// Persistent YouTube ad auto-skipper for the broadcast Chrome. Connects over
// CDP and injects a small watcher into every tab (current and future). The
// watcher clicks the "Skip ad" button the instant it appears, closes overlay
// ads, and fast-forwards unskippable ads (seek to end + 16x + mute) so they are
// gone in ~1s. Self-contained: no extension, no network/hosts changes.
//
//   node bot/scripts/stream-test/ad-skip.mjs   (CDP_PORT, default 9222)
import { chromium } from 'playwright';

const CDP = process.env.CDP_PORT || '9222';

const WATCH = `(() => {
  if (window.__ytAdSkip) return; window.__ytAdSkip = true;
  const tick = () => {
    try {
      const p = document.getElementById('movie_player');
      const adShowing = !!(p && p.classList && p.classList.contains('ad-showing'));
      // 1) click any skip button
      const skip = document.querySelector(
        '.ytp-ad-skip-button, .ytp-ad-skip-button-modern, .ytp-skip-ad-button, .ytp-ad-skip-button-container button');
      if (skip) skip.click();
      // 2) close overlay/banner ads
      document.querySelectorAll('.ytp-ad-overlay-close-button, .ytp-ad-overlay-close-container button').forEach((b) => b.click());
      // 3) fast-forward an unskippable ad
      const v = document.querySelector('video');
      if (v) {
        if (adShowing) {
          v.muted = true;
          if (isFinite(v.duration) && v.duration > 0) { try { v.currentTime = v.duration; } catch {} }
          v.playbackRate = 16;
        } else if (v.playbackRate > 2) {
          v.playbackRate = 1; // restore after the ad
        }
      }
    } catch {}
  };
  setInterval(tick, 250);
})();`;

async function arm(page) {
  try { await page.addInitScript(WATCH); } catch {}        // survives navigations
  try { await page.evaluate(WATCH); } catch {}             // arm the already-loaded doc
}

async function session() {
  const b = await chromium.connectOverCDP(`http://localhost:${CDP}`);
  const ctx = b.contexts()[0];
  for (const p of ctx.pages()) await arm(p);
  ctx.on('page', arm);                                     // new tabs
  console.log('ad-skip armed on', ctx.pages().length, 'tab(s)');
  await new Promise((resolve) => b.on('disconnected', resolve)); // until Chrome goes away
}

// Reconnect across Chrome restarts so the broadcast stays ad-free.
while (true) {
  try { await session(); } catch (e) { /* CDP down */ }
  await new Promise((r) => setTimeout(r, 3000));
}