// The end of the pager: swiping past the last clip (when the next isn't in
// yet) lands on a "fetching the next video" screen, not a nudge that goes
// nowhere; the clip left behind stops; the next clip, when it arrives, is
// moved onto and plays by itself. With nothing older to be had, the end says
// that's everything. Escape from there lands on the last clip's post.
// Run: bun tools/pager-tail-test.js   (SHOT=path.png saves the loading screen)
import puppeteer from './puppeteer.js';
import { cacheKeyFor } from '../src/wallet.js';
import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure';
import { buildHtml } from '../build.js';
import { existsSync } from 'node:fs';
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
let ok = true;
const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; };
const CLIP = '/tmp/coinos-tail-clip.webm';
if (!existsSync(CLIP)) Bun.spawnSync(['ffmpeg', '-y', '-loglevel', 'error', '-f', 'lavfi', '-i', 'testsrc=size=180x320:rate=10', '-t', '20', '-c:v', 'libvpx', '-b:v', '100k', CLIP]);

const SK = generateSecretKey(), AUTHOR = getPublicKey(SK);
const now = Math.floor(Date.now() / 1000);
const post = (content, ago) => finalizeEvent({ kind: 1, created_at: now - ago, tags: [], content }, SK);
const html = await buildHtml({ minify: true, pwa: false });
const server = Bun.serve({ port: 0, fetch: (req) => {
  const path = new URL(req.url).pathname;
  if (/^\/c\d\.webm$/.test(path)) return new Response(Bun.file(CLIP), { headers: { 'content-type': 'video/webm' } });
  if (path.startsWith('/punks') || path === '/verify-worker.js') return new Response(Bun.file('dist' + path));
  return new Response(html, { headers: { 'content-type': 'text/html' } });
} });
const U = (n) => server.url.origin + '/' + n + '.webm';
// what the phone has: two clips among words; what only the relays have (slowly): two older clips
const cached = [
  post('clip zero ' + U('c0'), 100), post('words between ' + 'lorem ipsum. '.repeat(6), 200), post('clip one ' + U('c1'), 300),
];
const older = [post('clip two ' + U('c2'), 5000), post('more words ' + 'lorem ipsum. '.repeat(6), 5100), post('clip three ' + U('c3'), 5200)];

const browser = await puppeteer.launch({ executablePath: '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox', '--autoplay-policy=no-user-gesture-required'] });
const page = await browser.newPage();
// The relays: the newest posts at once; anything asked for by age (until) comes 3 s later
await page.evaluateOnNewDocument(([fresh, old]) => {
  const all = [...fresh, ...old];
  const match = (f, e) => (!f.kinds || f.kinds.includes(e.kind)) && (!f.authors || f.authors.includes(e.pubkey)) && (!f.ids || f.ids.includes(e.id))
    && (!f.until || e.created_at <= f.until) && (!f.since || e.created_at >= f.since) && !Object.keys(f).some((k) => k.startsWith('#'));
  window.__olderAsks = 0;
  class FakeWS {
    constructor(url) { this.url = String(url); this.readyState = 0; setTimeout(() => { this.readyState = 1; this.onopen && this.onopen({}); }, 5); }
    send(raw) {
      const m = JSON.parse(raw);
      const reply = (x, ms = 5) => setTimeout(() => this.readyState === 1 && this.onmessage && this.onmessage({ data: JSON.stringify(x) }), ms);
      if (m[0] === 'REQ') {
        const filters = m.slice(2).filter((f) => !f.cache);
        const slow = filters.some((f) => f.until);
        if (slow) window.__olderAsks++;
        const pool = slow ? all : fresh;
        const ms = slow ? 3000 : 5;
        for (const f of filters) {
          const hits = pool.filter((e) => match(f, e)).sort((a, b) => b.created_at - a.created_at);
          for (const e of f.limit ? hits.slice(0, f.limit) : hits) reply(['EVENT', m[1], e], ms);
        }
        reply(['EOSE', m[1]], ms + 5);
      } else if (m[0] === 'EVENT') reply(['OK', m[1].id, true, '']);
      else if (m[0] === 'COUNT') reply(['COUNT', m[1], { count: 0 }]);
    }
    close() { this.readyState = 3; this.onclose && this.onclose({ code: 1000 }); }
    addEventListener(t, fn) { this['on' + t] = fn; }
    removeEventListener() {}
  }
  FakeWS.CONNECTING = 0; FakeWS.OPEN = 1; FakeWS.CLOSING = 2; FakeWS.CLOSED = 3;
  window.WebSocket = FakeWS;
}, [cached, older]);
const errs = [];
page.on('pageerror', (e) => errs.push(String(e)));
const click = (t) => page.evaluate((x) => { const e = [...document.querySelectorAll('button')].find((n) => n.textContent.trim().toLowerCase().includes(x)); if (e) { e.click(); return true; } return false; }, t);
const waitText = async (x, ms = 25000) => { for (let i = 0; i < ms / 250; i++) { if ((await page.evaluate(() => document.body.innerText)).toLowerCase().includes(x)) return true; await sleep(250); } return false; };
const waitFor = async (fn, arg, ms = 10000) => { for (let i = 0; i < ms / 100; i++) { if (await page.evaluate(fn, arg)) return true; await sleep(100); } return false; };
// what the pager rests on: a clip's name, or 'tail'
const AT = () => { const sc = document.querySelector('.mp-scroll'); if (!sc) return null; const s = [...sc.querySelectorAll('.mp-slide, .mp-tail')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; }); return !s ? 'between' : s.classList.contains('mp-tail') ? 'tail' : s.getAttribute('data-k').split('/').pop().replace('.webm', ''); };
const at = () => page.evaluate(AT);
const resting = (name, ms = 5000) => waitFor(([f, n]) => eval(f)() === n, ['(' + AT + ')', name], ms);
const playing = (name) => waitFor((n) => { const s = [...document.querySelectorAll('.mp-slide')].find((x) => (x.getAttribute('data-k') || '').endsWith('/' + n + '.webm')); const v = s && s.querySelector('video.mp-media'); return v && !v.paused && v.currentTime > 0; }, name, 6000);
const tail = () => page.evaluate(() => { const t = document.querySelector('.mp-tail'); return t ? { text: t.textContent.trim(), done: t.classList.contains('done'), last: t === t.parentElement.lastElementChild } : null; });

