{ lib, pkgs, ... }: {
  imports = [
    ./fleet.nix
    ./utils/bento.nix
    ./utils/modules/sops.nix
    ./utils/modules/lego/lego.nix

    ./utils/modules/nginx.nix

    ./utils/modules/autoupgrade.nix
    ./utils/modules/promtail
    ./utils/modules/borgbackup.nix
    # ./utils/modules/netdata.nix

    # fw
    ./modules/networking.nix
    ./modules/firewall.nix
    ./modules/dhcp4.nix
    ./modules/unbound.nix
    ./modules/avahi.nix
    ./modules/openconnect.nix
    ./modules/wireguard.nix
    ./modules/podman.nix
    ./modules/omada.nix
    ./modules/ddclient.nix
    # ./modules/wol.nix

    # microvm
    ./modules/microvm.nix
    ./modules/gitea-vm.nix

    # web
    ./modules/web

    # git
    ./modules/gitea.nix
    ./modules/fwmetrics.nix

    # ./modules/firefox-sync.nix
    
    # home assistant
    ./modules/home-assistant
    ./modules/deconz.nix
    # ./modules/mopidy.nix
    # ./modules/mosquitto.nix
    ./modules/snapserver.nix

    # gaming
    ./modules/palworld.nix
    # ./modules/ark-survival-evolved.nix


    ./hardware-configuration.nix
  ];

  nixpkgs.overlays = [
    (import ./utils/overlays/packages.nix)
  ];

  nixpkgs.config.permittedInsecurePackages = [
    "openssl-1.1.1w"
  ];

  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
    "mongodb"
  ];

  time.timeZone = "Europe/Vienna";

  services.logind.extraConfig = "RuntimeDirectorySize=2G";

  sops.age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
  sops.defaultSopsFile = ./secrets.yaml;
  
  environment.systemPackages = with pkgs; [
    bento
    conntrack-tools     # view network connection states
    ethtool             # manage NIC settings (offload, NIC feeatures, ...)
    git
    htop                # to see the system load
    tcpdump             # view network traffic
    vim                 # my preferred editor
    wol
    inotify-tools
  ];

  nix.gc = {
    automatic = true;
    options = "--delete-older-than 60d";
  };

  services.auto-cpufreq.enable = true;
  services.auto-cpufreq.settings = {
    charger = {
       governor = "powersave";
       turbo = "auto";
    };
  };

  boot = {
    kernelPackages = pkgs.linuxPackagesFor (pkgs.callPackage ./pkgs/kernel/vendor.nix {});

    # kernelParams copy from Armbian's /boot/armbianEnv.txt & /boot/boot.cmd
    kernelParams = [
      "rootwait"

      "earlycon" # enable early console, so we can see the boot messages via serial port / HDMI
      "consoleblank=0" # disable console blanking(screen saver)
      "console=ttyS2,1500000" # serial port
      "console=tty1" # HDMI

      # docker optimizations
      "cgroup_enable=cpuset"
      "cgroup_memory=1"
      "cgroup_enable=memory"
      "swapaccount=1"
    ];
  };

  boot.tmp.cleanOnBoot = true;
  zramSwap.enable = true;
  networking.hostName = "fw";
  services.openssh.enable = true;
  users.users.root.openssh.authorizedKeys.keys = [
    "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDN/2SAFm50kraB1fepAizox/QRXxB7WbqVbH+5OPalDT47VIJGNKOKhixQoqhABHxEoLxdf/C83wxlCVlPV9poLfDgVkA3Lyt5r3tSFQ6QjjOJAgchWamMsxxyGBedhKvhiEzcr/Lxytnoz3kjDG8fqQJwEpdqMmJoMUfyL2Rqp16u+FQ7d5aJtwO8EUqovhMaNO7rggjPpV/uMOg+tBxxmscliN7DLuP4EMTA/FwXVzcFNbOx3K9BdpMRAaSJt4SWcJO2cS2KHA5n/H+PQI7nz5KN3Yr/upJN5fROhi/SHvK39QOx12Pv7FCuWlc+oR68vLaoCKYhnkl3DnCfc7A7"
    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIRQuPqH5fdX3KEw7DXzWEdO3AlUn1oSmtJtHB71ICoH Generated By Termius"
  ];

  # backups
  borgbackup.repo = "u149513-sub2@u149513-sub2.your-backup.de:borg";

  system.stateVersion = "22.05";
}