{ lib
, pkgs
, config
, ...
}:
with lib; let
  cfg = config.eboskma.nix-common;
in
{
  options.eboskma.nix-common = {
    enable = mkEnableOption "activate nix-common";
    disable-cache = mkEnableOption "no not use binary cache";
  };

  config = mkIf cfg.enable {
    nixpkgs = {
      config.allowUnfree = true;
    };

    nix = {
      package = pkgs.nixFlakes;
      extraOptions = ''
        experimental-features = nix-command flakes
      '';

      settings = {
        auto-optimise-store = true;
        allowed-users = [ "root" ];
        substituters = [
          "https://nix-community.cachix.org"
          "https://marcus7070.cachix.org"
        ] ++ lib.optionals (! cfg.disable-cache) [ "http://loki.datarift.nl" ];

        trusted-public-keys = [
          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
          "marcus7070.cachix.org-1:JawxHSgnYsgNYJmNqZwvLjI4NcOwrcEZDToWlT3WwXw="
        ] ++ lib.optionals (! cfg.disable-cache) [ "loki.datarift.nl:Mk+g9h52oCWtCi6b6KxRkntrD+HZVhwNT8muUQtgKoA=" ];
      };

      gc = {
        automatic = true;
        dates = "daily";
        options = "--delete-older-than=30d";
      };
    };
  };
}