{ lib, config, inputs, ... }:

let
  username = config.defaultUser or "henrov";

  modulesPath = ./generated/modules;

  # import-tree gives { imports = { name = module; ... }; }
  imported = inputs.import-tree modulesPath;

  moduleSwitches = import ./assets/system/modules.conf;

  # keep only enabled modules
  enabledModules =
    lib.filterAttrs (name: _: moduleSwitches.${name} or false)
      imported.imports;

  # evaluate modules properly (IMPORTANT)
  evaluatedModules =
    builtins.mapAttrs (_: m:
      if builtins.isFunction m
      then m { inherit lib config; }
      else m
    ) enabledModules;

  # final list of user fragments
  moduleList = builtins.attrValues evaluatedModules;

in
{
  networking.hostName = "traveldroid";
  system.stateVersion = "26.05";

  home-manager.users =
    lib.mkMerge moduleList;

  # bonus: see what got loaded
  environment.variables.LOADED_MODULES =
    builtins.concatStringsSep "," (builtins.attrNames enabledModules);
}