{
  config,
  lib,
  pkgs,
  ...
}:

{

  options.zpha.services.wlsunset.enable = lib.mkEnableOption "batsignal";

  config = lib.mkIf config.zpha.services.wlsunset.enable {
    users.users.zaphyra.maid = {
      systemd.services.batsignal = {
        description = "Day/night gamma adjustments for Wayland compositors.";
        after = [ "niri-session.target" ];
        partOf = [ "niri-session.target" ];
        wantedBy = [ "niri-session.target" ];

        unitConfig.ConditionEnvironment = "WAYLAND_DISPLAY";

        serviceConfig = {
          Restart = "on-failure";
          ExecStart =
            let
              args = lib.cli.toCommandLineShellGNU { } {
                t = 3000;
                T = 4500;
                l = "8.26";
                L = "49.01";
              };
            in
            "${lib.getExe pkgs.wlsunset} ${args}";
        };
      };
    };
  };

}