import * as cheerio from "cheerio";

/**
 * Fetch and extract the page title from a URL.
 */
export async function fetchUrlTitle(targetUrl: string): Promise<string | null> {
  try {
    const controller = new AbortController();
    const timeout = setTimeout(() => controller.abort(), 2500);

    const res = await fetch(targetUrl, {
      signal: controller.signal,
      headers: {
        "User-Agent":
          "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
        Accept: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
      },
    });

    clearTimeout(timeout);

    if (!res.ok) return null;

    const html = await res.text();
    const $ = cheerio.load(html);

    // 1. Try standard title tag
    let title = $("title").first().text().trim();

    // 2. Fallback to OpenGraph title
    if (!title) {
      title = $('meta[property="og:title"]').attr("content")?.trim() || "";
    }

    // 3. Fallback to Twitter title
    if (!title) {
      title = $('meta[name="twitter:title"]').attr("content")?.trim() || "";
    }

    return title ? title.slice(0, 255) : null;
  } catch (error) {
    console.warn(`Could not fetch title for ${targetUrl}:`, error);
    return null;
  }
}