// Proves the caption tracks actually load and follow the member's chosen language.
//
// A .vtt served with the wrong Content-Type is silently ignored by the browser, and a
// track that fails to parse shows zero cues with no error anywhere. So checking the
// markup is not enough: this reads the parsed cues back out of the player itself.
//
// Run: LOCAL=http://127.0.0.1:3399 node qa/captions-e2e.mjs
//      LOCAL=https://rmcircle.team node qa/captions-e2e.mjs
import { pathToFileURL } from 'node:url';
import fs from 'node:fs';
const PW = 'D:/Projects/MarketingAgent/qa-tester/node_modules/playwright';
const { chromium } = (await import(pathToFileURL(PW + '/index.js').href)).default;
const B = process.env.LOCAL || 'http://127.0.0.1:3399';
const ok = [], bad = [];
const t = (n, c, extra) => { (c ? ok : bad).push(n + (c || !extra ? '' : '  -> ' + extra)); };

// the captioned set is whatever training.html actually wires up, so this suite follows
// the page rather than a list that can drift out of date
const html = fs.readFileSync('public/training.html', 'utf8');
const players = [];
for (const m of html.matchAll(/<video[^>]*src="([^"]+\.mp4)"[^>]*>([\s\S]*?)<\/video>/g)) {
  const langs = [...m[2].matchAll(/srclang="([a-z]+)"[^>]*src="([^"]+)"/g)].map(x => ({ lang: x[1], src: x[2] }));
  if (langs.length) players.push({ video: m[1], langs });
}
t('training.html wires up captioned players', players.length > 0, String(players.length));
console.log('captioned players: ' + players.length);

// 1. every referenced file is served as real VTT with real cues
for (const p of players) {
  for (const { lang, src } of p.langs) {
    const r = await fetch(B + src);
    const ct = r.headers.get('content-type') || '';
    const body = r.ok ? await r.text() : '';
    const cues = (body.match(/-->/g) || []).length;
    t(src.split('/').pop() + ' served as text/vtt with cues',
      r.ok && /text\/vtt/.test(ct) && body.startsWith('WEBVTT') && cues > 10,
      r.status + ' ' + ct + ' cues=' + cues);
  }
}

const browser = await chromium.launch();
const load = async lang => {
  const ctx = await browser.newContext({ viewport: { width: 1280, height: 900 } });
  await ctx.addInitScript(l => {
    try { if (l) localStorage.setItem('rmc.lang', l); } catch (e) {}
    // the event flyer covers the page and is not what this suite tests
    const g = Storage.prototype.getItem;
    Storage.prototype.getItem = function (k) {
      if (/^rmc-promo-/.test(k)) return 'seen';
      if (/^rmc-announce-/.test(k)) return 'done';
      return g.call(this, k);
    };
  }, lang);
  const page = await ctx.newPage();
  await page.goto(B + '/training', { waitUntil: 'domcontentloaded' });
  await page.waitForTimeout(3000);
  return { ctx, page };
};
const read = page => page.evaluate(() => Array.from(document.querySelectorAll('video')).map(v => ({
  src: v.getAttribute('src'),
  tracks: Array.from(v.textTracks).map(tr => ({ lang: tr.language, mode: tr.mode, cues: tr.cues ? tr.cues.length : 0,
    first: tr.cues && tr.cues[0] ? tr.cues[0].text : '' }))
})));

// 2. an English member: tracks are available but nothing is forced over the picture
let { ctx, page } = await load(null);
let vids = await read(page);
for (const p of players) {
  const v = vids.find(x => x.src === p.video);
  t('player has its tracks: ' + p.video.split('/').pop(), !!v && v.tracks.length === p.langs.length,
    v ? String(v.tracks.length) : 'player not found');
  t('nothing forced on for an English member: ' + p.video.split('/').pop(),
    !!v && v.tracks.every(x => x.mode !== 'showing'), v && JSON.stringify(v.tracks.map(x => x.mode)));
}
await ctx.close();

// 3. each translated language: that track shows, parses, and is not English passthrough
const ENGLISH_OPENERS = /^(Most team builds|Welcome|Hey|In this video|Alright|So )/i;
for (const lang of ['it', 'fr', 'es', 'de', 'pt']) {
  ({ ctx, page } = await load(lang));
  await page.waitForTimeout(1500);
  vids = await read(page);
  for (const p of players) {
    if (!p.langs.some(l => l.lang === lang)) continue;
    const v = vids.find(x => x.src === p.video);
    const tr = v && v.tracks.find(x => x.lang === lang);
    const name = p.video.split('/').pop().slice(0, 30);
    t(lang + ': showing on ' + name, !!tr && tr.mode === 'showing', tr ? tr.mode : 'track missing');
    t(lang + ': cues parsed on ' + name, !!tr && tr.cues > 10, tr ? String(tr.cues) : '-');
    t(lang + ': not English passthrough on ' + name, !!tr && !ENGLISH_OPENERS.test(tr.first), tr && tr.first.slice(0, 50));
    t(lang + ': English not also showing on ' + name,
      !!v && v.tracks.every(x => x.lang === lang || x.mode !== 'showing'), v && JSON.stringify(v.tracks.map(x => x.lang + ':' + x.mode)));
  }
  await ctx.close();
}

// 4. DISCOVERABILITY. Marty could not find the captions on his own page because the
// native CC button is tiny and nothing switches on for an English reader. A feature
// nobody can find is not shipped, so every captioned player must carry visible chips.
({ ctx, page } = await load(null));
const bars = await page.evaluate(() => Array.from(document.querySelectorAll('video')).map(v => {
  const bar = v.parentNode && v.parentNode.querySelector('.cap-bar');
  return { src: v.getAttribute('src'), has: !!bar, labels: bar ? Array.from(bar.querySelectorAll('button[data-lang]')).map(b => b.textContent) : [] };
}));
for (const p of players) {
  const b = bars.find(x => x.src === p.video);
  const name = p.video.split('/').pop().slice(0, 30);
  t('visible subtitle chips on ' + name, !!b && b.has, 'no .cap-bar');
  t('chips cover every track plus Off on ' + name, !!b && b.labels.length === p.langs.length + 1, b && b.labels.join(','));
  t('chips are named in their own language on ' + name, !!b && b.labels.includes('Italiano') && b.labels.includes('Deutsch'), b && b.labels.join(','));
}
// clicking a chip switches the track for an English reader who wants one
await page.click('.cap-bar button[data-lang="pt"]').catch(() => {});
await page.waitForTimeout(900);
const afterClick = await read(page);
const firstWithTracks = afterClick.find(v => v.tracks.length);
t('clicking a chip turns that language on', !!firstWithTracks && firstWithTracks.tracks.some(x => x.lang === 'pt' && x.mode === 'showing'),
  firstWithTracks && JSON.stringify(firstWithTracks.tracks.map(x => x.lang + ':' + x.mode)));
await page.click('.cap-bar button[data-lang=""]').catch(() => {});
await page.waitForTimeout(700);
const afterOff = await read(page);
const off = afterOff.find(v => v.tracks.length);
t('"Off" turns captions back off', !!off && off.tracks.every(x => x.mode !== 'showing'),
  off && JSON.stringify(off.tracks.map(x => x.mode)));
await ctx.close();

console.log('PASS ' + ok.length);
for (const b of bad) console.log('FAIL ' + b);
await browser.close();
process.exit(bad.length ? 1 : 0);