/**
 * `true` when the element is considered disabled — either via a direct
 * `disabled` attribute, an `aria-disabled="true"` attribute, or an ancestor
 * `<fieldset disabled>` (which disables all form controls within it, per
 * HTML spec).
 *
 * A `null` element is treated as disabled: callers typically use this to
 * guard keyboard navigation, and a missing element should never receive
 * focus.
 */
export function isElementDisabled(element) {
  if (element == null) {
    return true;
  }
  if (element.hasAttribute("disabled")) {
    return true;
  }
  if (element.getAttribute("aria-disabled") === "true") {
    return true;
  }

  // Nearest ancestor <fieldset disabled> disables all contained form
  // controls. We walk up the tree rather than relying on :disabled because
  // the CSS pseudo-class does not work via `element.matches` in every
  // environment (notably happy-dom).
  let parent = element.parentElement;
  while (parent != null) {
    if (parent.tagName === "FIELDSET" && parent.disabled) {
      return true;
    }
    parent = parent.parentElement;
  }
  return false;
}
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