{ lib, config, pkgs, flakeRoot, import-tree, home-manager, ... }:

let
  hostname    = "traveldroid";

  modulesPath = "${flakeRoot}/generated/modules/${hostname}";
  usersPath   = "${flakeRoot}/generated/users";

  # Import module trees (NOT evaluated yet)
  hostModules   = import-tree modulesPath;
  globalUsers   = import-tree usersPath;

  allModules = hostModules.imports ++ globalUsers.imports;

  # Collect all hmUsers safely
  hmUsersList =
    map (m: m._module.args.hmUsers or {}) allModules;

in
{
  #################################
  # Core system config
  #################################

  networking.hostName = hostname;
  system.stateVersion = "26.05";

  #################################
  # CRITICAL: enable Home Manager
  #################################

  imports =
    [
      ./boot.nix
      ./hardware-configuration.nix

      # THIS is required
      home-manager.nixosModules.home-manager
    ]
    ++ allModules;

  #################################
  # Home Manager settings
  #################################

  programs.home-manager.enable = true;

  # Merge all hmUsers from modules
  home-manager.users = lib.mkMerge hmUsersList;

  #################################
  # Optional but recommended
  #################################

  home-manager.useGlobalPkgs = true;
  home-manager.useUserPackages = true;
}