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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Test.StarWars.Schema
( schema
) where
import Control.Monad.Trans.Reader (asks)
import Control.Monad.Trans.Except (throwE)
import Control.Monad.Trans.Class (lift)
import Data.Functor.Identity (Identity)
import qualified Data.HashMap.Strict as HashMap
import Data.Maybe (catMaybes)
import Data.Text (Text)
import Language.GraphQL.Trans
import Language.GraphQL.Type.Definition
import qualified Language.GraphQL.Type.In as In
import qualified Language.GraphQL.Type.Out as Out
import Language.GraphQL.Type.Schema (Schema(..))
import Test.StarWars.Data
import Prelude hiding (id)
-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
schema :: Schema Identity
schema = Schema { query = queryType, mutation = Nothing }
where
queryType = Out.ObjectType "Query" Nothing [] $ HashMap.fromList
[ ("hero", Out.Resolver heroField hero)
, ("human", Out.Resolver humanField human)
, ("droid", Out.Resolver droidField droid)
]
heroField = Out.Field Nothing (Out.NamedObjectType heroObject)
$ HashMap.singleton "episode"
$ In.Argument Nothing (In.NamedEnumType episodeEnum) Nothing
humanField = Out.Field Nothing (Out.NamedObjectType heroObject)
$ HashMap.singleton "id"
$ In.Argument Nothing (In.NonNullScalarType string) Nothing
droidField = Out.Field Nothing (Out.NamedObjectType droidObject) mempty
heroObject :: Out.ObjectType Identity
heroObject = Out.ObjectType "Human" Nothing [] $ HashMap.fromList
[ ("id", Out.Resolver idFieldType (idField "id"))
, ("name", Out.Resolver nameFieldType (idField "name"))
, ("friends", Out.Resolver friendsFieldType (idField "friends"))
, ("appearsIn", Out.Resolver appearsInFieldType (idField "appearsIn"))
, ("homePlanet", Out.Resolver homePlanetFieldType (idField "homePlanet"))
, ("secretBackstory", Out.Resolver secretBackstoryFieldType (String <$> secretBackstory))
, ("__typename", Out.Resolver (Out.Field Nothing (Out.NamedScalarType string) mempty) (idField "__typename"))
]
where
homePlanetFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
droidObject :: Out.ObjectType Identity
droidObject = Out.ObjectType "Droid" Nothing [] $ HashMap.fromList
[ ("id", Out.Resolver idFieldType (idField "id"))
, ("name", Out.Resolver nameFieldType (idField "name"))
, ("friends", Out.Resolver friendsFieldType (idField "friends"))
, ("appearsIn", Out.Resolver appearsInFieldType (idField "appearsIn"))
, ("primaryFunction", Out.Resolver primaryFunctionFieldType (idField "primaryFunction"))
, ("secretBackstory", Out.Resolver secretBackstoryFieldType (String <$> secretBackstory))
, ("__typename", Out.Resolver (Out.Field Nothing (Out.NamedScalarType string) mempty) (idField "__typename"))
]
where
primaryFunctionFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
idFieldType :: Out.Field Identity
idFieldType = Out.Field Nothing (Out.NamedScalarType id) mempty
nameFieldType :: Out.Field Identity
nameFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
friendsFieldType :: Out.Field Identity
friendsFieldType = Out.Field Nothing (Out.ListType $ Out.NamedObjectType droidObject) mempty
appearsInFieldType :: Out.Field Identity
appearsInFieldType = Out.Field Nothing (Out.ListType $ Out.NamedScalarType int) mempty
secretBackstoryFieldType :: Out.Field Identity
secretBackstoryFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
idField :: Text -> ActionT Identity Value
idField f = do
v <- ActionT $ lift $ asks values
let (Object v') = v
pure $ v' HashMap.! f
episodeEnum :: EnumType
episodeEnum = EnumType "Episode" (Just description)
$ HashMap.fromList [newHope, empire, jedi]
where
description = "One of the films in the Star Wars Trilogy"
newHope = ("NEW_HOPE", EnumValue $ Just "Released in 1977.")
empire = ("EMPIRE", EnumValue $ Just "Released in 1980.")
jedi = ("JEDI", EnumValue $ Just "Released in 1983.")
hero :: ActionT Identity Value
hero = do
episode <- argument "episode"
pure $ character $ case episode of
Enum "NEWHOPE" -> getHero 4
Enum "EMPIRE" -> getHero 5
Enum "JEDI" -> getHero 6
_ -> artoo
human :: ActionT Identity Value
human = do
id' <- argument "id"
case id' of
String i -> do
humanCharacter <- lift $ return $ getHuman i >>= Just
case humanCharacter of
Nothing -> pure Null
Just e -> pure $ character e
_ -> ActionT $ throwE "Invalid arguments."
droid :: ActionT Identity Value
droid = do
id' <- argument "id"
case id' of
String i -> character <$> getDroid i
_ -> ActionT $ throwE "Invalid arguments."
character :: Character -> Value
character char = Object $ HashMap.fromList
[ ("id", String $ id_ char)
, ("name", String $ name_ char)
, ("friends", List $ character <$> getFriends char)
, ("appearsIn", List $ Enum <$> catMaybes (getEpisode <$> appearsIn char))
, ("homePlanet", String $ either mempty homePlanet char)
, ("__typename", String $ typeName char)
]
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