# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, lib, ... }:
let
  nvidia-offload = pkgs.writeShellScriptBin "nvidia-offload" ''
    export __NV_PRIME_RENDER_OFFLOAD=1
    export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
    export __GLX_VENDOR_LIBRARY_NAME=nvidia
    export __VK_LAYER_NV_optimus=NVIDIA_only
    exec "$@"
  '';
in
{
  imports =
    [
      # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  # home-manager
  home-manager.useGlobalPkgs = true;
  home-manager.useUserPackages = true;
  home-manager.users.victor = import ./home.nix;

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

  # Enable networking
  networking.networkmanager.enable = true;
  networking.interfaces.wlp0s20f3.useDHCP = true;

  fileSystems."/".options = [ "compress=zstd" ];

  # Select internationalisation properties.
  i18n.defaultLocale = "en_GB.utf8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "en_DK.utf8";
    LC_IDENTIFICATION = "en_DK.utf8";
    LC_MEASUREMENT = "en_DK.utf8";
    LC_MONETARY = "en_DK.utf8";
    LC_NAME = "en_DK.utf8";
    LC_NUMERIC = "en_DK.utf8";
    LC_PAPER = "en_DK.utf8";
    LC_TELEPHONE = "en_DK.utf8";
    LC_TIME = "en_DK.utf8";
  };

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

  # Enable the GNOME Desktop Environment.
  services.xserver.displayManager.gdm.enable = true;
  services.xserver.desktopManager.gnome.enable = true;
  services.udev.packages = with pkgs; [ gnome.gnome-settings-daemon ];

  services.xserver = {
    layout = "us";
    xkbVariant = "altgr-intl";
    xkbOptions = "caps:swapescape";
    videoDrivers = [ "nvidia" ];
  };

  # hardware.nvidia.modesetting.enable = true;
  hardware.nvidia.prime = {
    offload.enable = true;
    intelBusId = "PCI:0:2:0";
    nvidiaBusId = "PCI:1:0:0";
  };

  hardware.opengl.extraPackages = with pkgs; [
    vaapiVdpau
  ];

  virtualisation.podman.enable = true;

  # 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;
  };

  environment.systemPackages = with pkgs; [
    gnome.gnome-tweaks
    pciutils
    nvidia-offload
    vim
    wireguard-tools

    gnomeExtensions.appindicator
    gnomeExtensions.wireguard-indicator
  ];

  programs.steam = {
    enable = true;
    remotePlay.openFirewall = true;
    dedicatedServer.openFirewall = true;
  };

  services.fstrim.enable = true;

  # Allow reverse path for wireguard
  networking.firewall = {
    # if packets are still dropped, they will show up in dmesg
    logReversePathDrops = true;
    # wireguard trips rpfilter up
    extraCommands = ''
      ip46tables -t raw -I nixos-fw-rpfilter -p udp -m udp --sport 51820 -j RETURN
      ip46tables -t raw -I nixos-fw-rpfilter -p udp -m udp --dport 51820 -j RETURN
    '';
    extraStopCommands = ''
      ip46tables -t raw -D nixos-fw-rpfilter -p udp -m udp --sport 51820 -j RETURN || true
      ip46tables -t raw -D nixos-fw-rpfilter -p udp -m udp --dport 51820 -j RETURN || 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 = "22.05"; # Did you read the comment?

}