(* TODO response
   use ErrorDetail *)

let respond_with_plain_text_error ?status e req =
  let open Vif.Response in
  let open Syntax in
  let status = Option.value ~default:`Bad_request status in
  let* () = add ~field:"content-type" "text/plain; charset=utf-8" in
  let* () = with_string req e in
  respond status

let respond_with_ok_json content req =
  let open Vif.Response in
  let open Syntax in
  let* () = add ~field:"content-type" "application/json" in
  let* () = with_string req content in
  respond `OK

let respond_with_res res req =
  match res with
  | Error err ->
      Logs.err (fun m -> m "%s." err);
      let err = Fmt.str "%s@." err in
      respond_with_plain_text_error err req
  | Ok content -> respond_with_ok_json content req