// 外部身份 → 外站链接(媒体详情头部):TMDB / IMDb / TVDB / Wikidata。只拼公开地址,不带任何凭证。

export function externalLinks(ids: {
  tmdb?: { type: "movie" | "tv"; id: string } | null;
  imdb?: string | null;
  tvdb?: string | null;
  wikidata?: string | null;
  tvdbKind?: "movie" | "series";
}): { label: string; href: string }[] {
  const out: { label: string; href: string }[] = [];
  if (ids.tmdb && /^\d+$/.test(ids.tmdb.id))
    out.push({ label: "TMDB", href: `https://www.themoviedb.org/${ids.tmdb.type}/${ids.tmdb.id}` });
  if (ids.imdb && /^tt\d+$/.test(ids.imdb))
    out.push({ label: "IMDb", href: `https://www.imdb.com/title/${ids.imdb}/` });
  if (ids.tvdb && /^\d+$/.test(ids.tvdb))
    out.push({
      label: "TVDB",
      href: `https://thetvdb.com/dereferrer/${ids.tvdbKind ?? (ids.tmdb?.type === "movie" ? "movie" : "series")}/${ids.tvdb}`,
    });
  if (ids.wikidata && /^Q\d+$/.test(ids.wikidata))
    out.push({ label: "Wikidata", href: `https://www.wikidata.org/wiki/${ids.wikidata}` });
  return out;
}