# file: wallpaper-copy.nix
{
  lib,
  config,
  pkgs,
  flakeRoot,
  ...
}:

let
  sourceDir = "${flakeRoot}/assets/hyprland/wallpaperstuff";

  # Determine the username safely (fallback to "default" if home-manager is not present)
  username =
    if lib.attrExists "home" config && lib.attrExists "username" config.home then
      config.home.username
    else
      "default";

  # Determine target directory
  targetDir =
    if lib.attrExists "home" config then
      "${config.home.homeDirectory}/Droidnix/wallpaperstuff"
    else
      "$HOME/Droidnix/wallpaperstuff";

in
{
  options.wallpaper.enable = lib.mkEnableOption "Copy wallpaperstuff dir";

  config = lib.mkIf config.wallpaper.enable {

    # System activation (runs on nixos-rebuild switch)
    system.activationScripts.copyWallpapers = {
      text = ''
        echo "=== Copying wallpaperstuff (system activation) ==="
        mkdir -p "${targetDir}"
        cp -rT "${sourceDir}" "${targetDir}"
        echo "Done."
      '';
      deps = [ ];
    };

    # Home Manager activation (runs when home-manager switch is executed)
    home-manager.users.${username}.home.activation.copyWallpapers =
      lib.mkIf (lib.attrExists "home" config)
        {
          description = "Copy wallpaperstuff to user home";
          script = ''
            echo "=== Copying wallpaperstuff (home-manager activation) ==="
            mkdir -p "${targetDir}"
            cp -rT "${sourceDir}" "${targetDir}"
            echo "Done."
          '';
        };
  };
}