// A tap on a clip in the pager is a tap even if the finger moves a little:
// the browser takes a touch that moves a few pixels for a scroll (no click,
// and a quick one could fling the pager on). A touch that travels less than
// 30px pauses (or plays) the clip and leaves the pager where it was; only a
// longer one pages.
// Run: bun tools/pager-tap-slop-test.js
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 = (name, size) => {
  const f = '/tmp/coinos-vpager-' + name + '.webm';
  if (!existsSync(f)) Bun.spawnSync(['ffmpeg', '-y', '-loglevel', 'error', '-f', 'lavfi', '-i', 'testsrc=size=' + size + ':rate=10', '-t', '30', '-c:v', 'libvpx', '-b:v', '100k', f]);
  return f;
};
const CLIPS = { wide: clip('wide', '320x180'), tall: clip('tall', '180x320'), last: clip('last', '240x240') };

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;
  const m = /^\/(wide|tall|last)\.webm$/.exec(path);
  if (m) return new Response(Bun.file(CLIPS[m[1]]), { 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';
const seeded = [
  post('a wide one ' + U('wide'), 100),
  post('a tall one ' + U('tall'), 200),
  post('only words here, nothing to watch', 300),
  post('the last clip ' + U('last'), 400),
  ...Array.from({ length: 10 }, (_, i) => post('filler ' + i + ' ' + 'lorem ipsum dolor sit amet. '.repeat(5), 500 + i * 60)),
];

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();
await page.evaluateOnNewDocument(() => {
  const Real = window.WebSocket;
  window.WebSocket = function (...a) { const ws = new Real(...a); const send = ws.send.bind(ws); ws.send = (d) => { try { const m = JSON.parse(d); if (m[0] === 'REQ') { setTimeout(() => ws.dispatchEvent(new MessageEvent('message', { data: JSON.stringify(['EOSE', m[1]]) })), 0); return; } if (m[0] === 'EVENT') return; } catch {} return send(d); }; return ws; };
  window.WebSocket.prototype = Real.prototype; Object.assign(window.WebSocket, Real);
  screen.orientation.lock = () => Promise.resolve(); screen.orientation.unlock = () => {};
});
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; };
const st = () => page.evaluate(() => { const s = [...document.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; }); const v = s && s.querySelector('video.mp-media'); return { on: s ? s.getAttribute('data-k').split('/').pop() : 'between', paused: v ? v.paused : null, show: !!document.querySelector('.media-pager.show') }; });
// a touch from (x, y) that moves dy (and dx) over a few steps, quickly
const drag = async (x, y, dx, dy, steps = 3) => {
  await page.touchscreen.touchStart(x, y);
  for (let i = 1; i <= steps; i++) { await page.touchscreen.touchMove(x + dx * i / steps, y + dy * i / steps); await sleep(16); }
  await page.touchscreen.touchEnd();
  await sleep(900);
};
try {
  await page.setViewport({ width: 390, height: 844, hasTouch: true });
  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: 'Clip Poster', t: Date.now() } }));
    localStorage.setItem('btc-wallet-feed:' + k, 'following');
  }, [base, AUTHOR, seeded]);
  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 page.evaluate(() => [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes('a tall one')).querySelector('video.note-video').scrollIntoView({ block: 'center' }));
  await sleep(1200);
  const at = await page.evaluate(() => { const b = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes('a tall one')).querySelector('video.note-video').getBoundingClientRect(); return { x: b.x + b.width * 0.2, y: b.y + b.height * 0.3 }; });
  await page.touchscreen.tap(at.x, at.y);
  check('the pager opens on the clip', await waitFor(() => !!document.querySelector('.media-pager.videos'), null, 4000));
  await waitFor(() => { const v = document.querySelector('.media-pager video[src]'); return v && !v.paused && v.currentTime > 0.5; }, null, 8000);
  await sleep(1000); // past the opening tap's own click
  let s = await st();
  check('it plays', s.on === 'tall.webm' && s.paused === false, JSON.stringify(s));

  console.log('\n[a tap whose finger drifts]');
  await drag(195, 420, 0, -18);
  s = await st();
  check('18px up: a tap — the clip pauses', s.paused === true, JSON.stringify(s));
  check('…on the slide it was on', s.on === 'tall.webm', JSON.stringify(s));
  await drag(195, 420, 6, 14);
  s = await st();
  check('14px down and a little across: a tap — it plays on, still there', s.paused === false && s.on === 'tall.webm', JSON.stringify(s));
  await drag(195, 420, 0, -20, 1);
  s = await st();
  check('a quick 20px flick: still a tap — paused, not paged', s.paused === true && s.on === 'tall.webm', JSON.stringify(s));
  await drag(195, 420, 0, 0, 1);
  s = await st();
  check('a still tap plays it again', s.paused === false && s.on === 'tall.webm', JSON.stringify(s));

