Adom Chipsmith - vendor/adom-step/src/assets/shell.html

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>STEP Viewer</title>
<base href="./" />
<link rel="icon" href="favicon.svg" type="image/svg+xml" />
<link rel="stylesheet" href="adom.css" />
</head>
<body>
<script>
// SANITY: prove the page reached the parser. If you don't see "page loaded"
// in /console, the proxy or webview is the culprit, not the boot script.
fetch('console', {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({level: 'log', text: 'page loaded ua=' + navigator.userAgent.slice(0, 80) + ' href=' + location.href})
}).catch(()=>{});
</script>
<!-- Canonical Adom app-header — see gallia/skills/adom-app-header/SKILL.md.
     Single row: brand (icon + name + subtitle) | subject (file + meta) | actions.
     Brand block hovers a popover with version / build / engine / wiki link.
     Subject-meta hides on narrow viewports; subject-name then carries the
     stats tooltip. Total height: 44 px. -->
<header>
  <div class="brand" data-tooltip-target="app-info" tabindex="0">
    <svg class="logo" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true">
      <path d="M3 7l9-4 9 4-9 4-9-4zm0 5l9 4 9-4M3 17l9 4 9-4M16 18.5v3M16 21.5h-1.5"/>
    </svg>
    <span class="app-name">adom-step</span>
    <span class="sep">·</span>
    <span class="app-subtitle">STEP file viewer</span>
  </div>

  <div class="vsep" aria-hidden="true"></div>

  <div class="subject" data-tooltip-target="subject-info">
    <span class="subject-name" id="topSource">No model loaded</span>
    <span class="state-pill" id="topProvenance" data-tooltip="Where the loaded STEP came from. KiCad library = fetched from service-kicad. Local file = your file passed via `adom-step view`. Drop = a STEP file you dropped onto the canvas.">unknown</span>
    <span class="subject-meta" id="topMeta"></span>
  </div>

  <!-- App-info popover (hover the brand block) -->
  <div class="hover-popover" id="app-info" role="dialog" aria-label="App information">
    <div class="popover-title">adom-step</div>
    <div class="popover-row"><span class="k">about</span>
      <span class="v">Fusion 360-style STEP file viewer with measure tool, components browser, and AI-driven inspection.</span></div>
    <div class="popover-row"><span class="k">version</span><span class="v">v0.1.0</span></div>
    <div class="popover-row"><span class="k">engine</span><span class="v">Adom 3D Viewer · Babylon.js 9.5</span></div>
    <div class="popover-row"><span class="k">author</span><span class="v">Adom Inc · adom.inc</span></div>
    <div class="popover-actions">
      <a class="popover-link" href="https://wiki-ufypy5dpx93o.adom.cloud/apps/adom-step" target="_blank" rel="noopener">Open wiki ↗</a>
      <a class="popover-link" href="https://github.com/adom-inc/adom-step" target="_blank" rel="noopener">GitHub ↗</a>
    </div>
  </div>

  <!-- Subject-meta tooltip (hover the subject — surfaces meta when row is narrow) -->
  <div class="hover-popover compact" id="subject-info" role="dialog">
    <div class="popover-row"><span class="k">file</span><span class="v" id="tipFile">—</span></div>
    <div class="popover-row"><span class="k">source</span><span class="v" id="tipSource">—</span></div>
    <div class="popover-row"><span class="k">nodes</span><span class="v" id="tipNodes">—</span></div>
    <div class="popover-row"><span class="k">size</span><span class="v" id="tipSize">—</span></div>
  </div>
</header>

<div class="app">
  <!-- ===== OUTLINE (left-side floating panel — Fusion 360 Browser style) ===== -->
  <aside class="sidebar" id="outlinePanel">
    <div class="sb-header">
      <div class="sb-title-row">
        <div class="sb-title"><span>Outline</span> <span class="count" id="compCount">—</span></div>
        <button class="sb-collapse" id="outlineCollapse" aria-label="Collapse outline" data-tooltip="Collapse the outline (O) — slides the panel away so the 3D view fills the canvas. Click the tab at the left edge to expand.">❮</button>
      </div>
      <input class="sb-search" id="sbSearch" type="text" placeholder="Search outline" data-tooltip="Filter the assembly tree. Matching nodes stay opaque, non-matches dim. Ancestors of matches auto-expand." />
      <div class="sb-filters" id="sbFilters">
        <button class="sb-chip active" data-filter-type="all" data-tooltip="Show every part type (default).">All</button>
      </div>
      <div class="sb-source" id="sbSource">No model loaded</div>
    </div>
    <div class="sb-tree" id="sbTree"></div>
  </aside>
  <!-- Expand tab — only shown when the outline is collapsed. Fusion-style
       slim vertical strip at the canvas's left edge with a chevron pointing
       inward. Click expands the outline back. -->
  <button class="outline-expander" id="outlineExpander" aria-label="Expand outline" data-tooltip="Expand the outline (O).">❯</button>

  <!-- ===== CANVAS + HUD ===== -->
  <div class="canvas-wrap">
    <!-- Container for the canonical Babylon9 viewer's Svelte-mounted canvas.
         Adom3DViewerBabylon9.init() takes a CONTAINER element (not a canvas)
         and creates its own <canvas> inside, so we give it a plain div. -->
    <div id="renderContainer" tabindex="0"></div>

    <!-- Top-left toolbar — icon-only (Home / Front / Top / Iso are handled
         by the canonical viewer's ViewCube top-right). Tooltips carry the
         label + behaviour, so the canvas stays clean. Per
         gallia/skills/human-ui-patterns/playbooks/icons-and-displays.md
         §4b — every glyph is a custom-drawn monochrome SVG (currentColor)
         at viewBox 0 0 24 24, stroke 1.6. NEVER Unicode emoji. -->
    <div class="toolbar">
      <button class="tb-btn icon measure" id="tbMeasure" aria-label="Measure" data-tooltip="Measure (M) — Fusion 360-style smart pick. Shows mm + mils.">
        <!-- Calipers — two jaws + beam, the canonical EE measure tool. -->
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 9 v3 a2 2 0 0 0 2 2 h12 a2 2 0 0 0 2 -2 v-3"/><path d="M4 9 h16"/><path d="M7 14 v3 M11 14 v4 M15 14 v3"/></svg>
      </button>
      <span class="tb-sep"></span>
      <button class="tb-btn icon" id="tbGround" aria-label="Ground plane" data-tooltip="Ground plane + cast shadows. Off by default — flip on when you want a contact shadow under the part.">
        <!-- Ground line + diagonal hatching beneath. -->
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 14 h18"/><path d="M6 14 l-2 4 M10 14 l-2 4 M14 14 l-2 4 M18 14 l-2 4 M22 14 l-2 4"/></svg>
      </button>
      <button class="tb-btn icon" id="tbBottomLight" aria-label="Bottom light" data-tooltip="Bottom-fill light (B) — illuminate the underside of the part. Useful for inspecting BGA balls / QFN pads / through-hole leg bottoms.">
        <!-- Sun with rays pointing UP (light source below, rays going up
             into the chip). -->
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="17" r="3"/><path d="M12 12 v-2 M12 22 v0 M7 17 h-2 M19 17 h2 M8.5 13.5 l-1.5 -1.5 M15.5 13.5 l1.5 -1.5"/></svg>
      </button>
      <button class="tb-btn icon active" id="tbAxes" aria-label="World axes" data-tooltip="World-origin axes (X red / Y green / Z blue). 3d-viewer-design §8a.">
        <!-- 3-axis triad — Z up, X back-left, Y back-right (canonical
             pseudo-3D origin marker). -->
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 14 v-9"/><path d="M12 14 l-7 4"/><path d="M12 14 l7 4"/><circle cx="12" cy="14" r="1.4" fill="currentColor"/></svg>
      </button>
      <button class="tb-btn icon" id="tbMeshAxes" aria-label="Local axes" data-tooltip="Per-mesh local-origin axes. 3d-viewer-design §8b — useful for spotting Y-up vs Z-up bugs.">
        <!-- Triad inside a small mesh-body box (LOCAL frame = bound to
             a single mesh, not the world). -->
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="3" y="13" width="8" height="8" rx="1"/><path d="M7 17 v-9 M7 17 l8 4 M7 17 l8 -4"/></svg>
      </button>
      <span class="tb-sep"></span>
      <button class="tb-btn icon" id="tbInspect" aria-label="Babylon Inspector" data-tooltip="Babylon Inspector — open the materials / scene-graph / debug panel.">
        <!-- Magnifier with a small data dot inside — chosen over the
             generic gear because chipfit / chiplinter readers know
             "inspect" reads as a magnifier. -->
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="10.5" cy="10.5" r="5.5"/><path d="M14.5 14.5 L20 20"/><circle cx="10.5" cy="10.5" r="1.4" fill="currentColor"/></svg>
      </button>
    </div>

    <!-- View presets handled by the canonical viewer's ViewCube (top-right
         of canvas). No app-level Front/Top/Iso/Home buttons needed. -->

    <!-- Drop zone overlay -->
    <div class="dropzone">
      <div class="dz-card">
        Drop a .step / .stp file
        <div class="dz-sub">Converted via service-step2glb · cached on disk by content hash</div>
      </div>
    </div>

    <!-- Measure HUD -->
    <div class="measure-hud" id="measureHud">
      <div class="mh-head">
        <span class="mh-title">Measure</span>
        <span class="mh-close" id="measureClose" data-tooltip="Close (Esc)">✕</span>
      </div>
      <div class="mh-filters">
        <button class="mb-filter active" data-filter="smart" data-tooltip="Smart pick — snaps to the nearest vertex, then edge, then face, in priority order. Fusion 360 default.">Smart</button>
        <button class="mb-filter" data-filter="vertex" data-tooltip="Vertex — snaps your click to the closest mesh vertex within ~1.5 mm.">Vertex</button>
        <button class="mb-filter" data-filter="edge" data-tooltip="Edge — snaps to the midpoint of the nearest edge of the picked face.">Edge</button>
        <button class="mb-filter" data-filter="face" data-tooltip="Face — uses the raw click point on whatever face you picked.">Face</button>
        <button class="mb-filter" data-filter="body" data-tooltip="Body — snaps to the bounding-box center of the whole picked mesh.">Body</button>
      </div>
      <div class="mh-snap" id="measureSnap" data-tooltip="Live indicator of what the next click will snap to. Smart mode tries edges first, then faces, then vertexes.">
        <span class="mh-snap-label">Snap:</span>
        <span class="mh-snap-kind" id="measureSnapKind">—</span>
      </div>
      <div class="mh-body" id="measureBody">
        <div class="mh-hint">Click two points on the model.</div>
      </div>
    </div>

<!-- Section feature was removed (May 2026): user wanted a Fusion 360-grade
     section (visible plane gizmo + draggable + cap fill) which is a much
     bigger refactor. Rather than ship a half-baked clip-plane HUD, the
     feature is gone entirely until that proper implementation arrives. -->

    <!-- Inspect HUD (amber, follows cursor) -->
    <div class="inspect-card" id="inspectCard">
      <div class="ic-head">
        <div class="ic-name" id="icName">—</div>
        <div class="ic-path" id="icPath"></div>
      </div>
      <div class="ic-body" id="icBody"></div>
      <div class="ic-foot">Click to pin · Esc to dismiss</div>
    </div>

    <!-- Splash while the model loads -->
    <div class="splash" id="splash">
      <div class="spinner"></div>
      <div id="splashMsg">Loading 3D viewer…</div>
    </div>

    <div class="toast" id="toast"></div>

    <!-- Right-click context menu for tree rows AND for the 3D canvas. -->
    <div class="ctx-menu" id="ctxMenu">
      <div class="ctx-item" data-act="reveal" data-tooltip="Find this item in the Outline panel and flash it. Useful when you've hidden something and need to find its row to restore visibility.">Reveal in Outline</div>
      <div class="ctx-sep"></div>
      <div class="ctx-item" data-act="isolate" data-tooltip="Hide everything except this item. Click again to un-isolate. Ctrl+Z to undo.">Isolate</div>
      <div class="ctx-item" data-act="hide-others" data-tooltip="Hide every other top-level item. Ctrl+Z to undo.">Hide Others</div>
      <div class="ctx-item" data-act="show" data-tooltip="Show this subtree. Ctrl+Z to undo.">Show</div>
      <div class="ctx-item" data-act="hide" data-tooltip="Hide this subtree. The row will flash in the outline so you can find it again to restore. Ctrl+Z also undoes.">Hide</div>
      <div class="ctx-sep"></div>
      <div class="ctx-item" data-act="zoom" data-tooltip="Frame the camera tight on this item.">Zoom To</div>
      <div class="ctx-item" data-act="copy-name" data-tooltip="Copy the item's name to clipboard.">Copy Name</div>
      <div class="ctx-item" data-act="copy-json" data-tooltip="Copy the item's full metadata as a JSON blob — id, kind, depth, mesh count, bbox, role tags, overlay group (if any). Paste-able into bug reports.">Copy as JSON</div>
      <div class="ctx-sep"></div>
      <div class="ctx-item" data-act="properties" data-tooltip="Pin the inspect card showing this item's bbox, material, and geometry stats.">Properties</div>
    </div>
  </div>
</div>

<!-- =====================================================================
     The canonical Adom Babylon9 viewer is loaded as an ES module.
     It exposes window.Adom3DViewerBabylon9 + window.BABYLON.
     ===================================================================== -->
<script type="module" src="viewer/adom-3d-viewer-babylon9.esm.js"></script>

<script>
'use strict';

// =====================================================================
// 0. Tooltip system — body-appended position:fixed div per
//    human-ui-patterns §1d. Replaces title= attributes (which §1a bans).
//    500ms reveal delay (§1b), cursor-anchored (§1d), suppresses
//    ancestor tooltips when inner element has its own (§1f), never
//    ALL CAPS (§1e — handled in CSS via text-transform: none).
// =====================================================================
(function setupTooltips() {
  const tip = document.createElement('div');
  tip.id = 'adom-tooltip';
  tip.style.cssText = [
    'position: fixed',
    'z-index: 99999',                 /* literal — above any --z-tooltip token */
    'pointer-events: none',
    'background: rgba(32, 36, 43, 0.97)',
    'color: #e6e8eb',
    'border: 1px solid #00b8b1',      /* brand teal */
    'border-radius: 4px',
    'padding: 6px 9px',
    'font-size: 11.5px',
    'line-height: 1.35',
    'max-width: min(320px, calc(100vw - 40px))',
    'box-shadow: 0 6px 18px rgba(0,0,0,0.5)',
    'opacity: 0',
    'transition: opacity 120ms ease-out',
    'text-transform: none',           /* §1e — never inherit uppercase */
    'letter-spacing: 0',
    'font-family: inherit',
    'white-space: pre-line',          /* honor \n in data-tooltip strings as line breaks */
  ].join(';');
  document.body.appendChild(tip);

  let showTimer = 0;
  let lastTrigger = null;

  function position(x, y) {
    const off = 14;
    const rect = tip.getBoundingClientRect();
    const W = window.innerWidth, H = window.innerHeight;
    let left = x + off, top = y + off;
    if (left + rect.width > W - 8) left = x - rect.width - off;
    if (top + rect.height > H - 8) top = y - rect.height - off;
    if (left < 8) left = 8;
    if (top < 8) top = 8;
    tip.style.left = left + 'px';
    tip.style.top = top + 'px';
  }

  function hide() {
    clearTimeout(showTimer);
    showTimer = 0;
    tip.style.opacity = '0';
    lastTrigger = null;
  }

  document.addEventListener('mousemove', (e) => {
    const el = e.target.closest && e.target.closest('[data-tooltip]');
    if (!el) { hide(); return; }
    const text = el.getAttribute('data-tooltip');
    if (!text) { hide(); return; }
    if (el !== lastTrigger) {
      lastTrigger = el;
      tip.textContent = text;
      tip.style.opacity = '0';
      clearTimeout(showTimer);
      showTimer = setTimeout(() => {
        position(e.clientX, e.clientY);
        tip.style.opacity = '1';
      }, 500);
    } else if (tip.style.opacity === '1') {
      position(e.clientX, e.clientY);
    }
  });
  document.addEventListener('mouseleave', hide);
  document.addEventListener('mousedown', hide);
  window.addEventListener('blur', hide);
})();

// =====================================================================
// 1. Console forwarder — every log goes to the server's ring buffer so
//    `adom-step console -f` can tail it. (Pattern from adom-tsci.)
// =====================================================================
(function setupConsoleForwarder() {
  const origLog = console.log.bind(console);
  const origWarn = console.warn.bind(console);
  const origErr = console.error.bind(console);
  function send(level, args) {
    const text = args.map(a => {
      if (typeof a === 'string') return a;
      try { return JSON.stringify(a); } catch (e) { return String(a); }
    }).join(' ');
    fetch('console', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ level, text }),
      keepalive: true,
    }).catch(() => {});
  }
  console.log = (...a) => { send('log', a); origLog(...a); };
  console.warn = (...a) => { send('warn', a); origWarn(...a); };
  console.error = (...a) => { send('error', a); origErr(...a); };
  window.addEventListener('error', (e) => { send('error', [e.message, e.filename, e.lineno]); });
  window.addEventListener('unhandledrejection', (e) => { send('error', ['unhandled rejection:', String(e.reason)]); });
})();

// =====================================================================
// 2. Boot — wait for the viewer module, init the scene, kick off the
//    initial model load, register all UI behaviors.
// =====================================================================

function setSourceLabel(source, sourceType) {
  const txt = source || 'No model loaded';
  document.getElementById('sbSource').textContent = txt;
  // The header subject-name shows the basename only — the full source path
  // moves into the subject-info popover.
  const basename = txt.includes('/') ? txt.split('/').pop() : txt;
  document.getElementById('topSource').textContent = basename;
  const tipFile = document.getElementById('tipFile');
  const tipSource = document.getElementById('tipSource');
  if (tipFile) tipFile.textContent = basename;
  if (tipSource) tipSource.textContent = txt;
  const pill = document.getElementById('topProvenance');
  const t = sourceType || 'unknown';
  pill.dataset.sourceType = t;
  // Friendly label per type.
  const labels = {
    'kicad-library': 'KiCad library',
    'local-file': 'Local file',
    'upload': 'Drop',
    'unknown': 'unknown',
  };
  pill.textContent = labels[t] || t;
}

// Update the header subject-meta + tooltip rows with current scene stats.
// Called after a model finishes loading.
function setSubjectMeta(stats) {
  const meta = document.getElementById('topMeta');
  const tipNodes = document.getElementById('tipNodes');
  const tipSize = document.getElementById('tipSize');
  if (!stats) {
    if (meta) meta.innerHTML = '';
    if (tipNodes) tipNodes.textContent = '—';
    if (tipSize) tipSize.textContent = '—';
    return;
  }
  const parts = [];
  if (stats.nodes != null) parts.push(`${stats.nodes} nodes`);
  if (stats.size) parts.push(stats.size);
  if (meta) {
    meta.innerHTML = parts.map((p, i) => i === 0 ? `<span class="sep">·</span><span>${p}</span>` : `<span class="sep">·</span><span>${p}</span>`).join('');
  }
  if (tipNodes) tipNodes.textContent = stats.nodes != null ? String(stats.nodes) : '—';
  if (tipSize) tipSize.textContent = stats.size || '—';
}

// Interactive hover-popover. SHOW_DELAY = 500ms (human-ui-patterns §1b
// — intentional hovers get the popover, fly-bys don't); HIDE_GRACE =
// 220ms so the user can cross the gap into the popover and click the
// wiki link without dismissing it.
(function attachHeaderPopovers(){
  if (typeof document === 'undefined') return;
  const SHOW_DELAY = 500;
  const HIDE_GRACE = 220;
  const wire = () => {
    document.querySelectorAll('header [data-tooltip-target]').forEach(trigger => {
      if (trigger.__popoverWired) return;
      trigger.__popoverWired = true;
      const target = document.getElementById(trigger.dataset.tooltipTarget);
      if (!target) return;
      let showTimer = null, hideTimer = null;
      const show = () => {
        clearTimeout(hideTimer);
        if (target.classList.contains('show')) return;
        clearTimeout(showTimer);
        showTimer = setTimeout(() => target.classList.add('show'), SHOW_DELAY);
      };
      const queueHide = () => {
        clearTimeout(showTimer);
        clearTimeout(hideTimer);
        hideTimer = setTimeout(() => target.classList.remove('show'), HIDE_GRACE);
      };
      trigger.addEventListener('mouseenter', show);
      trigger.addEventListener('mouseleave', queueHide);
      trigger.addEventListener('focus', show);
      trigger.addEventListener('blur', queueHide);
      target.addEventListener('mouseenter', show);
      target.addEventListener('mouseleave', queueHide);
      trigger.addEventListener('click', e => {
        clearTimeout(showTimer);
        if (target.classList.contains('show')) target.classList.remove('show');
        else target.classList.add('show');
        e.stopPropagation();
      });
    });
    document.addEventListener('click', e => {
      document.querySelectorAll('header .hover-popover.show').forEach(p => {
        if (!p.contains(e.target)) {
          const trigger = document.querySelector(`[data-tooltip-target="${p.id}"]`);
          if (!trigger || !trigger.contains(e.target)) p.classList.remove('show');
        }
      });
    }, true);
  };
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', wire);
  else wire();
})();

function showToast(msg, kind) {
  const t = document.getElementById('toast');
  t.className = 'toast open' + (kind ? ' ' + kind : '');
  t.textContent = msg;
  clearTimeout(t._timer);
  t._timer = setTimeout(() => { t.classList.remove('open'); }, 3500);
}

function setSplash(msg) {
  const s = document.getElementById('splash');
  if (msg === null) { s.style.display = 'none'; return; }
  s.style.display = 'flex';
  document.getElementById('splashMsg').textContent = msg;
}

async function waitForViewer() {
  const t0 = performance.now();
  while (!window.Adom3DViewerBabylon9 || !window.BABYLON) {
    if (performance.now() - t0 > 15000) {
      throw new Error('Adom3DViewerBabylon9 module never loaded after 15s');
    }
    await new Promise(r => setTimeout(r, 50));
  }
}

let viewer = null;       // ViewerInstance from Adom3DViewerBabylon9.init()
let scene = null;
let BABYLON = null;
let modelRoots = [];     // top-level TransformNodes from loaded GLBs
let assemblyTree = [];   // flat list of {id, name, depth, parent, children, meshes, visible}
let nodeById = new Map();
let materialsCache = []; // from /state.materials
let visibilityHistory = []; // undo stack of {prev, next, label}
let visibilityRedo = [];

async function boot() {
  setSplash('Loading 3D viewer…');
  await waitForViewer();
  BABYLON = window.BABYLON;

  const container = document.getElementById('renderContainer');
  // App-level override of 3d-viewer-design §4d: skill says ground + shadow
  // default ON for PCB viewers. For a single-component STEP viewer the
  // ground dominates the iso frame at default zoom and washes the §3b
  // gradient, so we ship it OFF and let the user toggle it on via the
  // Ground button when they want a contact shadow. The toggle still works.
  //
  // NOTE: Adom3DViewerBabylon9.init() takes a CONTAINER element. Passing
  // a <canvas> would nest a 0×0 canvas inside it that nobody can see.
  viewer = window.Adom3DViewerBabylon9.init(container, {
    zUp: true,
    showViewCube: true,
    showGround: false,
    initialViewMode: 'perspective',
  });
  scene = viewer.getScene();

