = draw a + +newtype DrawCharacter (char :: Symbol) (a :: Type) where + DrawCharacter :: a -> DrawCharacter char a + +instance KnownSymbol char => Draw (DrawCharacter char a) where + draw _ = str $ symbolVal @char Proxy + +data Color = Black | Red | Green | Yellow | Blue | Magenta | Cyan | White + +class KnownColor (color :: Color) where + colorVal :: forall proxy. proxy color -> Vty.Color + +instance KnownColor 'Black where colorVal _ = Vty.black +instance KnownColor 'Red where colorVal _ = Vty.red +instance KnownColor 'Green where colorVal _ = Vty.green +instance KnownColor 'Yellow where colorVal _ = Vty.yellow +instance KnownColor 'Blue where colorVal _ = Vty.blue +instance KnownColor 'Magenta where colorVal _ = Vty.magenta +instance KnownColor 'Cyan where colorVal _ = Vty.cyan +instance KnownColor 'White where colorVal _ = Vty.white + +class KnownMaybeColor (maybeColor :: Maybe Color) where + maybeColorVal :: forall proxy. proxy maybeColor -> Maybe Vty.Color + +instance KnownMaybeColor 'Nothing where maybeColorVal _ = Nothing +instance KnownColor color => KnownMaybeColor ('Just color) where + maybeColorVal _ = Just $ colorVal @color Proxy + +newtype DrawStyledCharacter (fg :: Maybe Color) (bg :: Maybe Color) (char :: Symbol) (a :: Type) where + DrawStyledCharacter :: a -> DrawStyledCharacter fg bg char a + +instance + ( KnownMaybeColor fg + , KnownMaybeColor bg + , KnownSymbol char + ) + => Draw (DrawStyledCharacter fg bg char a) where + draw _ = raw $ Vty.string attr $ symbolVal @char Proxy + where attr = Vty.Attr + { Vty.attrStyle = Vty.Default + , Vty.attrForeColor = maybe Vty.Default Vty.SetTo + $ maybeColorVal @fg Proxy + , Vty.attrBackColor = maybe Vty.Default Vty.SetTo + $ maybeColorVal @bg Proxy + , Vty.attrURL = Vty.Default + } + +instance Draw EntityChar where + draw EntityChar{..} = raw $ Vty.string _style [_char] + +-------------------------------------------------------------------------------- + +newtype DrawNothing (a :: Type) = DrawNothing a + +instance Draw (DrawNothing a) where + draw = const emptyWidget + drawPriority = const 0 + +newtype DrawRawChar (rawField :: Symbol) (a :: Type) = DrawRawChar a + +instance + forall rawField a raw. + ( HasField rawField a a raw raw + , HasChar raw EntityChar + ) => Draw (DrawRawChar rawField a) where + draw (DrawRawChar e) = draw $ e ^. field @rawField . char + +newtype DrawRawCharPriority + (rawField :: Symbol) + (priority :: Nat) + (a :: Type) + = DrawRawCharPriority a + +instance + forall rawField priority a raw. + ( HasField rawField a a raw raw + , KnownNat priority + , HasChar raw EntityChar + ) => Draw (DrawRawCharPriority rawField priority a) where + draw (DrawRawCharPriority e) = draw $ e ^. field @rawField . char + drawPriority = const . fromIntegral $ natVal @priority Proxy + + +-------------------------------------------------------------------------------- + +class Brain a where + step :: Ticks -> Positioned a -> AppM (Positioned a) + -- | Does this entity ever move on its own? + entityCanMove :: a -> Bool + entityCanMove = const False + +newtype Brainless a = Brainless a + +instance Brain (Brainless a) where + step = const pure + +-- | Workaround for the inability to use DerivingVia on Brain due to the lack of +-- higher-order roles (specifically AppT not having its last type argument have +-- role representational bc of StateT) +brainVia + :: forall brain entity. (Coercible entity brain, Brain brain) + => (entity -> brain) -- ^ constructor, ignored + -> (Ticks -> Positioned entity -> AppM (Positioned entity)) +brainVia _ ticks = fmap coerce . step ticks . coerce @_ @(Positioned