  console.log('\n[a swipe is still a swipe]');
  await drag(195, 650, 0, -320, 8);
  s = await st();
  check('a 320px swipe up: the next post', s.on !== 'tall.webm' && s.on !== 'between', JSON.stringify(s));
  const was = s.on;
  await drag(195, 500, 0, 300, 8);
  s = await st();
  check('a 300px swipe down: back a post', s.on === 'tall.webm', JSON.stringify(s));
  // a slow, short drag (past a tap, short of a fifth of the screen): back where it was
  await page.touchscreen.touchStart(195, 500);
  for (let i = 1; i <= 10; i++) { await page.touchscreen.touchMove(195, 500 - 7 * i); await sleep(60); }
  await sleep(200); await page.touchscreen.touchEnd(); await sleep(900);
  s = await st();
  check('a slow 70px drag springs back', s.on === 'tall.webm', JSON.stringify(s));
  await drag(195, 500, 0, -80, 2);
  s = await st();
  check('a quick 80px flick up: the next post', s.on === was, JSON.stringify(s));
  await drag(195, 500, 0, 300, 8);
  await drag(195, 500, 0, -40, 2);
  s = await st();
  check('a quick 40px flick up: the next post too', s.on === was, JSON.stringify(s));
  await drag(195, 500, 0, 300, 8);
  await page.touchscreen.touchStart(195, 500);
  for (let i = 1; i <= 12; i++) { await page.touchscreen.touchMove(195, 500 - 9 * i); await sleep(30); }
  await page.touchscreen.touchEnd(); await sleep(900);
  s = await st();
  check('a steady 108px drag up (an eighth of the screen): the next post', s.on === was, JSON.stringify(s));

  console.log('\n[snappy: let go, and it lands at once]');
  await drag(195, 500, 0, 300, 8);
  await page.touchscreen.touchStart(195, 650);
  for (let i = 1; i <= 8; i++) { await page.touchscreen.touchMove(195, 650 - 40 * i); await sleep(16); }
  // from the finger lifting to the next slide resting square on the screen
  await page.evaluate(() => { window.__landed = new Promise((res) => { const t0 = performance.now(); const look = () => { const s = [...document.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 1 && Math.abs(r.left) < 1; }); if (s && !s.getAttribute('data-k').endsWith('/tall.webm')) res(Math.round(performance.now() - t0)); else if (performance.now() - t0 > 2000) res(-1); else requestAnimationFrame(look); }; requestAnimationFrame(look); }); });
  await page.touchscreen.touchEnd();
  const ms = await page.evaluate(() => window.__landed);
  check('a swipe lands on the next post within 250ms', ms > 0 && ms <= 250, ms + 'ms');

  console.log('\n[no overshoot: a post not quite a screen tall, as 100dvh can be on a phone]');
  await page.addStyleTag({ content: '.mp-group, .mp-tail { height: calc(100dvh + 12px) !important; }' });
  await page.evaluate(() => { document.querySelector('.mp-scroll').scrollTop = 0; });
  await sleep(600);
  // every frame's scroll, from the finger lifting until well after it lands
  const glide = async () => {
    await page.touchscreen.touchStart(195, 650);
    for (let i = 1; i <= 8; i++) { await page.touchscreen.touchMove(195, 650 - 40 * i); await sleep(16); }
    await page.evaluate(() => { const sc = document.querySelector('.mp-scroll'); window.__trace = []; const t0 = performance.now(); const rec = () => { window.__trace.push(sc.scrollTop); if (performance.now() - t0 < 900) requestAnimationFrame(rec); }; requestAnimationFrame(rec); });
    await page.touchscreen.touchEnd();
    await sleep(1100);
    return page.evaluate(() => { const sc = document.querySelector('.mp-scroll'); const tops = [...sc.querySelectorAll('.mp-group, .mp-tail')].map((g) => g.getBoundingClientRect().top); return { trace: window.__trace, off: Math.min(...tops.map(Math.abs)) }; });
  };
  for (let n = 1; n <= 2; n++) {
    const g = await glide();
    const end = g.trace[g.trace.length - 1];
    const past = Math.max(...g.trace.map((x) => x - end));
    const back = g.trace.some((x, i) => i && x < g.trace[i - 1] - 0.5);
    check('swipe ' + n + ': straight on to the post, never past it and back', past <= 1 && !back, g.trace[0].toFixed(1) + '→' + end.toFixed(1) + ', past by ' + past.toFixed(1) + 'px' + (back ? ', moved back' : ''));
    check('…resting square on it', g.off < 1, g.off.toFixed(2) + 'px off');
  }
  check('no page errors', errs.length === 0, errs.slice(0, 2).join(' | '));
} finally { await browser.close(); server.stop(true); }
console.log(ok ? '\n✅ a little movement is still a tap' : '\n❌ failed');
process.exit(ok ? 0 : 1);