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

let
  username = config.defaultUser or "henrov";

  # Import modules
  modulesPath = ./generated/modules;
  moduleSwitches = builtins.fromJSON (builtins.readFile ./assets/system/conf/modules.json);
  importedModules = inputs.import-tree modulesPath;

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

  moduleList = builtins.attrValues enabledModules;

  # Function to safely evaluate a fragment
  safeFragment = m:
    let
      frag = if builtins.hasAttr "homeManagerExtraUserFragment" m
             then m.homeManagerExtraUserFragment
             else {};
      evaled = if builtins.isFunction frag then frag {} else frag;
    in if builtins.isAttrs evaled then evaled else {};

  # Merge all fragments
  mergedFragments = lib.foldl' lib.mkMerge {} (map safeFragment moduleList);

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

  # Top-level key is username → merged fragments
  home-manager.users = {
    "${username}" = mergedFragments;
  };
}