brain) + +-------------------------------------------------------------------------------- + +class ( Show a, Eq a, Ord a, NFData a + , ToJSON a, FromJSON a + , Draw a, Brain a + ) => Entity a where + entityAttributes :: a -> EntityAttributes + entityAttributes = const defaultEntityAttributes + description :: a -> Text + entityChar :: a -> EntityChar + entityCollision :: a -> Maybe Collision + entityCollision = const $ Just Stop + +data SomeEntity where + SomeEntity :: forall a. (Entity a, Typeable a) => a -> SomeEntity + +instance Show SomeEntity where + show (SomeEntity e) = "SomeEntity (" <> show e <> ")" + +instance Eq SomeEntity where + (SomeEntity (a :: ea)) == (SomeEntity (b :: eb)) = case eqT @ea @eb of + Just Refl -> a == b + _ -> False + +instance Ord SomeEntity where + compare (SomeEntity (a :: ea)) (SomeEntity (b :: eb)) = case eqT @ea @eb of + Just Refl -> compare a b + _ -> compare (typeRep $ Proxy @ea) (typeRep $ Proxy @eb) + + +instance NFData SomeEntity where + rnf (SomeEntity ent) = ent `deepseq` () + +instance ToJSON SomeEntity where + toJSON (SomeEntity ent) = entityToJSON ent + where + entityToJSON :: forall entity. (Entity entity, Typeable entity) + => entity -> JSON.Value + entityToJSON entity = JSON.object + [ "type" JSON..= tshow (typeRep @_ @entity Proxy) + , "data" JSON..= toJSON entity + ] + +instance Draw SomeEntity where + drawWithNeighbors ns (SomeEntity ent) = drawWithNeighbors ns ent + drawPriority (SomeEntity ent) = drawPriority ent + +instance Brain SomeEntity where + step ticks (Positioned p (SomeEntity ent)) = + fmap SomeEntity <$> step ticks (Positioned p ent) + entityCanMove (SomeEntity ent) = entityCanMove ent + +downcastEntity :: forall (a :: Type). (Typeable a) => SomeEntity -> Maybe a +downcastEntity (SomeEntity e) = cast e + +entityIs :: forall (a :: Type). (Typeable a) => SomeEntity -> Bool +entityIs = isJust . downcastEntity @a + +_SomeEntity :: forall a. (Entity a, Typeable a) => Prism' SomeEntity a +_SomeEntity = prism' SomeEntity downcastEntity + +-- | Get the name of the type of 'SomeEntity' as a string +entityTypeName :: SomeEntity -> Text +entityTypeName (SomeEntity e) = pack . tyConName . typeRepTyCon $ typeOf e + +newtype DeriveEntity + (blocksVision :: Bool) + (description :: Symbol) + (entityChar :: Symbol) + (entity :: Type) + = DeriveEntity entity + deriving newtype (Show, Eq, Ord, NFData, ToJSON, FromJSON, Draw) + +instance Brain entity => Brain (DeriveEntity b d c entity) where + step = brainVia $ \(DeriveEntity e) -> e + +instance + ( KnownBool blocksVision + , KnownSymbol description + , KnownSymbol entityChar + , Show entity, Eq entity, Ord entity, NFData entity + , ToJSON entity, FromJSON entity + , Draw entity, Brain entity + ) + => Entity (DeriveEntity blocksVision description entityChar entity) where + entityAttributes _ = defaultEntityAttributes + & blocksVision .~ boolVal @blocksVision + description _ = pack . symbolVal $ Proxy @description + entityChar _ = fromString . symbolVal $ Proxy @entityChar + +-------------------------------------------------------------------------------- + +data GameLevel = GameLevel + { _levelEntities :: !(EntityMap SomeEntity) + , _upStaircasePosition :: !Position + , _levelRevealedPositions :: !