{
  lib,
  panelConfigNullable,
  ...
}:
let
  inherit (lib) types mkOption;

  ## The convertor from module options to JSON schema does not generate proper
  ## JSON schema types, forcing us to use nullable fields for default values.
  ## However, working with those fields in the deployment code is annoying (and
  ## unusual for Nix programmers), so we sanitize the input here and add back
  ## the default value by hand.
  nonNull = x: v: if x == null then v else x;
  panelConfig = {
    domain = nonNull panelConfigNullable.domain "fediversity.net";
    initialUser = nonNull panelConfigNullable.initialUser {
      displayName = "Testy McTestface";
      username = "test";
      password = "testtest";
      email = "test@test.com";
    };
    mastodon = nonNull panelConfigNullable.mastodon { enable = false; };
    peertube = nonNull panelConfigNullable.peertube { enable = false; };
    pixelfed = nonNull panelConfigNullable.pixelfed { enable = false; };
  };
in
{
  options = {
    deployment = types.submodule {
      module = mkOption {
        description = ''
          Configuration to be deployed
        '';
        # XXX(@fricklerhandwerk):
        #     misusing this will produce obscure errors that will be truncated by NixOps4
        type = lib.types.submodule ./options.nix;
        default = panelConfig;
      };
      state = mkOption {
        description = ''
          State of the deployment
        '';
        # TODO: TF state
        type = types.deferredModule;
        default = { };
      };
    };
  };
}