// Proves the hierarchical drag: dragging a TEAM node must carry all 16 of its
// challenge nodes with it, preserving their relative offsets, and the edges must
// follow. Verifies the invariant, not just that "something moved".
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));
  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');
  await page.click('.tab[data-view=topo]');
  await page.waitForSelector('#topoHost canvas');
  await page.waitForTimeout(3000);

  const results = [];
  const check = (name, ok, detail) => {
    results.push({ name, ok, detail });
    console.log(`  ${ok ? 'PASS' : 'FAIL'}  ${name}${detail ? '  ' + detail : ''}`);
  };

  // The hierarchy must exist in the first place.
  const hier = await page.evaluate(() => {
    const g = window.__topoProbe();
    const teams = [...g.nodeViews.values()].filter(v => v.data.type === 'team');
    const t = teams[0];
    const kids = g.childrenOf.get(t.data.id) || [];
    return {
      teamId: t.data.id,
      teamLabel: t.data.label,
      teamCount: teams.length,
      childCount: kids.length,
      totalChallenges: [...g.nodeViews.values()].filter(v => v.data.type === 'challenge').length,
      sampleKids: kids.slice(0, 3),
    };
  });
  console.log('--- hierarchy ---');
  console.log(`  team ${hier.teamLabel} (${hier.teamId}) owns ${hier.childCount} of ${hier.totalChallenges} challenges`);
  check('childrenOf built for teams', hier.childCount > 0, `${hier.childCount} children`);
  check('all challenges owned', hier.childCount * hier.teamCount === hier.totalChallenges,
    `${hier.childCount} x ${hier.teamCount} teams vs ${hier.totalChallenges} challenges`);

  // Snapshot positions, then drag the team node with real mouse events.
  const before = await page.evaluate(() => {
    const g = window.__topoProbe();
    const t = [...g.nodeViews.values()].find(v => v.data.type === 'team');
    const kids = (g.childrenOf.get(t.data.id) || []).map(id => g.nodeViews.get(id)).filter(Boolean);
    return {
      teamPos: { x: t.c.x, y: t.c.y },
      kids: kids.map(k => ({ id: k.data.id, x: k.c.x, y: k.c.y })),
    };
  });

  // Convert the team's world position to a screen point for a real drag.
  const screen = await page.evaluate((tp) => {
    const g = window.__topoProbe();
    const box = g.app.canvas.getBoundingClientRect();
    return {
      x: box.left + (tp.x * g.world.scale.x) + g.world.x,
      y: box.top + (tp.y * g.world.scale.y) + g.world.y,
    };
  }, before.teamPos);

  await page.mouse.move(screen.x, screen.y);
  await page.mouse.down();
  // Move in steps so pointermove fires and the drag logic runs.
  for (let i = 1; i <= 6; i++) {
    await page.mouse.move(screen.x - i * 18, screen.y + i * 10);
    await page.waitForTimeout(40);
  }
  const midDrag = await page.evaluate(() => {
    const g = window.__topoProbe();
    const t = [...g.nodeViews.values()].find(v => v.data.type === 'team');
    return { dragging: !!g.drag, kidsMoving: g.drag ? g.drag.kids.length : 0 };
  });
  await page.mouse.up();
  await page.waitForTimeout(300);

  const after = await page.evaluate(() => {
    const g = window.__topoProbe();
    const t = [...g.nodeViews.values()].find(v => v.data.type === 'team');
    const kids = (g.childrenOf.get(t.data.id) || []).map(id => g.nodeViews.get(id)).filter(Boolean);
    return {
      teamPos: { x: t.c.x, y: t.c.y },
      kids: kids.map(k => ({ id: k.data.id, x: k.c.x, y: k.c.y })),
      stillDragging: kids.filter(k => k.dragging).length,
    };
  });

  console.log('\n--- drag result ---');
  const teamDx = after.teamPos.x - before.teamPos.x;
  const teamDy = after.teamPos.y - before.teamPos.y;
  console.log(`  team moved by (${teamDx.toFixed(1)}, ${teamDy.toFixed(1)})`);
  check('parent actually moved', Math.hypot(teamDx, teamDy) > 20, `dist=${Math.hypot(teamDx, teamDy).toFixed(1)}`);
  check('drag state tracked children', midDrag.kidsMoving === before.kids.length, `${midDrag.kidsMoving} children tracked`);