  // The actual rendering canvas is now a child of #renderContainer; we
  // keep a handle to it for sizing + DOM-overlay measurements.
  const canvas = container.querySelector('canvas');

  applyGradientBackground(scene);

  function resizeCanvas() {
    const w = container.clientWidth;
    const h = container.clientHeight;
    if (canvas) {
      canvas.style.width = w + 'px';
      canvas.style.height = h + 'px';
    }
    if (viewer.getEngine) {
      const eng = viewer.getEngine();
      if (eng && eng.resize) eng.resize();
    }
  }
  window.addEventListener('resize', resizeCanvas);
  resizeCanvas();

  // Try to load the initial model from /state.
  await loadInitialModel();

  // Wire all UI.
  setupSidebar();
  setupContextMenu();
  setupToolbar();
  // View buttons removed — ViewCube handles all view presets.
  setupDropzone();
  setupMeasureTool();
  setupInspectTool();
  // (Section tool removed.)
  setupKeyboard();
  setupEvalPolling();
  setupCommandPolling();

  setSplash(null);
  showToast('Ready', 'ok');
}

function applyGradientBackground(scene) {
  // Build the gradient texture: 4×512 vertical strip, top → bottom.
  const W = 4, H = 512;
  const tex = new BABYLON.DynamicTexture('bgGradient', { width: W, height: H }, scene, false);
  const ctx = tex.getContext();
  const grad = ctx.createLinearGradient(0, 0, 0, H);
  grad.addColorStop(0, '#5a6b7e');  // §3b top — medium steel blue-gray
  grad.addColorStop(1, '#2a3340');  // §3b bottom — darker steel
  ctx.fillStyle = grad;
  ctx.fillRect(0, 0, W, H);
  tex.update();
  // Render-behind layer (drawn before the scene meshes).
  const layer = new BABYLON.Layer('bgGradientLayer', null, scene, true /* isBackground */);
  layer.texture = tex;

  // Hide the canonical viewer's BackgroundHelper + BackgroundSkybox so the
  // gradient is visible. The env texture (scene.environmentTexture) still
  // lights materials via PBR — we're only suppressing the *visible* skybox.
  // Re-applies on every frame because the canonical viewer recreates these
  // meshes inside frameModel().
  scene.onBeforeRenderObservable.add(() => {
    for (const m of scene.meshes) {
      if (m.name === 'BackgroundHelper' || m.name === 'BackgroundSkybox') {
        if (m.isEnabled()) m.setEnabled(false);
      }
    }
  });
}

async function loadInitialModel() {
  setSplash('Loading model…');
  let state;
  try {
    state = await fetch('state').then(r => r.json());
  } catch (e) {
    setSplash('Failed to fetch /state — is the server up?');
    return;
  }
  setSourceLabel(state.source, state.source_type);
  materialsCache = state.materials || [];
  if (state.has_model) {
    await loadModelUrl('model.glb?cb=' + Date.now());
  } else {
    setSplash('Drop a .step / .stp file onto the canvas');
  }
}

async function loadModelUrl(url) {
  setSplash('Loading model…');
  // Clear previous content
  if (modelRoots.length) {
    viewer.clearScene();
    modelRoots = [];
    assemblyTree = [];
    nodeById = new Map();
  }
  // Snapshot the scene before load so we can diff in the new nodes only.
  // This is the reliable way to identify the user's model — any name-based
  // filter falls over the moment a STEP file legitimately names a part
  // "arrow" or "cylinder" (e.g. mechanical hardware libraries).
  const beforeIds = new Set();
  for (const n of scene.transformNodes) beforeIds.add(n.uniqueId);
  for (const m of scene.meshes) beforeIds.add(m.uniqueId);

  try {
    await viewer.loadModel(url);
  } catch (e) {
    console.error('loadModel failed:', e);
    setSplash('Failed to load model — see console');
    showToast('Load failed: ' + e.message, 'err');
    return;
  }

  // Babylon's GLB loader inserts a synthetic `__root__` whose children are
  // the GLB's true top-level nodes. Find every fresh `__root__` (not in the
  // before-snapshot) and lift its direct children as our model roots.
  // This is reliable across viewer-internal nodes (axis helpers, indicator
  // sphere, viewcube) that may also be (re)created during loadModel.
  modelRoots = [];
  const allNodes = scene.transformNodes.concat(scene.meshes);
  for (const r of allNodes) {
    if (r.name !== '__root__') continue;
    if (beforeIds.has(r.uniqueId)) continue;
    for (const c of allNodes) {
      if (c.parent === r && !beforeIds.has(c.uniqueId)) modelRoots.push(c);
    }
  }
  // Fallback: if no __root__ was created (some loaders skip it), fall back
  // to "any new node with no new ancestor" — same diff approach as before.
  if (!modelRoots.length) {
    const newNodes = allNodes.filter(n => !beforeIds.has(n.uniqueId));
    const newIds = new Set(newNodes.map(n => n.uniqueId));
    modelRoots = newNodes.filter(n => {
      let p = n.parent;
      while (p) {
        if (newIds.has(p.uniqueId)) return false;
        p = p.parent;
      }
      return true;
    });
  }

  rebuildAssemblyTree();
  renderTree();
  postComponentsToServer();
  setSplash(null);
}

// =====================================================================
// 3. Assembly tree — walk scene.transformNodes recursively.
// =====================================================================

function rebuildAssemblyTree() {
  assemblyTree = [];
  nodeById = new Map();

  function friendlyName(node) {
    if (node.name && node.name !== '__root__' && !node.name.startsWith('node_')) return node.name;
    if (node.metadata && node.metadata.gltf && node.metadata.gltf.extras && node.metadata.gltf.extras.name) {
      return node.metadata.gltf.extras.name;
    }
    const meshes = node.getChildMeshes ? node.getChildMeshes(true) : [];
    if (meshes.length && meshes[0].name) return meshes[0].name;
    return 'Component_' + node.uniqueId;
  }

  function isMeshWithGeometry(n) {
    return n && n.getTotalVertices && n.getTotalVertices() > 0;
  }

  function walk(node, depth, parentEntry) {
    const id = node.uniqueId;
    const directMeshes = (node.getChildMeshes ? node.getChildMeshes(true) : []).filter(m => m.parent === node);
    const allDescendantMeshes = (node.getChildMeshes ? node.getChildMeshes(false) : []);
    // If the node ITSELF is a Mesh with geometry, include it. Babylon 9's
    // Mesh extends TransformNode, so leaf primitives walked by
    // getChildTransformNodes are nodes whose own geometry needs to count.
    if (isMeshWithGeometry(node) && !allDescendantMeshes.includes(node)) {
      allDescendantMeshes.push(node);
    }
    const entry = {
      id,
      node,
      name: friendlyName(node),
      depth,
      parentId: parentEntry ? parentEntry.id : null,
      children: [],
      directMeshes,
      allMeshes: allDescendantMeshes,
      visible: true,
      expanded: depth < 1, // root expanded by default
    };
    nodeById.set(id, entry);
    assemblyTree.push(entry);
    if (parentEntry) parentEntry.children.push(entry);

    const childTNs = (node.getChildTransformNodes ? node.getChildTransformNodes(true) : []);
    for (const c of childTNs) {
      if (c.parent !== node) continue;
      walk(c, depth + 1, entry);
    }
  }

  for (const root of modelRoots) {
    walk(root, 0, null);
  }

  // Post-process: many GLBs (especially STEPs from kicad) ship as one
  // top-level node with hundreds of material-split leaf primitives. That
  // floods the tree with noise. Replace any "many leaves under one parent"
  // with material-grouped synthetic entries (Body / Pins / Contacts / ...).
  // Real assemblies with named sub-parts are left alone.
  collapseLeafPrimitives();
}

function inferMaterialType(name, baseColor) {
  const n = (name || '').toLowerCase();
  if (baseColor && baseColor.length >= 3) {
    const [r, g, b] = baseColor;
    const lum = 0.2126 * r + 0.7152 * g + 0.0722 * b;
    // Gold / copper / brass: red > green > blue, fairly saturated
    if (r > 0.55 && g > 0.35 && b < 0.45 && r > b + 0.15) return { type: 'contact', label: 'Contacts' };
    // Silver / chrome / tin: near-equal RGB and bright
    if (Math.abs(r - g) < 0.12 && Math.abs(g - b) < 0.12 && lum > 0.5) return { type: 'pin', label: 'Pins' };
    // Bright red marker dot
    if (r > 0.55 && g < 0.3 && b < 0.3) return { type: 'marker', label: 'Markers' };
    // Dark plastic body
    if (lum < 0.22) return { type: 'body', label: 'Body' };
  }
  if (/pin|lead|leg|contact/.test(n)) return { type: 'pin', label: 'Pins' };
  if (/body|case|plastic|epoxy|mold/.test(n)) return { type: 'body', label: 'Body' };
  if (/gold|copper|brass|pad/.test(n)) return { type: 'contact', label: 'Contacts' };
  if (/mark|dot|text|silk/.test(n)) return { type: 'marker', label: 'Markers' };
  return { type: 'other', label: 'Other' };
}

let synthIdCounter = -1;

function meshCentroid(m) {
  if (!m.getBoundingInfo) return null;
  m.computeWorldMatrix(true);
  const bb = m.getBoundingInfo().boundingBox;
  return {
    x: (bb.minimumWorld.x + bb.maximumWorld.x) * 0.5,
    y: (bb.minimumWorld.y + bb.maximumWorld.y) * 0.5,
    z: (bb.minimumWorld.z + bb.maximumWorld.z) * 0.5,
  };
}

// Cluster primitives into individual pins. KiCad gull-wing leads have a
// body-side junction at one Z and a bent foot at a lower Z, with the foot
// shifted outward — so XY-distance clustering sees them as 2 separate pins
// per real pin. Correct approach: classify each primitive by the side of
// the body it lives on, then 1D-cluster along the pitch axis (perpendicular
// to the side normal). Returns clusters with { id, meshes, centroid, side }.
function clusterPinsByCentroid(meshes) {
  if (!meshes || meshes.length < 2) return [];
  const items = meshes.map((m, i) => ({ idx: i, mesh: m, c: meshCentroid(m) })).filter(x => x.c);
  if (!items.length) return [];

  // Body bounds from centroid spread (good enough since pins surround the body).
  let minX = Infinity, maxX = -Infinity, minY = Infinity, maxY = -Infinity;
  for (const it of items) {
    if (it.c.x < minX) minX = it.c.x; if (it.c.x > maxX) maxX = it.c.x;
    if (it.c.y < minY) minY = it.c.y; if (it.c.y > maxY) maxY = it.c.y;
  }
  const bodyCx = (minX + maxX) * 0.5;
  const bodyCy = (minY + maxY) * 0.5;

  // Classify side of each primitive by which axis-distance from center is larger.
  // Front/back pins live on -Y/+Y face — pitch axis is X.
  // Left/right pins live on -X/+X face — pitch axis is Y.
  const bySide = { front: [], back: [], left: [], right: [] };
  for (const it of items) {
    const dx = it.c.x - bodyCx, dy = it.c.y - bodyCy;
    let side;
    if (Math.abs(dx) > Math.abs(dy)) side = dx > 0 ? 'right' : 'left';
    else side = dy > 0 ? 'back' : 'front';
    bySide[side].push(it);
  }

  // For each side, cluster along the pitch axis only.
  function clusterAlongAxis(list, axis /* 'x' or 'y' */) {
    if (!list.length) return [];
    // Estimate pitch: sort by axis, find smallest gap that's "real" (not within-pin).
    const sorted = list.slice().sort((a, b) => a.c[axis] - b.c[axis]);
    // First clue at pitch: median gap between adjacent CENTROIDS that differ enough.
    const gaps = [];
    for (let i = 1; i < sorted.length; i++) {
      const g = sorted[i].c[axis] - sorted[i - 1].c[axis];
      if (g > 0) gaps.push(g);
    }
    gaps.sort((a, b) => a - b);
    // Pitch ≈ median of upper half of gaps (within-pin gaps cluster near zero;
    // between-pin gaps cluster at the real pitch).
    const upper = gaps.slice(Math.floor(gaps.length / 2));
    const pitchEst = upper.length ? upper[Math.floor(upper.length / 2)] : 0;
    const eps = pitchEst > 0 ? pitchEst * 0.4 : 0.0003; // 40% of pitch

    // 1D clustering: walk sorted list, start a new cluster when gap > eps.
    const clusters = [];
    let cur = [sorted[0]];
    for (let i = 1; i < sorted.length; i++) {
      const g = sorted[i].c[axis] - sorted[i - 1].c[axis];
      if (g > eps) { clusters.push(cur); cur = []; }
      cur.push(sorted[i]);
    }
    if (cur.length) clusters.push(cur);
    return clusters;
  }

  const allClusters = [];
  function addClusters(list, axis, sideName) {
    const cs = clusterAlongAxis(list, axis);
    for (const list2 of cs) {
      const meshes2 = list2.map(it => it.mesh);
      let cx = 0, cy = 0, cz = 0;
      for (const it of list2) { cx += it.c.x; cy += it.c.y; cz += it.c.z; }
      cx /= list2.length; cy /= list2.length; cz /= list2.length;
      allClusters.push({ meshes: meshes2, centroid: { x: cx, y: cy, z: cz }, side: sideName });
    }
  }
  addClusters(bySide.front, 'x', 'front');
  addClusters(bySide.right, 'y', 'right');
  addClusters(bySide.back,  'x', 'back');
  addClusters(bySide.left,  'y', 'left');

  // Order pins counterclockwise starting at front-left (pin1 conventional location).
  const sideOrder = { front: 0, right: 1, back: 2, left: 3 };
  allClusters.sort((a, b) => {
    if (a.side !== b.side) return sideOrder[a.side] - sideOrder[b.side];
    if (a.side === 'front') return a.centroid.x - b.centroid.x;
    if (a.side === 'right') return a.centroid.y - b.centroid.y;
    if (a.side === 'back')  return b.centroid.x - a.centroid.x;
    return b.centroid.y - a.centroid.y;
  });

  allClusters.forEach((c, i) => { c.id = i + 1; });
  return allClusters;
}

let pinClusters = [];

// 2D grid clustering for LGA / BGA / module contacts arranged on a flat
// face (NOT side-mounted leads). Each contact becomes one cluster. Uses
// union-find with eps ≈ pad_pitch/2 estimated from bbox extent and
// primitive count. Reused by the strobe / isolatePin / pins-list APIs so
// the same UX applies to leaded chips and grid-pad chips alike.
function clusterContactsByGrid(meshes) {
  if (!meshes || meshes.length < 2) return [];
  const items = meshes.map((m, i) => ({ idx: i, mesh: m, c: meshCentroid(m) })).filter(x => x.c);
  if (!items.length) return [];

  let minX = Infinity, maxX = -Infinity, minY = Infinity, maxY = -Infinity;
  for (const it of items) {
    if (it.c.x < minX) minX = it.c.x; if (it.c.x > maxX) maxX = it.c.x;
    if (it.c.y < minY) minY = it.c.y; if (it.c.y > maxY) maxY = it.c.y;
  }
  const bodyCx = (minX + maxX) * 0.5;
  const bodyCy = (minY + maxY) * 0.5;
  // Pitch estimation in 3D using BIMODAL SPLIT of nearest-neighbor
  // distances. Within-pad NNs cluster at the small end; between-pad NNs
  // at the larger end. Find the largest ratio-gap between consecutive
  // sorted NN values — that's the natural split. Set eps just above the
  // small group's max, just below the large group's min.
  const nnDists = [];
  for (let i = 0; i < items.length; i++) {
    let best = Infinity;
    for (let j = 0; j < items.length; j++) {
      if (i === j) continue;
      const dx = items[i].c.x - items[j].c.x;
      const dy = items[i].c.y - items[j].c.y;
      const dz = items[i].c.z - items[j].c.z;
      const d2 = dx * dx + dy * dy + dz * dz;
      if (d2 < best) best = d2;
    }
    if (best < Infinity && best > 1e-18) nnDists.push(Math.sqrt(best));
  }
  nnDists.sort((a, b) => a - b);
  let eps;
  if (nnDists.length < 2) {
    eps = (nnDists[0] || 0.001) * 0.5;
  } else {
    // Find the largest RATIO gap. A 1.5x or larger jump between adjacent
    // sorted NN distances is a strong signal of "within-pad ends here,
    // between-pad starts here".
    let bestRatio = 1, splitIdx = -1;
    for (let i = 1; i < nnDists.length; i++) {
      if (nnDists[i - 1] < 1e-12) continue;
      const ratio = nnDists[i] / nnDists[i - 1];
      if (ratio > bestRatio) { bestRatio = ratio; splitIdx = i; }
    }
    if (bestRatio >= 1.5 && splitIdx > 0) {
      // eps = midpoint between the last within-pad NN and the first
      // between-pad NN, on a log scale (geometric mean).
      eps = Math.sqrt(nnDists[splitIdx - 1] * nnDists[splitIdx]);
    } else {
      // No clear gap — fall back to 80th percentile × 0.5 (safer than 60).
      const p = nnDists[Math.floor(nnDists.length * 0.8)];
      eps = p * 0.5;
    }
  }
  eps = Math.max(eps, 0.00005);
  const eps2 = eps * eps;
  const cellSize = eps * 2;
  const buckets = new Map();
  function key(x, y, z) {
    return Math.floor(x / cellSize) + ',' + Math.floor(y / cellSize) + ',' + Math.floor(z / cellSize);
  }
  items.forEach((it, i) => {
    const k = key(it.c.x, it.c.y, it.c.z);
    if (!buckets.has(k)) buckets.set(k, []);
    buckets.get(k).push(i);
  });
  const parent = items.map((_, i) => i);
  function find(i) { while (parent[i] !== i) { parent[i] = parent[parent[i]]; i = parent[i]; } return i; }
  function union(a, b) { a = find(a); b = find(b); if (a !== b) parent[a] = b; }
  for (let i = 0; i < items.length; i++) {
    const a = items[i];
    const cx = Math.floor(a.c.x / cellSize),
          cy = Math.floor(a.c.y / cellSize),
          cz = Math.floor(a.c.z / cellSize);
    for (let dx = -1; dx <= 1; dx++)
      for (let dy = -1; dy <= 1; dy++)
        for (let dz = -1; dz <= 1; dz++) {
          const k = (cx + dx) + ',' + (cy + dy) + ',' + (cz + dz);
          const list = buckets.get(k);
          if (!list) continue;
          for (const j of list) {
            if (j <= i) continue;
            const b = items[j];
            const ddx = a.c.x - b.c.x, ddy = a.c.y - b.c.y, ddz = a.c.z - b.c.z;
            if (ddx * ddx + ddy * ddy + ddz * ddz <= eps2) union(i, j);
          }
        }
  }
  const groups = new Map();
  for (let i = 0; i < items.length; i++) {
    const r = find(i);
    if (!groups.has(r)) groups.set(r, []);
    groups.get(r).push(items[i]);
  }
  const clusters = [];
  for (const list of groups.values()) {
    const meshes = list.map(it => it.mesh);
    let cx = 0, cy = 0, cz = 0;
    for (const it of list) { cx += it.c.x; cy += it.c.y; cz += it.c.z; }
    cx /= list.length; cy /= list.length; cz /= list.length;
    // Side classification for grid contacts: 'bottom' is conventional
    // for LGA/BGA, but if the centroids span both top and bottom Z layers
    // we tag each cluster with whichever face it's nearest to.
    clusters.push({ meshes, centroid: { x: cx, y: cy, z: cz }, side: 'bottom' });
  }
  // Row-major order from front-left → back-right (similar to common
  // BGA pad numbering A1 at top-left going right then down).
  clusters.sort((a, b) => {
    const dy = a.centroid.y - b.centroid.y;
    if (Math.abs(dy) > 0.00001) return dy;
    return a.centroid.x - b.centroid.x;
  });
  clusters.forEach((c, i) => { c.id = i + 1; });
  return clusters;
}

