export function insertOrEditLink(root: HTMLElement, href?: string) {
  const sel = document.getSelection();
  if (!sel || sel.rangeCount === 0) return;
  const range = sel.getRangeAt(0);

  let n: Node | null = range.startContainer;
  let a: HTMLAnchorElement | null = null;

  while (n && n !== root) {
    if (n instanceof HTMLAnchorElement) {
      a = n;
      break;
    }
    n = n.parentNode;
  }

  const url =
    href ??
    (typeof window !== 'undefined'
      ? window.prompt('Enter URL', a?.href || 'https://') || ''
      : '');

  if (!url) return;

  if (a) {
    a.href = url;
    return;
  }

  if (range.collapsed) {
    const link = document.createElement('a');
    link.href = url;
    link.textContent = url;

    range.insertNode(link);

    const r = document.createRange();
    r.setStartAfter(link);
    r.collapse(true);
    sel.removeAllRanges();
    sel.addRange(r);
    return;
  }

  const link = document.createElement('a');
  link.href = url;

  try {
    range.surroundContents(link);
  } catch {
    const frag = range.extractContents();
    link.appendChild(frag);
    range.insertNode(link);
  }
}