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{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
module Test.StarWars.Schema where
import Control.Applicative (Alternative, empty)
import Data.List.NonEmpty (NonEmpty((:|)))
import Data.GraphQL.Schema (Schema, Resolver, Argument(..), Value(..))
import qualified Data.GraphQL.Schema as Schema
import Test.StarWars.Data
-- * Schema
-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
schema :: Alternative f => Schema f
schema = hero :| [human, droid]
hero :: Alternative f => Resolver f
hero = Schema.objectA "hero" $ \case
[] -> character artoo
[Argument "episode" (ValueInt n)] -> character . getHero $ fromIntegral n
[Argument "episode" (ValueEnum "NEWHOPE")] -> character $ getHero 4
[Argument "episode" (ValueEnum "EMPIRE" )] -> character $ getHero 5
[Argument "episode" (ValueEnum "JEDI" )] -> character $ getHero 6
_ -> empty
human :: Alternative f => Resolver f
human = Schema.objectA "human" $ \case
[Argument "id" (ValueString i)] -> character =<< getHuman i
_ -> empty
droid :: Alternative f => Resolver f
droid = Schema.objectA "droid" $ \case
[Argument "id" (ValueString i)] -> character =<< getDroid i
_ -> empty
character :: Alternative f => Character -> [Resolver f]
character char =
[ Schema.scalar "id" $ id_ char
, Schema.scalar "name" $ name char
, Schema.array "friends" $ character <$> getFriends char
, Schema.enum "appearsIn" . traverse getEpisode $ appearsIn char
, Schema.scalar "secretBackstory" $ secretBackstory char
, Schema.scalar "homePlanet" $ either mempty homePlanet char
, Schema.scalar "__typename" $ typeName char
]
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