// =====================================================================
// Geometry-based THT pin discovery — Mode B.
//
// Color-based clustering (Mode A) misses pins on STEPs where the
// manufacturer modeled the pin legs in the same material as the body
// (e.g. WAGO terminal blocks: 50 silver "spring contact" meshes ≠ the
// 5 actual through-hole solder legs, which sit in the gray body
// material). Mode B walks ALL meshes and finds tall-thin sub-meshes
// poking BELOW the part's seating plane. Material color is irrelevant.
//
// Pin candidate filter (units = scene meters):
//   • Mesh's bbox-min Z is within 0.8 mm of the model's bottom plane
//     (bottommost mesh in the scene).
//   • Cross-section ≤ 1.5 mm: max(width_x, depth_y) ≤ 0.0015.
//   • Height ≥ 0.8 mm: bbox_z extent ≥ 0.0008.
//   • Aspect ratio: height / max(w, d) ≥ 1.2 (taller than wide).
//
// Sub-meshes of the same pin (chamfer + shaft + tip) get merged when
// their XY centroids are within 1.0 mm — typical sub-mesh jitter for
// a single THT lead is 0.2-0.3 mm; 1.0 mm is well below 2.0 mm pitch
// (the smallest standard THT pitch found on connectors).
// =====================================================================
function discoverThruHolePins() {
  // Skip viewer's helper meshes (axis arrows, viewcube faces, gizmos).
  const allMeshes = scene.meshes.filter(m =>
    m.geometry && m.getTotalVertices() > 0 && m.material &&
    !/Axis|sphere|Sky|grid|axis|viewcube|gizmo/i.test(m.material.name || '') &&
    !/__viewer__/i.test(m.name || '')
  );
  if (allMeshes.length < 3) return [];

  // Find the part's seating plane = lowest Z of any real mesh.
  let modelMinZ = Infinity;
  for (const m of allMeshes) {
    const z = m.getBoundingInfo().boundingBox.minimumWorld.z;
    if (z < modelMinZ) modelMinZ = z;
  }

  // Filter to pin-shaped meshes near the seating plane.
  const PIN_FOOT_MAX = 0.0015;   // 1.5 mm cross-section ceiling
  const PIN_HEIGHT_MIN = 0.0008; // 0.8 mm tall minimum
  const PIN_ASPECT_MIN = 1.2;
  const SEAT_TOLERANCE = 0.0008; // 0.8 mm — bottom of pin must be near bottom of part
  const candidates = [];
  for (const m of allMeshes) {
    const bb = m.getBoundingInfo().boundingBox;
    const bottomZ = bb.minimumWorld.z;
    if (bottomZ > modelMinZ + SEAT_TOLERANCE) continue;
    const w = bb.maximumWorld.x - bb.minimumWorld.x;
    const d = bb.maximumWorld.y - bb.minimumWorld.y;
    const h = bb.maximumWorld.z - bb.minimumWorld.z;
    const foot = Math.max(w, d);
    if (foot > PIN_FOOT_MAX) continue;
    if (h < PIN_HEIGHT_MIN) continue;
    if (h / Math.max(foot, 1e-6) < PIN_ASPECT_MIN) continue;
    candidates.push({
      mesh: m,
      c: { x: bb.centerWorld.x, y: bb.centerWorld.y, z: bb.centerWorld.z },
    });
  }
  if (candidates.length < 2) return [];

  // Union-find merge by XY proximity. eps = 1.0 mm.
  const eps = 0.0010;
  const eps2 = eps * eps;
  const parent = candidates.map((_, i) => i);
  function find(i) { while (parent[i] !== i) { parent[i] = parent[parent[i]]; i = parent[i]; } return i; }
  for (let i = 0; i < candidates.length; i++) {
    for (let j = i + 1; j < candidates.length; j++) {
      const ddx = candidates[i].c.x - candidates[j].c.x;
      const ddy = candidates[i].c.y - candidates[j].c.y;
      if (ddx * ddx + ddy * ddy <= eps2) {
        const a = find(i), b = find(j);
        if (a !== b) parent[a] = b;
      }
    }
  }
  const groups = new Map();
  for (let i = 0; i < candidates.length; i++) {
    const r = find(i);
    if (!groups.has(r)) groups.set(r, []);
    groups.get(r).push(candidates[i]);
  }

  // Build clusters. The "side" tag is used downstream to render side
  // badges in the outline; for THT inline parts we tag every cluster
  // 'bottom' (matches Mode B's grid behavior) — the per-side semantics
  // of leaded chips don't apply.
  const clusters = [];
  for (const list of groups.values()) {
    let cx = 0, cy = 0, cz = 0;
    for (const it of list) { cx += it.c.x; cy += it.c.y; cz += it.c.z; }
    cx /= list.length; cy /= list.length; cz /= list.length;
    clusters.push({
      meshes: list.map(it => it.mesh),
      centroid: { x: cx, y: cy, z: cz },
      side: 'bottom',
    });
  }

  // Number along the dominant pitch axis (X if X-spread > Y-spread).
  // For a 1×N inline connector, pin 1 conventionally sits at the lowest
  // index along the long axis.
  let minX = Infinity, maxX = -Infinity, minY = Infinity, maxY = -Infinity;
  for (const c of clusters) {
    if (c.centroid.x < minX) minX = c.centroid.x; if (c.centroid.x > maxX) maxX = c.centroid.x;
    if (c.centroid.y < minY) minY = c.centroid.y; if (c.centroid.y > maxY) maxY = c.centroid.y;
  }
  const xSpread = maxX - minX, ySpread = maxY - minY;
  if (xSpread >= ySpread) {
    clusters.sort((a, b) => a.centroid.x - b.centroid.x);
  } else {
    clusters.sort((a, b) => a.centroid.y - b.centroid.y);
  }
  clusters.forEach((c, i) => { c.id = i + 1; });
  return clusters;
}

function collapseLeafPrimitives() {
  const before = assemblyTree.slice();
  const newTree = [];
  const newById = new Map();

  function visit(entry, parent) {
    const cloned = Object.assign({}, entry, { children: [] });
    newById.set(cloned.id, cloned);
    newTree.push(cloned);
    if (parent) parent.children.push(cloned);

    const leafChildren = entry.children.filter(c => c.children.length === 0);
    const nonLeafChildren = entry.children.filter(c => c.children.length > 0);

    // Group leaves by material if the count is "noisy" (>= 6 leaves).
    if (leafChildren.length >= 6 && !nonLeafChildren.length) {
      const groups = new Map();
      for (const c of leafChildren) {
        const mesh = c.allMeshes[0];
        const mat = mesh && mesh.material;
        const matName = mat ? (mat.name || 'unnamed') : 'no-material';
        let color = null;
        if (mat) {
          const c3 = mat.albedoColor || mat.diffuseColor;
          if (c3) color = [c3.r, c3.g, c3.b];
        }
        if (!color) {
          const m = materialsCache.find(x => x.name === matName);
          if (m && m.baseColor) color = m.baseColor;
        }
        const inf = inferMaterialType(matName, color);
        const key = matName + '|' + inf.type;
        if (!groups.has(key)) {
          groups.set(key, {
            id: synthIdCounter--,
            node: null,
            isMaterialGroup: true,
            name: inf.label,
            matName,
            type: inf.type,
            baseColor: color,
            depth: cloned.depth + 1,
            parentId: cloned.id,
            children: [],
            directMeshes: [],
            allMeshes: [],
            visible: true,
            expanded: false,
            primitiveCount: 0,
          });
        }
        const g = groups.get(key);
        g.allMeshes.push(...c.allMeshes);
        g.directMeshes.push(...c.directMeshes);
        g.primitiveCount += 1;
      }
      // Order groups: Body, Pins, Contacts, Markers, Other (visual hierarchy)
      const order = { body: 0, pin: 1, contact: 2, marker: 3, other: 4 };
      const sorted = Array.from(groups.values()).sort((a, b) => (order[a.type] - order[b.type]) || a.matName.localeCompare(b.matName));
      for (const g of sorted) {
        newById.set(g.id, g);
        newTree.push(g);
        cloned.children.push(g);
      }
    } else {
      for (const c of entry.children) visit(c, cloned);
    }
  }

  const roots = before.filter(e => e.depth === 0);
  for (const r of roots) visit(r, null);
  assemblyTree = newTree;
  nodeById = newById;

  // After grouping, cluster the electrical contacts (leads OR pads) into
  // individual pin clusters. Two paths:
  //   (a) Leaded chips (QFP/QFN/SOIC/DIP/SOT): per-side 1D clustering on
  //       the Pins material group. Pin pitch comes from gap analysis.
  //   (b) Grid chips (LGA/BGA/module): 2D union-find on the Contacts
  //       material group. Pad pitch ≈ bbox / sqrt(N).
  // Whichever produces clusters becomes the strobe / isolatePin / per-pin
  // outline source. Both share the same `pinClusters` array so downstream
  // code (CLI, JS API, sidebar entries) doesn't care about the source.
  pinClusters = [];
  let clusterHostGroup = null;
  const pinsGroup = assemblyTree.find(e => e.isMaterialGroup && e.type === 'pin');
  const contactsGroup = assemblyTree.find(e => e.isMaterialGroup && e.type === 'contact');
  if (pinsGroup && pinsGroup.allMeshes.length > 0) {
    pinClusters = clusterPinsByCentroid(pinsGroup.allMeshes);
    clusterHostGroup = pinsGroup;
  }
  if (!pinClusters.length && contactsGroup && contactsGroup.allMeshes.length >= 4) {
    // No leaded pins detected — try grid clustering on the Contacts group.
    pinClusters = clusterContactsByGrid(contactsGroup.allMeshes);
    clusterHostGroup = contactsGroup;
  }
  // Mode B fallback: geometry-based THT pin discovery. Runs when material-
  // based clustering came up short (≤ 4 clusters) — that's the threshold
  // where we'd rather trust geometry. WAGO 2601-3105 is the canonical
  // case: 50 silver "spring" meshes group into 4 sites, but the 5 actual
  // THT solder legs are gray and only Mode B sees them. Mode B wins ONLY
  // if it finds strictly more clusters than Mode A — never regress a
  // good Mode A result on a leaded SMD.
  if (pinClusters.length <= 4) {
    const geom = discoverThruHolePins();
    if (geom.length > pinClusters.length) {
      pinClusters = geom;
      // Host the geometry-discovered pins under the existing Pins group
      // if there is one; otherwise host them under the body group so the
      // outline still has a parent row to expand into.
      const bodyGroup = assemblyTree.find(e => e.isMaterialGroup && e.type === 'body');
      clusterHostGroup = pinsGroup || contactsGroup || bodyGroup || clusterHostGroup;
    }
  }
  if (clusterHostGroup) {

    // Re-number so pin 1 is the IPC-convention pin near the marker. The
    // marker sits at a corner of the package; pin 1 is the FIRST pin you
    // encounter going counterclockwise FROM that corner — which means
    // pin 1 is on the side that's CCW-adjacent to the marker corner, not
    // on the side perpendicular to it. Going CCW from each corner:
    //   back-left   → LEFT side, back-most pin
    //   front-left  → FRONT side, left-most pin
    //   front-right → RIGHT side, front-most pin
    //   back-right  → BACK side, right-most pin
    // Then number CCW from there.
    const markerCentroid = findPin1MarkerCentroid();
    if (markerCentroid && pinClusters.length > 1) {
      // Body center estimated from the cluster centroids' bounds.
      let minX = Infinity, maxX = -Infinity, minY = Infinity, maxY = -Infinity;
      for (const c of pinClusters) {
        if (c.centroid.x < minX) minX = c.centroid.x; if (c.centroid.x > maxX) maxX = c.centroid.x;
        if (c.centroid.y < minY) minY = c.centroid.y; if (c.centroid.y > maxY) maxY = c.centroid.y;
      }
      const bodyCx = (minX + maxX) * 0.5, bodyCy = (minY + maxY) * 0.5;
      const dx = markerCentroid.x - bodyCx;
      const dy = markerCentroid.y - bodyCy;
      let pin1Side;
      if      (dx < 0 && dy > 0) pin1Side = 'left';   // back-left  corner → LEFT side
      else if (dx < 0 && dy < 0) pin1Side = 'front';  // front-left corner → FRONT side
      else if (dx > 0 && dy < 0) pin1Side = 'right';  // front-right corner → RIGHT side
      else                       pin1Side = 'back';   // back-right corner → BACK side

      // Find the cluster on pin1Side closest to the marker corner.
      let bestIdx = -1;
      let bestD = Infinity;
      for (let i = 0; i < pinClusters.length; i++) {
        if (pinClusters[i].side !== pin1Side) continue;
        const c = pinClusters[i].centroid;
        const ddx = c.x - markerCentroid.x;
        const ddy = c.y - markerCentroid.y;
        const d2 = ddx * ddx + ddy * ddy;
        if (d2 < bestD) { bestD = d2; bestIdx = i; }
      }
      // Fallback: if no cluster on pin1Side (shouldn't happen with QFP), use overall nearest.
      if (bestIdx < 0) {
        bestIdx = 0; bestD = Infinity;
        for (let i = 0; i < pinClusters.length; i++) {
          const c = pinClusters[i].centroid;
          const ddx = c.x - markerCentroid.x, ddy = c.y - markerCentroid.y;
          const d2 = ddx * ddx + ddy * ddy;
          if (d2 < bestD) { bestD = d2; bestIdx = i; }
        }
      }
      pinClusters = pinClusters.slice(bestIdx).concat(pinClusters.slice(0, bestIdx));
      pinClusters.forEach((c, i) => { c.id = i + 1; });
    }

    // Inject each detected pin as a child entry of the Pins material
    // group so the user can see, isolate, and toggle visibility per-pin
    // from the components outline. Per-pin centroid (mm) is in the row
    // tooltip — feeds footprint matching workflows.
    if (pinClusters.length) {
      // Naming: leaded chips show "Pin N", grid-pad chips show "Contact N"
      // so the row label matches the source material group's category.
      const isContactSource = clusterHostGroup.type === 'contact';
      const nameKind = isContactSource ? 'Contact' : 'Pin';
      clusterHostGroup.children = [];   // replace any leaf children
      for (const c of pinClusters) {
        const pinEntry = {
          id: synthIdCounter--,
          node: null,
          isPinEntry: true,
          pinId: c.id,
          pinSide: c.side,
          pinKind: nameKind,            // 'Pin' or 'Contact'
          pinCentroid: c.centroid,
          name: nameKind + ' ' + c.id,
          parentId: clusterHostGroup.id,
          depth: clusterHostGroup.depth + 1,
          children: [],
          directMeshes: c.meshes,
          allMeshes: c.meshes,
          visible: true,
          expanded: false,
        };
        nodeById.set(pinEntry.id, pinEntry);
        assemblyTree.push(pinEntry);
        clusterHostGroup.children.push(pinEntry);
      }
      clusterHostGroup.primitiveCount = pinClusters.length;
    }
  }
}

function findPin1MarkerCentroid() {
  // Prefer a 'marker'-typed group; fall back to a small 'other' group
  // (often the pin-1 dot misclassified by color heuristic — KiCad's brown
  // marker tone doesn't match the bright-red threshold).
  const candidates = assemblyTree.filter(e =>
    e.isMaterialGroup && (e.type === 'marker' || (e.type === 'other' && e.primitiveCount <= 3))
  );
  if (!candidates.length) return null;
  // Use the one with the fewest primitives (most likely to be the actual
  // marker dot, not random small features).
  candidates.sort((a, b) => a.primitiveCount - b.primitiveCount);
  const meshes = candidates[0].allMeshes;
  if (!meshes.length) return null;
  let cx = 0, cy = 0, cz = 0, n = 0;
  for (const m of meshes) {
    const c = meshCentroid(m);
    if (!c) continue;
    cx += c.x; cy += c.y; cz += c.z; n += 1;
  }
  if (!n) return null;
  return { x: cx / n, y: cy / n, z: cz / n };
}

function postComponentsToServer() {
  const flat = assemblyTree.map(e => ({
    id: e.id,
    name: e.name,
    depth: e.depth,
    parentId: e.parentId,
    visible: e.visible,
    childCount: e.children.length,
    meshCount: e.allMeshes.length,
  }));
  fetch('api/components', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(flat),
  }).catch(() => {});
}

// =====================================================================
// 4. Sidebar render — depth-padded rows with caret + eye + isolate.
// =====================================================================

let activeTypeFilter = 'all';  // 'all' | 'body' | 'pin' | 'contact' | 'marker' | 'other'

function renderFilterChips() {
  const wrap = document.getElementById('sbFilters');
  wrap.innerHTML = '';
  const counts = { body: 0, pin: 0, contact: 0, marker: 0, other: 0 };
  for (const e of assemblyTree) {
    if (e.isMaterialGroup) counts[e.type] = (counts[e.type] || 0) + (e.primitiveCount || 1);
  }
  const total = Object.values(counts).reduce((a, b) => a + b, 0);
  const chips = [
    { type: 'all', label: 'All', count: total, tip: 'Show every part type (default).' },
    { type: 'body', label: 'Body', count: counts.body || 0, tip: 'Body / case / plastic — dark molded compound.' },
    { type: 'pin', label: 'Pins', count: counts.pin || 0, tip: 'Leads / legs — silver or tin metallic surfaces.' },
    { type: 'contact', label: 'Contacts', count: counts.contact || 0, tip: 'Gold / copper pads — solderable contact metal.' },
    { type: 'marker', label: 'Markers', count: counts.marker || 0, tip: 'Pin-1 dots, marking text, silkscreen ID.' },
    { type: 'other', label: 'Other', count: counts.other || 0, tip: 'Materials that didn\'t match a known category.' },
  ];
  for (const c of chips) {
    if (c.type !== 'all' && c.count === 0) continue;
    const btn = document.createElement('button');
    btn.className = 'sb-chip' + (activeTypeFilter === c.type ? ' active' : '');
    btn.dataset.filterType = c.type;
    btn.setAttribute('data-tooltip', c.tip);
    btn.innerHTML = c.label + ' <span class="count">' + c.count + '</span>';
    btn.onclick = () => { activeTypeFilter = c.type; renderTree(); };
    wrap.appendChild(btn);
  }
}

function passesTypeFilter(entry) {
  if (activeTypeFilter === 'all') return true;
  // A material group matches if its type matches.
  if (entry.isMaterialGroup) return entry.type === activeTypeFilter;
  // A non-group node passes if any of its descendants match.
  let p = entry;
  const queue = [entry];
  while (queue.length) {
    const cur = queue.shift();
    if (cur.isMaterialGroup && cur.type === activeTypeFilter) return true;
    queue.push(...cur.children);
  }
  return false;
}

function renderTree() {
  renderFilterChips();
  const treeEl = document.getElementById('sbTree');
  treeEl.innerHTML = '';
  document.getElementById('compCount').textContent = assemblyTree.length + ' nodes';
  // Mirror node count into the canonical header subject-meta + tooltip.
  setSubjectMeta({ nodes: assemblyTree.length, size: window.__lastModelSizeStr || null });
  function appendRow(entry) {
    if (!isAncestorChainExpanded(entry)) return; // hidden under collapsed parent
    if (!passesTypeFilter(entry)) return;        // hidden by chip filter
    const row = document.createElement('div');
    row.className = 'tree-row';
    if (!entry.visible) row.classList.add('hidden-vis');
    if (entry.isMaterialGroup) row.classList.add('material-group');
    row.dataset.id = entry.id;
    row.style.paddingLeft = (4 + entry.depth * 14) + 'px';

    const caret = document.createElement('span');
    caret.className = 'caret';
    if (entry.children.length) {
      caret.classList.add('has-children');
      if (entry.expanded) caret.classList.add('open');
      caret.textContent = '❯';  // VS-Code-style chevron ❯ — CSS rotates 90° when .open
      caret.setAttribute('data-tooltip',
        entry.expanded
          ? 'Collapse — hide this node\'s ' + entry.children.length + ' children in the tree.'
          : 'Expand — show this node\'s ' + entry.children.length + ' children in the tree.');
      caret.onclick = (e) => { e.stopPropagation(); entry.expanded = !entry.expanded; renderTree(); };
    } else {
      // Leaf row — no caret glyph (CSS visibility:hidden), just an empty
      // slot so the alignment matches the parent rows. Not clickable.
      caret.classList.add('leaf');
      caret.textContent = '';
    }
    row.appendChild(caret);

    const eye = document.createElement('span');
    eye.className = 'eye';
    const triState = computeTriState(entry);
    if (triState === 'mixed') eye.classList.add('mixed');
    eye.textContent = triState === 'visible' ? '●' : (triState === 'hidden' ? '○' : '◐');
    const eyeTip = triState === 'visible'
      ? 'Visible — click to hide this node and its descendants.'
      : (triState === 'hidden'
        ? 'Hidden — click to show this node and its descendants.'
        : 'Mixed visibility — some descendants hidden. Click to show all.');
    eye.setAttribute('data-tooltip', eyeTip);
    eye.onclick = (e) => {
      e.stopPropagation();
      const willHide = triState !== 'hidden';
      pushVisibilityHistory(() => setSubtreeVisibility(entry, !willHide));
    };
    row.appendChild(eye);

    const iso = document.createElement('span');
    iso.className = 'iso';
    iso.textContent = '◇';
    iso.setAttribute('data-tooltip',
      'Isolate — hide every other top-level subtree, leave only this node visible. Camera stays where it is — double-click the row or use right-click → Zoom To if you want to re-frame.');
    iso.onclick = (e) => { e.stopPropagation(); pushVisibilityHistory(() => isolateEntry(entry, { frame: false })); };
    row.appendChild(iso);

    if (entry.isMaterialGroup && entry.baseColor) {
      const swatch = document.createElement('span');
      swatch.className = 'mat-swatch';
      const [r, g, b] = entry.baseColor;
      const css = `rgb(${Math.round(r*255)},${Math.round(g*255)},${Math.round(b*255)})`;
      swatch.style.background = css;
      swatch.setAttribute('data-tooltip',
        'Material color: ' + css + ' (from the GLB material baseColor). All ' +
        (entry.primitiveCount || entry.children.length) + ' primitives in this ' +
        entry.type + ' group share this material.');
      row.appendChild(swatch);
    }

    const label = document.createElement('span');
    label.className = 'label';
    label.textContent = entry.name;
    row.appendChild(label);

