{ 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;
  #networking.wireless.enable = true;
  powerManagement.cpuFreqGovernor = lib.mkDefault "performance";

  boot = {
    loader = {
      grub.enable = false;
      raspberryPi = {
        enable = true;
        version = 3;
        uboot.enable = true;
        firmwareConfig = ''
          gpu_mem=192
          dtparam=audio=on
        '';
      };
    };
    kernelPackages = pkgs.linuxPackages_5_13;
    # 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 = true;
  };

  # 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
  ];

  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" ];
  };

  hardware.pulseaudio = {
    enable = true;
    systemWide = true;
    tcp.enable = true;
    tcp.anonymousClients.allowedIpRanges = [
      "127.0.0.0/8"
      "::1/128"
      "fd23:42:c3d2:500::/56"
      "172.22.99.0/24"
      "172.20.72.0/21"
      "2a00:8180:2c00:200::/56"
    ];
    zeroconf.publish.enable = true;
    package = pkgs.pulseaudioFull;
    extraModules = [ pkgs.pulseaudio-modules-bt ];
  };
  #services.pipewire = {
  #  enable = true;
  #  alsa.enable = true;
  #  config.pipewire-pulse = lib.importJSON ./pipewire-pulse.conf.json;
  #  pulse.enable = true;
  #};
  security.rtkit.enable = true;

  # 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?
}