import { chromium, Browser } from "playwright";

let browser: Browser | null = null;

async function getBrowser(): Promise<Browser> {
  if (!browser || !browser.isConnected()) {
    browser = await chromium.launch({
      headless: true,
      args: [
        "--no-sandbox", 
        "--disable-setuid-sandbox",
        "--disable-dev-shm-usage",
        "--disable-gpu"
      ],
    });
  }
  return browser;
}

// Navbar'da atlanacak anahtar kelimeler
const SKIP_KEYWORDS = [
  "kariyer", "/ik", "kvkk", "gizlilik", "cerez",
  "blog", "haber", "saglikbulteni", "saglik-rehberi",
  "rezervasyon", "randevu", "e-sonuc", "checkup",
  "wp-admin", "wp-content", "feed", "sitemap",
];

const SKIP_SCHEMES = ["mailto:", "tel:", "javascript:", "#"];

export interface NavLink {
  label: string;
  url: string;
}

export async function extractNavLinks(targetUrl: string): Promise<NavLink[]> {
  const base = new URL(targetUrl);
  const b = await getBrowser();
  const page = await b.newPage();

  try {
    await page.goto(targetUrl, { waitUntil: "domcontentloaded", timeout: 30000 });
    await page.waitForTimeout(1200); // dropdown'ların render edilmesi için

    // Navbar içindeki tüm <a> etiketlerini çek
    const rawLinks = await page.evaluate(() => {
      const selectors = [
        "nav a", "header a",
        "[class*='menu'] a", "[class*='navbar'] a",
        "[class*='nav-'] a", "[id*='menu'] a", "[id*='nav'] a",
      ];
      const seen = new Set<string>();
      const links: { href: string; label: string }[] = [];

      for (const sel of selectors) {
        document.querySelectorAll<HTMLAnchorElement>(sel).forEach((el) => {
          const href = el.href || el.getAttribute("href") || "";
          const label = el.textContent?.trim().replace(/\s+/g, " ") || "";
          if (href && !seen.has(href)) {
            seen.add(href);
            links.push({ href, label });
          }
        });
      }
      return links;
    });

    // Filtrele ve temizle
    const seen = new Set<string>();
    const result: NavLink[] = [];

    for (const { href, label } of rawLinks) {
      if (!href) continue;
      if (SKIP_SCHEMES.some((s) => href.startsWith(s))) continue;

      let parsed: URL;
      try { parsed = new URL(href, targetUrl); } catch { continue; }

      // Sadece aynı domain
      if (parsed.hostname !== base.hostname) continue;

      const path = parsed.pathname.toLowerCase();

      // Atlanacak sayfalar
      if (SKIP_KEYWORDS.some((kw) => path.includes(kw))) continue;

      // Fragment ve trailing slash temizle
      parsed.hash = "";
      const normalized = parsed.toString().replace(/\/$/, "");

      if (seen.has(normalized)) continue;
      seen.add(normalized);

      result.push({ label: label || pathToLabel(parsed.pathname), url: normalized });
    }

    return result;
  } finally {
    await page.close();
  }
}

function pathToLabel(pathname: string): string {
  const last = pathname.split("/").filter(Boolean).pop() || "anasayfa";
  return last.replace(/[-_]/g, " ").replace(/\b\w/g, (c) => c.toUpperCase());
}