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

{
  boot.initrd.availableKernelModules = [ "usbhid" ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ ];
  boot.extraModulePackages = [ ];

  fileSystems."/" = {
    device = "/dev/disk/by-label/NIXOS_SD";
    fsType = "ext4";
  };

  fileSystems."/boot/firmware" = {
    device = "/dev/disk/by-label/FIRMWARE";
    fsType = "vfat";
  };

  swapDevices = [ ];

  hardware.enableRedistributableFirmware = true;
  powerManagement.cpuFreqGovernor = lib.mkDefault "performance";

  boot = {
    loader = {
      grub.enable = false;
      raspberryPi = {
        enable = true;
        version = 4;
        uboot.enable = true;
        firmwareConfig = ''
          gpu_mem=192
          dtparam=audio=on
        '';
      };
    };
    kernelPackages = pkgs.linuxPackages_5_13;
    kernelParams = lib.mkForce [
      "snd_bcm2835.enable_headphones=1"
      # don't let sd-image-aarch64.nix setup serial console as it breaks bluetooth.
      "console=tty0"
    ];
    # Don't build ZFS for aarch64 (broken?)
    supportedFilesystems = lib.mkForce [ "vfat" "ext4" ];

    tmpOnTmpfs = true;
  };
  sdImage = {
    compressImage = false;
    imageBaseName = config.networking.hostName;
    firmwareSize = 512;
  };

  c3d2 = {
    isInHq = true;
    mapHqHosts = true;
    hq.interface = "eth0";
    hq.statistics.enable = true;
  };

  nix = {
    buildCores = 4;
    maxJobs = 2;
  };

  networking = {
    hostName = "dacbert"; # Define your hostname.
    useDHCP = false;
    interfaces.eth0.useDHCP = true;
    firewall.enable = false;
  };

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

    mpv
    youtube-dl
    ncpamixer
    pulseaudio # required for pactl
    #chromium
    firefox
    pavucontrol
  ];

  programs.tmux.enable = true;

  # Do not log to flash:
  services.journald.extraConfig = ''
    Storage=volatile
  '';

  # Enable the OpenSSH daemon.
  services.openssh = {
    enable = true;
    permitRootLogin = "yes";
  };
  security.sudo = {
    enable = true;
    wheelNeedsPassword = false;
  };

  users.users.k-ot = {
    isNormalUser = true;
    extraGroups = [ "wheel" "audio" "video" ];
  };

  c3d2.audioServer.enable = true;

  # Select internationalisation properties.
  console = {
    font = "${pkgs.terminus_font}/share/consolefonts/ter-u28n.psf.gz";
    keyMap = "de";
  };

  # Enable the X11 windowing system.
  services.xserver.enable = true;
  services.xserver.layout = "de";
  services.xserver.xkbOptions = "eurosign:e";

  services.xserver.displayManager = {
    lightdm = { enable = true; };
    autoLogin = {
      enable = true;
      user = "k-ot";
    };
    defaultSession = "gnome-xorg";
  };
  services.xserver.desktopManager = {
    gnome.enable = true;
    # kodi.enable = true;
  };
  systemd.user.services.x11vnc = {
    description = "X11 VNC server";
    wantedBy = [ "graphical-session.target" ];
    partOf = [ "graphical-session.target" ];
    serviceConfig = {
      ExecStart = ''
        ${pkgs.x11vnc}/bin/x11vnc -shared -forever -passwd k-ot
      '';
      RestartSec = 3;
      Restart = "always";
    };
  };

  # 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).
  system.stateVersion = "21.05"; # Did you read the comment?
}