{
  config,
  pkgs,
  lib,
  ...
}:

let
  wallpaperSource = "${config.home.homeDirectory}/.config/wpaperd-source"; # or flakeRoot path
  wallpaperTarget = "${config.home.homeDirectory}/.config/wpaperd";
in
{
  home.packages = [ pkgs.wpaperd ];

  home.file.".config/wpaperd/wallpaper.conf".source = "${wallpaperSource}/wallpaper.conf";

  home.activation.copyWpaperd = lib.homeManager.activationScript {
    name = "copy-wpaperd";
    text = ''
      echo "=== Copying wpaperd source to ${wallpaperTarget} ==="
      mkdir -p "${wallpaperTarget}"
      cp -rT "${wallpaperSource}" "${wallpaperTarget}"
      echo "Done."
    '';
  };

  home.sessionVariables = {
    WPAPERD_CONFIG = "${wallpaperTarget}/wallpaper.conf";
  };

  # User-level service
  home.file.".config/systemd/user/wpaperd.service".text = ''
    [Unit]
    Description=wpaperd wallpaper daemon
    After=default.target

    [Service]
    Type=simple
    ExecStart=${pkgs.wpaperd}/bin/wpaperd --config ${wallpaperTarget}/wallpaper.conf
    Restart=on-failure
    RestartSec=1

    [Install]
    WantedBy=default.target
  '';
}