{ pkgs, lib, config, options, ... }:
with lib;

{
  config = {
    nix = {
      package = pkgs.nixVersions.stable;

      extraOptions = ''
        experimental-features = nix-command flakes
      '';

      settings = {
        substituters = [
          "https://cache.nixos.org"
          "https://nix-community.cachix.org"
          "https://nixpkgs.cachix.org"
          "https://tboerger.cachix.org"
        ];

        trusted-public-keys = [
          "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
          "nixpkgs.cachix.org-1:q91R6hxbwFvDqTSDKwDAV4T5PxqXGxswD8vhONFMeOE="
          "tboerger.cachix.org-1:3Q1gyqgA9NsOshOgknDvc6fhA8gw0PFAf2qs5vJpeLU="
        ];
      };

      gc = {
        automatic = true;
        persistent = true;
        dates = "weekly";
        options = "--delete-older-than 2w";
      };
    };

    nixpkgs = {
      config = {
        allowUnfree = true;
      };
    };
  };
}