{
  pkgs,
  config,
  lib,
  ...
}: {
  # hyprland configs, based on https://github.com/notwidow/hyprland
  home.file.".config/hypr" = {
    source = ./hypr-conf;
    # copy the scripts directory recursively
    recursive = true;
  };
  home.file.".config/gtk-3.0" = {
    source = ./gtk-3.0;
    recursive = true;
  };
  home.file.".gtkrc-2.0".source = ./gtkrc-2.0;
  home.file.".config/hypr/wallpapers/wallpaper.png".source = ../wallpapers/wallpaper.png;
  
  home.file.".config/fcitx5/profile".source = ./profile;
  home.file.".config/fcitx5/profile-bak".source = ./profile;  # used for backup
  # fcitx5 每次切换输入法，就会修改 ~/.config/fcitx5/profile 文件，导致我用 hm 管理的配置被覆盖
  # 解决方法是通过如下内置，每次 rebuild 前都先删除下 profile 文件
  home.activation.removeExistingFcitx5Profile = lib.hm.dag.entryBefore ["checkLinkTargets"] ''
    rm -f "${config.xdg.configHome}/fcitx5/profile"
  '';

  # allow fontconfig to discover fonts and configurations installed through home.packages
  fonts.fontconfig.enable = true;

  # set cursor size and dpi for 4k monitor
  # this is for xwayland
  xresources.properties = {
    "Xcursor.size" = 16;
    "Xft.dpi" = 160;
  };
  
  systemd.user.sessionVariables = {
    "NIXOS_OZONE_WL" = "1";  # for any ozone-based browser & electron apps to run on wayland
    "MOZ_ENABLE_WAYLAND" = "1";  # for firefox to run on wayland
    "MOZ_WEBRENDER" = "1";

    # for hyprland with nvidia gpu, ref https://wiki.hyprland.org/Nvidia/
    "LIBVA_DRIVER_NAME" = "nvidia";
    "XDG_SESSION_TYPE" = "wayland";
    "GBM_BACKEND" = "nvidia-drm";
    "__GLX_VENDOR_LIBRARY_NAME" = "nvidia";
    "WLR_NO_HARDWARE_CURSORS" = "1";
    "WLR_EGL_NO_MODIFIRES" = "1";

    # copy from  https://github.com/nix-community/home-manager/blob/master/modules/i18n/input-method/fcitx5.nix
    GLFW_IM_MODULE = "fcitx";
    GTK_IM_MODULE = "fcitx";
    QT_IM_MODULE = "fcitx";
    XMODIFIERS = "@im=fcitx";
    INPUT_METHOD = "fcitx";
    IMSETTINGS_MODULE  = "fcitx";
  };
}