try {
  await page.setViewport({ width: 390, height: 844 });
  await page.goto(server.url.href, { waitUntil: 'domcontentloaded' });
  await page.evaluate(() => localStorage.setItem('btc-wallet-network', 'regtest'));
  await page.reload({ waitUntil: 'domcontentloaded' }); await sleep(400);
  await click('create a new wallet'); await sleep(600);
  await page.waitForSelector('.words .w .t');
  const mn = (await page.$$eval('.words .w .t', (l) => l.map((e) => e.textContent.trim()))).join(' ');
  await click('skip verification');
  await waitText('receive', 20000);
  const base = cacheKeyFor(mn + '\n');
  await page.evaluate(([k, pk, ns]) => {
    localStorage.setItem(k + ':follows', JSON.stringify({ tags: [['p', pk]], c: '', at: Math.floor(Date.now() / 1000) }));
    localStorage.setItem(k + ':feedNotes', JSON.stringify(ns));
    localStorage.setItem(k + ':profiles', JSON.stringify({ [pk]: { name: 'Tail Poster', t: Date.now() } }));
    localStorage.setItem('btc-wallet-feed:' + k, 'following');
  }, [base, AUTHOR, cached]);
  await page.reload({ waitUntil: 'domcontentloaded' });
  await waitText('receive', 20000);
  await page.evaluate(() => document.querySelector('.app-nav-button[aria-label="Feed"]').click());
  await page.waitForSelector('.notes-feed video.note-video', { timeout: 20000 });
  await sleep(1500);

  const r = await page.evaluate(() => { const row = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes('clip zero')); row.querySelector('video.note-video').scrollIntoView({ block: 'center' }); const b = row.querySelector('video.note-video').getBoundingClientRect(); return { x: b.x + b.width * 0.2, y: b.y + b.height * 0.3 }; });
  await sleep(400);
  await page.mouse.click(r.x, r.y);
  check('the pager opens on the first clip', await waitFor(() => !!document.querySelector('.media-pager.videos'), null, 4000) && await resting('c0'), await at());
  check('a loading screen waits at the end, after the clips', (await tail())?.last, JSON.stringify(await tail()));

  console.log('\n[past the last clip in: the loading screen, not a nudge]');
  await page.keyboard.press('ArrowDown');
  check('down: the second clip', await resting('c1'), await at());
  await playing('c1');
  await page.keyboard.press('ArrowDown');
  check('down again: the loading screen', await resting('tail', 2000), await at());
  const tl = await tail();
  check('…saying the next video is being fetched', /fetching the next video/i.test(tl.text) && !tl.done, JSON.stringify(tl));
  check('…the clip left behind stops', await page.evaluate(() => { const s = [...document.querySelectorAll('.mp-slide')].find((x) => (x.getAttribute('data-k') || '').endsWith('/c1.webm')); return s.querySelector('video.mp-media').paused; }));
  check('…and older posts are being asked for', await page.evaluate(() => window.__olderAsks > 0));
  if (process.env.SHOT) { await sleep(400); await page.screenshot({ path: process.env.SHOT }); }

  console.log('\n[the next clip arrives: moved onto, playing]');
  check('the pager moves onto it by itself', await resting('c2', 9000), await at());
  check('…and it plays', await playing('c2'));
  check('the loading screen is still last', (await tail())?.last);

  console.log('\n[nothing older: that\'s everything]');
  await page.keyboard.press('ArrowDown');
  check('down: the clip that came with it', await resting('c3'), await at());
  await page.keyboard.press('ArrowDown');
  check('down: the end again', await resting('tail', 2000), await at());
  check('…which says that\'s everything, once the relays have nothing older', await waitFor(() => { const t = document.querySelector('.mp-tail'); return t && t.classList.contains('done') && /everything/i.test(t.textContent); }, null, 20000), JSON.stringify(await tail()));
  check('…and stays put', (await at()) === 'tail');

  console.log('\n[Escape from the end]');
  await page.keyboard.press('Escape');
  check('the pager closes', await waitFor(() => !document.querySelector('.media-pager') && !!document.querySelector('.notes-feed'), null, 3000));
  await sleep(1500);
  const top = await page.evaluate(() => { const r = [...document.querySelectorAll('.notes-feed > [data-key]')].find((n) => n.textContent.includes('clip three')); return r ? Math.round(r.getBoundingClientRect().top) : null; });
  check('…onto the last clip\'s post', top !== null && top >= -10 && top < 120, 'row top ' + top);
  check('no page errors', errs.length === 0, errs.slice(0, 2).join(' | '));
} finally { await browser.close(); server.stop(true); }
console.log(ok ? '\n✅ the end of the pager fetches, shows it, and moves on when the next arrives' : '\n❌ failed');
process.exit(ok ? 0 : 1);