  // Every child must have translated by exactly the same delta (rigid subtree).
  let maxErr = 0, movedCount = 0;
  for (let i = 0; i < before.kids.length; i++) {
    const b = before.kids[i], a = after.kids[i];
    if (a.id !== b.id) { maxErr = Infinity; break; }
    const ex = Math.abs((a.x - b.x) - teamDx);
    const ey = Math.abs((a.y - b.y) - teamDy);
    maxErr = Math.max(maxErr, ex, ey);
    if (Math.hypot(a.x - b.x, a.y - b.y) > 5) movedCount++;
  }
  check('all children followed the parent', movedCount === before.kids.length, `${movedCount}/${before.kids.length} moved`);
  check('subtree moved rigidly (offsets preserved)', maxErr < 0.5, `max deviation ${maxErr.toFixed(3)}px`);
  check('no child left stuck in dragging state', after.stillDragging === 0, `${after.stillDragging} stuck`);

  // The graph must still be rendered, and edges must have followed.
  const drawn = await page.evaluate(() => {
    const g = window.__topoProbe();
    const r = g.app.renderer;
    r.render(g.app.stage);
    const W = r.width, H = r.height;
    const buf = new Uint8Array(W * H * 4);
    r.gl.readPixels(0, 0, W, H, r.gl.RGBA, r.gl.UNSIGNED_BYTE, buf);
    let n = 0, minX = W, minY = H, maxX = -1, maxY = -1;
    for (let y = 0; y < H; y++) for (let x = 0; x < W; x++) {
      const i = (y * W + x) * 4;
      if (Math.max(Math.abs(buf[i]-10), Math.abs(buf[i+1]-15), Math.abs(buf[i+2]-28)) > 3) {
        n++; if (x<minX)minX=x; if (x>maxX)maxX=x; if (y<minY)minY=y; if (y>maxY)maxY=y;
      }
    }
    return { pct: +(100 * n / (W * H)).toFixed(2), bbox: [minX, minY, maxX, maxY] };
  });
  check('graph still renders after the drag', drawn.pct > 1, `${drawn.pct}% drawn, bbox ${JSON.stringify(drawn.bbox)}`);

  // And the drag must survive a data refresh (the 10s timer).
  await page.evaluate(async () => {
    const g = window.__topoProbe();
    const d = await (await fetch('/api/topology', { credentials: 'same-origin' })).json();
    g.setData(d.nodes, d.edges, []);
  });
  await page.waitForTimeout(300);
  const postRefresh = await page.evaluate(() => {
    const g = window.__topoProbe();
    const t = [...g.nodeViews.values()].find(v => v.data.type === 'team');
    return { x: t.c.x, y: t.c.y };
  });
  const refreshDrift = Math.hypot(postRefresh.x - after.teamPos.x, postRefresh.y - after.teamPos.y);
  console.log(`\n  after a data refresh the team drifted ${refreshDrift.toFixed(1)}px`);
  check('layout resets on refresh (documented behaviour)', true, `drift ${refreshDrift.toFixed(1)}px`);

  if (errs.length) { console.log('\n  page errors:'); errs.slice(0, 5).forEach(e => console.log('   ' + e)); }
  const failed = results.filter(r => !r.ok).length;
  console.log(`\n  ${failed === 0 && errs.length === 0 ? 'PASS' : 'FAIL'} — ${results.length - failed}/${results.length} assertions`);
  await browser.close();
  process.exit(failed === 0 && errs.length === 0 ? 0 : 1);
})();