#!/usr/bin/env node
/** Reproducible browser benchmark and report producer for HP-PERF-01. */
import { execFileSync } from 'node:child_process';
import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
import { dirname, resolve } from 'node:path';
import { launch } from './serve.mjs';
import { LARGE_HOUSE_COUNTS, makeLargeHouseFixture } from './fixtures/large-house.mjs';
import { assertFreshDemoBundle } from './bundle-freshness.mjs';
import { ensureHarnessEditorRuntime } from './editor-runtime-compat.mjs';
import { summarizeLongTasks, summarizeTimings } from './performance/evaluate.mjs';
import { assertCardContract, LARGE_HOUSE_CARD_CONTRACT } from './performance/card-contract.mjs';
import {
  ISOMETRIC_STAGE3_DENSE_PROFILE,
  makeIsometricStage3DenseFixture,
} from './performance/isometric-stage3-dense-fixture.mjs';

const valueArg = (name) => process.argv.find((arg) => arg.startsWith(`--${name}=`))?.slice(name.length + 3);
const samples = Math.max(1, Math.min(20, Number(valueArg('samples')) || 7));
const warmups = Math.max(0, Math.min(5, Number(valueArg('warmups')) || 1));
const output = valueArg('output') ? resolve(valueArg('output')) : null;
const targetRoot = resolve(valueArg('target-root') ?? '.');
const profile = valueArg('profile') ?? 'large-house-v1';
if (![
  'large-house-v1', 'large-house-isometric-v1', ISOMETRIC_STAGE3_DENSE_PROFILE,
  'large-house-plan-snap-v1', 'large-house-interaction-v1',
].includes(profile))
  throw new Error(`unknown large-house profile: ${profile}`);
const stage3Dense = profile === ISOMETRIC_STAGE3_DENSE_PROFILE;
const allowStage2Base = process.argv.includes('--allow-stage2-base');
if (allowStage2Base && !stage3Dense)
  throw new Error('--allow-stage2-base is valid only for the Stage 3 dense profile');
const requireStage3 = stage3Dense && !allowStage2Base;
const isometric = profile === 'large-house-isometric-v1' || stage3Dense;
const planSnap = profile === 'large-house-plan-snap-v1';
const interaction = profile === 'large-house-interaction-v1';
const requiresIsometric = isometric && existsSync(resolve(targetRoot, 'src/iso-projection.ts'));
const requiresIsoStructuralBuildCounter = requiresIsometric
  && readFileSync(resolve(targetRoot, 'src/houseplan-card.ts'), 'utf8')
    .includes('private _isoStructuralBuildCount');
const requiresPlanSnap = planSnap && existsSync(resolve(targetRoot, 'src/plan-snap-overlay.ts'));
const requiresWallFace = planSnap && existsSync(resolve(targetRoot, 'src/wall-face-graph.ts'));
const requiresInteraction = interaction && existsSync(resolve(targetRoot, 'src/live-viewport.ts'));
const fixture = stage3Dense ? makeIsometricStage3DenseFixture() : makeLargeHouseFixture();
const fixtureCounts = stage3Dense ? fixture.counts : LARGE_HOUSE_COUNTS;
const sourceSha = (() => {
  try {
    return execFileSync('git', ['-C', targetRoot, 'rev-parse', 'HEAD'], { encoding: 'utf8' }).trim();
  } catch {
    return null;
  }
})();
if (isometric && !sourceSha)
  throw new Error(`${profile} requires an exact git source SHA`);
if (planSnap) {
  for (const [floor, space] of fixture.config.spaces.entries()) {
    space.partitions ||= [];
    for (const chain of [0, 1]) {
      const y = 0.985 + chain * 0.025;
      space.partitions.push(
        { id: `perf-chain-${floor}-${chain}-0`, a: [0.10, y], b: [0.38, y], cm: 15 },
        { id: `perf-chain-${floor}-${chain}-1`, a: [0.38, y], b: [0.46, y + 0.035], cm: 20 },
      );
    }
  }
  fixture.counts = { ...fixture.counts, chainSegments: 12, pointerMoves: 120 };
}
const viewport = { width: 1440, height: 1000 };

const { page, browser } = await launch(
  viewport,
  1,
  ['--enable-precise-memory-info', '--js-flags=--expose-gc'],
  {},
  resolve(targetRoot, 'demo/srv'),
  targetRoot,
);
await page.emulateMedia({ reducedMotion: 'reduce' });
await page.addStyleTag({
  content: '*,*::before,*::after{animation-duration:0s!important;transition-duration:0s!important;caret-color:transparent!important}',
});
await page.addScriptTag({
  content: `window.__hpAssertCardContract = ${assertCardContract.toString()};`,
});
await page.addScriptTag({
  content: `window.__hpEnsureHarnessEditorRuntime = ${ensureHarnessEditorRuntime.toString()};`,
});
const chromium = await browser.version();
let buildFingerprint;
try {
  buildFingerprint = await assertFreshDemoBundle(page, targetRoot);
} catch (error) {
  await browser.close();
  throw error;
}

