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|
{-# LANGUAGE OverloadedStrings #-}
module Test.StarWars.Data
( Character
, StarWarsException(..)
, appearsIn
, artoo
, getDroid
, getDroid'
, getEpisode
, getFriends
, getHero
, getHuman
, id_
, homePlanet
, name_
, secretBackstory
, typeName
) where
import Control.Monad.Catch (Exception(..), MonadThrow(..), SomeException)
import Control.Applicative (Alternative(..), liftA2)
import Data.Maybe (catMaybes)
import Data.Text (Text)
import Data.Typeable (cast)
import Language.GraphQL.Error
import Language.GraphQL.Type
-- * Data
-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsData.js
-- ** Characters
type ID = Text
data CharCommon = CharCommon
{ _id_ :: ID
, _name :: Text
, _friends :: [ID]
, _appearsIn :: [Int]
} deriving (Show)
data Human = Human
{ _humanChar :: CharCommon
, homePlanet :: Text
}
data Droid = Droid
{ _droidChar :: CharCommon
, primaryFunction :: Text
}
type Character = Either Droid Human
id_ :: Character -> ID
id_ (Left x) = _id_ . _droidChar $ x
id_ (Right x) = _id_ . _humanChar $ x
name_ :: Character -> Text
name_ (Left x) = _name . _droidChar $ x
name_ (Right x) = _name . _humanChar $ x
friends :: Character -> [ID]
friends (Left x) = _friends . _droidChar $ x
friends (Right x) = _friends . _humanChar $ x
appearsIn :: Character -> [Int]
appearsIn (Left x) = _appearsIn . _droidChar $ x
appearsIn (Right x) = _appearsIn . _humanChar $ x
data StarWarsException = SecretBackstory | InvalidArguments
instance Show StarWarsException where
show SecretBackstory = "secretBackstory is secret."
show InvalidArguments = "Invalid arguments."
instance Exception StarWarsException where
toException = toException . ResolverException
fromException e = do
ResolverException resolverException <- fromException e
cast resolverException
secretBackstory :: Resolve (Either SomeException)
secretBackstory = throwM SecretBackstory
typeName :: Character -> Text
typeName = either (const "Droid") (const "Human")
luke :: Character
luke = Right luke'
luke' :: Human
luke' = Human
{ _humanChar = CharCommon
{ _id_ = "1000"
, _name = "Luke Skywalker"
, _friends = ["1002","1003","2000","2001"]
, _appearsIn = [4,5,6]
}
, homePlanet = "Tatooine"
}
vader :: Human
vader = Human
{ _humanChar = CharCommon
{ _id_ = "1001"
, _name = "Darth Vader"
, _friends = ["1004"]
, _appearsIn = [4,5,6]
}
, homePlanet = "Tatooine"
}
han :: Human
han = Human
{ _humanChar = CharCommon
{ _id_ = "1002"
, _name = "Han Solo"
, _friends = ["1000","1003","2001" ]
, _appearsIn = [4,5,6]
}
, homePlanet = mempty
}
leia :: Human
leia = Human
{ _humanChar = CharCommon
{ _id_ = "1003"
, _name = "Leia Organa"
, _friends = ["1000","1002","2000","2001"]
, _appearsIn = [4,5,6]
}
, homePlanet = "Alderaan"
}
tarkin :: Human
tarkin = Human
{ _humanChar = CharCommon
{ _id_ = "1004"
, _name = "Wilhuff Tarkin"
, _friends = ["1001"]
, _appearsIn = [4]
}
, homePlanet = mempty
}
threepio :: Droid
threepio = Droid
{ _droidChar = CharCommon
{ _id_ = "2000"
, _name = "C-3PO"
, _friends = ["1000","1002","1003","2001" ]
, _appearsIn = [ 4, 5, 6 ]
}
, primaryFunction = "Protocol"
}
artoo :: Character
artoo = Left artoo'
artoo' :: Droid
artoo' = Droid
{ _droidChar = CharCommon
{ _id_ = "2001"
, _name = "R2-D2"
, _friends = ["1000","1002","1003"]
, _appearsIn = [4,5,6]
}
, primaryFunction = "Astrometch"
}
-- ** Helper functions
getHero :: Int -> Character
getHero 5 = luke
getHero _ = artoo
getHuman :: ID -> Maybe Character
getHuman = fmap Right . getHuman'
getHuman' :: ID -> Maybe Human
getHuman' "1000" = pure luke'
getHuman' "1001" = pure vader
getHuman' "1002" = pure han
getHuman' "1003" = pure leia
getHuman' "1004" = pure tarkin
getHuman' _ = empty
getDroid :: ID -> Maybe Character
getDroid = fmap Left . getDroid'
getDroid' :: ID -> Maybe Droid
getDroid' "2000" = pure threepio
getDroid' "2001" = pure artoo'
getDroid' _ = empty
getFriends :: Character -> [Character]
getFriends char = catMaybes $ liftA2 (<|>) getDroid getHuman <$> friends char
getEpisode :: Int -> Maybe Text
getEpisode 4 = pure "NEW_HOPE"
getEpisode 5 = pure "EMPIRE"
getEpisode 6 = pure "JEDI"
getEpisode _ = empty
|
