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diff --git a/users/grfn/xanthous/src/Xanthous/Entities/Common.hs b/users/grfn/xanthous/src/Xanthous/Entities/Common.hs new file mode 100644 index 000000000000..368b03f25bed --- /dev/null +++ b/users/grfn/xanthous/src/Xanthous/Entities/Common.hs @@ -0,0 +1,290 @@ +{-# LANGUAGE TemplateHaskell #-} +-------------------------------------------------------------------------------- +-- | +-- Module : Xanthous.Entities.Common +-- Description : Common data type definitions and utilities for entities +-- +-------------------------------------------------------------------------------- +module Xanthous.Entities.Common + ( -- * Inventory + Inventory(..) + , HasInventory(..) + , backpack + , wielded + , items + , InventoryPosition(..) + , describeInventoryPosition + , inventoryPosition + , itemsWithPosition + , removeItemFromPosition + + -- ** Wielded items + , Wielded(..) + , nothingWielded + , hands + , leftHand + , rightHand + , inLeftHand + , inRightHand + , doubleHanded + , Hand(..) + , itemsInHand + , inHand + , wieldInHand + , describeHand + , wieldedItems + , WieldedItem(..) + , wieldedItem + , wieldableItem + , asWieldedItem + ) where +-------------------------------------------------------------------------------- +import Xanthous.Prelude +-------------------------------------------------------------------------------- +import Data.Aeson (ToJSON, FromJSON) +import Data.Aeson.Generic.DerivingVia +import Test.QuickCheck +import Test.QuickCheck.Checkers (EqProp) +-------------------------------------------------------------------------------- +import Xanthous.Data (Positioned(..), positioned) +import Xanthous.Util.QuickCheck +import Xanthous.Game.State +import Xanthous.Entities.Item +import Xanthous.Entities.RawTypes (WieldableItem, wieldable) +import Xanthous.Util (removeFirst, EqEqProp(..)) +-------------------------------------------------------------------------------- + +data WieldedItem = WieldedItem + { _wieldedItem :: Item + , _wieldableItem :: WieldableItem + -- ^ Invariant: item ^. itemType . wieldable ≡ Just wieldableItem + } + deriving stock (Eq, Show, Ord, Generic) + deriving anyclass (NFData, CoArbitrary, Function) + deriving (ToJSON, FromJSON) + via WithOptions '[ FieldLabelModifier '[Drop 1] ] + WieldedItem +makeFieldsNoPrefix ''WieldedItem + +asWieldedItem :: Prism' Item WieldedItem +asWieldedItem = prism' hither yon + where + yon item = WieldedItem item <$> item ^. itemType . wieldable + hither (WieldedItem item _) = item + +instance Brain WieldedItem where + step ticks (Positioned p wi) = + over positioned (\i -> WieldedItem i $ wi ^. wieldableItem) + <$> step ticks (Positioned p $ wi ^. wieldedItem) + +instance Draw WieldedItem where + draw = draw . view wieldedItem + +instance Entity WieldedItem where + entityAttributes = entityAttributes . view wieldedItem + description = description . view wieldedItem + entityChar = entityChar . view wieldedItem + +instance Arbitrary WieldedItem where + arbitrary = genericArbitrary <&> \wi -> + wi & wieldedItem . itemType . wieldable ?~ wi ^. wieldableItem + +data Wielded + = DoubleHanded WieldedItem + | Hands { _leftHand :: !(Maybe WieldedItem) + , _rightHand :: !