const rows = [];
try {
  for (let iteration = 0; iteration < warmups + samples; iteration++) {
    const measuredSample = iteration - warmups;
    const row = await page.evaluate(async ({
      fixture, sample, cardContract, isometric, requiresIsometric, planSnap, requiresPlanSnap,
      requiresWallFace, interaction, requiresInteraction, stage3Dense, requireStage3,
      requiresIsoStructuralBuildCounter, profile,
    }) => {
      const frame = () => new Promise((done) => requestAnimationFrame(() => requestAnimationFrame(done)));
      const until = async (predicate, timeout = 10000) => {
        const started = performance.now();
        while (!predicate()) {
          if (performance.now() - started > timeout) throw new Error('large-house benchmark timed out');
          await new Promise((done) => setTimeout(done, 10));
        }
      };
      const startLongTaskWindow = () => {
        const entries = [];
        if (!PerformanceObserver.supportedEntryTypes?.includes('longtask')) {
          return { stop: async () => ({ supported: false, count: 0, maxMs: 0, totalMs: 0 }) };
        }
        const observer = new PerformanceObserver((list) => entries.push(...list.getEntries()));
        observer.observe({ type: 'longtask', buffered: false });
        return {
          stop: async () => {
            await new Promise((done) => setTimeout(done, 0));
            entries.push(...observer.takeRecords());
            observer.disconnect();
            const durations = entries.map((entry) => entry.duration);
            return {
              supported: true,
              count: durations.length,
              maxMs: Number((durations.length ? Math.max(...durations) : 0).toFixed(2)),
              totalMs: Number(durations.reduce((sum, value) => sum + value, 0).toFixed(2)),
            };
          },
        };
      };
      const duration = async (action) => {
        const longTasks = startLongTaskWindow();
        const started = performance.now();
        await action();
        await frame();
        return {
          ms: Number((performance.now() - started).toFixed(2)),
          longTasks: await longTasks.stop(),
        };
      };
      // Current candidates split the experimental Iso runtime out of the initial graph. Comparison
      // bundles remain valid: their older monolithic renderer has no preload
      // hook and is already available synchronously.
      const ensureIsoRuntime = async (card) => {
        if (typeof card._ensureIsoSceneRuntime !== 'function') return;
        if (!(await card._ensureIsoSceneRuntime()))
          throw new Error(`${profile} isometric runtime did not load`);
        await card.updateComplete;
      };
      const forceGc = async () => {
        if (typeof globalThis.gc !== 'function') return false;
        globalThis.gc();
        await frame();
        globalThis.gc();
        await frame();
        return true;
      };
      const cacheSnapshot = (card) => ({
        cleanFloor: card._cleanFloorCache?.size ?? 0,
        glowClip: card._glowClipCache?.size ?? 0,
        wallUnion: card._wallUnionCache ? 1 : 0,
        openingTunnel: card._openingTunnelCache ? 1 : 0,
        openingWallIndex: card._openingWallIndexCache ? 1 : 0,
        isoGeometry: card._isoGeometryCache?.size ?? 0,
        planSnapGeometry: card._planSnapGeometryCache ? 1 : 0,
        wallFaceGraph: card._wallFaceGraphCache?.length ?? 0,
      });
      const isoStructuralBuildCount = (card) => Number.isFinite(card._isoStructuralBuildCount)
        ? card._isoStructuralBuildCount : null;
      const stage3Snapshot = (card) => {
        const stage = card.renderRoot.querySelector('.stage');
        // Count the interactive HTML owners, not the diagnostic SVG
        // ground/tether/plate primitives which deliberately repeat kind/id.
        const overlayRoots = [...card.renderRoot.querySelectorAll(
          '[data-hp-iso-overlay-kind][data-hp-iso-floor][data-hp-iso-visual]',
        )];
        const overlaySelectors = {
          device: '[data-hp="device"]',
          'room-label': '[data-hp="room-label"]',
          'opening-lock': '.oplock',
        };
        const totalRootsByKind = Object.fromEntries(Object.entries(overlaySelectors)
          .map(([kind, selector]) => [kind, card.renderRoot.querySelectorAll(selector).length]));
        const stage3RootsByKind = Object.fromEntries(Object.keys(overlaySelectors)
          .map((kind) => [kind, overlayRoots.filter((root) =>
            root.getAttribute('data-hp-iso-overlay-kind') === kind).length]));
        const openingSurfaceCounts = Object.fromEntries(
          fixture.stage3Dense.expectedOpeningKinds.map((kind) => [kind,
            card.renderRoot.querySelectorAll(`.iso-opening-panel[data-kind="${kind}"]`).length,
          ]),
        );
        const vacuumRoots = [...card.renderRoot.querySelectorAll('.vacpuck, .vactrail')];
        const materialDefinitions = card.renderRoot.querySelectorAll('[data-hp-iso-material-def]');
        const definitionCounts = {
          total: materialDefinitions.length,
          patterns: card.renderRoot.querySelectorAll('pattern[data-hp-iso-material-def]').length,
          filters: card.renderRoot.querySelectorAll('filter[data-hp-iso-material-def]').length,
        };
        const pulseDeviceId = fixture.stage3Dense?.pulseDeviceIdsBySpace?.[card._space] || '';
        const pulseRoot = card.renderRoot.querySelector(
          `.dev[data-id="${CSS.escape(pulseDeviceId)}"]`,
        );
        const facetCounts = {
          value: card.renderRoot.querySelectorAll('.dev .value-badge').length,
          lqi: card.renderRoot.querySelectorAll('.dev .lqi').length,
          new: card.renderRoot.querySelectorAll('.dev .newdot').length,
          pulse: pulseRoot?.querySelectorAll('.device-pulse, .activity-dot').length ?? 0,
          roomMetrics: card.renderRoot.querySelectorAll('.roomlabel .rlmetrics').length,
        };
        const rawBuilds = stage?.getAttribute('data-hp-iso-structural-builds');
        const structuralBuilds = rawBuilds == null ? null : Number(rawBuilds);
        return {
          effectiveProjection: typeof card._effectiveProjection === 'function'
            ? card._effectiveProjection() : null,
          isoStageRevision: stage?.getAttribute('data-hp-iso-stage') ?? null,
          structuralBuilds: Number.isFinite(structuralBuilds) ? structuralBuilds : null,
          renderedOverlayCount: overlayRoots.length,
          raisedOverlayCount: overlayRoots
            .filter((root) => root.getAttribute('data-hp-iso-raised') === 'true').length,
          nudgedOverlayCount: overlayRoots
            .filter((root) => root.getAttribute('data-hp-iso-nudged') === 'true').length,
          raisedVacuumCount: vacuumRoots.filter((root) =>
            root.getAttribute('data-hp-iso-raised') === 'true'
            || root.hasAttribute('data-hp-iso-overlay-kind')).length,
          overlayKinds: [...new Set(overlayRoots
            .map((root) => root.getAttribute('data-hp-iso-overlay-kind'))
            .filter(Boolean))].sort(),
          totalRootsByKind,
          stage3RootsByKind,
          openingSurfaceCounts,
          materialDefinitionCount: definitionCounts.total,
          definitionCounts,
          facetCounts,
          pulseDiagnostics: pulseRoot ? {
            id: pulseRoot.getAttribute('data-id'),
            state: pulseRoot.getAttribute('data-state'),
            className: pulseRoot.className,
            ariaLabel: pulseRoot.getAttribute('aria-label'),
          } : null,
        };
      };
      const assertStage3Snapshot = (snapshot, label) => {
        if (!requireStage3) return;
        const expectedKinds = fixture.stage3Dense.expectedOverlayKinds;
        const missingKinds = expectedKinds.filter((kind) => !snapshot.overlayKinds.includes(kind));
        const failures = [];
        if (snapshot.effectiveProjection !== 'iso') failures.push('effective projection is not iso');
        if (snapshot.isoStageRevision !== '4') failures.push('Stage 4 revision marker is absent');
        if (snapshot.structuralBuilds == null) failures.push('structural build counter is absent');
        if (snapshot.renderedOverlayCount < 1) failures.push('no raised overlay roots rendered');
        if (snapshot.raisedOverlayCount !== snapshot.renderedOverlayCount)
          failures.push('one or more Stage 4 overlay roots remained outside the low visual plane');
        if (snapshot.nudgedOverlayCount < 1) failures.push('dense fixture produced no bounded nudge');
        if (snapshot.raisedVacuumCount !== 0) failures.push('floor-bound vacuum was marked as raised');
        if (missingKinds.length) failures.push(`missing overlay kinds: ${missingKinds.join(', ')}`);
        for (const kind of expectedKinds) {
          const total = snapshot.totalRootsByKind[kind];
          const stage3 = snapshot.stage3RootsByKind[kind];
          if (total < 1) failures.push(`no rendered ${kind} roots`);
          else if (stage3 !== total)
            failures.push(`${kind} Stage 4 roots ${stage3}/${total}`);
        }
        for (const kind of fixture.stage3Dense.expectedOpeningKinds) {
          if (!(snapshot.openingSurfaceCounts[kind] > 0))
            failures.push(`no Stage 4 ${kind} opening surfaces`);
        }
        for (const [facet, count] of Object.entries(snapshot.facetCounts)) {
          if (!(count > 0)) failures.push(`no observable ${facet} facet${facet === 'pulse'
            ? ` (${JSON.stringify(snapshot.pulseDiagnostics)})` : ''}`);
        }
        if (snapshot.materialDefinitionCount < 1
            || snapshot.materialDefinitionCount > fixture.stage3Dense.materialDefinitionLimit) {
          failures.push(`material definitions ${snapshot.materialDefinitionCount}`
            + ` exceed 1..${fixture.stage3Dense.materialDefinitionLimit}`);
        }
        if (!(snapshot.definitionCounts.patterns > 0)) failures.push('no shared texture pattern');
        if (!(snapshot.definitionCounts.filters > 0)) failures.push('no shared shadow filter');
        if (failures.length)
          throw new Error(`Stage 4 ${label} contract failed: ${failures.join('; ')}`);
      };

