/** Extract the distinct titles referenced as [[Wiki Links]] in a body of text. */
export function extractWikiLinks(text: string): string[] {
  const set = new Set<string>();
  for (const m of text.matchAll(/\[\[([^\]]+)\]\]/g)) {
    const title = m[1]?.trim();
    if (title) set.add(title);
  }
  return [...set];
}

/** Split text into plain segments and [[link]] segments for rendering. */
export function splitWikiLinks(text: string): { text: string; link?: string }[] {
  const parts: { text: string; link?: string }[] = [];
  let last = 0;
  for (const m of text.matchAll(/\[\[([^\]]+)\]\]/g)) {
    const idx = m.index ?? 0;
    if (idx > last) parts.push({ text: text.slice(last, idx) });
    parts.push({ text: m[1]!.trim(), link: m[1]!.trim() });
    last = idx + m[0].length;
  }
  if (last < text.length) parts.push({ text: text.slice(last) });
  return parts;
}