self: {
  config,
  lib,
  pkgs,
  ...
}: let
  cfg = config.services.dyn-gandi;
  inherit (lib) mkIf mkEnableOption mkOption types;
in {
  options.services.dyn-gandi = {
    enable = mkEnableOption "dyn-gandi";

    timer = lib.mkOption {
      type = lib.types.int;
      default = 0;
      description = lib.mdDoc ''
        The time intervall in seconds the script should be repeated.
        0 disables automatic starts.
      '';
    };

    settings = mkOption {
      type = with types; let
        valueType = nullOr (oneOf [
          bool
          int
          float
          str
          path
          (attrsOf valueType)
          (listOf valueType)
        ]);
      in
        valueType;

      default = {api = {"example.com" = ["@" "www"];};};
      example = {
        General = {
          disabledTrayIcon = true;
          showStartupLaunchMessage = false;
        };
      };
      description = '''';
    };
  };

  config = mkIf cfg.enable {
    home.packages = [self.packages.x86_64-linux.default];

    xdg.configFile."dyn-gandi/config.json" = {
      text = builtins.toJSON cfg.settings;
    };

    systemd.user.services.dyn-gandi =
      mkIf cfg.timer
      != 0 {
        Unit = {
          Description = "DNS Updater tool for Gandi.net";
          After = ["graphical-session-pre.target"];
          PartOf = ["graphical-session.target"];
        };
      };
    systemd.user.timers.dyn-gandi = {
      wantedBy = ["timers.target"];
      timerConfig = {
        OnBootSec = "0s";
        OnUnitActiveSec = "${cfg.timer}s";
        Unit = "dyn-gandi.service";
      };
    };
  };
}