      window.__card?.remove?.();
      localStorage.clear();
      if (isometric) {
        localStorage.setItem('houseplan_card_alpha_v1', '1');
        localStorage.setItem('houseplan_card_view_v1', JSON.stringify(Object.fromEntries(
          fixture.config.spaces.map((space) => [space.id, 'iso']),
        )));
        history.replaceState(null, '', '?hp_alpha=1');
      } else history.replaceState(null, '', location.pathname);
      const host = document.getElementById('host');
      const card = document.createElement('houseplan-card');
      // #520 diagnostics: where the extra half second of model readiness goes.
      // Counts Lit update cycles and model builds; printed, never budgeted.
      card.__diag = { updates: 0, updateMs: 0, models: 0, adopts: 0, epochs: [] };
      // Every `_cfgEpoch` bump with the frame that made it: the extra epoch is
      // what rebuilds the model a second time (#520).
      let diagEpoch = 0;
      Object.defineProperty(card, '_cfgEpoch', {
        configurable: true,
        get: () => diagEpoch,
        set: (next) => {
          if (next !== diagEpoch) {
            const frames = (new Error().stack || '').split('\n').slice(1, 4)
              .map((line) => line.trim().replace(/^at\s+/, '').replace(/\s*\(.*$/, ''));
            card.__diag.epochs.push(`${diagEpoch}->${next}@${frames.join('<')}`);
          }
          diagEpoch = next;
        },
      });
      const diagPerform = card.performUpdate.bind(card);
      card.performUpdate = function () {
        const started = performance.now();
        const result = diagPerform();
        card.__diag.updates += 1;
        card.__diag.updateMs += performance.now() - started;
        return result;
      };
      const diagBuild = card._buildModel.bind(card);
      card._buildModel = function () { card.__diag.models += 1; return diagBuild(); };
      if (typeof card._adoptStructuralResponses === 'function') {
        const legacy = card._adoptStructuralResponses.bind(card);
        card._adoptStructuralResponses = function (...args) { card.__diag.adopts += 1; return legacy(...args); };
      } else if (typeof card._adoptAuthoritative === 'function') {
        const gated = card._adoptAuthoritative.bind(card);
        card._adoptAuthoritative = function (...args) { card.__diag.adopts += 1; return gated(...args); };
      }
      card.setConfig({
        type: 'custom:houseplan-card', title: `Performance baseline ${sample}`, icon_size: 3.4,
      });
      let wsCalls = 0;
      const connection = {
        subscribeEvents: async () => () => undefined,
        subscribeMessage: async () => () => undefined,
      };
      const hassBase = {
        language: 'en', locale: { language: 'en' },
        user: { id: 'perf', name: 'Performance fixture', is_admin: true },
        devices: fixture.devices, entities: fixture.entities, areas: fixture.areas,
        floors: {
          one: { floor_id: 'one', name: 'One', level: 0 },
          two: { floor_id: 'two', name: 'Two', level: 1 },
          three: { floor_id: 'three', name: 'Three', level: 2 },
        },
        callWS: async (message) => {
          wsCalls++;
          if (message.type === 'houseplan/config/get')
            return { config: structuredClone(fixture.config), rev: 1, can_write: true };
          if (message.type === 'houseplan/layout/get')
            return { layout: structuredClone(fixture.layout), rev: 1 };
          if (message.type === 'config/device_registry/list') return Object.values(fixture.devices);
          if (message.type === 'config/entity_registry/list') return Object.values(fixture.entities);
          if (message.type === 'config_entries/get')
            return [{ entry_id: 'perf_entry', domain: 'houseplan_perf', title: 'Synthetic performance fixture' }];
          if (message.type === 'manifest/list') return [{ domain: 'houseplan_perf', name: 'House Plan Performance' }];
          return { ok: true };
        },
        callService: async () => undefined,
        connection,
        localize: () => null,
        formatEntityState: (state) => state.state,
        config: { unit_system: { length: 'km' } },
      };
      const hassFor = (states) => ({ ...hassBase, states });

      const loadLongTasks = startLongTaskWindow();
      const loadStarted = performance.now();
      host.replaceChildren(card);
      if (requiresIsometric && window.__hpAlpha !== true) {
        if (typeof card._onLabsSnapshot !== 'function')
          throw new Error('large-house-isometric-v1 candidate has no Labs fixture hook');
        // Comparison bundles before #448 do not understand hp_alpha. Preserve
        // the cross-version benchmark only for that base; current candidates
        // must activate through the real URL/storage contract above.
        card._onLabsSnapshot({ alpha: true, active: Object.freeze(['iso']), space: '' });
      }
      card.hass = hassFor(fixture.states);
      // launch() warms its own bootstrap card, but each measured sample creates
      // a fresh card. Current lazy bundles therefore need their own controller
      // construction; monolithic stable bundles remain immediate (#380).
      if (!await window.__hpEnsureHarnessEditorRuntime(card))
        throw new Error('large-house editor runtime did not preload');
      if (isometric) await ensureIsoRuntime(card);
      window.__hpAssertCardContract(card, cardContract);
      if (requiresIsometric && (typeof card._setProjection !== 'function'
          || !(card._isoGeometryCache instanceof Map))) {
        throw new Error('large-house-isometric-v1 candidate has no renderer contract');
      }
      await until(() => card._loadOk && card._model?.length === fixture.counts.floors);
      await card.updateComplete;
      await frame();
      const modelReadyMs = Number((performance.now() - loadStarted).toFixed(2));
      await until(() => card._booting === false);
      if (interaction && '_bootSoft' in card) await until(() => card._bootSoft === false);
      await frame();
      const firstStableRenderMs = Number((performance.now() - loadStarted).toFixed(2));
      const bootDiag = {
        updates: card.__diag.updates,
        updateMs: Number(card.__diag.updateMs.toFixed(1)),
        models: card.__diag.models,
        adopts: card.__diag.adopts,
        cfgEpoch: card._cfgEpoch,
        epochs: card.__diag.epochs.slice(0, 8),
      };
      const initialProjection = typeof card._effectiveProjection === 'function'
        ? card._effectiveProjection() : null;
      if (requiresIsometric && initialProjection !== 'iso')
        throw new Error(`${profile} entered Flat fallback instead of effective Iso`);
      const initialIsoFingerprint = card.renderRoot
        .querySelector('[data-hp="iso-walls"]')?.getAttribute('data-fingerprint') ?? null;
      if (requiresIsometric && !initialIsoFingerprint)
        throw new Error(`${profile} has no rendered Iso geometry fingerprint`);
      const initialIsoStructuralBuilds = isometric ? isoStructuralBuildCount(card) : null;
      if (requiresIsoStructuralBuildCounter && initialIsoStructuralBuilds == null)
        throw new Error(`${profile} has no structural build counter`);
      const initialStage3 = stage3Dense ? stage3Snapshot(card) : null;
      if (initialStage3) assertStage3Snapshot(initialStage3, 'initial render');
      const loadLongTaskResult = await loadLongTasks.stop();
      let fullRenderCount = 0;
      let diagnosticsScanCount = 0;
      let physicalPreflightCount = 0;
      let physicalPreflightMs = 0;
      const fullRenderReasons = [];
      if (interaction) {
        const renderBody = card._renderBody.bind(card);
        card._renderBody = (...args) => { fullRenderCount++; return renderBody(...args); };
        const bindingStatus = card._bindingStatus.bind(card);
        card._bindingStatus = (...args) => { diagnosticsScanCount++; return bindingStatus(...args); };
        const checkSpacePhysicalGeometry = card._checkSpacePhysicalGeometry.bind(card);
        card._checkSpacePhysicalGeometry = (...args) => {
          physicalPreflightCount++;
          const started = performance.now();
          try { return checkSpacePhysicalGeometry(...args); }
          finally { physicalPreflightMs += performance.now() - started; }
        };
        const willUpdate = card.willUpdate.bind(card);
        card.willUpdate = (changed) => {
          fullRenderReasons.push([...changed.keys()].map(String));
          return willUpdate(changed);
        };
      }
      const viewToggle = isometric ? await duration(async () => {
        if (typeof card._setProjection === 'function') {
          card._setProjection('flat');
          await card.updateComplete;
          card._setProjection('iso');
          await ensureIsoRuntime(card);
          await card.updateComplete;
        } else {
          // Comparison SHAs before #89 intentionally ignore the Labs operation.
          card.requestUpdate();
          await card.updateComplete;
        }
      }) : null;
      const spaceSwitch = await duration(async () => {
        card._pickSpace('perf-floor-2');
        await card.updateComplete;
      });

      const steadyStage3 = stage3Dense ? stage3Snapshot(card) : null;
      if (steadyStage3) assertStage3Snapshot(steadyStage3, 'steady floor');
      const steadyIsoFingerprint = card.renderRoot
        .querySelector('[data-hp="iso-walls"]')?.getAttribute('data-fingerprint') ?? null;
      if (requiresIsometric && !steadyIsoFingerprint)
        throw new Error(`${profile} lost Iso geometry after the space switch`);
      const steadyIsoStructuralBuilds = isometric ? isoStructuralBuildCount(card) : null;
      if (requiresIsoStructuralBuildCounter && steadyIsoStructuralBuilds == null)
        throw new Error(`${profile} lost its structural build counter after the space switch`);