(Maybe WieldedItem) + } + deriving stock (Eq, Show, Ord, Generic) + deriving anyclass (NFData, CoArbitrary, Function) + deriving Arbitrary via GenericArbitrary Wielded + deriving (ToJSON, FromJSON) + via WithOptions '[ 'SumEnc 'ObjWithSingleField ] + Wielded + + +nothingWielded :: Wielded +nothingWielded = Hands Nothing Nothing + +hands :: Prism' Wielded (Maybe WieldedItem, Maybe WieldedItem) +hands = prism' (uncurry Hands) $ \case + Hands l r -> Just (l, r) + _ -> Nothing + +leftHand :: Traversal' Wielded (Maybe WieldedItem) +leftHand = hands . _1 + +inLeftHand :: WieldedItem -> Wielded +inLeftHand wi = Hands (Just wi) Nothing + +rightHand :: Traversal' Wielded (Maybe WieldedItem) +rightHand = hands . _2 + +inRightHand :: WieldedItem -> Wielded +inRightHand wi = Hands Nothing (Just wi) + +doubleHanded :: Prism' Wielded WieldedItem +doubleHanded = prism' DoubleHanded $ \case + DoubleHanded i -> Just i + _ -> Nothing + +wieldedItems :: Traversal' Wielded WieldedItem +wieldedItems k (DoubleHanded wielded) = DoubleHanded <$> k wielded +wieldedItems k (Hands l r) = Hands <$> _Just k l <*> _Just k r + + +data Hand + = LeftHand + | RightHand + | BothHands + deriving stock (Eq, Show, Ord, Generic) + deriving anyclass (NFData, CoArbitrary, Function) + deriving Arbitrary via GenericArbitrary Hand + +itemsInHand :: Hand -> Wielded -> [WieldedItem] +itemsInHand LeftHand (DoubleHanded wi) = [wi] +itemsInHand LeftHand (Hands lh _) = toList lh +itemsInHand RightHand (DoubleHanded wi) = [wi] +itemsInHand RightHand (Hands _ rh) = toList rh +itemsInHand BothHands (DoubleHanded wi) = [wi] +itemsInHand BothHands (Hands lh rh) = toList lh <> toList rh + +inHand :: Hand -> WieldedItem -> Wielded +inHand LeftHand = inLeftHand +inHand RightHand = inRightHand +inHand BothHands = review doubleHanded + +wieldInHand :: Hand -> WieldedItem -> Wielded -> ([WieldedItem], Wielded) +wieldInHand hand item w = (itemsInHand hand w, doWield) + where + doWield = case (hand, w) of + (LeftHand, Hands _ r) -> Hands (Just item) r + (LeftHand, DoubleHanded _) -> inLeftHand item + (RightHand, Hands l _) -> Hands l (Just item) + (RightHand, DoubleHanded _) -> inRightHand item + (BothHands, _) -> DoubleHanded item + +describeHand :: Hand -> Text +describeHand LeftHand = "your left hand" +describeHand RightHand = "your right hand" +describeHand BothHands = "both hands" + +data Inventory = Inventory + { _backpack :: Vector Item + , _wielded :: Wielded + } + deriving stock (Eq, Show, Ord, Generic) + deriving anyclass (NFData, CoArbitrary, Function) + deriving Arbitrary via GenericArbitrary Inventory + deriving EqProp via EqEqProp Inventory + deriving (ToJSON, FromJSON) + via WithOptions '[ FieldLabelModifier '[Drop 1] ] + Inventory +makeFieldsNoPrefix ''Inventory + +items :: Traversal' Inventory Item +items k (Inventory bp w) = Inventory + <$> traversed k bp + <*> (wieldedItems . wieldedItem) k w + +type instance Element Inventory = Item + +instance MonoFunctor Inventory where + omap = over items + +instance MonoFoldable Inventory where + ofoldMap = foldMapOf items + ofoldr = foldrOf items + ofoldl' = foldlOf' items + otoList = toListOf items + oall = allOf items + oany = anyOf items + onull = nullOf items + ofoldr1Ex = foldr1Of items + ofoldl1Ex' = foldl1Of' items + headEx = headEx . toListOf items + lastEx = lastEx . toListOf items + +instance MonoTraversable Inventory where + otraverse = traverseOf items + +instance Semigroup Inventory where + inv₁ <> inv₂ = + let backpack' = inv₁ ^. backpack <> inv₂ ^. backpack + (wielded', backpack'') = case (inv₁ ^. wielded, inv₂ ^. wielded) of + (wielded₁, wielded₂@(DoubleHanded _)) -> + (wielded₂, backpack' <> fromList (wielded₁ ^.. wieldedItems . wieldedItem)) + (wielded₁, wielded₂@(Hands (Just _) (Just _))) -> + (wielded₂, backpack' <> fromList (wielded₁ ^.. wieldedItems . wieldedItem)) + (wielded₁, Hands Nothing Nothing) -> (wielded₁, backpack') + (Hands Nothing Nothing, wielded₂) -> (wielded₂, backpack') + (Hands (Just l₁) Nothing, Hands Nothing (Just r₂)) -> + (Hands (Just l₁) (Just r₂), backpack') + (wielded₁@(DoubleHanded _), wielded₂) -> + (wielded₁, backpack' <> fromList (wielded₂ ^.. wieldedItems . wieldedItem)) + (Hands Nothing (Just r₁), Hands Nothing (Just r₂)) -> + (Hands Nothing (Just r₂), r₁ ^. wieldedItem <| backpack') + (Hands Nothing r₁, Hands (Just l₂) Nothing) -> + (Hands (Just l₂) r₁, backpack') + (Hands (Just l₁) Nothing, Hands (Just l₂) Nothing) -> + (Hands (Just l₂) Nothing, l₁ ^. wieldedItem <| backpack') + (Hands (Just l₁) (Just r₁), Hands Nothing (Just r₂)) -> + (Hands (Just l₁) (Just r₂), r₁ ^. wieldedItem <| backpack') + (Hands (Just l₁) (Just r₁), Hands (Just l₂) Nothing) -> + (Hands (Just l₂) (Just r₁), l₁ ^. wieldedItem <| backpack') + in Inventory backpack'' wielded' + +instance Monoid Inventory where + mempty = Inventory mempty $ Hands Nothing Nothing + +class HasInventory s a | s -> a where + inventory :: Lens' s a + {-# MINIMAL inventory #-} + +-- | Representation for where in the inventory an item might be +data InventoryPosition + = Backpack + | InHand Hand + deriving stock (Eq, Show, Ord, Generic) + deriving anyclass (NFData, CoArbitrary, Function) + deriving Arbitrary via GenericArbitrary InventoryPosition + +-- | Return a human-readable description of the given 'InventoryPosition' +describeInventoryPosition :: InventoryPosition -> Text +describeInventoryPosition Backpack = "In backpack" +describeInventoryPosition (InHand hand) = "Wielded, in " <> describeHand hand + +-- | Given a position in the inventory, return a traversal on the inventory over +-- all the items in that position +inventoryPosition :: InventoryPosition -> Traversal' Inventory Item +inventoryPosition Backpack = backpack . traversed +inventoryPosition (InHand LeftHand) = wielded . leftHand . _Just . wieldedItem +inventoryPosition (InHand RightHand) = wielded . leftHand . _Just . wieldedItem +inventoryPosition (InHand BothHands) = wielded . doubleHanded . wieldedItem + +-- | A fold over all the items in the inventory accompanied by their position in +-- the inventory +-- +-- Invariant: This will return items in the same order as 'items' +itemsWithPosition :: Fold Inventory (InventoryPosition, Item) +itemsWithPosition = folding $ (<>) <$> backpackItems <*> handItems + where + backpackItems = toListOf $ backpack . folded . to (Backpack ,) + handItems inv = case inv ^. wielded of + DoubleHanded i -> pure (InHand BothHands, i ^. wieldedItem) + Hands l r -> (l ^.. folded . wieldedItem . to (InHand LeftHand ,)) + <> (r ^.. folded . wieldedItem . to (InHand RightHand ,)) + +-- | Remove the first item equal to 'Item' from the given position in the +-- inventory +removeItemFromPosition :: InventoryPosition -> Item -> Inventory -> Inventory +removeItemFromPosition Backpack item inv + = inv & backpack %~ removeFirst (== item) +removeItemFromPosition (InHand LeftHand) item inv + = inv & wielded . leftHand %~ filter ((/= item) . view wieldedItem) +removeItemFromPosition (InHand RightHand) item inv + = inv & wielded . rightHand %~ filter ((/= item) . view wieldedItem) +removeItemFromPosition (InHand BothHands) item inv + | has (wielded . doubleHanded . wieldedItem . filtered (== item)) inv + = inv & wielded .~ nothingWielded + | otherwise + = inv |