chore(users): grfn -> aspen

Change-Id: I6c6847fac56f0a9a1a2209792e00a3aec5e672b9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10809
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>

users/aspen/xanthous/src/Xanthous/AI/Gormlak.hs

@@ -0,0 +1,201 @@
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{-# LANGUAGE UndecidableInstances #-}
+--------------------------------------------------------------------------------
+module Xanthous.AI.Gormlak
+  ( HasVisionRadius(..)
+  , GormlakBrain(..)
+  ) where
+--------------------------------------------------------------------------------
+import           Xanthous.Prelude hiding (lines)
+--------------------------------------------------------------------------------
+import           Control.Monad.State
+import           Control.Monad.Random
+import           Data.Aeson (object)
+import qualified Data.Aeson as A
+import           Data.Generics.Product.Fields
+--------------------------------------------------------------------------------
+import           Xanthous.Data
+                 ( Positioned(..), positioned, position, _Position
+                 , diffPositions, stepTowards, isUnit
+                 , Ticks, (|*|), invertedRate
+                 )
+import           Xanthous.Data.EntityMap
+import           Xanthous.Entities.Creature.Hippocampus
+import           Xanthous.Entities.Character (Character)
+import qualified Xanthous.Entities.Character as Character
+import qualified Xanthous.Entities.RawTypes as Raw
+import           Xanthous.Entities.RawTypes
+                 ( CreatureType, HasLanguage(language), getLanguage
+                 , HasAttacks (attacks), creatureAttackMessage
+                 )
+import           Xanthous.Entities.Common
+                 ( wielded, Inventory, wieldedItems, WieldedItem (WieldedItem) )
+import           Xanthous.Game.State
+import           Xanthous.Game.Lenses
+                 ( entitiesCollision, collisionAt
+                 , character, characterPosition, positionIsCharacterVisible
+                 , hearingRadius
+                 )
+import           Xanthous.Data.EntityMap.Graphics (linesOfSight, canSee)
+import           Xanthous.Random
+import           Xanthous.Monad (say, message)
+import           Xanthous.Generators.Speech (word)
+import qualified Linear.Metric as Metric
+import qualified Xanthous.Messages as Messages
+--------------------------------------------------------------------------------
+
+--  TODO move the following two classes to a more central location
+
+class HasVisionRadius a where visionRadius :: a -> Word
+
+type IsCreature entity =
+  ( HasVisionRadius entity
+  , HasField "_hippocampus" entity entity Hippocampus Hippocampus
+  , HasField "_creatureType" entity entity CreatureType CreatureType
+  , HasField "_inventory" entity entity Inventory Inventory
+  , A.ToJSON entity
+  )
+
+--------------------------------------------------------------------------------
+
+stepGormlak
+  :: forall entity m.
+    ( MonadState GameState m, MonadRandom m
+    , IsCreature entity
+    )
+  => Ticks
+  -> Positioned entity
+  -> m (Positioned entity)
+stepGormlak ticks pe@(Positioned pos creature) = do
+  canSeeCharacter <- uses entities $ canSee (entityIs @Character) pos vision
+
+  let selectDestination pos' creature' = destinationFromPos <$> do
+        if canSeeCharacter
+          then do
+            charPos <- use characterPosition
+            if isUnit (pos' `diffPositions` charPos)
+              then attackCharacter $> pos'
+              else pure $ pos' `stepTowards` charPos
+        else do
+          lines <- map (takeWhile (isNothing . entitiesCollision . map snd . snd)
+                      -- the first item on these lines is always the creature itself
+                      . fromMaybe mempty . tailMay)
+                  . linesOfSight pos' (visionRadius creature')
+                  <$> use entities
+          line <- choose $ weightedBy length lines
+          pure $ fromMaybe pos' $ fmap fst . headMay =<< line
+
+  pe' <- if canSeeCharacter && not (creature ^. creatureGreeted)
+        then yellAtCharacter $> (pe & positioned . creatureGreeted .~ True)
+        else pure pe
+
+  dest <- maybe (selectDestination pos creature) pure