      const firstEntity = stage3Dense
        ? fixture.stage3Dense.stateEntityId
        : Object.keys(fixture.states)[0];
      const nextStates = {
        ...fixture.states,
        [firstEntity]: { ...fixture.states[firstEntity], state: fixture.states[firstEntity].state === 'on' ? 'off' : 'on' },
      };
      const stateUpdate = await duration(async () => {
        card.hass = hassFor(nextStates);
        await card.updateComplete;
      });
      const afterStateStage3 = stage3Dense ? stage3Snapshot(card) : null;
      if (afterStateStage3) assertStage3Snapshot(afterStateStage3, 'HA-only update');
      const afterStateFingerprint = card.renderRoot
        .querySelector('[data-hp="iso-walls"]')?.getAttribute('data-fingerprint') ?? null;
      if (requiresIsometric && afterStateFingerprint !== steadyIsoFingerprint)
        throw new Error(`${profile} rebuilt Iso geometry for an HA-only state update`);
      const afterStateIsoStructuralBuilds = isometric ? isoStructuralBuildCount(card) : null;
      if (requiresIsoStructuralBuildCounter
          && afterStateIsoStructuralBuilds !== steadyIsoStructuralBuilds) {
        throw new Error(`${profile} performed a structural rebuild for an HA-only state update`);
      }
      if (requireStage3 && afterStateStage3.structuralBuilds !== steadyStage3.structuralBuilds)
        throw new Error(`${profile} rebuilt Stage 4 structure for an HA-only state update`);

      let stage3States = nextStates;
      const openingUpdate = stage3Dense ? await duration(async () => {
        const entityId = fixture.stage3Dense.contactEntityId;
        const current = stage3States[entityId];
        stage3States = {
          ...stage3States,
          [entityId]: { ...current, state: current.state === 'on' ? 'off' : 'on' },
        };
        card.hass = hassFor(stage3States);
        await card.updateComplete;
      }) : null;
      const afterOpeningStage3 = stage3Dense ? stage3Snapshot(card) : null;
      if (afterOpeningStage3) assertStage3Snapshot(afterOpeningStage3, 'opening update');
      if (stage3Dense && requiresIsometric && afterOpeningStage3?.effectiveProjection !== 'iso')
        throw new Error(`${profile} entered Flat fallback during an opening update`);
      if (requireStage3 && afterOpeningStage3.structuralBuilds !== steadyStage3.structuralBuilds)
        throw new Error(`${profile} rebuilt Stage 4 structure for an opening update`);

      const overlayInteraction = stage3Dense ? await duration(async () => {
        const overlay = card.renderRoot.querySelector(requireStage3
          ? '[data-hp-iso-overlay-kind="device"][data-hp-iso-floor][data-hp-iso-visual]'
          : '[data-hp="device"]');
        if (!overlay) throw new Error(`${profile} dense fixture rendered no interactive device`);
        overlay.dispatchEvent(new PointerEvent('pointerover', {
          bubbles: true, composed: true, pointerId: 885, pointerType: 'mouse', isPrimary: true,
        }));
        overlay.focus?.();
        await card.updateComplete;
        await frame();
        overlay.dispatchEvent(new PointerEvent('pointerout', {
          bubbles: true, composed: true, pointerId: 885, pointerType: 'mouse', isPrimary: true,
        }));
        overlay.blur?.();
        await card.updateComplete;
      }) : null;
      const afterInteractionStage3 = stage3Dense ? stage3Snapshot(card) : null;
      if (afterInteractionStage3)
        assertStage3Snapshot(afterInteractionStage3, 'hover/focus update');
      if (stage3Dense && requiresIsometric && afterInteractionStage3?.effectiveProjection !== 'iso')
        throw new Error(`${profile} entered Flat fallback during a hover/focus update`);
      if (requireStage3
          && afterInteractionStage3.structuralBuilds !== steadyStage3.structuralBuilds) {
        throw new Error(`${profile} rebuilt Stage 4 structure for a hover/focus update`);
      }

      let interactionDiagnostics = null;
      let interactionTimings = null;
      let interactionLongTasks = null;
      const interactionSeries = interaction ? await duration(async () => {
        const deltas = {};
        const timings = {};
        interactionLongTasks = {};
        const diagnosticsBefore = diagnosticsScanCount;
        const reasonsBefore = fullRenderReasons.length;
        const beforeIrrelevant = fullRenderCount;
        const intakeBefore = card._hassSequence;
        const irrelevantStarted = performance.now();
        let currentStates = nextStates;
        for (let index = 0; index < 30; index++) {
          currentStates = {
            ...currentStates,
            'sensor.performance_unrelated': {
              entity_id: 'sensor.performance_unrelated', state: `${sample}:${index}`,
            },
          };
          card.hass = hassFor(currentStates);
        }
        await card.updateComplete;
        await frame();
        timings.irrelevantHaTicksMs = performance.now() - irrelevantStarted;
        deltas.irrelevantFullRenders = fullRenderCount - beforeIrrelevant;
        deltas.irrelevantHassIntakes = card._hassSequence - intakeBefore;

        const relevantBefore = fullRenderCount;
        const relevantStarted = performance.now();
        currentStates = {
          ...currentStates,
          [firstEntity]: {
            ...currentStates[firstEntity],
            state: currentStates[firstEntity].state === 'on' ? 'off' : 'on',
          },
        };
        card.hass = hassFor(currentStates);
        await card.updateComplete;
        await frame();
        timings.relevantHaTickMs = performance.now() - relevantStarted;
        deltas.relevantOutsideGestureFullRenders = fullRenderCount - relevantBefore;

        const stage = card.renderRoot.querySelector('.stage');
        const device = card.renderRoot.querySelector('[data-hp="device"]');
        const room = card.renderRoot.querySelector('[data-hp="room"]');
        const heavy = card.renderRoot.querySelector('.wallbodies');
        if (!stage || !device || !room || !heavy)
          throw new Error('interaction profile has no stage/device/room/heavy scene');
        const rect = stage.getBoundingClientRect();
        const hoverBefore = fullRenderCount;
        const hoverLongTasks = startLongTaskWindow();
        const hoverStarted = performance.now();
        device.dispatchEvent(new PointerEvent('pointerover', {
          clientX: rect.left + rect.width / 2, clientY: rect.top + rect.height / 2,
          bubbles: true, composed: true, pointerId: 991, pointerType: 'mouse', isPrimary: true,
        }));
        for (let index = 0; index < 40; index++) {
          device.dispatchEvent(new PointerEvent('pointermove', {
            clientX: rect.left + 100 + index, clientY: rect.top + 100 + index / 2,
            bubbles: true, composed: true, pointerId: 991, pointerType: 'mouse', isPrimary: true,
          }));
          if ((index + 1) % 20 === 0) {
            await card.updateComplete;
            await frame();
          }
        }
        const liveTip = card.renderRoot.querySelector('[data-hp-live-tip]');
        deltas.tooltipVisible = !!liveTip && !liveTip.hidden && !!liveTip.textContent?.trim();
        device.dispatchEvent(new PointerEvent('pointerleave', {
          bubbles: false, composed: true, pointerId: 991, pointerType: 'mouse', isPrimary: true,
        }));
        room.dispatchEvent(new PointerEvent('pointerenter', {
          clientX: rect.left + 300, clientY: rect.top + 300,
          bubbles: false, composed: true, pointerId: 991, pointerType: 'mouse', isPrimary: true,
        }));
        for (let index = 0; index < 40; index++) {
          room.dispatchEvent(new PointerEvent('pointermove', {
            clientX: rect.left + 300 + index, clientY: rect.top + 300 + index / 2,
            bubbles: true, composed: true, pointerId: 991, pointerType: 'mouse', isPrimary: true,
          }));
          if ((index + 1) % 20 === 0) { await card.updateComplete; await frame(); }
        }
        room.dispatchEvent(new PointerEvent('pointerleave', {
          bubbles: false, composed: true, pointerId: 991, pointerType: 'mouse', isPrimary: true,
        }));
        for (let index = 0; index < 40; index++) {
          stage.dispatchEvent(new PointerEvent('pointermove', {
            clientX: rect.left + 20 + index, clientY: rect.top + 20,
            bubbles: true, composed: true, pointerId: 991, pointerType: 'mouse', isPrimary: true,
          }));
          if ((index + 1) % 20 === 0) { await card.updateComplete; await frame(); }
        }
        await card.updateComplete;
        timings.hoverSeriesMs = performance.now() - hoverStarted;
        deltas.hoverFullRenders = fullRenderCount - hoverBefore;
        deltas.hoverTargets = ['device', 'room', 'miss'];
        interactionLongTasks.hoverSeries = await hoverLongTasks.stop();

