/**
 * @internal
 * @module
 */

/**
 * back up an elements idl and content and restore it when the passed signal emits
 */
export const backup = (
  element: HTMLElement,
  until: { signal: AbortSignal },
) => {
  const backup = {
    idl: JSON.parse(JSON.stringify(element)),
    content: Object.fromEntries(
      Array.from(element.attributes).map((attr) => [attr.name, attr.value]),
    ),
  };

  until.signal.addEventListener(
    "abort",
    () => {
      Object.assign(element, backup.idl);
      Object.entries(backup.content).forEach(([name, value]) =>
        element.setAttribute(name, value),
      );
    },
    until,
  );
};