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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.Type
import qualified Language.GraphQL.Type.In as In
import qualified Language.GraphQL.Type.Out as Out
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", heroFieldResolver)
, ("human", humanFieldResolver)
, ("droid", droidFieldResolver)
]
heroField = Out.Field Nothing (Out.NamedObjectType heroObject)
$ HashMap.singleton "episode"
$ In.Argument Nothing (In.NamedEnumType episodeEnum) Nothing
heroFieldResolver = ValueResolver heroField hero
humanField = Out.Field Nothing (Out.NamedObjectType heroObject)
$ HashMap.singleton "id"
$ In.Argument Nothing (In.NonNullScalarType string) Nothing
humanFieldResolver = ValueResolver humanField human
droidField = Out.Field Nothing (Out.NamedObjectType droidObject) mempty
droidFieldResolver = ValueResolver droidField droid
heroObject :: Out.ObjectType Identity
heroObject = Out.ObjectType "Human" Nothing [] $ HashMap.fromList
[ ("id", idFieldType)
, ("name", nameFieldType)
, ("friends", friendsFieldType)
, ("appearsIn", appearsInField)
, ("homePlanet", homePlanetFieldType)
, ("secretBackstory", secretBackstoryFieldType)
, ("__typename", typenameFieldType)
]
where
homePlanetFieldType
= ValueResolver (Out.Field Nothing (Out.NamedScalarType string) mempty)
$ idField "homePlanet"
droidObject :: Out.ObjectType Identity
droidObject = Out.ObjectType "Droid" Nothing [] $ HashMap.fromList
[ ("id", idFieldType)
, ("name", nameFieldType)
, ("friends", friendsFieldType)
, ("appearsIn", appearsInField)
, ("primaryFunction", primaryFunctionFieldType)
, ("secretBackstory", secretBackstoryFieldType)
, ("__typename", typenameFieldType)
]
where
primaryFunctionFieldType
= ValueResolver (Out.Field Nothing (Out.NamedScalarType string) mempty)
$ idField "primaryFunction"
typenameFieldType :: Resolver Identity
typenameFieldType
= ValueResolver (Out.Field Nothing (Out.NamedScalarType string) mempty)
$ idField "__typename"
idFieldType :: Resolver Identity
idFieldType
= ValueResolver (Out.Field Nothing (Out.NamedScalarType id) mempty)
$ idField "id"
nameFieldType :: Resolver Identity
nameFieldType
= ValueResolver (Out.Field Nothing (Out.NamedScalarType string) mempty)
$ idField "name"
friendsFieldType :: Resolver Identity
friendsFieldType
= ValueResolver (Out.Field Nothing fieldType mempty)
$ idField "friends"
where
fieldType = Out.ListType $ Out.NamedObjectType droidObject
appearsInField :: Resolver Identity
appearsInField
= ValueResolver (Out.Field (Just description) fieldType mempty)
$ idField "appearsIn"
where
fieldType = Out.ListType $ Out.NamedEnumType episodeEnum
description = "Which movies they appear in."
secretBackstoryFieldType :: Resolver Identity
secretBackstoryFieldType = ValueResolver field secretBackstory
where
field = Out.Field Nothing (Out.NamedScalarType string) mempty
idField :: Text -> Resolve Identity
idField f = do
v <- 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 :: Resolve Identity
hero = do
episode <- argument "episode"
pure $ character $ case episode of
Enum "NEW_HOPE" -> getHero 4
Enum "EMPIRE" -> getHero 5
Enum "JEDI" -> getHero 6
_ -> artoo
human :: Resolve Identity
human = do
id' <- argument "id"
case id' of
String i -> pure $ maybe Null character $ getHuman i >>= Just
_ -> throwE "Invalid arguments."
droid :: Resolve Identity
droid = do
id' <- argument "id"
case id' of
String i -> pure $ maybe Null character $ getDroid i >>= Just
_ -> 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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