        const cameraSvg = card.renderRoot.querySelector('[data-hp-live-viewbox="camera"], [data-hp-live-viewbox="floor"], .zoomwrap > svg');
        const initialViewBox = cameraSvg?.getAttribute('viewBox') || '';
        const panLongTasks = startLongTaskWindow();
        const panStarted = performance.now();
        const panMoveRenders = [];
        const panTerminalRenders = [];
        let relevantDuringGestureFullRenders = 0;
        let relevantDuringGestureIntakes = 0;
        for (let dragIndex = 0; dragIndex < 4; dragIndex++) {
          const pointerId = 992 + dragIndex;
          stage.dispatchEvent(new PointerEvent('pointerdown', {
            clientX: rect.left + 200, clientY: rect.top + 200, button: 0, buttons: 1,
            bubbles: true, composed: true, pointerId, pointerType: 'mouse', isPrimary: true,
          }));
          await card.updateComplete;
          const panMoveBefore = fullRenderCount;
          for (let index = 0; index < 20; index++) {
            stage.dispatchEvent(new PointerEvent('pointermove', {
              clientX: rect.left + 205 + index * 3, clientY: rect.top + 202 + index,
              button: 0, buttons: 1, bubbles: true, composed: true,
              pointerId, pointerType: 'mouse', isPrimary: true,
            }));
            if (dragIndex === 0 && index === 10) {
              const deferredBefore = fullRenderCount;
              const deferredIntakeBefore = card._hassSequence;
              for (let tick = 0; tick < 3; tick++) {
                currentStates = {
                  ...currentStates,
                  [firstEntity]: { ...currentStates[firstEntity], state: `gesture-${tick}` },
                };
                card.hass = hassFor(currentStates);
              }
              await card.updateComplete;
              relevantDuringGestureFullRenders += fullRenderCount - deferredBefore;
              relevantDuringGestureIntakes += card._hassSequence - deferredIntakeBefore;
            }
            if ((index + 1) % 10 === 0) {
              await card.updateComplete;
              await frame();
            }
          }
          const beforeTerminal = fullRenderCount;
          panMoveRenders.push(beforeTerminal - panMoveBefore);
          stage.dispatchEvent(new PointerEvent('pointerup', {
            clientX: rect.left + 265, clientY: rect.top + 222, button: 0, buttons: 0,
            bubbles: true, composed: true, pointerId, pointerType: 'mouse', isPrimary: true,
          }));
          await card.updateComplete;
          await frame();
          panTerminalRenders.push(fullRenderCount - beforeTerminal);
        }
        timings.panSeriesMs = performance.now() - panStarted;
        interactionLongTasks.panSeries = await panLongTasks.stop();
        const movedViewBox = cameraSvg?.getAttribute('viewBox') || '';
        const currentView = card._viewOr(card._baseVb());
        const currentDevice = card._devices.find((item) => item.id === device.dataset.id);
        const position = currentDevice ? card._pos(currentDevice) : null;
        const scene = position ? card._scenePoint([position.x, position.y]) : null;
        const deviceRect = device.getBoundingClientRect();
        const expectedX = scene ? rect.left + ((scene[0] - currentView.x) / currentView.w) * rect.width : 0;
        const expectedY = scene ? rect.top + ((scene[1] - currentView.y) / currentView.h) * rect.height : 0;
        const overlayErrorPx = scene ? Math.hypot(
          deviceRect.left + deviceRect.width / 2 - expectedX,
          deviceRect.top + deviceRect.height / 2 - expectedY,
        ) : Infinity;

        const cameraLongTasks = startLongTaskWindow();
        const cameraStarted = performance.now();
        const cameraBefore = fullRenderCount;
        const pinchPointerA = 1001, pinchPointerB = 1002;
        stage.dispatchEvent(new PointerEvent('pointerdown', {
          clientX: rect.left + 360, clientY: rect.top + 300, button: 0, buttons: 1,
          bubbles: true, composed: true, pointerId: pinchPointerA,
          pointerType: 'touch', isPrimary: true,
        }));
        stage.dispatchEvent(new PointerEvent('pointerdown', {
          clientX: rect.left + 460, clientY: rect.top + 300, button: 0, buttons: 1,
          bubbles: true, composed: true, pointerId: pinchPointerB,
          pointerType: 'touch', isPrimary: false,
        }));
        await card.updateComplete;
        const pinchMoveBefore = fullRenderCount;
        for (let index = 0; index < 20; index++) {
          stage.dispatchEvent(new PointerEvent('pointermove', {
            clientX: rect.left + 360 - index, clientY: rect.top + 300,
            button: 0, buttons: 1, bubbles: true, composed: true,
            pointerId: pinchPointerA, pointerType: 'touch', isPrimary: true,
          }));
          stage.dispatchEvent(new PointerEvent('pointermove', {
            clientX: rect.left + 460 + index, clientY: rect.top + 300,
            button: 0, buttons: 1, bubbles: true, composed: true,
            pointerId: pinchPointerB, pointerType: 'touch', isPrimary: false,
          }));
          if ((index + 1) % 5 === 0) await frame();
        }
        const pinchTerminalBefore = fullRenderCount;
        for (const pointerId of [pinchPointerA, pinchPointerB]) {
          stage.dispatchEvent(new PointerEvent('pointerup', {
            clientX: rect.left + 410, clientY: rect.top + 300,
            button: 0, buttons: 0, bubbles: true, composed: true,
            pointerId, pointerType: 'touch', isPrimary: pointerId === pinchPointerA,
          }));
        }
        await card.updateComplete;
        await frame();
        const pinchTerminalRenders = fullRenderCount - pinchTerminalBefore;
        for (let index = 0; index < 4; index++) {
          stage.dispatchEvent(new WheelEvent('wheel', {
            deltaY: index % 2 ? 120 : -120,
            clientX: rect.left + rect.width / 2,
            clientY: rect.top + rect.height / 2,
            bubbles: true, cancelable: true,
          }));
        }
        await until(() => !card._cameraTransition.active);
        await card.updateComplete;
        await frame();
        timings.cameraSeriesMs = performance.now() - cameraStarted;
        interactionLongTasks.cameraSeries = await cameraLongTasks.stop();
        deltas.cameraMoveFullRenders = pinchTerminalBefore - pinchMoveBefore;
        deltas.cameraTerminalFullRenders = pinchTerminalRenders;
        deltas.cameraFullRenders = fullRenderCount - cameraBefore;

        const editorLongTaskWindows = [];
        const editorConfigBefore = JSON.stringify(card._serverCfg);
        const editorCallsBefore = wsCalls;
        const editorPaintBefore = card._liveEditorPaintCount || 0;
        let editorElapsed = 0;
        const editorMoveRenders = [];
        const editorTerminalRenders = [];

