{
  lib,
  pkgs,
  config,
  ...
}:
let
  cfg = config.host.nix;
in
{
  options = {
    host.nix = {
      enable = lib.mkOption {
        type = lib.types.bool;
        default = true;
        description = "Nix settings for host.";
      };
      optimization.enable = lib.mkOption {
        type = lib.types.bool;
        default = false;
        description = "Nix store optimization.";
      };
    };
  };

  config = lib.mkIf cfg.enable {
    nix = {
      package = pkgs.nix;

      settings = {
        warn-dirty = false;
        experimental-features = [
          "flakes"
          "nix-command"
          "pipe-operators"
        ];
      };

      optimise = lib.mkIf cfg.optimization.enable {
        automatic = true;
      };
    };
  };
}