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{
  config,
  lib,
  pkgs,
  ...
}:
let
  cfg = config.services.ugit;
  settingsFormat = pkgs.formats.json { };
  name = "myapp";
  configFile = settingsFormat.generate "${name}.json" (
    lib.filterAttrsRecursive (_: v: v != null) cfg.settings
  );
in
{
  options.services.${name} = {
    enable = lib.mkEnableOption name;

    package = lib.mkOption {
      type = lib.types.package;
      description = "The ${name} package to use.";
    };

    settings = lib.mkOption {
      type = lib.types.submodule {
        # Pass one argument per @nix(import) name used by the schema.
        options = import ./options.nix {
          inherit lib;
          profileLink = import ./profile-link.nix { inherit lib; };
        };
      };
      default = { };
      description = "${name} configuration, rendered to JSON and passed via --config.";
    };
  };

  config = lib.mkIf cfg.enable {
    systemd.services.${name} = {
      wantedBy = [ "multi-user.target" ];
      after = [ "network.target" ];
      serviceConfig = {
        ExecStart = "${cfg.package}/bin/${name} --config ${configFile}";
        DynamicUser = true;
        StateDirectory = name;
        WorkingDirectory = "/var/lib/${name}";
      };
    };
  };
}