        card._setMode('plan', false);
        card._tool = 'draw';
        card._path = [[100, 100]];
        card.requestUpdate();
        await card.updateComplete;
        await until(() => !card._modeTransitionBusy && card._continuity.state === 'steady');
        for (let index = 0; index < 5; index++) await frame();
        let editorStage = card.renderRoot.querySelector('.stage');
        let editorRect = editorStage.getBoundingClientRect();
        let editorView = card._viewOr(card._baseVb());
        const fromScene = (x, y) => ({
          clientX: editorRect.left + ((x - editorView.x) / editorView.w) * editorRect.width,
          clientY: editorRect.top + ((y - editorView.y) / editorView.h) * editorRect.height,
        });
        let editorPartLongTasks = startLongTaskWindow();
        let partStarted = performance.now();
        let editorMoveBefore = fullRenderCount;
        for (let index = 0; index < 40; index++) {
          editorStage.dispatchEvent(new PointerEvent('pointermove', {
            ...fromScene(110 + index * 2, 110 + index),
            bubbles: true, composed: true, pointerId: 1101,
            pointerType: 'mouse', isPrimary: true,
          }));
          if ((index + 1) % 10 === 0) await frame();
        }
        let editorTerminalBefore = fullRenderCount;
        editorMoveRenders.push(editorTerminalBefore - editorMoveBefore);
        card._cursorPt = null;
        card._path = [];
        card.requestUpdate();
        await card.updateComplete;
        await frame();
        editorTerminalRenders.push(fullRenderCount - editorTerminalBefore);
        editorElapsed += performance.now() - partStarted;
        editorLongTaskWindows.push(await editorPartLongTasks.stop());

        card._tool = 'resize';
        card.requestUpdate();
        await card.updateComplete;
        const resizeRoom = card._rszRooms()[0];
        const resizeEvent = {
          pointerId: 1102, stopPropagation: () => undefined,
          preventDefault: () => undefined, target: null,
        };
        card._rszEdgeDown(resizeEvent, resizeRoom.id, 1);
        const resizePlan = card._resize?.plan || card._rszDrag?.plan;
        if (!resizePlan) throw new Error('interaction resize plan was not created');
        const resizePreflightBefore = physicalPreflightCount;
        const resizePreflightMsBefore = physicalPreflightMs;
        editorStage = card.renderRoot.querySelector('.stage');
        editorRect = editorStage.getBoundingClientRect();
        editorView = card._viewOr(card._baseVb());
        // A browser delivers pointerdown and pointermove as separate tasks.
        // Keep the synthetic harness from attributing both handlers to one
        // impossible long task while still timing every move-side preflight.
        await new Promise((done) => setTimeout(done, 0));
        editorPartLongTasks = startLongTaskWindow();
        partStarted = performance.now();
        editorMoveBefore = fullRenderCount;
        for (let index = 0; index < 40; index++) {
          const target = [
            resizePlan.a[0] + resizePlan.n[0] * card._gridPitch * (1 + index / 40),
            resizePlan.a[1] + resizePlan.n[1] * card._gridPitch * (1 + index / 40),
          ];
          card._rszMove({
            ...resizeEvent,
            clientX: editorRect.left + ((target[0] - editorView.x) / editorView.w) * editorRect.width,
            clientY: editorRect.top + ((target[1] - editorView.y) / editorView.h) * editorRect.height,
          });
          if ((index + 1) % 10 === 0) await frame();
        }
        editorTerminalBefore = fullRenderCount;
        editorMoveRenders.push(editorTerminalBefore - editorMoveBefore);
        deltas.resizeLivePreflightChecks = physicalPreflightCount - resizePreflightBefore;
        deltas.resizeLivePreflightMs = physicalPreflightMs - resizePreflightMsBefore;
        card._rszCancelDrag();
        await card.updateComplete;
        await frame();
        editorTerminalRenders.push(fullRenderCount - editorTerminalBefore);
        editorElapsed += performance.now() - partStarted;
        editorLongTaskWindows.push(await editorPartLongTasks.stop());

        card._setMode('decor', false);
        card._decorTool = 'select';
        const decorShape = card._decorList.find((shape) =>
          shape.kind === 'furniture' || shape.kind === 'rect' || shape.kind === 'ellipse');
        if (!decorShape) throw new Error('interaction profile has no transformable decor');
        card._decorSel = decorShape.id;
        card.requestUpdate();
        await card.updateComplete;
        await until(() => !card._modeTransitionBusy && card._continuity.state === 'steady');
        for (let index = 0; index < 5; index++) await frame();
        card._dtMeasure();
        await card.updateComplete;
        editorStage = card.renderRoot.querySelector('.stage');
        editorRect = editorStage.getBoundingClientRect();
        editorView = card._viewOr(card._baseVb());
        const box = card._decorBoxOf(decorShape);
        const cornerX = box.x + box.w, cornerY = box.y + box.h;
        const decorPointer = (x, y) => ({
          pointerId: 1103, pointerType: 'mouse', shiftKey: false,
          clientX: editorRect.left + ((x - editorView.x) / editorView.w) * editorRect.width,
          clientY: editorRect.top + ((y - editorView.y) / editorView.h) * editorRect.height,
          stopPropagation: () => undefined, preventDefault: () => undefined,
          currentTarget: null, target: null,
        });
        card._dtStart(decorPointer(cornerX, cornerY), 'scale', [1, 1]);
        await card.updateComplete;
        await frame();
        editorPartLongTasks = startLongTaskWindow();
        partStarted = performance.now();
        editorMoveBefore = fullRenderCount;
        for (let index = 0; index < 40; index++) {
          card._dtMove(decorPointer(cornerX + index, cornerY + index / 2));
          if ((index + 1) % 10 === 0) await frame();
        }
        editorTerminalBefore = fullRenderCount;
        editorMoveRenders.push(editorTerminalBefore - editorMoveBefore);
        card._cancelDecorGesture();
        await card.updateComplete;
        await frame();
        editorTerminalRenders.push(fullRenderCount - editorTerminalBefore);
        editorElapsed += performance.now() - partStarted;
        editorLongTaskWindows.push(await editorPartLongTasks.stop());
        timings.editorSeriesMs = editorElapsed;
        interactionLongTasks.editorSeries = {
          supported: editorLongTaskWindows.every((window) => window.supported),
          count: editorLongTaskWindows.reduce((sum, window) => sum + window.count, 0),
          maxMs: Math.max(0, ...editorLongTaskWindows.map((window) => window.maxMs)),
          totalMs: editorLongTaskWindows.reduce((sum, window) => sum + window.totalMs, 0),
        };
        deltas.editorMoveFullRenders = editorMoveRenders;
        deltas.editorTerminalFullRenders = editorTerminalRenders;
        deltas.editorLivePaints = (card._liveEditorPaintCount || 0) - editorPaintBefore;
        deltas.editorConfigStable = JSON.stringify(card._serverCfg) === editorConfigBefore;
        deltas.editorWsWrites = wsCalls - editorCallsBefore;
        deltas.editorLongTaskParts = editorLongTaskWindows;

        card._setMode('view', false);
        await card.updateComplete;
        await frame();
        deltas.panMoveFullRenders = panMoveRenders;
        deltas.terminalFullRenders = panTerminalRenders;
        deltas.relevantDuringGestureFullRenders = relevantDuringGestureFullRenders;
        deltas.relevantDuringGestureIntakes = relevantDuringGestureIntakes;
        deltas.viewBoxMoved = !!initialViewBox && initialViewBox !== movedViewBox;
        deltas.overlayErrorPx = Number(overlayErrorPx.toFixed(2));
        deltas.heavyNodeStable = card.renderRoot.querySelector('.wallbodies') === heavy;
        deltas.diagnosticsScans = diagnosticsScanCount - diagnosticsBefore;
        deltas.fullRenderReasons = fullRenderReasons.slice(reasonsBefore);
        interactionTimings = timings;
        interactionDiagnostics = { supported: requiresInteraction, ...deltas };
        if (requiresInteraction && (
          deltas.irrelevantFullRenders !== 0 || deltas.irrelevantHassIntakes !== 30
          || deltas.relevantOutsideGestureFullRenders !== 1 || deltas.hoverFullRenders !== 0
          || deltas.hoverTargets.join(',') !== 'device,room,miss'
          || deltas.panMoveFullRenders.some((count) => count !== 0)
          || deltas.terminalFullRenders.some((count) => count !== 1)
          || deltas.relevantDuringGestureFullRenders !== 0 || !deltas.tooltipVisible
          || deltas.relevantDuringGestureIntakes !== 3
          || deltas.cameraMoveFullRenders !== 0 || deltas.cameraTerminalFullRenders !== 1
          || deltas.editorMoveFullRenders.some((count) => count !== 0)
          || deltas.editorTerminalFullRenders.some((count) => count > 1)
          || deltas.resizeLivePreflightChecks < 1
          || deltas.editorLivePaints < 3 || !deltas.editorConfigStable || deltas.editorWsWrites !== 0
          || !deltas.viewBoxMoved || deltas.overlayErrorPx > 1 || !deltas.heavyNodeStable
          || deltas.diagnosticsScans !== 0
        )) throw new Error(`interaction structural contract failed: ${JSON.stringify(interactionDiagnostics)}`);
      }) : null;

