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

{
  environment.etc = {
    "nix/channels/nixpkgs".source = nixpkgs.outPath;
  };

  nix = {
    extraOptions = ''
      keep-outputs = true
      keep-derivations = true
      experimental-features = nix-command flakes
    '';

    registry = {
      nixpkgs.flake = nixpkgs;
    };

    nixPath = [
      "nixpkgs=/etc/nix/channels/nixpkgs"
    ];

    settings = {
      trusted-users = [ "@wheel" ];
      auto-optimise-store = true;

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

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