    // Per-row status badges. Derived from entry.kind + entry.isOverlay
    // + future entry.locked / entry.reDetected flags. SVG monochrome
    // icons (no Unicode emoji) per human-ui-patterns icon rules.
    const badges = computeRowBadges(entry);
    if (badges.length) {
      const wrap = document.createElement('span');
      wrap.className = 'tree-badges';
      for (const b of badges) {
        const el = document.createElement('span');
        el.className = 'tree-badge';
        el.dataset.kind = b.kind;
        el.setAttribute('data-tooltip', b.tip);
        el.innerHTML = TREE_BADGE_SVG[b.kind] || '';
        wrap.appendChild(el);
      }
      row.appendChild(wrap);
    }

    // Always set a row-level tooltip with the FULL name + metadata so
    // that ellipsis-truncated rows reveal their full label on hover.
    // Pin/material-group rows extend this with the existing detail.
    row.setAttribute('data-tooltip', buildRowTooltip(entry));

    if (entry.isPinEntry) {
      // Side badge ("front" / "right" / "back" / "left").
      const side = document.createElement('span');
      side.className = 'pin-side';
      side.dataset.side = entry.pinSide;
      side.textContent = entry.pinSide;
      row.appendChild(side);
    } else if (entry.isMaterialGroup) {
      const cnt = document.createElement('span');
      cnt.className = 'child-count';
      // If pin clustering produced entries under THIS group (Pins or
      // Contacts), show the cluster count + the kind name. Otherwise show
      // the raw primitive count from material grouping.
      const hostsClusters = (entry.type === 'pin' || entry.type === 'contact') && pinClusters.length;
      const num = hostsClusters ? pinClusters.length : entry.primitiveCount;
      const kind = entry.type === 'contact' ? 'contact' : 'pin';
      const unit = hostsClusters
        ? (num === 1 ? ' ' + kind : ' ' + kind + 's')
        : (num === 1 ? ' part' : ' parts');
      cnt.textContent = num + unit;
      // Tooltip explaining what the number means. Specific so a user who
      // says "what does 30 mean?" gets the answer on hover.
      cnt.setAttribute('data-tooltip', hostsClusters
        ? num + ' individual ' + kind + 's detected by clustering this material’s mesh primitives by spatial position. Each is selectable + isolatable in the outline below.'
        : num + ' mesh primitives in this material group. Primitives are how the GLB exporter splits geometry by material/face — they’re not semantic objects.');
      row.appendChild(cnt);
    } else if (entry.children.length) {
      const cnt = document.createElement('span');
      cnt.className = 'child-count';
      cnt.textContent = entry.children.length;
      cnt.setAttribute('data-tooltip',
        entry.children.length + ' direct child entr' +
        (entry.children.length === 1 ? 'y' : 'ies') +
        ' below this node. Expand the caret to see them.');
      row.appendChild(cnt);
    }

    // Mirror the 3D-viewport gentle highlight when the user hovers this
    // row. The sidebar hover targets THIS exact entry (no second-level
    // demotion) so a Pin N row highlights just that pin, not the whole
    // Pins group.
    row.onmouseenter = () => setHoverHighlight(entry);
    row.onmouseleave = () => setHoverHighlight(null);
    row.ondblclick = () => frameOnEntry(entry);
    row.oncontextmenu = (e) => {
      e.preventDefault();
      openContextMenu(e.clientX, e.clientY, entry);
    };

    treeEl.appendChild(row);
    for (const c of entry.children) appendRow(c);
  }
  for (const e of assemblyTree) {
    if (e.depth === 0) appendRow(e);
  }
  applySearchFilter();
}

// Per-row status badge map. Each kind maps to a 12px monochrome SVG
// using stroke-currentColor so the per-kind tint comes from CSS. Kept
// as inline SVGs (not Unicode emoji) per gallia human-ui-patterns
// icons-and-displays.md §4b — emoji renders inconsistently across
// platforms, never aligns to icon stroke weight, and Apple-specific
// emoji on Linux looks misplaced.
const TREE_BADGE_SVG = {
  // Pin-1 star — 5-pointed outline. Marks the user-placed pin-1
  // indicator (entries with kind containing 'pin1').
  pin1:
    '<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">' +
    '<path d="M8 1.8 9.85 5.55 14 6.16l-3 2.92L11.7 13.2 8 11.24 4.3 13.2 5 9.08 2 6.16 6.15 5.55 8 1.8z"/>' +
    '</svg>',
  // Synthesized — 4-pointed sparkle. Marks chipsmith-added overlays
  // (footprint pads, faux PCB, vias, solder-jet domes, user-placed
  // pin-1 — anything outside the original GLB hierarchy).
  synth:
    '<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">' +
    '<path d="M8 1.5 V5.5 M8 10.5 V14.5 M1.5 8 H5.5 M10.5 8 H14.5"/>' +
    '<path d="M3.5 3.5 L5.5 5.5 M10.5 10.5 L12.5 12.5 M3.5 12.5 L5.5 10.5 M10.5 5.5 L12.5 3.5" stroke-opacity="0.55"/>' +
    '</svg>',
  // Locked — padlock. Set when the entry came from a baked
  // .chipsmith.step (post-sign-off, not editable until re-opened).
  locked:
    '<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">' +
    '<rect x="3" y="7" width="10" height="7" rx="1.2"/>' +
    '<path d="M5.5 7V5a2.5 2.5 0 0 1 5 0v2"/>' +
    '</svg>',
  // Re-detected after Y-up auto-rotate. Sub-tree gets this badge when
  // detection ran a second time post-rotate. (v1.1 — flag wired but
  // detection currently disabled.)
  redet:
    '<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">' +
    '<path d="M3 8a5 5 0 0 1 8.5-3.5L13 6"/>' +
    '<path d="M13 3v3h-3"/>' +
    '<path d="M13 8a5 5 0 0 1-8.5 3.5L3 10"/>' +
    '<path d="M3 13v-3h3"/>' +
    '</svg>',
};

// Decide which badges (if any) a tree row should carry. Single source
// of truth; called from appendRow. The chipsmith overlay system tags
// every overlay entry with kind=`overlay-*`, isOverlay=true; we map
// those to the synth + (for pin-1) star icons. Locked + re-detected
// flags come later from sign-off / detection state — wired here so
// they light up automatically once the upstream state lands.
function computeRowBadges(entry) {
  const out = [];
  const kind = entry.kind || '';
  const k = kind.toLowerCase();
  if (k.includes('pin1')) {
    out.push({
      kind: 'pin1',
      tip: 'Pin-1 indicator. Marks the chip-side polarity reference — every downstream Adom tool reads this entry to align footprints, silkscreen, and BOM rows. Survives sign-off bake.',
    });
  }
  if (entry.isOverlay && !entry.isMaterialGroup) {
    out.push({
      kind: 'synth',
      tip: 'Chipsmith-synthesized overlay (not part of the manufacturer STEP). Toggleable, removable, and baked into the .chipsmith.step at sign-off so the synthesized geometry survives every future load.',
    });
  }
  if (entry.locked) {
    out.push({
      kind: 'locked',
      tip: 'Locked — loaded from a baked .chipsmith.step. Re-open the chip for editing to clear locks.',
    });
  }
  if (entry.reDetected) {
    out.push({
      kind: 'redet',
      tip: 'Re-detected after Y-up auto-rotate. The original orientation was wrong; chipsmith rotated 90° about X and re-classified this feature.',
    });
  }
  return out;
}

// Build the hover-tooltip string for a tree row. Always includes the
// FULL entry name (so ellipsis-truncated rows reveal what they are on
// hover) plus a second line of structured metadata: depth, kind,
// mesh + child counts, overlay group, and pin-specific centroid info
// when applicable. Per the human-ui-patterns skill: tooltip on every
// interactive element, 600 ms reveal delay, never ALL CAPS — handled
// by the existing tooltip CSS.
function buildRowTooltip(entry) {
  // Overlay rows can carry a rich tooltip set by the overlay plugin
  // (chipsmith injects provenance explanations here so the user
  // understands where each footprint source came from).
  if (entry.overlayTooltip) return entry.overlayTooltip;
  const lines = [];
  // Line 1: the full name. Use the entry.name verbatim — that's what
  // got truncated visually and what the user wants to see.
  lines.push(entry.name || '<unnamed>');

  // Line 2: structured metadata. Compose only the fields that apply
  // so the tooltip stays compact.
  const meta = [];
  if (typeof entry.depth === 'number') meta.push('depth ' + entry.depth);
  if (entry.kind && !entry.isOverlay)  meta.push(entry.kind);
  if (entry.isOverlay)                 meta.push('overlay');
  if (entry.overlayGroup)              meta.push('group "' + entry.overlayGroup + '"');
  const meshN  = (entry.allMeshes || []).length;
  if (meshN)                           meta.push(meshN + ' mesh' + (meshN === 1 ? '' : 'es'));
  const childN = (entry.children || []).length;
  if (childN)                          meta.push(childN + ' child' + (childN === 1 ? '' : 'ren'));
  if (entry.isMaterialGroup)           meta.push('material group');
  if (meta.length) lines.push(meta.join('  ·  '));

  // Pin entries: append the centroid + side line that the legacy
  // tooltip exposed. Same data; just one line down.
  if (entry.isPinEntry && entry.pinCentroid) {
    const c = entry.pinCentroid;
    const SCENE_TO_MM = 1000;
    lines.push('pin ' + entry.pinId + ' · ' + entry.pinSide +
      ' side · centroid ' +
      (c.x * SCENE_TO_MM).toFixed(3) + ', ' +
      (c.y * SCENE_TO_MM).toFixed(3) + ', ' +
      (c.z * SCENE_TO_MM).toFixed(3) + ' mm');
  }

  // Material-group entries: explain what the count number means so a
  // hover reveals "30 parts" → "30 mesh primitives". Same wording as
  // the inline child-count tooltip, lifted to the row.
  if (entry.isMaterialGroup) {
    const num = entry.primitiveCount || 0;
    lines.push(num + ' mesh primitives — how the GLB exporter split this material\'s geometry by face.');
  }

  return lines.join('\n');
}

function isAncestorChainExpanded(entry) {
  let p = entry.parentId == null ? null : nodeById.get(entry.parentId);
  while (p) {
    if (!p.expanded) return false;
    p = p.parentId == null ? null : nodeById.get(p.parentId);
  }
  return true;
}

function computeTriState(entry) {
  if (!entry.children.length) return entry.visible ? 'visible' : 'hidden';
  const states = entry.children.map(computeTriState);
  if (states.every(s => s === 'visible') && entry.visible) return 'visible';
  if (states.every(s => s === 'hidden') && !entry.visible) return 'hidden';
  return 'mixed';
}

function setSubtreeVisibility(entry, visible) {
  function walk(e) {
    e.visible = visible;
    for (const m of e.allMeshes) m.isVisible = visible;
    // Synthetic material-group entries have no Babylon node — skip setEnabled.
    if (e.node && e.node.setEnabled) e.node.setEnabled(visible);
    for (const c of e.children) walk(c);
  }
  walk(entry);
  renderTree();
  postVisibilityToServer();
}

// Tracks which entry is currently isolated (null = nothing isolated). When
// the user clicks the isolate icon a second time on the same entry, we
// un-isolate by restoring everything that was visible at the time of the
// FIRST click. Both the isolate AND the un-isolate go through
// pushVisibilityHistory so Ctrl+Z works on both.
let isolatedEntryId = null;

function isolateEntry(entry, opts) {
  // Toggle: second click on the same entry un-isolates (restores all).
  if (isolatedEntryId === entry.id) {
    showAllEntries();
    isolatedEntryId = null;
    return;
  }
  // ISOLATE: show only the meshes that belong to entry's subtree, hide
  // everything else. Works at any depth (Pin 1 / Pins group / chip top
  // level all behave correctly). Done at the per-mesh level (using
  // mesh.isVisible) instead of per-entry setEnabled so we don't get
  // tangled in parent-child setEnabled propagation.
  const visibleMeshIds = new Set();
  function collect(e) {
    for (const m of e.allMeshes) if (m && m.uniqueId != null) visibleMeshIds.add(m.uniqueId);
    for (const c of e.children) collect(c);
  }
  collect(entry);

  // Pass 1: per-mesh visibility from the visible set. Walks BOTH
  // the assemblyTree entries AND all scene meshes (in case the GLB
  // loader added meshes that aren't tracked in any tree entry).
  for (const e of assemblyTree) {
    for (const m of e.allMeshes) {
      if (!m || m.uniqueId == null) continue;
      m.isVisible = visibleMeshIds.has(m.uniqueId);
    }
  }
  const scene = viewer?.getScene?.();
  if (scene) {
    for (const m of scene.meshes) {
      if (!m || m.uniqueId == null) continue;
      if (['skyBox','ground','shadowGround'].includes(m.name)) continue;
      if ((m.name || '').startsWith('viewCube')) continue;
      if (!visibleMeshIds.has(m.uniqueId)) m.isVisible = false;
    }
  }
  // Pass 2: derive entry.visible (true if any of its meshes are visible).
  for (const e of assemblyTree) {
    let any = false;
    for (const m of e.allMeshes) {
      if (m && m.isVisible) { any = true; break; }
    }
    e.visible = any;
  }
  // Re-enable the host TransformNodes along the ancestor chain (in case
  // a previous setEnabled(false) is still hanging on them) so the picked
  // mesh gets actually rendered. Babylon's setEnabled cascades, so we
  // walk up from the entry and re-enable each.
  let cur = entry;
  while (cur) {
    if (cur.node && cur.node.setEnabled) cur.node.setEnabled(true);
    cur = cur.parentId == null ? null : nodeById.get(cur.parentId);
  }

  renderTree();
  postVisibilityToServer();
  isolatedEntryId = entry.id;
  if (opts && opts.frame) frameOnEntry(entry);
}

function showAllEntries() {
  for (const e of assemblyTree) {
    if (e.depth === 0) setSubtreeVisibility(e, true);
  }
  const scene = viewer?.getScene?.();
  if (scene) {
    for (const m of scene.meshes) {
      if (m && m.uniqueId != null) m.isVisible = true;
    }
  }
}

function postVisibilityToServer() {
  const map = {};
  for (const e of assemblyTree) map[e.name] = e.visible;
  fetch('api/visibility', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(map),
  }).catch(() => {});
}

let highlightLayer = null;
function getHighlight() {
  if (!highlightLayer) {
    highlightLayer = new BABYLON.HighlightLayer('hover-hl', scene, { mainTextureRatio: 1 });
    highlightLayer.innerGlow = false;
  }
  return highlightLayer;
}
function highlightEntry(entry, on) {
  const hl = getHighlight();
  for (const m of entry.allMeshes) {
    if (!m.material) continue;
    if (on) hl.addMesh(m, BABYLON.Color3.FromHexString('#4fc3f7'));
    else hl.removeMesh(m);
  }
}

function frameOnEntry(entry) {
  if (!entry.allMeshes.length) return;
  // Compute combined bbox.
  const bb = combinedBoundingBox(entry.allMeshes);
  if (!bb) return;
  const cam = scene.activeCamera;
  if (!cam) return;
  const center = bb.center;
  const radius = bb.radius * 1.3;
  if (cam.target) cam.target.copyFrom(center);
  if (typeof cam.radius === 'number') cam.radius = Math.max(radius, 0.05);
  // Use built-in zoomOn if available.
  if (cam.zoomOn) {
    try { cam.zoomOn(entry.allMeshes, true); } catch (e) { /* fall back to target/radius */ }
  }
}

function combinedBoundingBox(meshes) {
  let minV = null, maxV = null;
  for (const m of meshes) {
    if (!m.getBoundingInfo) continue;
    m.computeWorldMatrix(true);
    const bi = m.getBoundingInfo();
    const lo = bi.boundingBox.minimumWorld;
    const hi = bi.boundingBox.maximumWorld;
    if (!minV) { minV = lo.clone(); maxV = hi.clone(); }
    else {
      minV.x = Math.min(minV.x, lo.x); minV.y = Math.min(minV.y, lo.y); minV.z = Math.min(minV.z, lo.z);
      maxV.x = Math.max(maxV.x, hi.x); maxV.y = Math.max(maxV.y, hi.y); maxV.z = Math.max(maxV.z, hi.z);
    }
  }
  if (!minV) return null;
  const center = minV.add(maxV).scale(0.5);
  const radius = maxV.subtract(minV).length() * 0.5;
  return { min: minV, max: maxV, center, radius };
}

// =====================================================================
// 5. Search — dim non-matching rows + auto-expand ancestors of matches.
// =====================================================================

function applySearchFilter() {
  const q = (document.getElementById('sbSearch').value || '').trim().toLowerCase();
  const rows = document.querySelectorAll('.tree-row');
  if (!q) { rows.forEach(r => r.classList.remove('dimmed')); return; }
  const matchIds = new Set();
  for (const e of assemblyTree) {
    if (e.name.toLowerCase().includes(q)) {
      matchIds.add(e.id);
      // walk up
      let p = e.parentId == null ? null : nodeById.get(e.parentId);
      while (p) {
        matchIds.add(p.id);
        p.expanded = true;
        p = p.parentId == null ? null : nodeById.get(p.parentId);
      }
    }
  }
  rows.forEach(r => {
    const id = parseInt(r.dataset.id, 10);
    if (matchIds.has(id)) r.classList.remove('dimmed');
    else r.classList.add('dimmed');
  });
}

function setupSidebar() {
  const search = document.getElementById('sbSearch');
  let timer = null;
  search.addEventListener('input', () => {
    clearTimeout(timer);
    timer = setTimeout(() => { renderTree(); }, 80);
  });

  // Outline collapse — Fusion 360 Browser-style. The outline floats over the
  // canvas with a translucent bg; collapsing slides it off-screen and reveals
  // a slim vertical expand-tab at the canvas's left edge. State persists in
  // localStorage so a user who likes the canvas-fills-viewport feel keeps it
  // across reloads. Keyboard: 'o' toggles.
  const panel = document.getElementById('outlinePanel');
  const expander = document.getElementById('outlineExpander');
  const STORAGE_KEY = 'adom-step.outline.collapsed';
  function setCollapsed(collapsed) {
    panel.classList.toggle('collapsed', collapsed);
    document.body.classList.toggle('outline-collapsed', collapsed);
    try { localStorage.setItem(STORAGE_KEY, collapsed ? '1' : '0'); } catch (_) {}
  }
  // Restore last state on load — default expanded for first-time users.
  try {
    if (localStorage.getItem(STORAGE_KEY) === '1') setCollapsed(true);
  } catch (_) {}
  document.getElementById('outlineCollapse').onclick = () => setCollapsed(true);
  expander.onclick = () => setCollapsed(false);
  // Keyboard shortcut — 'o' toggles. Don't intercept while a text input is
  // focused (search box, inspect HUD inputs, measure HUD).
  document.addEventListener('keydown', (e) => {
    if (e.key !== 'o' && e.key !== 'O') return;
    if (e.ctrlKey || e.metaKey || e.altKey) return;
    const t = e.target;
    if (t && (t.tagName === 'INPUT' || t.tagName === 'TEXTAREA' || t.isContentEditable)) return;
    setCollapsed(!panel.classList.contains('collapsed'));
  });
}

// =====================================================================
// 6. Visibility undo / redo
// =====================================================================

function snapshotVisibility() {
  const snap = {};
  for (const e of assemblyTree) snap[e.id] = e.visible;
  return snap;
}
function applyVisibilitySnapshot(snap) {
  for (const e of assemblyTree) {
    if (snap[e.id] !== undefined && snap[e.id] !== e.visible) {
      e.visible = snap[e.id];
      for (const m of e.allMeshes) m.isVisible = snap[e.id];
      if (e.node && e.node.setEnabled) e.node.setEnabled(snap[e.id]);
    }
  }
  renderTree();
  postVisibilityToServer();
}
function pushVisibilityHistory(mutate) {
  const before = snapshotVisibility();
  mutate();
  const after = snapshotVisibility();
  visibilityHistory.push({ before, after });
  if (visibilityHistory.length > 50) visibilityHistory.shift();
  visibilityRedo = [];
}
function undoVisibility() {
  const last = visibilityHistory.pop();
  if (!last) return;
  applyVisibilitySnapshot(last.before);
  visibilityRedo.push(last);
}
function redoVisibility() {
  const last = visibilityRedo.pop();
  if (!last) return;
  applyVisibilitySnapshot(last.after);
  visibilityHistory.push(last);
}

// =====================================================================
// 7. Context menu
// =====================================================================

let ctxEntry = null;
function openContextMenu(x, y, entry) {
  ctxEntry = entry;
  const m = document.getElementById('ctxMenu');
  // Sync downstream-app extras (chipsmith adds "Move to decorative
  // branch" here). Extras are reset every open so toggle-state labels
  // stay current with the entry under the cursor.
  syncContextMenuExtras(entry);
  m.classList.add('open');
  m.style.left = x + 'px';
  m.style.top = y + 'px';
}