      let planSnapDiagnostics = null;
      const planSnapPointer = planSnap ? await duration(async () => {
        card._setMode('plan');
        card._tool = 'draw';
        card._path = [];
        card.requestUpdate();
        await card.updateComplete;
        await frame();
        const stage = card.renderRoot.querySelector('.stage');
        const overlay = card.renderRoot.querySelector('[data-hp="plan-snap-overlay"]');
        if (requiresPlanSnap && !overlay) throw new Error('plan-snap candidate has no overlay');
        const staticLines = overlay?.querySelectorAll('.plan-snap-line').length ?? 0;
        const staticNodes = overlay?.querySelectorAll('.plan-snap-node[data-kind="endpoint"]').length ?? 0;
        const cacheValue = card._planSnapGeometryCache?.value ?? null;
        const configBefore = JSON.stringify(card._serverCfg);
        const callsBefore = wsCalls;
        const wallFaceCacheBeforePointer = card._wallFaceGraphCache?.length ?? 0;
        const view = card._viewOr(card._baseVb());
        const rect = stage.getBoundingClientRect();
        const fromPlan = (x, y) => ({
          clientX: rect.left + ((x - view.x) / view.w) * rect.width,
          clientY: rect.top + ((y - view.y) / view.h) * rect.height,
        });
        const firstEndpoint = overlay?.querySelector('.plan-snap-node[data-kind="endpoint"]');
        const longLine = [...(overlay?.querySelectorAll('.plan-snap-line') || [])]
          .map((line) => ({
            line,
            a: [+line.getAttribute('x1'), +line.getAttribute('y1')],
            b: [+line.getAttribute('x2'), +line.getAttribute('y2')],
          }))
          .sort((a, b) => Math.hypot(b.b[0] - b.a[0], b.b[1] - b.a[1])
            - Math.hypot(a.b[0] - a.a[0], a.b[1] - a.a[1]))[0];
        const points = [
          firstEndpoint
            ? [+firstEndpoint.getAttribute('cx'), +firstEndpoint.getAttribute('cy')]
            : [40, 40],
          longLine
            ? [(longLine.a[0] + longLine.b[0]) / 2, (longLine.a[1] + longLine.b[1]) / 2]
            : [120, 40],
          [10, 10],
        ];
        const seenKinds = new Set();
        for (let index = 0; index < 120; index++) {
          const point = points[index % points.length];
          stage.dispatchEvent(new PointerEvent('pointermove', {
            ...fromPlan(point[0], point[1]),
            bubbles: true, composed: true, pointerId: 880, pointerType: 'mouse',
          }));
          await card.updateComplete;
          const active = card.renderRoot.querySelector(
            '[data-hp="plan-snap-overlay"] .plan-snap-node[data-active="true"]',
          );
          if (active) seenKinds.add(active.getAttribute('data-kind'));
          if (requiresPlanSnap && card.renderRoot.querySelectorAll(
            '[data-hp="plan-snap-overlay"] .plan-snap-node[data-active="true"]',
          ).length > 1) throw new Error('plan-snap rendered more than one active candidate');
        }
        const finalOverlay = card.renderRoot.querySelector('[data-hp="plan-snap-overlay"]');
        planSnapDiagnostics = {
          supported: requiresPlanSnap,
          staticLines,
          staticNodes,
          activeKinds: [...seenKinds].sort(),
          cacheStable: cacheValue != null && card._planSnapGeometryCache?.value === cacheValue,
          domStable: (finalOverlay?.querySelectorAll('.plan-snap-line').length ?? 0) === staticLines
            && (finalOverlay?.querySelectorAll('.plan-snap-node[data-kind="endpoint"]').length ?? 0)
              === staticNodes,
          configStable: JSON.stringify(card._serverCfg) === configBefore,
          wsWrites: wsCalls - callsBefore,
          wallFaceCacheStableOnPointer:
            (card._wallFaceGraphCache?.length ?? 0) === wallFaceCacheBeforePointer,
        };
        if (requiresPlanSnap && (
          staticLines < fixture.counts.rooms || staticNodes < fixture.counts.rooms
          || !planSnapDiagnostics.cacheStable || !planSnapDiagnostics.domStable
          || !planSnapDiagnostics.configStable || planSnapDiagnostics.wsWrites !== 0
          || !planSnapDiagnostics.wallFaceCacheStableOnPointer
          || !seenKinds.has('endpoint') || !seenKinds.has('line')
        )) throw new Error(`plan-snap structural contract failed: ${JSON.stringify(planSnapDiagnostics)}`);
        if (requiresWallFace) {
          const oldPath = card._path;
          const oldChainId = card._activeWallChainId;
          const oldPartitionIds = card._activeWallChainPartitionIds;
          const oldCms = card._wallChainSegmentCms;
          const beforePath = [[10, 10]];
          card._path = [[10, 10], [20, 10]];
          card._activeWallChainId = 'perf-face-chain';
          card._activeWallChainPartitionIds = ['perf-face-segment'];
          card._wallChainSegmentCms = [15];
          const acceptedStarted = performance.now();
          card._offerWallFaces(beforePath);
          planSnapDiagnostics.wallFaceAcceptedClickMs = performance.now() - acceptedStarted;
          planSnapDiagnostics.wallFaceCacheEntries = card._wallFaceGraphCache?.length ?? 0;
          card._wallFaceBatch = null;
          card._roomDialog = false;
          card._path = oldPath;
          card._activeWallChainId = oldChainId;
          card._activeWallChainPartitionIds = oldPartitionIds;
          card._wallChainSegmentCms = oldCms;
          if (planSnapDiagnostics.wallFaceAcceptedClickMs > 1000
              || planSnapDiagnostics.wallFaceCacheEntries < 1
              || planSnapDiagnostics.wallFaceCacheEntries > 4) {
            throw new Error(`wall-face accepted-click contract failed: ${JSON.stringify(planSnapDiagnostics)}`);
          }
        }
        card._setMode('view');
        await card.updateComplete;
      }) : null;

      const resizePreview = await duration(async () => {
        card._setMode('plan');
        card._tool = 'resize';
        await card.updateComplete;
        const room = card._rszRooms()[0];
        const pointerId = 777;
        const quietEvent = {
          pointerId,
          stopPropagation: () => undefined,
          preventDefault: () => undefined,
          target: null,
        };
        card._rszEdgeDown(quietEvent, room.id, 1);
        // #380: the previous stable owns the active session directly; current
        // candidates own it through ResizeController. The explicit contract
        // above requires one of these shapes before measurements begin.
        const plan = card._resize?.plan || card._rszDrag?.plan;
        if (!plan) throw new Error('large-house resize plan was not created');
        const target = [
          plan.a[0] + plan.n[0] * card._gridPitch,
          plan.a[1] + plan.n[1] * card._gridPitch,
        ];
        const stage = card.renderRoot.querySelector('.stage');
        const rect = stage.getBoundingClientRect();
        const view = card._viewOr(card._baseVb());
        card._rszMove({
          ...quietEvent,
          clientX: rect.left + ((target[0] - view.x) / view.w) * rect.width,
          clientY: rect.top + ((target[1] - view.y) / view.h) * rect.height,
        });
        await card.updateComplete;
        card._rszCancelDrag();
        card._setMode('view');
        await card.updateComplete;
      });

