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package xyz.driver.core.rest
import akka.http.scaladsl.model._
import akka.http.scaladsl.unmarshalling.{Unmarshal, Unmarshaller}
import akka.stream.Materializer
import scala.concurrent.{ExecutionContext, Future}
import scalaz.{ListT, OptionT}
trait RestService extends Service {
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._
import spray.json._
protected implicit val exec: ExecutionContext
protected implicit val materializer: Materializer
implicit class ResponseEntityFoldable(entity: Unmarshal[ResponseEntity]) {
def fold[T](default: => T)(implicit um: Unmarshaller[ResponseEntity, T]): Future[T] =
if (entity.value.isKnownEmpty()) Future.successful[T](default) else entity.to[T]
}
protected def unitResponse(request: Future[Unmarshal[ResponseEntity]]): OptionT[Future, Unit] =
OptionT[Future, Unit](request.flatMap(_.to[String]).map(_ => Option(())))
protected def optionalResponse[T](request: Future[Unmarshal[ResponseEntity]])(
implicit um: Unmarshaller[ResponseEntity, Option[T]]): OptionT[Future, T] =
OptionT[Future, T](request.flatMap(_.fold(Option.empty[T])))
protected def listResponse[T](request: Future[Unmarshal[ResponseEntity]])(
implicit um: Unmarshaller[ResponseEntity, List[T]]): ListT[Future, T] =
ListT[Future, T](request.flatMap(_.fold(List.empty[T])))
protected def jsonEntity(json: JsValue): RequestEntity =
HttpEntity(ContentTypes.`application/json`, json.compactPrint)
protected def mergePatchJsonEntity(json: JsValue): RequestEntity =
HttpEntity(PatchDirectives.`application/merge-patch+json`, json.compactPrint)
protected def get(baseUri: Uri, path: String, query: Seq[(String, String)] = Seq.empty) =
HttpRequest(HttpMethods.GET, endpointUri(baseUri, path, query))
protected def post(baseUri: Uri, path: String, httpEntity: RequestEntity) =
HttpRequest(HttpMethods.POST, endpointUri(baseUri, path), entity = httpEntity)
protected def postJson(baseUri: Uri, path: String, json: JsValue) =
HttpRequest(HttpMethods.POST, endpointUri(baseUri, path), entity = jsonEntity(json))
protected def put(baseUri: Uri, path: String, httpEntity: RequestEntity) =
HttpRequest(HttpMethods.PUT, endpointUri(baseUri, path), entity = httpEntity)
protected def putJson(baseUri: Uri, path: String, json: JsValue) =
HttpRequest(HttpMethods.PUT, endpointUri(baseUri, path), entity = jsonEntity(json))
protected def patch(baseUri: Uri, path: String, httpEntity: RequestEntity) =
HttpRequest(HttpMethods.PATCH, endpointUri(baseUri, path), entity = httpEntity)
protected def patchJson(baseUri: Uri, path: String, json: JsValue) =
HttpRequest(HttpMethods.PATCH, endpointUri(baseUri, path), entity = jsonEntity(json))
protected def mergePatchJson(baseUri: Uri, path: String, json: JsValue) =
HttpRequest(HttpMethods.PATCH, endpointUri(baseUri, path), entity = mergePatchJsonEntity(json))
protected def delete(baseUri: Uri, path: String, query: Seq[(String, String)] = Seq.empty) =
HttpRequest(HttpMethods.DELETE, endpointUri(baseUri, path, query))
protected def endpointUri(baseUri: Uri, path: String): Uri =
baseUri.withPath(Uri.Path(path))
protected def endpointUri(baseUri: Uri, path: String, query: Seq[(String, String)]): Uri =
baseUri.withPath(Uri.Path(path)).withQuery(Uri.Query(query: _*))
protected def responseToListResponse[T: JsonFormat](pagination: Option[Pagination])(
response: HttpResponse): Future[ListResponse[T]] = {
import DefaultJsonProtocol._
val resourceCount = response.headers
.find(_.name() equalsIgnoreCase ContextHeaders.ResourceCount)
.map(_.value().toInt)
.getOrElse(0)
val meta = ListResponse.Meta(resourceCount, pagination.getOrElse(Pagination(resourceCount max 1, 1)))
Unmarshal(response.entity).to[List[T]].map(ListResponse(_, meta))
}
protected def responseToListResponse[T: JsonFormat](pagination: Pagination)(
response: HttpResponse): Future[ListResponse[T]] = responseToListResponse(Some(pagination))(response)
}
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