{ 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: create REAL debug file in store
  hostDebugFile = pkgs.runCommand "traveldroid-modules-debug-host" {} ''
    mkdir -p $out
    cat > $out/traveldroid-modules-debug.txt <<EOF
${debugContents}
EOF
  '';

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

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

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

  # Debug file inside VM (optional fallback)
  environment.etc."traveldroid-modules-debug.txt".text = debugContents;

  # Expose derivation so post-build hook can detect it
  system.build.traveldroidDebug = hostDebugFile;
}