import akka.actor.ActorSystem
  import akka.http.scaladsl.Http
  import akka.stream.ActorMaterializer
  import com.sebruck.akka.http.graphql.GraphEndpoint
  import sangria.execution.deferred.DeferredResolver
  import sangria.schema._

  import scala.concurrent.ExecutionContextExecutor
  import scala.util.{Failure, Success}

  implicit val actorSystem: ActorSystem     = ActorSystem()
  implicit val mat: ActorMaterializer       = ActorMaterializer()
  implicit val ec: ExecutionContextExecutor = actorSystem.dispatcher

  // Define Schema
  val Query = ObjectType(
    "Query",
    fields[Unit, Unit](
      Field("test", StringType, resolve = _ => "Hello!")
    )
  )

  val MySchema = Schema(Query)

  // Initialise Akka Http Endpoint
  val endpoint = GraphEndpoint(schema = MySchema,
                               context = (),
                               deferredResolver = DeferredResolver.empty,
                               graphQLPath = "graphql",
                               graphQLPlaygroundResourcePath = Some("playground.html"))

  // Start server
  Http().bindAndHandle(endpoint.route, "127.0.0.1", 8080).onComplete {
    case Success(binding) =>
      println(s"Bound to $binding")
    case Failure(exception) => throw exception
  }