// Downstream apps register extra context-menu items via
// window.adomStepCtxMenuExtras = [{
//   id: 'mark-decorative',                  // unique within the menu
//   label: (entry) => 'Move to decorative branch on bake',
//   tooltip: (entry) => '…',
//   visibleFor: (entry) => true,            // optional filter
//   onClick: (entry) => { … },
// }, …]
// Items are appended (with a separator) at the bottom of the menu the
// first time the menu opens; on subsequent opens, only labels +
// visibility are updated. The host shell never has to know what the
// downstream app's verbs mean.
function syncContextMenuExtras(entry) {
  const m = document.getElementById('ctxMenu');
  const extras = (window.adomStepCtxMenuExtras || []);
  // Drop previous extras so we don't accumulate duplicates.
  m.querySelectorAll('.ctx-extra, .ctx-extra-sep').forEach(el => el.remove());
  if (!extras.length) return;
  const sep = document.createElement('div');
  sep.className = 'ctx-sep ctx-extra-sep';
  m.appendChild(sep);
  for (const ex of extras) {
    if (typeof ex.visibleFor === 'function' && !ex.visibleFor(entry)) continue;
    const it = document.createElement('div');
    it.className = 'ctx-item ctx-extra';
    it.dataset.act = 'extra:' + ex.id;
    it.textContent = (typeof ex.label === 'function' ? ex.label(entry) : ex.label);
    if (typeof ex.tooltip === 'function') it.setAttribute('data-tooltip', ex.tooltip(entry) || '');
    else if (ex.tooltip)                   it.setAttribute('data-tooltip', ex.tooltip);
    m.appendChild(it);
  }
}
function closeContextMenu() {
  document.getElementById('ctxMenu').classList.remove('open');
  ctxEntry = null;
}
function setupContextMenu() {
  document.addEventListener('click', closeContextMenu);
  const m = document.getElementById('ctxMenu');
  m.addEventListener('click', (e) => {
    e.stopPropagation();
    const act = e.target.dataset.act;
    if (!act || !ctxEntry) { closeContextMenu(); return; }
    const entry = ctxEntry;
    closeContextMenu();
    // Visibility-mutating actions go through pushVisibilityHistory so Ctrl+Z
    // can undo them. Non-mutating actions (reveal, zoom, copy, properties)
    // run directly to keep the undo stack clean.
    switch (act) {
      case 'reveal':
        findInOutline(entry);
        break;
      case 'isolate':
        pushVisibilityHistory(() => isolateEntry(entry, { frame: true }));
        break;
      case 'hide-others':
        pushVisibilityHistory(() => {
          for (const e of assemblyTree) {
            if (e.depth === 0 && e.id !== ancestorAt0(entry).id) setSubtreeVisibility(e, false);
          }
        });
        break;
      case 'show':
        pushVisibilityHistory(() => setSubtreeVisibility(entry, true));
        break;
      case 'hide':
        pushVisibilityHistory(() => setSubtreeVisibility(entry, false));
        // Flash the row in the outline so the user can find it again to
        // restore — without this, a hidden item visually disappears from
        // the canvas and the user has no breadcrumb back to its row.
        // (Ctrl+Z also undoes; this is the find-by-eye fallback.)
        findInOutline(entry);
        showToast('Hid ' + entry.name + ' — flashed in outline (Ctrl+Z undoes)', 'ok');
        break;
      case 'zoom':
        frameOnEntry(entry);
        break;
      case 'copy-name':
        navigator.clipboard.writeText(entry.name).catch(() => {});
        showToast('Copied: ' + entry.name, 'ok');
        break;
      case 'copy-json': {
        // Serialize a paste-able snapshot of the entry. Skip mesh refs
        // + circular children list — keep id/name/depth/parent/kind +
        // computed bbox + overlay tags so a bug report has all the
        // useful identity info.
        const blob = {
          id: entry.id,
          name: entry.name,
          depth: entry.depth,
          parentId: entry.parentId,
          kind: entry.kind || null,
          visible: entry.visible,
          isOverlay: !!entry.isOverlay,
          overlayGroup: entry.overlayGroup || null,
          meshCount: (entry.allMeshes || []).length,
          childCount: (entry.children || []).length,
        };
        try {
          const bb = combinedBoundingBox(entry.allMeshes || []);
          if (bb) {
            const SCENE_TO_MM = 1000;
            blob.bbox_mm = {
              min: [bb.min.x, bb.min.y, bb.min.z].map(v => v * SCENE_TO_MM),
              max: [bb.max.x, bb.max.y, bb.max.z].map(v => v * SCENE_TO_MM),
              size: [(bb.max.x - bb.min.x), (bb.max.y - bb.min.y), (bb.max.z - bb.min.z)].map(v => v * SCENE_TO_MM),
            };
          }
        } catch (_) {}
        const json = JSON.stringify(blob, null, 2);
        navigator.clipboard.writeText(json).catch(() => {});
        showToast('Copied JSON for ' + entry.name, 'ok');
        break;
      }
      case 'properties':
        pinInspectCard(entry);
        break;
      default:
        if (act && act.startsWith('extra:')) {
          const id = act.slice('extra:'.length);
          const ex = (window.adomStepCtxMenuExtras || []).find(e => e.id === id);
          if (ex && typeof ex.onClick === 'function') ex.onClick(entry);
        }
        break;
    }
  });
}
function ancestorAt0(entry) {
  let cur = entry;
  while (cur && cur.depth > 0) cur = cur.parentId == null ? null : nodeById.get(cur.parentId);
  return cur || entry;
}

// =====================================================================
// 8. Toolbar
// =====================================================================

function setupToolbar() {
  document.getElementById('tbMeasure').onclick = () => toggleMeasure();

  // Toggle starts OFF (app-level override of 3d-viewer-design §4d default-on,
  // see boot() for rationale). User flips it on when they want contact shadow.
  let groundOn = false;
  const groundBtn = document.getElementById('tbGround');
  groundBtn.classList.remove('active');
  groundBtn.onclick = (e) => {
    groundOn = !groundOn;
    viewer.setGroundVisible(groundOn);
    e.currentTarget.classList.toggle('active', groundOn);
  };

  // Per §8a: world-origin axes toggle, default ON.
  // Per §8b: mesh-local axes toggle, default OFF.
  // Bottom-fill light — toggles a HemisphericLight under the model so the
  // user can see BGA balls / QFN pads / through-hole leg bottoms. Persists
  // via localStorage. Keyboard 'B' toggles (skipped while a text input is
  // focused).
  const bottomBtn = document.getElementById('tbBottomLight');
  const BOTTOM_LIGHT_KEY = 'adom-step.bottomLight';
  function applyBottomLight(on) {
    viewer.setBottomLight(on);
    bottomBtn.classList.toggle('active', on);
    try { localStorage.setItem(BOTTOM_LIGHT_KEY, on ? '1' : '0'); } catch (_) {}
  }
  // Restore last state on init.
  try {
    if (localStorage.getItem(BOTTOM_LIGHT_KEY) === '1') applyBottomLight(true);
  } catch (_) {}
  bottomBtn.onclick = () => applyBottomLight(!viewer.getBottomLightState());
  document.addEventListener('keydown', (e) => {
    if (e.key !== 'b' && e.key !== 'B') return;
    if (e.ctrlKey || e.metaKey || e.altKey) return;
    const t = e.target;
    if (t && (t.tagName === 'INPUT' || t.tagName === 'TEXTAREA' || t.isContentEditable)) return;
    applyBottomLight(!viewer.getBottomLightState());
  });

  document.getElementById('tbAxes').onclick = (e) => {
    const next = !viewer.getAxesState().world;
    viewer.toggleAxes('world', next);
    e.currentTarget.classList.toggle('active', next);
  };
  document.getElementById('tbMeshAxes').onclick = (e) => {
    const next = !viewer.getAxesState().meshLocal;
    viewer.toggleAxes('mesh-local', next);
    e.currentTarget.classList.toggle('active', next);
  };

  // Babylon Inspector — use the canonical viewer's showDebugLayer /
  // hideDebugLayer wrappers. They `await import('@babylonjs/inspector')`
  // from the bundled dependency BEFORE calling scene.debugLayer.show(),
  // which avoids the CDN-load + frozen-BABYLON-namespace mess. (This
  // is the same ESM-load path adom-tsci / chiplinter use.)
  let inspectorOpen = false;
  document.getElementById('tbInspect').onclick = async (e) => {
    const btn = e.currentTarget;
    try {
      if (inspectorOpen) {
        await viewer.hideDebugLayer();
        inspectorOpen = false;
        btn.classList.remove('active');
        showToast('Inspector closed', 'ok');
      } else {
        btn.classList.add('active');
        showToast('Loading Babylon Inspector…', 'ok');
        await viewer.showDebugLayer();
        inspectorOpen = true;
        showToast('Inspector ready', 'ok');
      }
    } catch (err) {
      console.error('Inspector failed:', err);
      showToast('Inspector error: ' + (err && err.message ? err.message : err), 'err');
      btn.classList.remove('active');
    }
  };

  // Strobe is removed from adom-step (out of scope for a STEP file
  // viewer — strobe-each-pin is a chip-fetcher / chiplinter concept).
  // Pin clustering itself stays for the components-outline rows.
}

function setupViewButtons() {
  // Toolbar ViewCube clicks: preserve the user's current orbit center +
  // radius per 3d-viewer-design §7. Don't pass frameWhole.
  document.querySelectorAll('[data-view]').forEach(btn => {
    btn.onclick = () => setView(btn.dataset.view);
  });
}

function setView(name, opts) {
  // ViewCube preset for the named direction. Per 3d-viewer-design §7,
  // toolbar ViewCube clicks should preserve the current orbit center +
  // radius (just rotate). CLI/AI calls (opts.frameWhole = true) re-frame
  // the whole model first so an AI driving the viewer always sees the
  // full part regardless of prior isolate/measure state.
  const cam = scene.activeCamera;
  if (!cam || typeof cam.alpha !== 'number') return;

  if (opts && opts.frameWhole) {
    showAllEntries();        // restore visibility from any prior isolate
    viewer.goHome();         // re-frame on full bounds
  }

  const presets = {
    front:  { alpha: -Math.PI / 2, beta: Math.PI / 2 },
    back:   { alpha: Math.PI / 2,  beta: Math.PI / 2 },
    left:   { alpha: Math.PI,      beta: Math.PI / 2 },
    right:  { alpha: 0,            beta: Math.PI / 2 },
    top:    { alpha: -Math.PI / 2, beta: 0.001 },
    bottom: { alpha: -Math.PI / 2, beta: Math.PI - 0.001 },
    iso:    { alpha: -Math.PI / 4, beta: Math.PI / 3 },
    home:   null,
  };
  const p = presets[name];
  if (name === 'home' || !p) { viewer.goHome(); return; }
  cam.alpha = p.alpha;
  cam.beta = p.beta;
}

// =====================================================================
// 9. Drop zone
// =====================================================================

function setupDropzone() {
  ['dragenter', 'dragover'].forEach(ev => {
    window.addEventListener(ev, (e) => {
      e.preventDefault();
      document.body.classList.add('dragging');
    });
  });
  ['dragleave', 'drop'].forEach(ev => {
    window.addEventListener(ev, (e) => {
      if (ev === 'dragleave' && e.target !== document && e.relatedTarget) return;
      document.body.classList.remove('dragging');
    });
  });
  window.addEventListener('drop', async (e) => {
    e.preventDefault();
    const file = e.dataTransfer.files[0];
    if (!file) return;
    if (!/\.(step|stp)$/i.test(file.name)) {
      showToast('Not a .step / .stp file', 'err');
      return;
    }
    setSplash('Converting ' + file.name + '...');
    const buf = await file.arrayBuffer();
    try {
      const r = await fetch('api/load', {
        method: 'POST',
        headers: { 'X-Filename': file.name },
        body: buf,
      });
      const body = await r.json();
      if (!r.ok || body.error) {
        setSplash(null);
        showToast('Load failed: ' + (body.error || r.statusText), 'err');
        return;
      }
      setSourceLabel(file.name, 'upload');
      materialsCache = body.materials || [];
      await loadModelUrl('model.glb?cb=' + Date.now());
      showToast(file.name + (body.cache_hit ? ' (cached)' : ' converted'), 'ok');
    } catch (err) {
      setSplash(null);
      showToast('Load error: ' + err.message, 'err');
    }
  });
}

// =====================================================================
// 10. Measure tool
// =====================================================================

let measureActive = false;
let measureFilter = 'smart';
let measurePicks = []; // [{point, mesh, marker, type}]

function toggleMeasure() {
  measureActive = !measureActive;
  document.getElementById('tbMeasure').classList.toggle('active', measureActive);
  document.getElementById('measureHud').classList.toggle('open', measureActive);
  if (!measureActive) {
    clearMeasure();
  } else {
    renderMeasureHud();
  }
}

function clearMeasure() {
  for (const p of measurePicks) {
    if (p.markers) for (const m of p.markers) m.dispose();
    else if (p.marker) p.marker.dispose();   // legacy single-mesh shape
  }
  if (measureLine) { measureLine.dispose(); measureLine = null; }
  if (measureLabel) { measureLabel.dispose(); measureLabel = null; }
  measurePicks = [];
  clearMeasurePreview();
  renderMeasureHud();
}

function setupMeasureTool() {
  document.getElementById('measureClose').onclick = () => toggleMeasure();
  document.querySelectorAll('.mb-filter').forEach(btn => {
    btn.onclick = () => {
      measureFilter = btn.dataset.filter;
      document.querySelectorAll('.mb-filter').forEach(b => b.classList.toggle('active', b === btn));
    };
  });

  scene.onPointerObservable.add((pi) => {
    if (!measureActive) return;

    // Click commits a measurement at the current snap point.
    if (pi.type === BABYLON.PointerEventTypes.POINTERTAP && pi.event.button === 0) {
      const pick = scene.pick(scene.pointerX, scene.pointerY, (m) => isPickableMesh(m));
      if (!pick || !pick.hit || !pick.pickedPoint) return;
      addMeasurePick(pick);
      return;
    }

    // Hover renders a translucent preview of what would commit on click.
    // Required by human-ui-patterns §2 (click previews) and matches Fusion 360
    // / SolidWorks / Onshape behavior.
    if (pi.type === BABYLON.PointerEventTypes.POINTERMOVE) {
      const pick = scene.pick(scene.pointerX, scene.pointerY, (m) => isPickableMesh(m));
      if (!pick || !pick.hit || !pick.pickedPoint) {
        clearMeasurePreview();
        return;
      }
      const snap = computeMeasureSnap(pick, measureFilter);
      drawMeasurePreview(snap);
    }
  });
}

function isPickableMesh(m) {
  if (!m) return false;
  if (m.name && (m.name.startsWith('measure-') || m.name.startsWith('section-') || m.name.startsWith('viewCube'))) return false;
  if (m.name === 'shadowGround' || m.name === 'ground' || m.name === 'skyBox') return false;
  return m.isEnabled() && m.isVisible !== false;
}

// Compute the snap point + auxiliary geometry for a hover/click pick under
// the current filter. Returns: { kind, point, mesh, edgeA?, edgeB?, faceTri? }
// Smart-mode priority is edges > faces > vertexes (per user feedback) — edges
// are the most semantically meaningful pick on a mechanical part, faces are
// next, and vertexes are last because they're often dense on tessellated
// curves and snap to noise.
function computeMeasureSnap(pick, filter) {
  const point = pick.pickedPoint.clone();
  const mesh = pick.pickedMesh;
  // Snap radius scales with scene extent so it feels right on a 2 mm SOT-23
  // and a 200 mm board alike. ~2% of scene extent in scene-meters.
  const ext = sceneExtentMeters();
  const snapRadius = Math.max(ext * 0.015, 0.0003);

  function tryEdge() {
    return nearestEdgeFull(mesh, pick, snapRadius);
  }
  function tryFace() {
    // 1° tolerance for "coplanar" — same threshold most CAD tools use.
    return findConnectedFace(mesh, pick, 1);
  }
  function tryVertex() {
    const v = nearestVertex(mesh, point, snapRadius);
    return v ? { point: v } : null;
  }

  if (filter === 'body') {
    const bb = combinedBoundingBox([mesh]);
    if (bb) return { kind: 'body', point: bb.center.clone(), mesh };
    return { kind: 'point', point, mesh };
  }

  if (filter === 'edge') {
    const e = tryEdge();
    if (e) return { kind: 'edge', point: e.point, mesh, edgeA: e.a, edgeB: e.b };
    return { kind: 'point', point, mesh };
  }
  if (filter === 'face') {
    const f = tryFace();
    return { kind: 'face', point: f ? f.point : point, mesh, face: f, faceTri: f && f.tri };
  }
  if (filter === 'vertex') {
    const v = tryVertex();
    if (v) return { kind: 'vertex', point: v.point, mesh };
    return { kind: 'point', point, mesh };
  }

  // Smart: edge > face > vertex priority (per user feedback).
  const e = tryEdge();
  if (e) return { kind: 'edge', point: e.point, mesh, edgeA: e.a, edgeB: e.b };
  const f = tryFace();
  if (f) return { kind: 'face', point: f.point, mesh, face: f, faceTri: f.tri };
  const v = tryVertex();
  if (v) return { kind: 'vertex', point: v.point, mesh };
  return { kind: 'point', point, mesh };
}

function addMeasurePick(pick) {
  if (measurePicks.length >= 2) clearMeasure();
  const snap = computeMeasureSnap(pick, measureFilter);
  const markerMeshes = makeMeasureMarker(snap, measurePicks.length + 1);
  // Preserve the snap's auxiliary geometry (edgeA/edgeB/faceTri) so
  // computeMeasureEndpoints can do edge-edge shortest-segment, etc.
  measurePicks.push({
    point: snap.point, mesh: snap.mesh, kind: snap.kind, markers: markerMeshes,
    edgeA: snap.edgeA, edgeB: snap.edgeB,
    face: snap.face, faceTri: snap.faceTri,
  });
  if (measurePicks.length === 2) drawMeasureLine();
  clearMeasurePreview();
  renderMeasureHud();
}

function nearestVertex(mesh, point, snapRadius) {
  if (!mesh.getVerticesData) return null;
  const positions = mesh.getVerticesData(BABYLON.VertexBuffer.PositionKind);
  if (!positions) return null;
  const matrix = mesh.computeWorldMatrix(true);
  let best = null;
  let bestD = snapRadius * snapRadius;
  const tmp = new BABYLON.Vector3();
  for (let i = 0; i < positions.length; i += 3) {
    tmp.set(positions[i], positions[i + 1], positions[i + 2]);
    const w = BABYLON.Vector3.TransformCoordinates(tmp, matrix);
    const dx = w.x - point.x, dy = w.y - point.y, dz = w.z - point.z;
    const d2 = dx * dx + dy * dy + dz * dz;
    if (d2 < bestD) { bestD = d2; best = w.clone(); }
  }
  return best;
}

function nearestEdgeMidpoint(mesh, pick, snapRadius) {
  const e = nearestEdgeFull(mesh, pick, snapRadius);
  return e ? e.point : null;
}

// Returns the closest edge to the pick point as { a, b, point } where point
// is the closest point ON that edge to the cursor (not necessarily the
// midpoint). Distance metric: cursor-to-line, not cursor-to-midpoint, so the
// snap is stable as the user slides the cursor along the edge.
function nearestEdgeFull(mesh, pick, snapRadius) {
  if (!mesh.getIndices || !mesh.getVerticesData || pick.faceId == null) return null;
  const positions = mesh.getVerticesData(BABYLON.VertexBuffer.PositionKind);
  const indices = mesh.getIndices();
  if (!positions || !indices) return null;
  const matrix = mesh.computeWorldMatrix(true);
  const f = pick.faceId;
  if (f * 3 + 2 >= indices.length) return null;
  const ia = indices[f * 3], ib = indices[f * 3 + 1], ic = indices[f * 3 + 2];
  const verts = [ia, ib, ic].map(idx => {
    const p = new BABYLON.Vector3(positions[idx * 3], positions[idx * 3 + 1], positions[idx * 3 + 2]);
    return BABYLON.Vector3.TransformCoordinates(p, matrix);
  });
  const c = pick.pickedPoint;
  let best = null;
  let bestD = snapRadius * snapRadius;
  for (let i = 0; i < 3; i++) {
    const a = verts[i], b = verts[(i + 1) % 3];
    const ab = b.subtract(a);
    const lenSq = ab.lengthSquared();
    if (lenSq <= 1e-12) continue;
    let t = BABYLON.Vector3.Dot(c.subtract(a), ab) / lenSq;
    t = Math.max(0, Math.min(1, t));
    const closest = a.add(ab.scale(t));
    const dx = closest.x - c.x, dy = closest.y - c.y, dz = closest.z - c.z;
    const d2 = dx * dx + dy * dy + dz * dz;
    if (d2 < bestD) { bestD = d2; best = { a: a.clone(), b: b.clone(), point: closest.clone() }; }
  }
  return best;
}

// Find the LOGICAL face that contains the picked triangle by flood-filling
// adjacent coplanar triangles. Returns { worldPositions, indices, centroid,
// normal, point, triCount, tri /* legacy: first triangle */ } in world space.
//
// User feedback (May 2026): showing a single triangle for the "Face" filter
// was confusing — users think of a flat surface as ONE face, not "the
// triangle the cursor happened to land on". Flood-fill groups all triangles
// whose normals match within 1° (cos ≈ 0.9998), giving the human-meaningful
// "face". Curved surfaces (gull-wing pin tops, chip leads) break out of the
// fill at the curvature boundary, so each curved patch stays its own face.
function findConnectedFace(mesh, pick, epsilonDeg) {
  if (!mesh.getIndices || !mesh.getVerticesData || pick.faceId == null) return null;
  const positions = mesh.getVerticesData(BABYLON.VertexBuffer.PositionKind);
  const indices = mesh.getIndices();
  if (!positions || !indices) return null;
  const matrix = mesh.computeWorldMatrix(true);
  const numTris = indices.length / 3;
  if (pick.faceId < 0 || pick.faceId >= numTris) return null;

  function vec(i) {
    return new BABYLON.Vector3(positions[i * 3], positions[i * 3 + 1], positions[i * 3 + 2]);
  }
  function triNormal(fi) {
    const ia = indices[fi * 3], ib = indices[fi * 3 + 1], ic = indices[fi * 3 + 2];
    const a = vec(ia), b = vec(ib), c = vec(ic);
    const n = BABYLON.Vector3.Cross(b.subtract(a), c.subtract(a));
    if (n.lengthSquared() < 1e-20) return null;
    return n.normalize();
  }
  function edgeKey(a, b) { return Math.min(a, b) + ',' + Math.max(a, b); }