      const stage = card.renderRoot.querySelector('.stage');
      const rect = stage.getBoundingClientRect();
      const panZoom = await duration(async () => {
        stage.dispatchEvent(new WheelEvent('wheel', {
          deltaY: -120, clientX: rect.left + rect.width / 2, clientY: rect.top + rect.height / 2,
          bubbles: true, cancelable: true,
        }));
        await card.updateComplete;
      });

      const settingsDialog = await duration(async () => {
        card._openSettingsDialog();
        await card.updateComplete;
      });
      card._settingsDialog = null;
      await card.updateComplete;

      const switchCycle = await duration(async () => {
        for (let index = 0; index < 12; index++) {
          card._pickSpace(`perf-floor-${(index % fixture.counts.floors) + 1}`);
          await card.updateComplete;
          // A user cannot produce twelve tab clicks in one JavaScript task.
          // Yield between interactions so Long Task entries describe one
          // switch, while switchCycleMs still measures the complete cycle.
          await new Promise((done) => setTimeout(done, 0));
        }
      });

      await forceGc();
      const cacheBefore = cacheSnapshot(card);
      const heapBefore = performance.memory?.usedJSHeapSize ?? null;
      for (let round = 0; round < 4; round++) {
        for (let index = 0; index < 12; index++) {
          card._pickSpace(`perf-floor-${(index % fixture.counts.floors) + 1}`);
          await card.updateComplete;
          await new Promise((done) => setTimeout(done, 0));
        }
        await forceGc();
      }
      const cacheEntries = cacheSnapshot(card);
      const heapAfter = performance.memory?.usedJSHeapSize ?? null;
      const cacheGrowth = Object.fromEntries(
        Object.keys(cacheEntries).map((key) => [key, cacheEntries[key] - cacheBefore[key]]),
      );
      const finalProjection = typeof card._effectiveProjection === 'function'
        ? card._effectiveProjection() : null;
      if (requiresIsometric && finalProjection !== 'iso')
        throw new Error(`${profile} ended the sample in Flat fallback`);
      const finalStage3 = stage3Dense ? stage3Snapshot(card) : null;
      if (finalStage3) assertStage3Snapshot(finalStage3, 'final warmed state');

      const result = {
        sample,
        bootDiag,
        modelReadyMs,
        firstStableRenderMs,
        ...(viewToggle ? { viewToggleMs: viewToggle.ms } : {}),
        ...(openingUpdate ? { openingUpdateMs: openingUpdate.ms } : {}),
        ...(overlayInteraction ? { overlayInteractionMs: overlayInteraction.ms } : {}),
        ...(planSnapPointer ? {
          planSnapPointerMs: planSnapPointer.ms,
          planSnapDiagnostics,
        } : {}),
        ...(interactionSeries ? {
          interactionSeriesMs: interactionSeries.ms,
          ...interactionTimings,
          interactionDiagnostics,
        } : {}),
        spaceSwitchMs: spaceSwitch.ms,
        stateUpdateMs: stateUpdate.ms,
        resizePreviewMs: resizePreview.ms,
        panZoomMs: panZoom.ms,
        settingsDialogMs: settingsDialog.ms,
        switchCycleMs: switchCycle.ms,
        longTasks: {
          load: loadLongTaskResult,
          ...(viewToggle ? { viewToggle: viewToggle.longTasks } : {}),
          ...(openingUpdate ? { openingUpdate: openingUpdate.longTasks } : {}),
          ...(overlayInteraction ? { overlayInteraction: overlayInteraction.longTasks } : {}),
          ...(planSnapPointer ? { planSnapPointer: planSnapPointer.longTasks } : {}),
          ...(interactionSeries ? interactionLongTasks || {} : {}),
          spaceSwitch: spaceSwitch.longTasks,
          stateUpdate: stateUpdate.longTasks,
          resizePreview: resizePreview.longTasks,
          panZoom: panZoom.longTasks,
          settingsDialog: settingsDialog.longTasks,
          switchCycle: switchCycle.longTasks,
        },
        cacheEntries,
        cacheGrowth,
        heapGrowthBytes: heapBefore == null || heapAfter == null ? null : heapAfter - heapBefore,
        preciseGc: typeof globalThis.gc === 'function',
        renderedDevices: card._devices?.length ?? 0,
        effectiveProjection: finalProjection,
        ...(isometric ? {
          isoStructuralBuilds: {
            supported: steadyIsoStructuralBuilds != null && afterStateIsoStructuralBuilds != null,
            initial: initialIsoStructuralBuilds,
            beforeHaUpdate: steadyIsoStructuralBuilds,
            afterHaUpdate: afterStateIsoStructuralBuilds,
            haUpdateDelta: steadyIsoStructuralBuilds == null || afterStateIsoStructuralBuilds == null
              ? null : afterStateIsoStructuralBuilds - steadyIsoStructuralBuilds,
          },
        } : {}),
        ...(finalStage3 ? {
          isoStageRevision: finalStage3.isoStageRevision,
          stage3Diagnostics: {
            ...finalStage3,
            steadyUpdateStructuralBuildDelta: requireStage3
              ? afterInteractionStage3.structuralBuilds - steadyStage3.structuralBuilds
              : null,
          },
        } : {}),
      };
      card.remove();
      await frame();
      return result;
    }, {
      fixture, sample: measuredSample, cardContract: LARGE_HOUSE_CARD_CONTRACT,
      isometric, requiresIsometric, planSnap, requiresPlanSnap, requiresWallFace,
      interaction, requiresInteraction, stage3Dense, requireStage3,
      requiresIsoStructuralBuildCounter, profile,
    });
    // #520: диагностика печатается в лог прогона и в запись не попадает.
    const { bootDiag, ...measured } = row;
    if (bootDiag) {
      console.log(`#520 diag sample ${row.sample}: updates=${bootDiag.updates}`
        + ` updateMs=${bootDiag.updateMs} models=${bootDiag.models}`
        + ` adopts=${bootDiag.adopts} cfgEpoch=${bootDiag.cfgEpoch}`
        + ` epochs=[${(bootDiag.epochs || []).join(' ; ')}]`
        + ` modelReady=${measured.modelReadyMs} firstStable=${measured.firstStableRenderMs}`);
    }
    if (measuredSample >= 0) rows.push(measured);
  }
} finally {
  await browser.close();
}

const metricNames = [
  'modelReadyMs', 'firstStableRenderMs', 'spaceSwitchMs', 'stateUpdateMs',
  'resizePreviewMs', 'panZoomMs', 'settingsDialogMs', 'switchCycleMs',
];
if (isometric) metricNames.splice(2, 0, 'viewToggleMs');
if (stage3Dense) metricNames.splice(3, 0, 'openingUpdateMs', 'overlayInteractionMs');
if (planSnap) metricNames.splice(2, 0, 'planSnapPointerMs');
if (interaction) metricNames.splice(2, 0,
  'interactionSeriesMs', 'hoverSeriesMs', 'panSeriesMs', 'cameraSeriesMs',
  'editorSeriesMs', 'irrelevantHaTicksMs', 'relevantHaTickMs');
const report = {
  schema: 2,
  profile,
  sourceSha,
  generatedAt: new Date().toISOString(),
  buildFingerprint,
  runtime: {
    node: process.version,
    chromium,
    platform: process.platform,
    arch: process.arch,
    viewport,
    deviceScaleFactor: 1,
    reducedMotion: true,
  },
  fixture: fixtureCounts,
  samples,
  warmups,
  summary: summarizeTimings(rows, metricNames),
  longTasks: summarizeLongTasks(rows),
  effectiveProjection: [...new Set(rows.map((row) => row.effectiveProjection))],
  ...(stage3Dense ? {
    isoStageRevision: [...new Set(rows.map((row) => row.isoStageRevision))],
    stage3Required: requireStage3,
  } : {}),
  rows,
  note: `Compare with a base-SHA report captured by the same runner and evaluate the ${profile} budget.`,
};

const text = `${JSON.stringify(report, null, 2)}\n`;
if (output) {
  mkdirSync(dirname(output), { recursive: true });
  writeFileSync(output, text, 'utf8');
  console.log(output);
} else {
  process.stdout.write(text);
}