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

let
  username = config.defaultUser or "henrov";

  modulesPath = ./generated/parked;
  importedModules = inputs.import-tree modulesPath;
  moduleSwitches = import ./assets/system/modules.conf;

  enabledModules =
    lib.filterAttrs (name: _: moduleSwitches.${name} or false)
      importedModules.imports;

  moduleList = builtins.attrValues enabledModules;

  # Functie om fragment veilig te evalueren en debug info te verzamelen
  debugFragment = module:
    let
      frag =
        if builtins.hasAttr "homeManagerExtraUserFragment" module
        then module.homeManagerExtraUserFragment
        else {};
      evaluated =
        if builtins.isFunction frag then frag {} else frag;

      isAttrs = builtins.isAttrs evaluated;
      isList  = builtins.isList evaluated;
      isThunk = builtins.isFunction frag;
    in
      {
        fragment = if isAttrs then evaluated else {};
        debug = {
          name = if builtins.hasAttr "name" module then module.name else "unknown";
          isAttrs = isAttrs;
          isList = isList;
          isThunk = isThunk;
        };
      };

  # Alle fragments met debug info
  fragmentsWithDebug = map debugFragment moduleList;

  # Lijst van problematische modules
  problematicModules = builtins.filter
    (x: !(x.debug.isAttrs))
    fragmentsWithDebug;

  # Merge alleen veilige fragments
  safeFragments = map (x: x.fragment) fragmentsWithDebug;
  mergedForUser = lib.foldl' lib.mkMerge {} safeFragments;

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

  # Top-level key is username → value is attrset
  home-manager.users = {
    "${username}" = mergedForUser;
  };

  # Extra debug output, alleen zichtbaar als je `nix eval` gebruikt
  debug.problematicModules = problematicModules;
}