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

let
  # Default user
  username = config.defaultUser or "henrov";

  # Path to modules and config
  modulesPath = ./generated/modules;
  moduleSwitches = builtins.fromJSON (builtins.readFile ./assets/system/conf/modules.json);

  # Import all modules recursively
  importedModules = inputs.import-tree modulesPath;

  # Only enabled modules (according to modules.json)
  enabledModules =
    lib.filterAttrs (name: _: moduleSwitches.${name} or false)
      importedModules.imports;

  # Flatten enabled modules to a list
  moduleList = builtins.attrValues enabledModules;

  # Debug info / list of imported module files
  importedFiles = map (m:
    if builtins.hasAttr "file" m then m.file else "unknown"
  ) moduleList;

  # Extract and force each homeManagerExtraUserFragment to attrset
  fragmentsPerModule = map (m:
    if builtins.hasAttr "homeManagerExtraUserFragment" m
    then m.homeManagerExtraUserFragment
    else {}
  ) moduleList;

  # Merge all fragments per username (top-level keys are usernames)
  mergedUserFragments = lib.foldl' lib.mkMerge {} fragmentsPerModule;

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

  # Pass the merged fragments directly to home-manager
  home-manager.users = mergedUserFragments;

  # Bonus debug info: list of imported modules
  debug.importedFiles = importedFiles;
}