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

let
  # Most of the standard Darwin-detection methods cause infinite recursion.
  isDarwin = options.environment ? "darwinConfig";

in {
  home.qyliss.dirs."state/nix" = {};

  nix.nixPath = [
    "nixos-config=/run/current-system/nixlib/sys/${config.networking.hostName}.nix"
    "/run/current-system/nixlib"
  ];

  nix.autoOptimiseStore = true;
  nix.daemonNiceLevel = 2;
  nix.trustedUsers = [ "@wheel" ];

  system.extraSystemBuilderCmds = ''
    ln -s ${lib.cleanSource ../..} $out/nixlib
  '';

  nixpkgs.overlays =
    let
      inherit (builtins) attrNames readDir;
      dir = ../../overlays;
      names = attrNames (readDir dir);
    in
      map (o: import "${dir}/${o}") names;

  services = lib.optionalAttrs isDarwin
    { nix-daemon.enable = true; };
}