import express from "express";
import axios from "axios";
import * as cheerio from "cheerio";
import { URL } from "url";

const router = express.Router();

// Normalizza URL relativi → assoluti
function normalize(base, relative) {
  try {
    return new URL(relative, base).href;
  } catch {
    return null;
  }
}

// Scarica HTML con fallback CORS
async function fetchHTML(url) {
  try {
    const res = await axios.get(url, {
      timeout: 8000,
      headers: {
        "User-Agent": "Mozilla/5.0"
      }
    });
    return res.data;
  } catch (err) {
    return null;
  }
}

router.get("/", async (req, res) => {
  const siteUrl = req.query.url;
  if (!siteUrl) return res.json({ error: "Missing URL" });

  const html = await fetchHTML(siteUrl);
  if (!html) return res.json({ name: null, icon: null });

  const $ = cheerio.load(html);

  // -----------------------------------------
  // 1. Trova il nome più corto
  // -----------------------------------------
  let names = [];

  const title = $("title").text().trim();
  if (title) names.push(title);

  $('meta[name="application-name"]').each((i, el) => {
    const v = $(el).attr("content");
    if (v) names.push(v.trim());
  });

  $('meta[property="og:site_name"]').each((i, el) => {
    const v = $(el).attr("content");
    if (v) names.push(v.trim());
  });

  const shortestName = names.length
    ? names.sort((a, b) => a.length - b.length)[0]
    : null;

  // -----------------------------------------
  // 2. Trova l’icona più grande
  // -----------------------------------------
  let icons = [];

  $('link[rel="icon"], link[rel="shortcut icon"], link[rel="apple-touch-icon"], link[rel="apple-touch-icon-precomposed"]').each((i, el) => {
    const href = $(el).attr("href");
    if (!href) return;

    const sizeAttr = $(el).attr("sizes");
    let size = 0;

    if (sizeAttr && sizeAttr.includes("x")) {
      const parts = sizeAttr.split("x");
      size = parseInt(parts[0]) || 0;
    }

    icons.push({
      url: normalize(siteUrl, href),
      size
    });
  });

  // fallback favicon
  icons.push({
    url: normalize(siteUrl, "/favicon.ico"),
    size: 16
  });

  // Ordina per dimensione
  icons = icons.filter(i => i.url);
  icons.sort((a, b) => b.size - a.size);

  const bestIcon = icons.length ? icons[0].url : null;

  res.json({
    name: shortestName,
    icon: bestIcon
  });
});

export default router;