  // Edge → triangle adjacency.
  const edgeMap = new Map();
  for (let f = 0; f < numTris; f++) {
    const ia = indices[f * 3], ib = indices[f * 3 + 1], ic = indices[f * 3 + 2];
    const edges = [[ia, ib], [ib, ic], [ic, ia]];
    for (const e of edges) {
      const k = edgeKey(e[0], e[1]);
      let arr = edgeMap.get(k);
      if (!arr) { arr = []; edgeMap.set(k, arr); }
      arr.push(f);
    }
  }

  const seedNormal = triNormal(pick.faceId);
  if (!seedNormal) return null;
  const cosEps = Math.cos((epsilonDeg || 1) * Math.PI / 180);
  const visited = new Set([pick.faceId]);
  const stack = [pick.faceId];
  while (stack.length) {
    const f = stack.pop();
    const ia = indices[f * 3], ib = indices[f * 3 + 1], ic = indices[f * 3 + 2];
    const edges = [[ia, ib], [ib, ic], [ic, ia]];
    for (const e of edges) {
      const list = edgeMap.get(edgeKey(e[0], e[1]));
      if (!list) continue;
      for (const n of list) {
        if (visited.has(n)) continue;
        const nn = triNormal(n);
        if (!nn) continue;
        if (BABYLON.Vector3.Dot(seedNormal, nn) >= cosEps) {
          visited.add(n);
          stack.push(n);
        }
      }
    }
  }

  // Bake all triangles into one set of world-space positions + indices,
  // and compute the AREA-WEIGHTED centroid (the proper geometric centroid
  // of the polygon, not just the average of triangle vertices — large
  // triangles influence the centroid more than tiny ones).
  const worldPositions = [];
  const triIndices = [];
  let cx = 0, cy = 0, cz = 0, totalArea = 0, vIdx = 0;
  for (const f of visited) {
    const ia = indices[f * 3], ib = indices[f * 3 + 1], ic = indices[f * 3 + 2];
    const wa = BABYLON.Vector3.TransformCoordinates(vec(ia), matrix);
    const wb = BABYLON.Vector3.TransformCoordinates(vec(ib), matrix);
    const wc = BABYLON.Vector3.TransformCoordinates(vec(ic), matrix);
    worldPositions.push(wa.x, wa.y, wa.z, wb.x, wb.y, wb.z, wc.x, wc.y, wc.z);
    triIndices.push(vIdx, vIdx + 1, vIdx + 2, vIdx + 2, vIdx + 1, vIdx);
    vIdx += 3;
    // Triangle area = 0.5 × |edge1 × edge2|
    const cross = BABYLON.Vector3.Cross(wb.subtract(wa), wc.subtract(wa));
    const area = cross.length() * 0.5;
    // Triangle centroid = average of its 3 vertices
    const tcx = (wa.x + wb.x + wc.x) / 3;
    const tcy = (wa.y + wb.y + wc.y) / 3;
    const tcz = (wa.z + wb.z + wc.z) / 3;
    cx += tcx * area; cy += tcy * area; cz += tcz * area;
    totalArea += area;
  }
  const centroid = totalArea > 0
    ? new BABYLON.Vector3(cx / totalArea, cy / totalArea, cz / totalArea)
    : new BABYLON.Vector3(worldPositions[0], worldPositions[1], worldPositions[2]);

  // Legacy `tri` field for backwards compat — first triangle as 3 Vector3s.
  const f0 = pick.faceId;
  const tri = [indices[f0 * 3], indices[f0 * 3 + 1], indices[f0 * 3 + 2]].map(idx =>
    BABYLON.Vector3.TransformCoordinates(vec(idx), matrix)
  );

  return {
    worldPositions, indices: triIndices, centroid,
    normal: seedNormal, point: pick.pickedPoint.clone(),
    triCount: visited.size, tri,
  };
}

// Backwards-compat shim.
function faceTriFromPick(mesh, pick) {
  return findConnectedFace(mesh, pick, 1);
}

function sceneExtentMeters() {
  // Measure / section / pivot markers must scale with the scene, not be
  // hard-coded — a 1m sphere on a 12 mm chip means the camera sits INSIDE
  // the marker. Scale by current scene bounds. (Per 3d-viewer-design §6c.)
  const meshes = scene.meshes.filter(isPickableMesh);
  if (!meshes.length) return 0.05; // 50mm fallback
  const bb = combinedBoundingBox(meshes);
  return bb ? bb.radius * 2 : 0.05;
}

// Build the committed marker meshes for a confirmed pick. Shape matches
// the snap kind so the user sees the same geometry they hovered: edge →
// tube, vertex → sphere, face → translucent triangle, body → bbox volume.
// The dimension line still connects the two pick.point values regardless.
function makeMeasureMarker(snap, label) {
  const ext = sceneExtentMeters();
  const meshes = [];

  function makeMat(name, alpha) {
    const m = new BABYLON.StandardMaterial(name, scene);
    m.disableLighting = true;
    m.emissiveColor = BABYLON.Color3.FromHexString('#00b8b1');
    m.alpha = alpha == null ? 1 : alpha;
    m.backFaceCulling = false;
    return m;
  }
  function reg(m) {
    m.renderingGroupId = 3;
    m.isPickable = false;
    if (measureGlowLayer) measureGlowLayer.addIncludedOnlyMesh(m);
    meshes.push(m);
  }

  if (snap.kind === 'edge' && snap.edgeA && snap.edgeB) {
    const tube = BABYLON.MeshBuilder.CreateTube('measure-edge-' + label, {
      path: [snap.edgeA, snap.edgeB], radius: ext * 0.005,
    }, scene);
    tube.material = makeMat('measure-edge-mat-' + label, 1);
    reg(tube);
  } else if (snap.kind === 'face' && snap.face) {
    // Whole logical face on commit, same as the preview.
    const facePlane = new BABYLON.Mesh('measure-face-' + label, scene);
    const vd = new BABYLON.VertexData();
    vd.positions = snap.face.worldPositions;
    vd.indices = snap.face.indices;
    vd.applyToMesh(facePlane);
    facePlane.material = makeMat('measure-face-mat-' + label, 0.65);
    reg(facePlane);
  } else if (snap.kind === 'body') {
    const bb = combinedBoundingBox([snap.mesh]);
    if (bb) {
      const box = BABYLON.MeshBuilder.CreateBox('measure-body-' + label, {
        width:  Math.max(bb.max.x - bb.min.x, ext * 0.005),
        height: Math.max(bb.max.y - bb.min.y, ext * 0.005),
        depth:  Math.max(bb.max.z - bb.min.z, ext * 0.005),
      }, scene);
      box.position = bb.center.clone();
      box.material = makeMat('measure-body-mat-' + label, 0.22);
      reg(box);
    }
  } else {
    // 'vertex' or fallback 'point' — sphere at the snap point.
    const sphere = BABYLON.MeshBuilder.CreateSphere('measure-vertex-' + label,
      { diameter: ext * 0.04 }, scene);
    sphere.position = snap.point.clone();
    sphere.material = makeMat('measure-vertex-mat-' + label, 1);
    reg(sphere);
  }

  return meshes;
}

// =====================================================================
// Measure preview — emissive geometric helpers that highlight whatever
// the next click would snap to. Wrapped in a GlowLayer so previews bloom
// against the dark scene. NO cursor sphere — the geometric primitive
// itself (edge tube / face triangle / vertex ring / body sphere) IS the
// preview. The HUD's "Snap: <kind>" badge tells the user what they're
// looking at.
// =====================================================================
let measurePreviewMeshes = [];
let measureGlowLayer = null;

function ensureGlowLayer() {
  if (measureGlowLayer) return measureGlowLayer;
  measureGlowLayer = new BABYLON.GlowLayer('measure-glow', scene, {
    mainTextureFixedSize: 1024,
    blurKernelSize: 64,
  });
  measureGlowLayer.intensity = 0.7;
  // Per-mesh emissive override: vertex spheres glow at ~30% so the bloom
  // doesn't wash out the material's alpha=0.5 (otherwise the back face's
  // emissive light fills the front face's see-through). Edges / faces /
  // bodies use full bright emissive — they're thin/flat and the glow
  // doesn't fight the transparency the same way.
  measureGlowLayer.customEmissiveColorSelector = (mesh, _sub, _mat, result) => {
    const isVertex = mesh && mesh.name && mesh.name.startsWith('measure-prev-vertex');
    if (isVertex) {
      result.set(0.0, 0.35, 0.34, 1.0);   // dim teal — gentle bloom
    } else {
      result.set(0.0, 0.72, 0.69, 1.0);   // full brand teal
    }
  };
  return measureGlowLayer;
}

function clearMeasurePreview() {
  if (measureGlowLayer) {
    for (const m of measurePreviewMeshes) measureGlowLayer.removeIncludedOnlyMesh(m);
  }
  for (const m of measurePreviewMeshes) m.dispose();
  measurePreviewMeshes = [];
  setMeasureSnapBadge(null);
}

function setMeasureSnapBadge(kind) {
  const el = document.getElementById('measureSnapKind');
  if (!el) return;
  if (!kind) { el.textContent = '—'; el.removeAttribute('data-kind'); return; }
  // Title-case for display.
  const labels = { edge: 'Edge', face: 'Face', vertex: 'Vertex', body: 'Body', point: 'Point' };
  el.textContent = labels[kind] || kind;
  el.setAttribute('data-kind', kind);
}

// Preview rendering parameters — kept in one place so they stay coherent.
// User feedback 2026-05-02: previews must be ~50% transparent (so the user
// can see the underlying geometry they're picking) and ~30% smaller than
// the committed marker so the two are visually distinct.
const PREVIEW_ALPHA = 0.5;
const PREVIEW_SIZE_SCALE = 0.7;

function previewMaterial(name) {
  const mat = new BABYLON.StandardMaterial(name, scene);
  mat.disableLighting = true;
  mat.emissiveColor = BABYLON.Color3.FromHexString('#00b8b1'); // brand teal
  mat.alpha = PREVIEW_ALPHA;
  mat.backFaceCulling = false;
  return mat;
}

function drawMeasurePreview(snap) {
  clearMeasurePreview();
  if (!snap) return;
  setMeasureSnapBadge(snap.kind);
  const ext = sceneExtentMeters();
  const glow = ensureGlowLayer();
  const S = PREVIEW_SIZE_SCALE;

  function regGlow(m) {
    m.renderingGroupId = 3;
    m.isPickable = false;
    glow.addIncludedOnlyMesh(m);
    measurePreviewMeshes.push(m);
  }

  if (snap.kind === 'edge' && snap.edgeA && snap.edgeB) {
    const tube = BABYLON.MeshBuilder.CreateTube('measure-prev-edge', {
      path: [snap.edgeA, snap.edgeB], radius: ext * 0.004 * S,
    }, scene);
    tube.material = previewMaterial('measure-prev-edge-mat');
    regGlow(tube);
    return;
  }

  if (snap.kind === 'face' && snap.face) {
    // Show the FULL logical face (all coplanar adjacent triangles), not
    // just the picked triangle. Per user feedback May 2026 — humans think
    // of a flat surface as one face, not as the triangulation underneath.
    const facePlane = new BABYLON.Mesh('measure-prev-face', scene);
    const vd = new BABYLON.VertexData();
    vd.positions = snap.face.worldPositions;
    vd.indices = snap.face.indices;
    vd.applyToMesh(facePlane);
    facePlane.material = previewMaterial('measure-prev-face-mat');
    regGlow(facePlane);
    return;
  }

  if (snap.kind === 'vertex') {
    // Translucent sphere AT the vertex (not a ring around it) with a
    // softened glow so the alpha-0.5 transparency actually shows. The
    // GlowLayer's customEmissiveColorSelector dims spheres specifically
    // so the bloom doesn't fill the see-through.
    const sphere = BABYLON.MeshBuilder.CreateSphere('measure-prev-vertex', {
      diameter: ext * 0.025 * S, segments: 24,
    }, scene);
    sphere.position = snap.point.clone();
    const mat = new BABYLON.StandardMaterial('measure-prev-vertex-mat', scene);
    mat.disableLighting = true;
    mat.emissiveColor = BABYLON.Color3.FromHexString('#00b8b1');
    mat.alpha = PREVIEW_ALPHA;
    mat.backFaceCulling = true;       // back face would fill the see-through
    mat.alphaMode = BABYLON.Engine.ALPHA_COMBINE;
    sphere.material = mat;
    regGlow(sphere);
    return;
  }

  if (snap.kind === 'body') {
    const bb = combinedBoundingBox([snap.mesh]);
    if (!bb) return;
    const box = BABYLON.MeshBuilder.CreateBox('measure-prev-body', {
      width:  Math.max(bb.max.x - bb.min.x, ext * 0.005),
      height: Math.max(bb.max.y - bb.min.y, ext * 0.005),
      depth:  Math.max(bb.max.z - bb.min.z, ext * 0.005),
    }, scene);
    box.position = bb.center.clone();
    box.material = previewMaterial('measure-prev-body-mat');
    regGlow(box);
    return;
  }

  // 'point' fallback: no preview, let the user keep moving until they
  // land on a pickable feature.
}

// =====================================================================
// Dimension geometry — compute the SHORTEST path between two picks given
// their snap-kinds. Edge-edge becomes skew-line shortest segment; vertex-
// edge becomes perpendicular projection; everything else falls through to
// the cursor pick points (snap.point) which already lie on the geometry.
// =====================================================================

function closestPointOnSegment(p, a, b) {
  const ab = b.subtract(a);
  const lenSq = ab.lengthSquared();
  if (lenSq < 1e-14) return a.clone();
  let t = BABYLON.Vector3.Dot(p.subtract(a), ab) / lenSq;
  t = Math.max(0, Math.min(1, t));
  return a.add(ab.scale(t));
}

// Standard skew-line closest-segment algorithm. Handles parallel + degenerate
// cases. Returns the two world points that minimize |a - b|.
function shortestSegmentBetweenSegments(p0, p1, q0, q1) {
  const d1 = p1.subtract(p0);
  const d2 = q1.subtract(q0);
  const r  = p0.subtract(q0);
  const a = d1.lengthSquared();
  const e = d2.lengthSquared();
  const f = BABYLON.Vector3.Dot(d2, r);
  let s, t;
  if (a < 1e-14 && e < 1e-14) return { a: p0.clone(), b: q0.clone() };
  if (a < 1e-14) { s = 0; t = Math.max(0, Math.min(1, f / e)); }
  else {
    const c = BABYLON.Vector3.Dot(d1, r);
    if (e < 1e-14) { t = 0; s = Math.max(0, Math.min(1, -c / a)); }
    else {
      const b = BABYLON.Vector3.Dot(d1, d2);
      const denom = a * e - b * b;
      s = denom !== 0 ? Math.max(0, Math.min(1, (b * f - c * e) / denom)) : 0;
      t = (b * s + f) / e;
      if (t < 0)      { t = 0; s = Math.max(0, Math.min(1, -c / a)); }
      else if (t > 1) { t = 1; s = Math.max(0, Math.min(1, (b - c) / a)); }
    }
  }
  return { a: p0.add(d1.scale(s)), b: q0.add(d2.scale(t)) };
}

// Centroid of a picked entity, in scene meters. Per-user UX choice: the
// dimension line connects the **center** of each picked thing — predictable
// and appealing for users who think in "from center of this to center of
// that". Edge-edge → midpoint-to-midpoint, face-face → centroid-to-centroid,
// vertex/point → as-is, body → bbox center.
function pickCentroid(p) {
  if (p.kind === 'edge' && p.edgeA && p.edgeB) {
    return p.edgeA.add(p.edgeB).scale(0.5);
  }
  if (p.kind === 'face' && p.face && p.face.centroid) {
    return p.face.centroid.clone();   // centroid of the whole logical face
  }
  if (p.kind === 'face' && p.faceTri) {
    // Legacy single-tri fallback (shouldn't happen post-flood-fill).
    const [a, b, c] = p.faceTri;
    return a.add(b).add(c).scale(1 / 3);
  }
  return p.point.clone();
}

// The dimension line endpoints. We always go centroid-to-centroid so the
// line is straight, deterministic, and visually predictable. Auxiliary
// helpers (closestPointOnSegment, shortestSegmentBetweenSegments) are kept
// in the codebase for future "perpendicular" / "shortest" annotation modes.
function computeMeasureEndpoints(p1, p2) {
  return { a: pickCentroid(p1), b: pickCentroid(p2) };
}

// Direction vector for a pick (unit). Edges → along the edge. Faces → face
// normal (so face-face angle is the dihedral angle). Vertex/body/point →
// null (no meaningful direction).
function pickDirection(p) {
  if (p.kind === 'edge' && p.edgeA && p.edgeB) {
    const d = p.edgeB.subtract(p.edgeA);
    if (d.lengthSquared() < 1e-14) return null;
    return d.normalize();
  }
  if (p.kind === 'face' && p.face && p.face.normal) {
    return p.face.normal.clone();    // averaged normal of the whole face
  }
  if (p.kind === 'face' && p.faceTri) {
    const [a, b, c] = p.faceTri;
    const n = BABYLON.Vector3.Cross(b.subtract(a), c.subtract(a));
    if (n.lengthSquared() < 1e-14) return null;
    return n.normalize();
  }
  return null;
}

// Angle between two picks in degrees (0..180), or null if either pick has
// no direction (vertex/body/point). Edge-edge → angle between edges.
// Face-face → dihedral. Edge-face → angle between edge and face normal,
// returned as the COMPLEMENT (angle from edge to face plane = 90 - angle).
function computeMeasureAngle(p1, p2) {
  const d1 = pickDirection(p1);
  const d2 = pickDirection(p2);
  if (!d1 || !d2) return null;
  const dot = Math.abs(BABYLON.Vector3.Dot(d1, d2));
  const clamped = Math.max(-1, Math.min(1, dot));
  let deg = Math.acos(clamped) * 180 / Math.PI;
  // Edge-face: report angle FROM edge TO face plane (= 90 - angle to normal).
  const isEF = (p1.kind === 'edge' && p2.kind === 'face') ||
               (p1.kind === 'face' && p2.kind === 'edge');
  if (isEF) deg = 90 - deg;
  return deg;
}

let measureLine = null;
let measureLabel = null;

function makeDimensionLabel(mainText, subText, midpoint) {
  const ext = sceneExtentMeters();
  // 2-row pill: distance on top, kind-context + mils underneath.
  // 2026-05-06 user feedback: main was reading ~32pt on screen — way too
  // large for a UI label. Subtitle was fine. Brought main from 96px →
  // 56px (≈14pt rendered) and tightened texture height + padding so the
  // pill is proportionally smaller without wrapping.
  const texW = 1024, texH = 192;
  const dt = new BABYLON.DynamicTexture('measure-label-tex', { width: texW, height: texH }, scene, true);
  const ctx = dt.getContext();
  ctx.clearRect(0, 0, texW, texH);

  ctx.font = 'bold 56px ui-monospace, "SF Mono", Menlo, monospace';
  const mainW = ctx.measureText(mainText).width;
  ctx.font = '500 44px -apple-system, "Inter", "Segoe UI", system-ui, sans-serif';
  const subW = subText ? ctx.measureText(subText).width : 0;
  const padX = 40, padY = 24;
  const w = Math.min(Math.max(mainW, subW) + padX * 2, texW - 4);
  const h = texH - padY * 0.5;
  const x0 = (texW - w) / 2, y0 = (texH - h) / 2;
  // Pill background — translucent dark so it never blends into a dark chip body
  ctx.fillStyle = 'rgba(18, 22, 28, 0.92)';
  ctx.beginPath();
  const r = 22;
  ctx.moveTo(x0 + r, y0);
  ctx.arcTo(x0 + w, y0, x0 + w, y0 + h, r);
  ctx.arcTo(x0 + w, y0 + h, x0, y0 + h, r);
  ctx.arcTo(x0, y0 + h, x0, y0, r);
  ctx.arcTo(x0, y0, x0 + w, y0, r);
  ctx.closePath();
  ctx.fill();
  ctx.lineWidth = 3;
  ctx.strokeStyle = '#64abff';
  ctx.stroke();
  // Distance — bold white, smaller than v1.0 to read as UI text not headline
  ctx.font = 'bold 56px ui-monospace, "SF Mono", Menlo, monospace';
  ctx.fillStyle = '#ffffff';
  ctx.textAlign = 'center';
  ctx.textBaseline = 'middle';
  ctx.fillText(mainText, texW / 2, subText ? texH / 2 - 22 : texH / 2);
  // Sub text — kind context like "Edge ↔ Edge" in brand blue-light
  if (subText) {
    ctx.font = '500 44px -apple-system, "Inter", "Segoe UI", system-ui, sans-serif';
    ctx.fillStyle = '#64abff';
    ctx.fillText(subText, texW / 2, texH / 2 + 36);
  }
  dt.update();

  const planeWidth = ext * 0.26;
  const planeHeight = planeWidth * (texH / texW);
  const plane = BABYLON.MeshBuilder.CreatePlane('measure-label', {
    width: planeWidth, height: planeHeight, sideOrientation: BABYLON.Mesh.DOUBLESIDE,
  }, scene);
  // Lift the label slightly above the dimension line midpoint so it's not
  // covered by chip body / pin geometry. Offset is a small fraction of
  // scene extent and always toward the camera-up direction.
  const upOffset = ext * 0.04;
  plane.position = midpoint.add(new BABYLON.Vector3(0, 0, upOffset));
  plane.billboardMode = BABYLON.Mesh.BILLBOARDMODE_ALL;
  const mat = new BABYLON.StandardMaterial('measure-label-mat', scene);
  mat.diffuseTexture = dt;
  mat.diffuseTexture.hasAlpha = true;
  mat.useAlphaFromDiffuseTexture = true;
  mat.emissiveColor = new BABYLON.Color3(1, 1, 1);
  mat.disableLighting = true;
  mat.backFaceCulling = false;
  // Label MUST render on top of all geometry so the user can read the
  // measurement even when the line midpoint is inside / behind the part.
  // depthFunction = ALWAYS makes the depth test always pass, and a higher
  // renderingGroupId puts it after the main scene draw.
  mat.disableDepthWrite = true;
  mat.depthFunction = BABYLON.Engine.ALWAYS;
  plane.material = mat;
  plane.renderingGroupId = 3;
  plane.alwaysSelectAsActiveMesh = true;
  plane.isPickable = false;
  return plane;
}

function drawMeasureLine() {
  if (measureLine) { measureLine.dispose(); measureLine = null; }
  if (measureLabel) { measureLabel.dispose(); measureLabel = null; }
  const ep = computeMeasureEndpoints(measurePicks[0], measurePicks[1]);
  const distance_m = BABYLON.Vector3.Distance(ep.a, ep.b);
  const ext = sceneExtentMeters();
  // Dimension line: brand blue-light (#64ABFF) so it reads as "measurement"
  // rather than "selection" (which is teal). Slightly thinner than
  // committed-edge tubes to keep the visual hierarchy clean.
  measureLine = BABYLON.MeshBuilder.CreateTube('measure-line', {
    path: [ep.a, ep.b], radius: ext * 0.0035, updatable: false,
  }, scene);
  const mat = new BABYLON.StandardMaterial('measure-line-mat', scene);
  mat.disableLighting = true;
  mat.emissiveColor = BABYLON.Color3.FromHexString('#64abff');
  measureLine.material = mat;
  measureLine.renderingGroupId = 3;
  measureLine.isPickable = false;

