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

let
  username = config.defaultUser or "henrov";

  modulesPath = ./generated/modules;
  imported = inputs.import-tree modulesPath;

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

  # STEP 1: evaluate all modules first
  evaluatedModules =
    map (m:
      if builtins.isFunction m
      then m { inherit lib config; }
      else m
    ) imported.imports;

  # STEP 2: attach names safely, stripping .nix
  modulesWithNames =
    map (m: {
      name =
        if m ? _file
        then builtins.replaceSuffix ".nix" "" (builtins.baseNameOf m._file)
        else "unknown";
      value = m;
    }) evaluatedModules;

  # STEP 3: filter enabled modules
  enabledModules =
    builtins.filter (m: moduleSwitches.${m.name} or false) modulesWithNames;

  # STEP 4: extract final module values
  moduleList = map (m: m.value) enabledModules;

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

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

  home-manager.users =
    lib.mkMerge moduleList;

    # Logging to screen
    # Print number of enabled modules and each module's attribute count
    tracing1 = builtins.trace
      (builtins.concatStringsSep "\n"
        (map (m: "${m.name} (${builtins.toString (builtins.length (builtins.attrNames m.value))} attrs)") enabledModules))
      true;

    tracing2 = builtins.trace
      (toString (builtins.length enabledModules) + " modules enabled: " + builtins.concatStringsSep ", " (map (m: m.name) enabledModules))
      true;

    # logging to file
    let
      debugFile = "/tmp/traveldroid-modules-debug.txt";
      debugContents = builtins.concatStringsSep "\n"
        (map (m: "${m.name} (${builtins.toString (builtins.length (builtins.attrNames m.value))} attrs)") enabledModules);
    in
    {
      # Write a file during the build
      environment.etc."traveldroid-modules-debug.txt".text = debugContents;
    }
}