const preparePage = async (chromium, { tabIndex = Number(process.env.TAB_INDEX), endpoint = process.env.CDP_ENDPOINT || 'http://127.0.0.1:9222' } = {}) => {
  const browser = await chromium.connectOverCDP(endpoint);
  const context = browser.contexts()[0];

  if (!context) {
    throw new Error('No browser context available');
  }

  await context.addInitScript(() => {
    Object.defineProperty(navigator, 'webdriver', { get: () => undefined });
  });

  const idx = Number.isFinite(tabIndex) && tabIndex >= 0 ? Math.floor(tabIndex) : 0;
  let pages = await context.pages();

  while (pages.length <= idx) {
    await context.newPage();
    pages = await context.pages();
  }

  const page = pages[idx];
  await page.bringToFront();

  return { browser, context, page };
};

const safeDisconnectBrowser = async (browser) => {
  if (!browser) return;
  
  try {
    if (typeof browser.disconnect === 'function') {
      await browser.disconnect();
    } else {
      await browser.close();
    }
  } catch {}
};

module.exports = {
  preparePage,
  safeDisconnectBrowser,
};