  // 3D billboard label at midpoint with kind-context + angle subtitle.
  const mid = ep.a.add(ep.b).scale(0.5);
  const distance_mm = distance_m * M_TO_MM;
  const mils = distance_mm / 0.0254;
  const mainText = (Math.round(distance_mm * 1000) / 1000).toFixed(3) + ' mm';
  const milsText = (Math.round(mils * 10) / 10).toFixed(1) + ' mils';
  const k = (s) => s.charAt(0).toUpperCase() + s.slice(1);
  const angle = computeMeasureAngle(measurePicks[0], measurePicks[1]);
  const angleText = angle != null ? (Math.round(angle * 10) / 10).toFixed(1) + '°' : null;
  // Subtitle order: angle (if any) · kind ↔ kind · mils
  const parts = [];
  if (angleText) parts.push(angleText);
  parts.push(k(measurePicks[0].kind) + ' ↔ ' + k(measurePicks[1].kind));
  parts.push(milsText);
  const subText = parts.join('  ·  ');
  measureLabel = makeDimensionLabel(mainText, subText, mid);

  return { endpointA: ep.a, endpointB: ep.b, distance_mm };
}

function renderMeasureHud() {
  const body = document.getElementById('measureBody');
  if (!measurePicks.length) {
    body.innerHTML = '<div class="mh-hint">Click two points on the model.</div>';
    return;
  }
  let html = '';
  for (let i = 0; i < measurePicks.length; i++) {
    const p = measurePicks[i];
    html += '<div class="mh-row"><span class="lbl">Sel ' + (i + 1) + '</span><span class="val">' + p.kind + ' on ' + (p.mesh && p.mesh.name ? p.mesh.name : '?') + '</span></div>';
    html += '<div class="mh-row"><span class="lbl">Position</span><span class="val">' + fmt(p.point.x) + ', ' + fmt(p.point.y) + ', ' + fmt(p.point.z) + '</span></div>';
  }
  if (measurePicks.length === 2) {
    // Use the same dimension endpoints as the 3D line, so HUD numbers
    // match the visible measurement. Edge-edge gives the SHORTEST
    // distance; vertex-edge gives perpendicular; etc.
    const ep = computeMeasureEndpoints(measurePicks[0], measurePicks[1]);
    const dx = Math.abs(ep.b.x - ep.a.x);
    const dy = Math.abs(ep.b.y - ep.a.y);
    const dz = Math.abs(ep.b.z - ep.a.z);
    const d  = Math.sqrt(dx * dx + dy * dy + dz * dz);
    html += '<div class="mh-sep"></div>';
    html += '<div class="mh-row"><span class="lbl">ΔX</span><span class="val">' + dualUnits(dx) + '</span></div>';
    html += '<div class="mh-row"><span class="lbl">ΔY</span><span class="val">' + dualUnits(dy) + '</span></div>';
    html += '<div class="mh-row"><span class="lbl">ΔZ</span><span class="val">' + dualUnits(dz) + '</span></div>';
    html += '<div class="mh-sep"></div>';
    html += '<div class="mh-row"><span class="lbl">Distance</span><span class="val mh-distance">' + dualUnits(d) + '</span></div>';
    const ang = computeMeasureAngle(measurePicks[0], measurePicks[1]);
    if (ang != null) {
      html += '<div class="mh-row"><span class="lbl">Angle</span><span class="val">' + (Math.round(ang * 100) / 100).toFixed(2) + '°</span></div>';
    }
  }
  body.innerHTML = html;
}

// Babylon scene works in meters (glTF / OCCT convention). All UI labels
// are in mm + mils — convert at the display boundary, never propagate
// meters into measure/inspect output.
const M_TO_MM = 1000;
function fmt(meters) { return (Math.round(meters * M_TO_MM * 1000) / 1000).toFixed(3); }
function dualUnits(meters) {
  const mm = meters * M_TO_MM;
  const mils = mm / 0.0254;
  return '<span>' + (Math.round(mm * 1000) / 1000).toFixed(3) + ' mm</span> <span class="mh-secondary">/ ' + (Math.round(mils * 10) / 10).toFixed(1) + ' mils</span>';
}

// =====================================================================
// 11. Inspect tool — hover the model, show an amber card with details.
// =====================================================================

let inspectActive = true;     // hover-inspect is always on by default
let inspectPinned = false;
let lastHoverEntry = null;

// Find the SECOND-LEVEL (depth-1) ancestor of an entry. Used by hover-
// highlight so we light up the meaningful sub-part the cursor is over,
// not the entire chip (which would be too coarse) and not the random
// material/triangle leaf the picker landed on (which would be too fine).
// Per user feedback May 2026: top-level highlight feels like the whole
// thing lights up; second-level matches what they want to inspect (Body
// vs Pin 17 vs Contacts vs MODULE_NAUO2 etc.).
function secondLevelOf(entry) {
  if (!entry) return null;
  if (entry.depth <= 1) return entry;
  let cur = entry;
  while (cur && cur.depth > 1) {
    cur = cur.parentId == null ? null : nodeById.get(cur.parentId);
  }
  return cur || entry;
}

let lastHoverTopLevel = null;

function setHoverHighlight(entry) {
  // Clear previous overlay
  if (lastHoverTopLevel && lastHoverTopLevel !== entry) {
    for (const m of lastHoverTopLevel.allMeshes) {
      if (m && m.renderOverlay) m.renderOverlay = false;
    }
  }
  lastHoverTopLevel = entry;
  if (!entry) return;
  // mesh.renderOverlay + overlayColor/overlayAlpha gives a gentle tint
  // that you can still see geometry through. Brand blue-light at α 0.3
  // — visibly highlights the part without obliterating it like
  // HighlightLayer does.
  for (const m of entry.allMeshes) {
    if (!m) continue;
    m.overlayColor = BABYLON.Color3.FromHexString('#64abff');
    m.overlayAlpha = 0.3;
    m.renderOverlay = true;
  }
}

function findInOutline(entry) {
  if (!entry) return false;
  // Expand every ancestor so the row is visible.
  let cur = entry;
  while (cur) {
    cur.expanded = true;
    cur = cur.parentId == null ? null : nodeById.get(cur.parentId);
  }
  renderTree();
  // Scroll the row into view + flash it.
  const row = document.querySelector('.tree-row[data-id="' + entry.id + '"]');
  if (!row) return false;
  row.scrollIntoView({ block: 'center', behavior: 'smooth' });
  row.classList.remove('flash');
  // Force reflow so the animation restarts even if the same row is re-found.
  void row.offsetWidth;
  row.classList.add('flash');
  setTimeout(() => row.classList.remove('flash'), 1400);
  return true;
}

function setupInspectTool() {
  // POINTERMOVE: gentle hover-highlight of the top-level object the cursor
  // is over. NO popup card (intrusive, gets in the way). User can still
  // open the inspect card explicitly via right-click → Properties.
  scene.onPointerObservable.add((pi) => {
    if (!inspectActive || measureActive) return;
    if (pi.type !== BABYLON.PointerEventTypes.POINTERMOVE) return;
    if (inspectPinned) return;
    const pick = scene.pick(scene.pointerX, scene.pointerY, isPickableMesh);
    if (!pick || !pick.hit) {
      setHoverHighlight(null);
      return;
    }
    const entry = entryForMesh(pick.pickedMesh);
    if (!entry) { setHoverHighlight(null); return; }
    // Highlight the DEEPEST matching entry (per user feedback May 2026):
    // hovering a pin in 3D should light up just that pin, not the whole
    // Pins group. entryForMesh already returns the deepest match.
    if (entry !== lastHoverTopLevel) setHoverHighlight(entry);
  });
  // Left-click: post selection to server (CLI inspect support).
  scene.onPointerObservable.add((pi) => {
    if (!inspectActive || measureActive) return;
    if (pi.type !== BABYLON.PointerEventTypes.POINTERTAP) return;
    if (pi.event.button !== 0) return;
    const pick = scene.pick(scene.pointerX, scene.pointerY, isPickableMesh);
    if (pick && pick.hit) {
      const entry = entryForMesh(pick.pickedMesh);
      if (entry) {
        fetch('api/selection', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ id: entry.id, name: entry.name, depth: entry.depth }),
        }).catch(() => {});
      }
    }
  });

  // Right-click on the 3D canvas: open the same context menu the sidebar
  // rows use (Reveal in Outline / Isolate / Hide Others / Show / Hide /
  // Zoom To / Copy Name / Properties). Mirrors Fusion 360 — right-click
  // on a body in the canvas gives the same actions as right-click on its
  // browser row. All visibility actions are Ctrl+Z-undoable; "Hide" also
  // flashes the row in the sidebar so the user can find their way back.
  const renderContainer = document.getElementById('renderContainer');
  if (renderContainer) {
    renderContainer.addEventListener('contextmenu', (e) => {
      e.preventDefault();   // suppress browser menu
      const pick = scene.pick(scene.pointerX, scene.pointerY, isPickableMesh);
      if (!pick || !pick.hit) {
        showToast('Nothing under the cursor', 'err');
        return;
      }
      const entry = entryForMesh(pick.pickedMesh);
      if (!entry) {
        showToast('Picked mesh has no outline entry', 'err');
        return;
      }
      openContextMenu(e.clientX, e.clientY, entry);
    });
  }
}

function entryForMesh(mesh) {
  // Find the MOST SPECIFIC (deepest) entry whose mesh-set contains this
  // mesh. The previous version returned whichever entry came first in
  // nodeById insertion order — that was always the depth-0 root, so
  // `secondLevelOf` had nothing to walk up to. Now we prefer the deepest
  // match so secondLevelOf can correctly demote to depth-1.
  let best = null;
  for (const e of nodeById.values()) {
    if (!e.allMeshes && !e.directMeshes) continue;
    const has = (e.allMeshes && e.allMeshes.includes(mesh)) ||
                (e.directMeshes && e.directMeshes.includes(mesh));
    if (has && (!best || e.depth > best.depth)) best = e;
  }
  return best;
}

function hideInspectCard() {
  if (inspectPinned) return;
  document.getElementById('inspectCard').classList.remove('open');
}

function showInspectCard(entry, x, y, hoveredMesh) {
  const card = document.getElementById('inspectCard');
  card.classList.add('open');
  document.getElementById('icName').textContent = entry.name;
  document.getElementById('icPath').textContent = pathOf(entry);
  document.getElementById('icBody').innerHTML = inspectBodyHtml(entry, hoveredMesh);
  moveInspectCard(x, y);
}

function pinInspectCard(entry) {
  inspectPinned = true;
  const card = document.getElementById('inspectCard');
  card.classList.add('open', 'pinned');
  document.getElementById('icName').textContent = entry.name;
  document.getElementById('icPath').textContent = pathOf(entry);
  document.getElementById('icBody').innerHTML = inspectBodyHtml(entry, null);
  // Default position: top-right of canvas, just below the section/measure HUD
  // line. Avoid leaving the card wherever the last hover put it (which can
  // be off-screen if pin was triggered from CLI without a mouse position).
  const r = document.getElementById('renderContainer').getBoundingClientRect();
  card.style.left = Math.round(r.right - 280) + 'px';
  card.style.top = Math.round(r.top + 12) + 'px';
}

function unpinInspectCard() {
  inspectPinned = false;
  document.getElementById('inspectCard').classList.remove('pinned', 'open');
}

function moveInspectCard(x, y) {
  const card = document.getElementById('inspectCard');
  const offsetX = 16, offsetY = 16;
  let left = x + offsetX, top = y + offsetY;
  const w = card.offsetWidth, h = card.offsetHeight;
  const W = window.innerWidth, H = window.innerHeight;
  if (left + w > W - 8) left = x - w - offsetX;
  if (top + h > H - 8) top = y - h - offsetY;
  card.style.left = left + 'px';
  card.style.top = top + 'px';
}

function pathOf(entry) {
  const parts = [];
  let cur = entry;
  while (cur) {
    parts.unshift(cur.name);
    cur = cur.parentId == null ? null : nodeById.get(cur.parentId);
  }
  return parts.join(' › ');
}

function inspectBodyHtml(entry, hoveredMesh) {
  const bb = combinedBoundingBox(entry.allMeshes);
  let html = '';
  if (bb) {
    const w = bb.max.x - bb.min.x, d = bb.max.y - bb.min.y, h = bb.max.z - bb.min.z;
    html += '<span class="lbl">Size</span><span class="val">' + dualUnits(w) + ' × ' + fmt(d) + ' × ' + fmt(h) + ' mm</span>';
  }
  let mesh = hoveredMesh;
  if (!mesh && entry.allMeshes.length) mesh = entry.allMeshes[0];
  if (mesh && mesh.material) {
    const matName = mesh.material.name || '?';
    const found = materialsCache.find(m => m.name === matName);
    let swatch = '';
    if (found && found.baseColor && found.baseColor.length >= 3) {
      const [r, g, b] = found.baseColor;
      const css = 'rgb(' + Math.round(r * 255) + ',' + Math.round(g * 255) + ',' + Math.round(b * 255) + ')';
      swatch = '<span class="swatch" style="background:' + css + '"></span>';
    } else if (mesh.material.albedoColor) {
      const c = mesh.material.albedoColor;
      const css = 'rgb(' + Math.round(c.r * 255) + ',' + Math.round(c.g * 255) + ',' + Math.round(c.b * 255) + ')';
      swatch = '<span class="swatch" style="background:' + css + '"></span>';
    } else if (mesh.material.diffuseColor) {
      const c = mesh.material.diffuseColor;
      const css = 'rgb(' + Math.round(c.r * 255) + ',' + Math.round(c.g * 255) + ',' + Math.round(c.b * 255) + ')';
      swatch = '<span class="swatch" style="background:' + css + '"></span>';
    }
    html += '<span class="lbl">Material</span><span class="val">' + swatch + matName + '</span>';
  }
  let totalVerts = 0, totalFaces = 0;
  for (const m of entry.allMeshes) {
    if (m.getTotalVertices) totalVerts += m.getTotalVertices() || 0;
    if (m.getIndices) {
      const idx = m.getIndices();
      if (idx) totalFaces += idx.length / 3;
    }
  }
  html += '<span class="lbl">Geometry</span><span class="val">' + Math.round(totalVerts) + ' verts · ' + Math.round(totalFaces) + ' faces</span>';
  html += '<span class="lbl">Children</span><span class="val">' + entry.children.length + '</span>';
  return html;
}

// Section feature removed (May 2026) — see comment in HTML for context.

// =====================================================================
// 13. Keyboard
// =====================================================================

function popLastMeasurePick() {
  if (!measurePicks.length) return false;
  const last = measurePicks.pop();
  if (last.markers) for (const m of last.markers) m.dispose();
  else if (last.marker) last.marker.dispose();
  if (measureLine) { measureLine.dispose(); measureLine = null; }
  if (measureLabel) { measureLabel.dispose(); measureLabel = null; }
  clearMeasurePreview();
  renderMeasureHud();
  return true;
}

function setupKeyboard() {
  window.addEventListener('keydown', (e) => {
    const inField = e.target && (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA');
    if (inField) return;
    if (e.key === 'Escape') {
      // Inspect-pinned: unpin first.
      if (inspectPinned) { unpinInspectCard(); return; }
      // Measure: progressive backout — pop the most recent pick first, then
      // the earlier one, then close the HUD on the third Esc. Matches the
      // adom-tsci behavior the user expects.
      if (measureActive) {
        if (measurePicks.length > 0) { popLastMeasurePick(); return; }
        toggleMeasure();
        return;
      }
      // (Section tool removed.)
    }
    if (e.key === 'm' || e.key === 'M') { toggleMeasure(); }
    // 'S' shortcut retired with the Section tool.
    if (e.key === 'h' || e.key === 'H') { viewer.goHome(); }
    if ((e.ctrlKey || e.metaKey) && e.key === 'z') { e.preventDefault(); undoVisibility(); }
    if ((e.ctrlKey || e.metaKey) && (e.key === 'y' || (e.shiftKey && e.key === 'Z'))) { e.preventDefault(); redoVisibility(); }
  });
}

// =====================================================================
// 14. Eval pipeline + window.adomStep API
// =====================================================================

window.adomStep = {
  listComponents() {
    return assemblyTree.map(e => ({
      id: e.id, name: e.name, depth: e.depth, parentId: e.parentId,
      visible: e.visible, childCount: e.children.length, meshCount: e.allMeshes.length,
    }));
  },
  isolate(name, opts) {
    // CLI / AI default re-frames on the isolated subtree — without it, an
    // AI screenshot after isolate often shows the model off-camera. Pass
    // { frame: false } to opt out (sidebar icon does this).
    const e = findEntry(name);
    if (!e) return { error: 'no node named ' + name };
    const o = Object.assign({ frame: true }, opts || {});
    pushVisibilityHistory(() => isolateEntry(e, o));
    return { ok: true, name: e.name };
  },
  show(name) {
    const e = findEntry(name);
    if (!e) return { error: 'no node named ' + name };
    pushVisibilityHistory(() => setSubtreeVisibility(e, true));
    return { ok: true };
  },
  hide(name) {
    const e = findEntry(name);
    if (!e) return { error: 'no node named ' + name };
    pushVisibilityHistory(() => setSubtreeVisibility(e, false));
    return { ok: true };
  },
  showAll() { pushVisibilityHistory(() => showAllEntries()); return { ok: true }; },
  frame(name) {
    if (!name) { viewer.goHome(); return { ok: true }; }
    const e = findEntry(name);
    if (!e) return { error: 'no node named ' + name };
    frameOnEntry(e);
    return { ok: true };
  },
  /**
   * Bounding box of a named entry (or the whole model if `name` is omitted).
   * Returns world-space coords + size in scene units AND in mm. Service
   * step2glb authors GLBs in metres (1 unit = 1 m), so the mm conversion
   * is just ×1000. Call without args to get the full-model bbox; pass
   * a node name like "Body" or "VL53L8 MODULE ASSEMBLY" to scope.
   *
   * Used by chipsmith Tab 2 (Measurements) to compare detected body
   * dims against the manifest's declared body_dims_mm.
   */
  /**
   * Direct Babylon scene access. Returns the active Scene reference
   * so consumers (chipsmith) can author overlay meshes via
   * BABYLON.MeshBuilder. Pair with addOverlay / removeOverlay /
   * setOverlayVisible for tracked groups so cleanup on chip-reload
   * is automatic.
   */
  getScene() {
    return viewer.getScene();
  },
  /**
   * Babylon namespace shortcut for consumers that don't want to walk
   * window.Adom3DViewerBabylon9.BABYLON every time.
   */
  getBabylon() {
    return window.Adom3DViewerBabylon9 && window.Adom3DViewerBabylon9.BABYLON;
  },
  // Overlay-group registry: chipsmith adds tagged mesh groups (footprint
  // pads, faux PCB, heatsink vias, solder-jet domes) and toggles them
  // visible/hidden as a unit. The viewer holds the registry so
  // chip-reload (clearScene) can dispose every group automatically.
  //
  // Per gallia/skills/3d-viewer-design §14 — every overlay group is
  // ALSO a first-class Outline entry: it gets a synthetic assemblyTree
  // row (id range < -10000 so it never collides with GLB-derived
  // negative ids like the material-cluster groups), eye toggle,
  // click-to-isolate, search-filter visibility — same affordances as a
  // regular GLB node.
  _overlayGroups: {},
  _overlayNextId: -10001,
  /**
   * Author an overlay layer with optional per-feature child rows.
   *
   *   addOverlay({
   *     group:   'fp-kicad',
   *     label:   'KiCad footprint (18 pads)',
   *     kind:    'overlay-footprint',
   *     parent:  'overlays-root',                  // optional outline parent
   *     children: [                                 // optional per-feature rows
   *       { meshes: [pad1Mesh], label: 'fp pad 1 (A1)  rect 0.30×0.45  c=(1.95,2.45)', kind: 'overlay-pad' },
   *       { meshes: [pad2Mesh], label: 'fp pad 2  rect 0.30×0.45  c=(1.45,2.45)', kind: 'overlay-pad' },
   *       ...
   *     ],
   *     // Or the legacy single-bag shape:
   *     meshes: [...],                              // bag of meshes attached to the parent row
   *   });
   *
   * When `children` is present, each child becomes its own outline row
   * with its own meshes, eye toggle, click-to-isolate, etc. The parent
   * row's eye toggles ALL children at once (group toggle per
   * gallia/skills/3d-viewer-design §14).
   *
   * Legacy 2-arg form addOverlay(group, meshes) still works.
   */
  addOverlay(groupOrOpts, maybeMeshes) {
    let group, meshes, label, parent, kind, children, tooltip;
    if (typeof groupOrOpts === 'string') {
      group = groupOrOpts;
      meshes = Array.isArray(maybeMeshes) ? maybeMeshes : [maybeMeshes];
      label = group;
      kind = 'overlay';
      children = null;
      tooltip = null;
    } else {
      ({ group, meshes, label, parent, kind, children, tooltip } = groupOrOpts);
      if (meshes && !Array.isArray(meshes)) meshes = [meshes];
      label = label || group;
      kind = kind || 'overlay';
    }
    const rec = this._overlayGroups[group] || { meshes: [], entryId: null, childIds: [] };
    if (!this._overlayGroups[group]) this._overlayGroups[group] = rec;

