/**
 * Resolve which element should receive the overlay highlight when the pointer
 * hovers over the page. Simple wrapper, but kept isolated for testability.
 */
import {
  AUTOMATIC_TARGET_STAMP_ATTRIBUTE,
  MANUAL_TARGET_STAMP_ATTRIBUTE,
  STAMPED_ELEMENTS_SELECTOR
} from '../domStamping/constants.js';

export type EditableTarget = {
  element: HTMLElement;
  editUrl: string;
};

export function findEditableTarget(from: EventTarget | Element | null): EditableTarget | null {
  if (!from || !(from instanceof Element)) {
    return null;
  }

  const el = from.closest<HTMLElement>(STAMPED_ELEMENTS_SELECTOR);
  if (!el) {
    return null;
  }

  const url =
    el.getAttribute(MANUAL_TARGET_STAMP_ATTRIBUTE) ||
    el.getAttribute(AUTOMATIC_TARGET_STAMP_ATTRIBUTE);

  if (!url) {
    return null;
  }

  return { element: el, editUrl: url };
}