(Set Position) + } + deriving stock (Show, Eq, Generic) + deriving anyclass (NFData) + deriving (ToJSON) + via WithOptions '[ FieldLabelModifier '[Drop 1] ] + GameLevel + +-------------------------------------------------------------------------------- + +data Autocommand + = AutoMove Direction + | AutoRest + deriving stock (Show, Eq, Ord, Generic) + deriving anyclass (NFData, Hashable, ToJSON, FromJSON, CoArbitrary, Function) + deriving Arbitrary via GenericArbitrary Autocommand +{-# ANN module ("HLint: ignore Use newtype instead of data" :: String) #-} + +data AutocommandState + = NoAutocommand + | ActiveAutocommand Autocommand (Async ()) + deriving stock (Eq, Ord, Generic) + deriving anyclass (Hashable) + +instance Show AutocommandState where + show NoAutocommand = "NoAutocommand" + show (ActiveAutocommand ac _) = + "(ActiveAutocommand " <> show ac <> " <Async>)" + +instance ToJSON AutocommandState where + toJSON = const Null + +instance FromJSON AutocommandState where + parseJSON Null = pure NoAutocommand + parseJSON _ = fail "Invalid AutocommandState; expected null" + +instance NFData AutocommandState where + rnf NoAutocommand = () + rnf (ActiveAutocommand ac t) = ac `deepseq` t `seq` () + +instance CoArbitrary AutocommandState where + coarbitrary NoAutocommand = variant @Int 1 + coarbitrary (ActiveAutocommand ac t) + = variant @Int 2 + . coarbitrary ac + . coarbitrary (hash t) + +instance Function AutocommandState where + function = functionMap onlyNoAC (const NoAutocommand) + where + onlyNoAC NoAutocommand = () + onlyNoAC _ = error "Can't handle autocommands in Function" + +-------------------------------------------------------------------------------- + + +data DebugState = DebugState + { _allRevealed :: !Bool + } + deriving stock (Show, Eq, Generic) + deriving anyclass (NFData, CoArbitrary, Function) + deriving (ToJSON, FromJSON) + via WithOptions '[ FieldLabelModifier '[Drop 1] ] + DebugState +{-# ANN DebugState ("HLint: ignore Use newtype instead of data" :: String) #-} + +instance Arbitrary DebugState where + arbitrary = genericArbitrary + +data GameState = GameState + { _levels :: !(Levels GameLevel) + , _characterEntityID :: !EntityID + , _messageHistory :: !MessageHistory + , _randomGen :: !StdGen + + -- | The active panel displayed in the UI, if any + , _activePanel :: !(Maybe Panel) + + , _promptState :: !(GamePromptState AppM) + , _debugState :: !DebugState + , _autocommand :: !AutocommandState + + -- | The path to the savefile that was loaded for this game, if any + , _savefile :: !(Maybe FilePath) + + , _memo :: MemoState + } + deriving stock (Show, Generic) + deriving anyclass (NFData) + deriving (ToJSON) + via WithOptions '[ FieldLabelModifier '[Drop 1] ] + GameState + +makeLenses ''GameLevel +makeLenses ''GameState + +entities :: Lens' GameState (EntityMap SomeEntity) +entities = levels . current . levelEntities + +revealedPositions :: Lens' GameState (Set Position) +revealedPositions = levels . current . levelRevealedPositions + +instance Eq GameState where + (==) = (==) `on` \gs -> + ( gs ^. entities + , gs ^. revealedPositions + , gs ^. characterEntityID + , gs ^. messageHistory + , gs ^. activePanel + , gs ^. debugState + ) + +-------------------------------------------------------------------------------- + +runAppT :: Monad m => AppT m a -> GameEnv -> GameState -> m (a, GameState) +runAppT appt env initialState + = flip runStateT initialState + . flip runReaderT env + . unAppT + $ appt + +instance (Monad m) => MonadRandom (AppT m) where + getRandomR rng = randomGen %%= randomR rng + getRandom = randomGen %%= random + getRandomRs rng = uses randomGen $ randomRs rng + getRandoms = uses randomGen randoms + +instance MonadTransControl AppT where + type StT AppT a = (a, GameState) + liftWith f + = AppT + . ReaderT $ \e + -> StateT $ \s + -> (,s) <$> f (\action -> runAppT action e s) + restoreT = AppT . ReaderT . const . StateT . const + +-------------------------------------------------------------------------------- + +makeLenses ''DebugState +makePrisms ''AutocommandState |