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{-# LANGUAGE RoleAnnotations #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE AllowAmbiguousTypes #-}
--------------------------------------------------------------------------------
module Xanthous.Entities
( Draw(..)
, DrawCharacter(..)
, DrawStyledCharacter(..)
, DrawRawChar(..)
, Entity(..)
, SomeEntity(..)
, downcastEntity
, entityIs
, _SomeEntity
, Color(..)
, KnownColor(..)
, EntityChar(..)
, HasChar(..)
, Brain(..)
, Brainless(..)
, brainVia
) where
--------------------------------------------------------------------------------
import Xanthous.Prelude hiding ((.=))
--------------------------------------------------------------------------------
import Brick
import qualified Graphics.Vty.Attributes as Vty
import qualified Graphics.Vty.Image as Vty
import Data.Aeson
import Data.Typeable (Proxy(..))
import Data.Generics.Product.Fields
import Test.QuickCheck
import Test.QuickCheck.Arbitrary.Generic
--------------------------------------------------------------------------------
import Xanthous.Orphans ()
import Xanthous.Game.State
--------------------------------------------------------------------------------
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
newtype DrawStyledCharacter (fg :: Color) (bg :: Color) (char :: Symbol) (a :: Type) where
DrawStyledCharacter :: a -> DrawStyledCharacter fg bg char a
instance
( KnownColor fg
, KnownColor 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 = Vty.SetTo $ colorVal @fg Proxy
, Vty.attrBackColor = Vty.SetTo $ colorVal @bg Proxy
, Vty.attrURL = Vty.Default
}
--------------------------------------------------------------------------------
class HasChar s a | s -> a where
char :: Lens' s a
{-# MINIMAL char #-}
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
--------------------------------------------------------------------------------
data EntityChar = EntityChar
{ _char :: Char
, _style :: Vty.Attr
}
deriving stock (Show, Eq, Generic)
deriving anyclass (NFData, CoArbitrary, Function)
instance Arbitrary EntityChar where
arbitrary = genericArbitrary
instance FromJSON EntityChar where
parseJSON (String (chr :< Empty)) = pure $ EntityChar chr Vty.defAttr
parseJSON (Object o) = do
(EntityChar _char _) <- o .: "char"
_style <- o .:? "style" >>= \case
Just styleO -> do
let attrStyle = Vty.Default -- TODO
attrURL = Vty.Default
attrForeColor <- styleO .:? "foreground" .!= Vty.Default
attrBackColor <- styleO .:? "background" .!= Vty.Default
pure Vty.Attr {..}
Nothing -> pure Vty.defAttr
pure EntityChar {..}
parseJSON _ = fail "Invalid type, expected string or object"
instance ToJSON EntityChar where
toJSON (EntityChar chr styl)
| styl == Vty.defAttr = String $ chr <| Empty
| otherwise = object
[ "char" .= chr
, "style" .= object
[ "foreground" .= Vty.attrForeColor styl
, "background" .= Vty.attrBackColor styl
]
]
instance Draw EntityChar where
draw EntityChar{..} = raw $ Vty.string _style [_char]
|
