{
  pkgs,
  shell,
  ...
}: let
  flakeURL = "git+https://git.xenia.me.uk/xenia/nixos.git?ref=main";
in {
  nix = {
    settings.experimental-features = ["nix-command" "flakes"];
    gc = {
      automatic = true;
      dates = "daily";
      options = "--delete-older-than 7d";
    };
    extraOptions = ''
      keep-outputs = true
      keep-derivations = true
    '';
  };
  system.autoUpgrade = {
    enable = true;
    flake = flakeURL;
  };
  environment = {
    localBinInPath = true;
    shellAliases = {
      ll = "ls -laF";
      nosu = "sudo nixos-rebuild switch --flake \"${flakeURL}\"";
      hms = "${pkgs.home-manager}/bin/home-manager switch --flake \"${flakeURL}\"";
    };
    systemPackages = with pkgs; [distrobox];
  };
  networking.networkmanager.enable = true;
  services.power-profiles-daemon.enable = true;
  virtualisation.podman.enable = true;
  programs = {
    ${shell}.enable = true;
    ssh.startAgent = true;
    dconf.enable = true;
  };
  fonts = {
    fonts = with pkgs; [
      # icon fonts
      material-symbols
      # normal fonts
      jost
      lexend
      noto-fonts
      noto-fonts-cjk
      noto-fonts-emoji
      roboto
      # nerdfonts
      (nerdfonts.override {fonts = ["FiraCode"];})
    ];
    # use fonts specified by user rather than default ones
    enableDefaultFonts = false;
    fontconfig = {
      enable = true;
      # user defined fonts
      # the reason there's Noto Color Emoji everywhere is to override DejaVu's
      # B&W emojis that would sometimes show instead of some Color emojis
      defaultFonts = {
        serif = ["Noto Serif" "Noto Color Emoji"];
        sansSerif = ["Noto Sans" "Noto Color Emoji"];
        monospace = ["FiraCode Nerd Font" "Noto Color Emoji"];
        emoji = ["Noto Color Emoji"];
      };
    };
  };
  services.xserver = {
    layout = "gb";
    xkbVariant = "";
  };
  console.keyMap = "uk";
  # Set your time zone.
  time.timeZone = "Europe/London";
  i18n = {
    # Select internationalisation properties.
    defaultLocale = "en_GB.UTF-8";
    extraLocaleSettings = {
      LC_ADDRESS = "en_GB.UTF-8";
      LC_IDENTIFICATION = "en_GB.UTF-8";
      LC_MEASUREMENT = "en_GB.UTF-8";
      LC_MONETARY = "en_GB.UTF-8";
      LC_NAME = "en_GB.UTF-8";
      LC_NUMERIC = "en_GB.UTF-8";
      LC_PAPER = "en_GB.UTF-8";
      LC_TELEPHONE = "en_GB.UTF-8";
      LC_TIME = "en_GB.UTF-8";
    };
  };
}