{ lib, config, pkgs, 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
  evaluatedModules =
    map (m: if builtins.isFunction m then m { inherit lib config; } else m) imported.imports;

  # STEP 2: attach names safely
  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: build debug string
  debugContents = builtins.concatStringsSep "\n"
    (map (m: "${m.name} (${builtins.toString (builtins.length (builtins.attrNames m.value))} attrs)") enabledModules);

  # STEP 5: force evaluation to print to screen
  _ = builtins.trace ("==== Enabled modules (" + toString (builtins.length enabledModules) + ") ====\n" + debugContents) true;

  # STEP 6: write to host /tmp during build
  hostDebugFile = pkgs.runCommand "traveldroid-modules-debug-host" {
    buildInputs = [ pkgs.coreutils ];
  } ''
    echo "${debugContents}" > /tmp/traveldroid-modules-debug.txt
    mkdir -p $out
    touch $out/dummy
  '';

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

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

  home-manager.users = lib.mkMerge (map (m: m.value) enabledModules);

  # Write debug file inside VM
  environment.etc."traveldroid-modules-debug.txt".text = debugContents;

  # Ensure host-side debug file is built
  system.build.hostDebugDummy = hostDebugFile;
}