{
  config,
  pkgs,
  outputs,
  ...
}: {
  imports = [
    # Include the results of the hardware scan.
    ./hardware-configuration.nix
    ../common/users/produktion
    ../common/base
  ];

  # Bootloader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  boot.loader.efi.efiSysMountPoint = "/boot/efi";

  #  networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
  networking = {
    hostName = "lkk-prod-2";
    networkmanager.enable = true;
    firewall.enable = true;
  };
  programs.fish.enable = true;
  age = {
    secrets = {tailscale-key.file = ../../secrets/tailscale-key.age;};
    identityPaths = ["/root/.ssh/lkk-nix-1"];
  };
  services.openssh = {
    enable = true;
    settings.PermitRootLogin = "yes";
  };
  services.avahi.nssmdns4 = {
    enable = true;
    nssmdns = true;
  };
  services.tailscale = {
    enable = true;
    useRoutingFeatures = "client";
  };
  systemd.services.tailscale-autoconnect = {
    description = "Automatic connection to Tailscale";

    # make sure tailscale is running before trying to connect to tailscale
    after = ["network-pre.target" "tailscale.service"];
    wants = ["network-pre.target" "tailscale.service"];
    wantedBy = ["multi-user.target"];

    # set this service as a oneshot job
    serviceConfig = {
      Type = "oneshot";
      EnvironmentFile = "${config.age.secrets.tailscale-key.path}";
    };

    # have the job run this shell script
    script = with pkgs; ''
      # wait for tailscaled to settle
      sleep 2

      # check if we are already authenticated to tailscale
      status="$(${tailscale}/bin/tailscale status -json | ${jq}/bin/jq -r .BackendState)"
      if [ $status = "Running" ]; then # if so, then do nothing
        exit 0
      fi

      # otherwise authenticate with tailscale
      ${tailscale}/bin/tailscale up --authkey $TAILSCALE_KEY
    '';
  };
  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Set your time zone.
  time.timeZone = "Europe/Berlin";

  # Select internationalisation properties.
  i18n.defaultLocale = "de_DE.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "de_DE.UTF-8";
    LC_IDENTIFICATION = "de_DE.UTF-8";
    LC_MEASUREMENT = "de_DE.UTF-8";
    LC_MONETARY = "de_DE.UTF-8";
    LC_NAME = "de_DE.UTF-8";
    LC_NUMERIC = "de_DE.UTF-8";
    LC_PAPER = "de_DE.UTF-8";
    LC_TELEPHONE = "de_DE.UTF-8";
    LC_TIME = "de_DE.UTF-8";
  };

  # Enable the X11 windowing system.
  services.xserver.enable = true;

  # Enable the KDE Plasma Desktop Environment.
  services.xserver.displayManager.sddm.enable = true;
  services.xserver.desktopManager.plasma5.enable = true;

  # Configure keymap in X11
  services.xserver = {xkb.layout = "de";};

  # Configure console keymap
  console.keyMap = "de";

  # Enable CUPS to print documents.
  services.printing.enable = true;

  # Enable sound with pipewire.
  sound.enable = true;
  hardware.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    # If you want to use JACK applications, uncomment this
    #jack.enable = true;

    # use the example session manager (no others are packaged yet so this is enabled by default,
    # no need to redefine it in your config for now)
    #media-session.enable = true;
  };

  # Enable touchpad support (enabled default in most desktopManager).
  # services.xserver.libinput.enable = true;

  nixpkgs = {
    overlays = [
      outputs.overlays.additions
      outputs.overlays.modifications
      outputs.overlays.stable-packages
    ];
    config = {allowUnfree = true;};
  };

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [neovim];

  nix = {
    gc = {
      automatic = true;
      options = "--delete-older-than 30d";
    };
    optimise.automatic = true;
  };

  system.stateVersion = "22.11"; # Did you read the comment?
  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };

  # List services that you want to enable:

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
}