{ lib, config, ... }:

let
  # --- Module variables ---
  moduleName = "waybar";
  username   = config.defaultUser or "henrov";

  # Assets directory
  assetPath =
    if builtins.pathExists ../../../assets/system/conf/${moduleName}
    then ../../../assets/system/conf/${moduleName}
    else null;

  # Read all files if assets exist
  programFiles =
    if assetPath != null
    then builtins.readDir assetPath
    else {};

  files = lib.genAttrs (builtins.attrNames programFiles) (name: {
    src = "${assetPath}/${name}";
  });

  # Top-level toggle for this module
  enableProgram = config.enableWaybar or false;
in
{
  # --- Top-level toggle option ---
  options.enableWaybar = lib.mkEnableOption "Enable Waybar status bar";

  # --- Only apply configuration if enabled ---
  config = lib.mkIf enableProgram {

    # --- Dendritic container ---
    waybar = {
      enable    = true;
      user      = username;
      assetsDir = assetPath;
      files     = files;
    };

    # --- Deploy configuration to ~/.config/waybar ---
    home-manager.users.${username} = lib.mkIf assetPath != null {
      xdg.configFile =
        lib.mapAttrs' (name: value: {
          name  = "${moduleName}/${name}";
          value.source = value.src;
        }) files;
    };

    # --- Optional systemd service to sync configs ---
    systemd.services."${moduleName}-sync" = {
      description = "Sync ${moduleName} configuration";
      wantedBy    = [ "multi-user.target" ];
      wants       = [ "network-online.target" ];
      after       = [ "network-online.target" ];

      serviceConfig = {
        Type = "oneshot";
        ExecStart = ''
          set -euo pipefail
          if [ -d "${assetPath}" ]; then
            for f in ${lib.concatStringsSep " " (builtins.attrNames files)}; do
              cp -u "${assetPath}/$f" "/home/${username}/.config/${moduleName}/$f"
            done
          fi
        '';
      };

      restartTriggers = [ assetPath ];
      path = [];
    };
  };
}