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

let
  name = "nix";
  cfg = config.nixowos.defaults.${name};
in
{
  options.nixowos.defaults.${name} = {
    enable = lib.mkEnableOption name;
  };

  config = lib.mkIf cfg.enable {
    # enable useful nix tools, and the flakes system
    nix.settings.experimental-features = "nix-command flakes";
    # you (should) never need this
    nix.channel.enable = false;

    # reduces disk usage of the nix store
    # It does this by performing `nix store optimize` incrementally for each new path
    # source: https://nix.dev/manual/nix/2.26/command-ref/new-cli/nix3-store-optimise
    nix.settings.auto-optimise-store = true;

    # trigger the garbage collector automatically
    # when free space in /nix/store goes below this
    nix.settings.min-free = 1000000000; # 1GB
    # free up to this many bytes in an automatic invocation
    # to avoid it taking too long
    nix.settings.max-free = 5000000000; # 5GB
  };
}