// The topology "disappears" for the user but passed my tests. Two suspects in
// index.html:
//   1. The Topology tab button calls `showView('topo'); loadTopo()`, and
//      showView ITSELF calls loadTopo() when v==='topo' -> two concurrent calls.
//   2. ensureTopoGraph() assigns `topoGraph = new TopoGraph(host)` BEFORE awaiting
//      init(), but the guard is `if (topoGraph && topoGraph.app)` — and app is
//      null until init() finishes. A second concurrent call therefore builds a
//      SECOND renderer. Both run host.innerHTML = '' and append their own canvas,
//      so whichever init() finishes LAST wins the DOM while `topoGraph` still
//      points at the other one -> a canvas that is running but detached from the
//      page, i.e. nothing visible.
// Hammer the tab exactly like a user clicking it, and check how many canvases
// exist and which one the bridge holds.
const { chromium } = require('/tmp/gltest/node_modules/playwright-core');

const BASE = process.env.PANEL_URL || 'https://panel.attackdefense.imrnes.team';

(async () => {
  const browser = await chromium.launch({
    args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-unsafe-swiftshader'],
  });
  const page = await browser.newPage({ viewport: { width: 1400, height: 900 } });
  const errs = [];
  page.on('pageerror', e => errs.push('PAGEERROR: ' + e.message));
  page.on('console', m => { if (m.type() === 'error') errs.push('CONSOLE: ' + m.text()); });

  const creds = require('fs').readFileSync('/opt/gemastik18-final/panel/.env', 'utf8')
    .split('\n').reduce((a, l) => {
      const m = l.match(/^PANEL_ADMIN_(USER|PASS)=(.*)$/);
      if (m) a[m[1]] = m[2];
      return a;
    }, {});

  await page.goto(BASE + '/login', { waitUntil: 'domcontentloaded' });
  await page.fill('#u', creds.USER);
  await page.fill('#p', creds.PASS);
  await page.click('#f button[type=submit]');
  await page.waitForSelector('#view-challs.active');

  // Count how many times the module actually initialises a renderer.
  await page.evaluate(() => {
    window.__inits = 0;
    const host = document.getElementById('topoHost');
    const mo = new MutationObserver(() => { /* canvas churn visible below */ });
    mo.observe(host, { childList: true });
    window.__mo = mo;
  });

  console.log('=== single tab click (what my tests did) ===');
  await page.click('.tab[data-view=topo]');
  await page.waitForTimeout(2500);
  let s = await page.evaluate(() => {
    const host = document.getElementById('topoHost');
    const g = window.__topoProbe ? window.__topoProbe() : null;
    return {
      canvases: host.querySelectorAll('canvas').length,
      hostChildren: host.children.length,
      bridgeHasApp: !!(g && g.app),
      bridgeCanvasAttached: !!(g && g.app && g.app.canvas && g.app.canvas.isConnected),
      nodes: g ? g.nodeViews.size : -1,
    };
  });
  console.log('  ', JSON.stringify(s));

  console.log('\n=== rapid re-entry (leave tab, come back, x3) ===');
  for (let i = 0; i < 3; i++) {
    await page.click('.tab[data-view=challs]');
    await page.waitForTimeout(120);
    await page.click('.tab[data-view=topo]');
    await page.waitForTimeout(900);
    const t = await page.evaluate(() => {
      const host = document.getElementById('topoHost');
      const g = window.__topoProbe ? window.__topoProbe() : null;
      return {
        canvases: host.querySelectorAll('canvas').length,
        hostChildren: host.children.length,
        bridgeCanvasAttached: !!(g && g.app && g.app.canvas && g.app.canvas.isConnected),
        nodes: g ? g.nodeViews.size : -1,
      };
    });
    console.log(`  round ${i + 1}:`, JSON.stringify(t));
  }

  console.log('\n=== final pixel check on the VISIBLE canvas ===');
  const r = await page.evaluate(() => {
    const host = document.getElementById('topoHost');
    const cv = host.querySelector('canvas');
    if (!cv) return { error: 'no canvas in host at all' };
    const g = window.__topoProbe();
    const rd = g.app.renderer;
    rd.render(g.app.stage);
    const W = rd.width, H = rd.height;
    const buf = new Uint8Array(W * H * 4);
    rd.gl.readPixels(0, 0, W, H, rd.gl.RGBA, rd.gl.UNSIGNED_BYTE, buf);
    let nonBg = 0;
    for (let i = 0; i < buf.length; i += 4)
      if (Math.max(Math.abs(buf[i]-10), Math.abs(buf[i+1]-15), Math.abs(buf[i+2]-28)) > 3) nonBg++;
    return {
      bridgeCanvasIsTheVisibleOne: cv === g.app.canvas,
      pct: +(100 * nonBg / (W * H)).toFixed(2),
      visibleCanvasW: cv.width, bridgeCanvasW: rd.width,
    };
  });
  console.log('  ', JSON.stringify(r));
  if (errs.length) { console.log('\n  errors:'); errs.slice(0, 6).forEach(e => console.log('   ' + e)); }
  await browser.close();
})();