{ pkgs, shell, ... }:
let flakeURL = "git+https://git.xenia.me.uk/xenia/nixos.git?ref=main";
in {
  nix = {
    settings = {
      experimental-features = [ "nix-command" "flakes" ];
      auto-optimise-store = true;
    };
    gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than 30d";
    };
    extraOptions = ''
      keep-outputs = true
      keep-derivations = true
      min-free = ${toString (100 * 1024 * 1024)}
      max-free = ${toString (1024 * 1024 * 1024)}
    '';
  };
  system.autoUpgrade.flake = flakeURL;
  environment = {
    localBinInPath = true;
    systemPackages = with pkgs; [ distrobox ];
    shellAliases.nou = ''sudo nixos-rebuild switch --flake "${flakeURL}"'';
  };
  networking.networkmanager.enable = true;
  services = {
    power-profiles-daemon.enable = true;
    passSecretService.enable = true;
  };
  virtualisation.podman.enable = true;
  programs = { ${shell}.enable = true; };
  # 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";
    };
  };
}