{
    config,
    inputs,
    lib,
    pkgs,
    ...
}: let
    cfg = config.poz.programs.nh;

    inherit (lib.modules) mkIf;
    inherit (lib.options) mkEnableOption mkOption;
    inherit (lib.types) str;
in {
    options.poz.programs.nh = {
        enable = mkEnableOption "nh";
        flake = mkOption {
            type = str;
            description = "flake directory";
        };
    };

    config = mkIf cfg.enable {
        nix.settings = {
            substituters = [
                "https://viperml.cachix.org"
            ];
            trusted-public-keys = [
                "viperml.cachix.org-1:qZhKBMTfmcLL+OG6fj/hzsMEedgKvZVFRRAhq7j8Vh8="
            ];
        };

        programs.nh = {
            enable = true;
            package = inputs.nh.packages.${pkgs.system}.default;
            inherit (cfg) flake;
            clean = {
                enable = true;
                dates = "weekly";
                extraArgs = "--keep 10";
            };
        };
    };
}