+         . mfilter (\(Destination p _) -> p /= pos)
+         $ creature ^. hippocampus . destination
+  let progress' =
+        dest ^. destinationProgress
+        + creature ^. creatureType . Raw.speed . invertedRate |*| ticks
+  if progress' < 1
+    then pure
+         $ pe'
+         & positioned . hippocampus . destination
+         ?~ (dest & destinationProgress .~ progress')
+    else do
+      let newPos = dest ^. destinationPosition
+          remainingSpeed = progress' - 1
+      newDest <- selectDestination newPos creature
+                <&> destinationProgress +~ remainingSpeed
+      let pe'' = pe' & positioned . hippocampus . destination ?~ newDest
+      collisionAt newPos >>= \case
+        Nothing -> pure $ pe'' & position .~ newPos
+        Just Stop -> pure pe''
+        Just Combat -> do
+          ents <- use $ entities . atPosition newPos
+          when (any (entityIs @Character) ents) attackCharacter
+          pure pe'
+  where
+    vision = visionRadius creature
+    attackCharacter = do
+      dmg <- case creature ^? inventory . wielded . wieldedItems of
+        Just (WieldedItem item wi) -> do
+          let msg = fromMaybe
+                    (Messages.lookup ["combat", "creatureAttack", "genericWeapon"])
+                    $ wi ^. creatureAttackMessage
+          message msg $ object [ "creature" A..= creature
+                               , "item" A..= item
+                               ]
+          pure $ wi ^. Raw.damage
+        Nothing -> do
+          attack <- choose $ creature ^. creatureType . attacks
+          attackDescription <- Messages.render (attack ^. Raw.description)
+                              $ object []
+          say ["combat", "creatureAttack", "natural"]
+              $ object [ "creature" A..= creature
+                       , "attackDescription" A..= attackDescription
+                       ]
+          pure $ attack ^. Raw.damage
+
+      character %= Character.damage dmg
+
+    yellAtCharacter = for_ (creature ^. creatureType . language)
+      $ \lang -> do
+          utterance <- fmap (<> "!") . word $ getLanguage lang
+          creatureSaysText pe utterance
+
+    creatureGreeted :: Lens' entity Bool
+    creatureGreeted = hippocampus . greetedCharacter
+
+
+-- | A creature sends some text
+--
+-- If that creature is visible to the character, its description will be
+-- included, otherwise if it's within earshot the character will just hear the
+-- sound
+creatureSaysText
+  :: (MonadState GameState m, MonadRandom m, IsCreature entity)
+  => Positioned entity
+  -> Text
+  -> m ()
+creatureSaysText ent txt = do
+  let entPos = ent ^. position . _Position . to (fmap fromIntegral)
+  charPos <- use $ characterPosition . _Position . to (fmap fromIntegral)
+  let dist :: Int
+      dist = round $ Metric.distance @_ @Double entPos charPos
+      audible = dist <= fromIntegral hearingRadius
+  when audible $ do
+    visible <- positionIsCharacterVisible $ ent ^. position
+    let path = ["entities", "say", "creature"]
+               <> [if visible then "visible" else "invisible"]
+        params = object [ "creature" A..= (ent ^. positioned)
+                        , "message" A..= txt
+                        ]
+    say path params
+
+newtype GormlakBrain entity = GormlakBrain { _unGormlakBrain :: entity }
+
+instance (IsCreature entity) => Brain (GormlakBrain entity) where
+  step ticks
+    = fmap (fmap GormlakBrain)
+    . stepGormlak ticks
+    . fmap _unGormlakBrain
+  entityCanMove = const True
+
+hippocampus :: HasField "_hippocampus" s t a b => Lens s t a b
+hippocampus = field @"_hippocampus"
+
+creatureType :: HasField "_creatureType" s t a b => Lens s t a b
+creatureType = field @"_creatureType"
+
+inventory :: HasField "_inventory" s t a b => Lens s t a b
+inventory = field @"_inventory"
+
+--------------------------------------------------------------------------------
+
+-- instance Brain Creature where
+--   step = brainVia GormlakBrain
+--   entityCanMove = const True
+
+-- instance Entity Creature where
+--   blocksVision _ = False
+--   description = view $ Creature.creatureType . Raw.description
+--   entityChar = view $ Creature.creatureType . char