    // Compute the union mesh list for the parent row's allMeshes
    // (eye toggle on parent walks this).
    const allUnion = [];
    if (Array.isArray(meshes)) allUnion.push(...meshes);
    if (Array.isArray(children)) {
      for (const c of children) {
        if (Array.isArray(c.meshes)) allUnion.push(...c.meshes);
      }
    }
    rec.meshes.push(...allUnion);

    // First call for this group: create the parent outline entry.
    if (rec.entryId === null && groupOrOpts && typeof groupOrOpts !== 'string') {
      const id = this._overlayNextId--;
      let parentId = null;
      let depth = 0;
      if (parent) {
        const pe = findEntry(parent);
        if (pe) { parentId = pe.id; depth = pe.depth + 1; }
      }
      const parentEntry = {
        id, name: label, depth, parentId,
        visible: true, expanded: false,
        children: [],
        meshes: meshes ? meshes.slice() : [],
        allMeshes: allUnion.slice(),
        kind,
        isOverlay: true,
        overlayGroup: group,
        overlayTooltip: tooltip || null,
      };
      assemblyTree.push(parentEntry);
      nodeById.set(id, parentEntry);     // ← REQUIRED for collapse-chain traversal
      rec.entryId = id;

      // Per-child rows.
      if (Array.isArray(children) && children.length) {
        for (const c of children) {
          const cid = this._overlayNextId--;
          const childMeshes = Array.isArray(c.meshes) ? c.meshes : (c.meshes ? [c.meshes] : []);
          const childEntry = {
            id: cid,
            name: c.label || (label + ' child'),
            depth: depth + 1,
            parentId: id,
            visible: true, expanded: false,
            children: [],
            meshes: childMeshes,
            allMeshes: childMeshes.slice(),
            kind: c.kind || (kind + '-child'),
            isOverlay: true,
            overlayGroup: group,
            overlayChildIndex: rec.childIds.length,
          };
          assemblyTree.push(childEntry);
          nodeById.set(cid, childEntry); // ← REQUIRED for collapse-chain traversal
          rec.childIds.push(cid);
          parentEntry.children.push(childEntry);
        }
      }
      if (typeof renderTree === 'function') renderTree();
    }
    return { ok: true, group, count: rec.meshes.length, entryId: rec.entryId, childCount: rec.childIds.length };
  },
  removeOverlay(group) {
    const rec = this._overlayGroups[group];
    if (!rec) return { ok: false, error: 'no group named ' + group };
    for (const m of rec.meshes) {
      try { m.dispose(); } catch (_) {}
    }
    // Remove parent + every child entry from assemblyTree AND nodeById.
    const removeIds = new Set([rec.entryId, ...(rec.childIds || [])].filter(x => x !== null && x !== undefined));
    if (removeIds.size) {
      for (let i = assemblyTree.length - 1; i >= 0; i--) {
        if (removeIds.has(assemblyTree[i].id)) assemblyTree.splice(i, 1);
      }
      for (const id of removeIds) nodeById.delete(id);
      if (typeof renderTree === 'function') renderTree();
    }
    delete this._overlayGroups[group];
    return { ok: true };
  },
  setOverlayVisible(group, visible) {
    const rec = this._overlayGroups[group];
    if (!rec) return { ok: false, error: 'no group named ' + group };
    for (const m of rec.meshes) m.setEnabled(!!visible);
    // Sync parent + child outline entries' visible state.
    if (rec.entryId !== null) {
      const e = assemblyTree.find(x => x.id === rec.entryId);
      if (e) e.visible = !!visible;
    }
    if (Array.isArray(rec.childIds)) {
      for (const cid of rec.childIds) {
        const e = assemblyTree.find(x => x.id === cid);
        if (e) e.visible = !!visible;
      }
    }
    if (typeof renderTree === 'function') renderTree();
    return { ok: true, count: rec.meshes.length };
  },
  bbox(name) {
    let meshes;
    let matchedNames = [];
    if (!name) {
      meshes = viewer.getScene().meshes.filter(m =>
        m.getTotalVertices && m.getTotalVertices() > 0 &&
        !['skyBox','shadowGround','ground','laserEtch','ViewerRoot','axisHelperWorld','axisHelperLocal'].includes(m.name) &&
        !(m.name || '').startsWith('viewCube') &&
        !(m.name || '').startsWith('__'));
    } else {
      // Union across EVERY entry whose name === query (case-insensitive).
      // VL53L8CX-style assemblies have multiple "Body" entries (one per
      // NAUO sub-product); chipsmith Tab 2 wants their union, not just
      // the first match.
      const lc = name.toLowerCase();
      const entries = assemblyTree.filter(e => (e.name || '').toLowerCase() === lc);
      if (entries.length === 0) return { error: 'no node named ' + name };
      meshes = [];
      for (const e of entries) meshes.push(...e.allMeshes);
      matchedNames = entries.map(e => e.id);
    }
    const b = combinedBoundingBox(meshes);
    if (!b) return { error: 'no meshes' };
    const sx = b.max.x - b.min.x, sy = b.max.y - b.min.y, sz = b.max.z - b.min.z;
    const SCENE_TO_MM = 1000;
    return {
      ok: true,
      name: name || '__model__',
      matchCount: matchedNames.length,
      min:  [b.min.x, b.min.y, b.min.z],
      max:  [b.max.x, b.max.y, b.max.z],
      size: [sx, sy, sz],
      mm:   [sx * SCENE_TO_MM, sy * SCENE_TO_MM, sz * SCENE_TO_MM],
      sceneToMm: SCENE_TO_MM,
    };
  },
  measure(nameA, nameB) {
    const a = findEntry(nameA), b = findEntry(nameB);
    if (!a || !b) return { error: 'no node(s) named ' + nameA + ' / ' + nameB };
    const ba = combinedBoundingBox(a.allMeshes), bb = combinedBoundingBox(b.allMeshes);
    if (!ba || !bb) return { error: 'no geometry on one of the nodes' };
    if (!measureActive) toggleMeasure();
    clearMeasure();
    measurePicks.push({
      point: ba.center.clone(), mesh: a.allMeshes[0], kind: 'body',
      markers: makeMeasureMarker({ kind: 'body', point: ba.center.clone(), mesh: a.allMeshes[0] }, 1),
    });
    measurePicks.push({
      point: bb.center.clone(), mesh: b.allMeshes[0], kind: 'body',
      markers: makeMeasureMarker({ kind: 'body', point: bb.center.clone(), mesh: b.allMeshes[0] }, 2),
    });
    drawMeasureLine();
    renderMeasureHud();
    const dx = Math.abs(bb.center.x - ba.center.x) * M_TO_MM;
    const dy = Math.abs(bb.center.y - ba.center.y) * M_TO_MM;
    const dz = Math.abs(bb.center.z - ba.center.z) * M_TO_MM;
    const d = Math.sqrt(dx * dx + dy * dy + dz * dz);
    return { ok: true, from: a.name, to: b.name, distance_mm: d, dx, dy, dz };
  },
  inspect(name) {
    const e = findEntry(name);
    if (!e) return { error: 'no node named ' + name };
    pinInspectCard(e);
    const bb = combinedBoundingBox(e.allMeshes);
    return {
      name: e.name, depth: e.depth, path: pathOf(e),
      visible: e.visible, childCount: e.children.length, meshCount: e.allMeshes.length,
      size_mm: bb ? { x: (bb.max.x - bb.min.x) * M_TO_MM, y: (bb.max.y - bb.min.y) * M_TO_MM, z: (bb.max.z - bb.min.z) * M_TO_MM } : null,
    };
  },
  async screenshot(opts) {
    const eng = viewer.getEngine();
    const cam = viewer.getCamera();
    const w = (opts && opts.width) || 1600;
    const h = (opts && opts.height) || 1000;
    return new Promise((resolve, reject) => {
      try {
        BABYLON.Tools.CreateScreenshotUsingRenderTarget(eng, cam, { width: w, height: h }, (data) => resolve(data), 'image/png', 4, true);
      } catch (e) { reject(e); }
    });
  },
  setView(name, opts) { setView(name, opts || { frameWhole: true }); return { ok: true, view: name }; },
  saveView(name) {
    const cam = scene.activeCamera;
    if (!cam) return { error: 'no camera' };
    const v = { alpha: cam.alpha, beta: cam.beta, radius: cam.radius, target: { x: cam.target.x, y: cam.target.y, z: cam.target.z } };
    const all = JSON.parse(localStorage.getItem('adom-step:views') || '{}');
    all[name] = v;
    localStorage.setItem('adom-step:views', JSON.stringify(all));
    return { ok: true };
  },
  recallView(name) {
    const all = JSON.parse(localStorage.getItem('adom-step:views') || '{}');
    const v = all[name];
    if (!v) return { error: 'no saved view ' + name };
    const cam = scene.activeCamera;
    cam.alpha = v.alpha; cam.beta = v.beta; cam.radius = v.radius;
    cam.target = new BABYLON.Vector3(v.target.x, v.target.y, v.target.z);
    return { ok: true };
  },
  listViews() {
    return JSON.parse(localStorage.getItem('adom-step:views') || '{}');
  },
  // Section JS API removed (May 2026) along with the feature.

  // Pin clustering — detected from material grouping + spatial clustering.
  // Centroids are in scene units (meters); multiply by 1000 for mm.
  pinCount() { return pinClusters.length; },
  pins() {
    return pinClusters.map(c => ({
      id: c.id, side: c.side,
      centroid_mm: { x: c.centroid.x * M_TO_MM, y: c.centroid.y * M_TO_MM, z: c.centroid.z * M_TO_MM },
      meshCount: c.meshes.length,
    }));
  },
  isolatePin(id) {
    const cluster = pinClusters.find(c => c.id === id);
    if (!cluster) return { error: 'no pin ' + id + ' (have ' + pinClusters.length + ')' };
    // Use the unified isolateEntry path so the JS API matches the sidebar
    // diamond exactly (hides everything except the cluster's subtree).
    const entry = assemblyTree.find(e => e.isPinEntry && e.pinId === id);
    if (!entry) return { error: 'no entry for pin ' + id };
    pushVisibilityHistory(() => isolateEntry(entry, { frame: false }));
    return { ok: true, id, side: cluster.side, centroid_mm: { x: cluster.centroid.x * M_TO_MM, y: cluster.centroid.y * M_TO_MM, z: cluster.centroid.z * M_TO_MM } };
  },
  showAllPins() {
    pushVisibilityHistory(() => {
      for (const c of pinClusters) for (const m of c.meshes) m.isVisible = true;
    });
    return { ok: true };
  },
  // strobePins / stopStrobe removed — strobe is out of scope for a
  // STEP viewer (chip-fetcher / chiplinter own per-pin verification).

  // =================================================================
  // DEMO HELPERS — drive visible animations for screen recordings.
  //
  // Pup CDP screencast is paint-throttled by Chrome unless the canvas
  // is actively repainting. Babylon's rAF render loop CAN throttle
  // when the tab loses foreground or is otherwise idle. The demo pump
  // bypasses rAF by calling scene.render() on a setInterval at 30 Hz —
  // forces the canvas to repaint regardless of compositor state, so
  // CDP captures real frames during a recording.
  // =================================================================
  demoPumpStart(opts) {
    if (window.__demoPumpHandle) {
      try { clearInterval(window.__demoPumpHandle); } catch (_) {}
      window.__demoPumpHandle = null;
    }
    const eng = viewer.getEngine();
    const cam = scene.activeCamera;
    try {
      if (cam.inputs && cam.inputs.attached) {
        for (const t of Object.keys(cam.inputs.attached)) cam.inputs.removeByType(t);
      }
    } catch (_) {}
    // Continuous orbit + render at 30Hz. UI events (hover/ctxmenu/isolate)
    // stack on top — they don't replace the orbit. The orbit rate is
    // configurable; default 30°/sec.
    const orbitRatePerTick = ((opts && opts.orbitDegPerSec) != null ? opts.orbitDegPerSec : 30) * (Math.PI / 180) / 30;
    window.__demoPumpHandle = setInterval(() => {
      try {
        if (window.__demoOrbitOn) cam.alpha += orbitRatePerTick;
        eng.beginFrame(); scene.render(); eng.endFrame();
      } catch (_) {}
    }, 33);
    window.__demoOrbitOn = true;
    // Plus a visible CSS animation in the corner — keeps the document
    // compositor busy even if the canvas would otherwise idle.
    let dot = document.getElementById('__demo_pump_dot__');
    if (!dot) {
      dot = document.createElement('div');
      dot.id = '__demo_pump_dot__';
      dot.style.cssText = 'position:fixed;right:8px;bottom:8px;width:6px;height:6px;border-radius:50%;background:#00b8b1;z-index:99998;animation:__demo_pump_pulse__ 0.8s infinite ease-in-out;opacity:0.4;pointer-events:none;';
      const css = document.createElement('style');
      css.textContent = '@keyframes __demo_pump_pulse__ { 0%,100%{transform:scale(1);opacity:0.3} 50%{transform:scale(1.6);opacity:0.7} }';
      document.head.appendChild(css);
      document.body.appendChild(dot);
    }
    return { ok: true };
  },
  demoPumpStop() {
    if (window.__demoPumpHandle) { clearInterval(window.__demoPumpHandle); window.__demoPumpHandle = null; }
    const dot = document.getElementById('__demo_pump_dot__');
    if (dot) dot.remove();
    return { ok: true };
  },

  // Smooth camera orbit — drives alpha via setInterval(33ms) AND forces
  // scene.render() each tick. ArcRotateCamera's input handlers (keyboard,
  // mousewheel, pointers) recompute alpha from stored input state EVERY
  // render frame, overriding direct alpha writes. We must remove the
  // inputs entirely (cam.inputs.removeByType / clear), not merely
  // detachControl, because attachControl/detachControl just toggles
  // event listeners — the input objects still mutate camera state.
  async demoOrbit(opts) {
    const dur = (opts && opts.durationMs) || 5000;
    const rev = (opts && opts.revolutions) || 0.3;
    const cam = scene.activeCamera;
    const eng = viewer.getEngine();
    const canvas = eng.getRenderingCanvas ? eng.getRenderingCanvas() : document.querySelector('canvas');
    const start = cam.alpha;
    const end = start + rev * 2 * Math.PI;
    const t0 = Date.now();
    if (window.__demoOrbitHandle) { clearInterval(window.__demoOrbitHandle); window.__demoOrbitHandle = null; }
    // Save then strip all camera inputs so they can't clobber our writes.
    let savedInputs = null;
    try {
      if (cam.inputs && cam.inputs.attached) {
        savedInputs = Object.keys(cam.inputs.attached).slice();
        cam.detachControl(canvas);
        for (const t of savedInputs) cam.inputs.removeByType(t);
      }
    } catch (_) {}
    return new Promise(resolve => {
      const h = setInterval(() => {
        const t = Math.min(1, (Date.now() - t0) / dur);
        const k = t < 0.5 ? 2 * t * t : 1 - Math.pow(-2 * t + 2, 2) / 2;
        cam.alpha = start + (end - start) * k;
        try { eng.beginFrame(); scene.render(); eng.endFrame(); } catch (_) {}
        if (t >= 1) {
          clearInterval(h);
          if (window.__demoOrbitHandle === h) window.__demoOrbitHandle = null;
          // Re-add inputs (use Babylon's defaults — addKeyboard / addMouseWheel
          // / addPointers are convenience methods on ArcRotateCameraInputsManager).
          try {
            if (cam.inputs && cam.inputs.addPointers) cam.inputs.addPointers();
            if (cam.inputs && cam.inputs.addMouseWheel) cam.inputs.addMouseWheel();
            if (cam.inputs && cam.inputs.addKeyboard) cam.inputs.addKeyboard();
            if (cam.attachControl) cam.attachControl(canvas, true);
          } catch (_) {}
          resolve({ ok: true, alphaEnd: cam.alpha });
        }
      }, 33);
      window.__demoOrbitHandle = h;
    });
  },

  // Generic camera tween — alpha / beta / radius / target.
  async demoTweenCamera(opts) {
    const dur = (opts && opts.durationMs) || 1500;
    const cam = scene.activeCamera;
    const startAlpha = cam.alpha, endAlpha = (opts && opts.alpha != null) ? opts.alpha : startAlpha;
    const startBeta  = cam.beta,  endBeta  = (opts && opts.beta  != null) ? opts.beta  : startBeta;
    const startRad   = cam.radius,endRad   = (opts && opts.radius!= null) ? opts.radius: startRad;
    const t0 = Date.now();
    return new Promise(resolve => {
      const h = setInterval(() => {
        const t = Math.min(1, (Date.now() - t0) / dur);
        const k = t < 0.5 ? 2 * t * t : 1 - Math.pow(-2 * t + 2, 2) / 2;
        cam.alpha  = startAlpha + (endAlpha - startAlpha) * k;
        cam.beta   = startBeta  + (endBeta  - startBeta)  * k;
        cam.radius = startRad   + (endRad   - startRad)   * k;
        if (t >= 1) { clearInterval(h); resolve({ ok: true }); }
      }, 33);
    });
  },

  // Visibly walk a path through the outline: expand all ancestors,
  // scroll the row into view, flash it. (Same `findInOutline` used by
  // the canvas right-click → Reveal action — exposed here so a CLI
  // can drive a guided tour through specific entries.)
  demoExpandPath(opts) {
    const e = findEntry(opts && opts.name);
    if (!e) return { error: 'no entry ' + (opts && opts.name) };
    if (typeof findInOutline === 'function') findInOutline(e);
    return { ok: true, name: e.name };
  },

  // Apply the same hover overlay (translucent teal) that mouse-hover
  // produces. Useful for "ahem, look at this row" demo beats.
  demoHover(opts) {
    const e = findEntry(opts && opts.name);
    if (!e) return { error: 'no entry ' + (opts && opts.name) };
    if (typeof setHoverHighlight === 'function') setHoverHighlight(e);
    return { ok: true, name: e.name };
  },
  demoUnhover() { if (typeof setHoverHighlight === 'function') setHoverHighlight(null); return { ok: true }; },

  // Open the canvas-style right-click context menu visibly + optionally
  // click one of its actions. This drives the same code path as a real
  // mouse right-click, including the Hide → row-flash behavior.
  demoCtxMenu(opts) {
    const e = findEntry(opts && opts.name);
    if (!e) return { error: 'no entry ' + (opts && opts.name) };
    const x = (opts && opts.x) || 720;
    const y = (opts && opts.y) || 360;
    if (typeof openContextMenu !== 'function') return { error: 'no openContextMenu' };
    openContextMenu(x, y, e);
    if (opts && opts.action) {
      const m = document.getElementById('ctxMenu');
      const item = m && m.querySelector('[data-act="' + opts.action + '"]');
      if (item) {
        // Defer the click so the menu is visible for a beat.
        setTimeout(() => item.click(), (opts && opts.delayMs) || 600);
      }
    }
    return { ok: true, name: e.name, action: (opts && opts.action) || null };
  },

  // Frame the camera tightly on a detected pin cluster. Useful to
  // showcase pin detection on QFN / LGA / through-hole.
  async demoFramePin(opts) {
    const id = (opts && opts.id) || 1;
    const entry = assemblyTree.find(x => x.isPinEntry && x.pinId === id);
    if (!entry) return { error: 'no pin entry id=' + id };
    frameOnEntry(entry);
    return { ok: true, id, name: entry.name };
  },

  // Source-label readback so a demo driver can verify the right STEP
  // is loaded BEFORE pressing record. Returns the topbar text + mesh
  // count — both authoritative for "is the WAGO loaded yet".
  demoState() {
    const tb = document.getElementById('topSource');
    const eng = viewer && viewer.getEngine && viewer.getEngine();
    // Babylon 9 inspector mounts at #babylon-inspector-container (not the
    // older Babylon 8 #topPart). Check for the new mount point.
    const inspectorMount = document.getElementById('babylon-inspector-container');
    return {
      sourceLabel: tb ? tb.textContent.trim().slice(0, 200) : null,
      meshCount: scene && scene.meshes ? scene.meshes.length : 0,
      pinCount: pinClusters ? pinClusters.length : 0,
      treeRootName: assemblyTree.find(e => e.depth === 0) ? assemblyTree.find(e => e.depth === 0).name : null,
      fps: eng && eng.getFps ? Math.round(eng.getFps()) : null,
      inspectorOpen: !!(scene && scene.debugLayer && scene.debugLayer.isVisible && scene.debugLayer.isVisible()),
      inspectorMounted: !!inspectorMount && inspectorMount.children.length > 0,
    };
  },

  // measurePick — synthesize a real Babylon PickingInfo on a named entry's
  // mesh and route it through the same addMeasurePick handler the mouse
  // click fires. Drives the demo measure-tool clip without faking the HUD.
  //
  // Args: { entryName: 'Pin 1', faceFraction: 0.5 }
  // - entryName: the components-outline entry to pick on (matches findEntry).
  // - faceFraction: 0..1, which triangle in the mesh's face buffer to pick.
  //   0.5 = middle triangle; vary to pick distinct faces on the same mesh.
  //
  // Returns: { ok, kind, point, faceId, mesh } or { error }
  measurePick(opts) {
    if (!measureActive) toggleMeasure();
    const e = findEntry(opts && opts.entryName);
    if (!e) return { error: 'no entry ' + (opts && opts.entryName) };
    const mesh = (e.allMeshes || []).find(m => m && m.getTotalIndices && m.getTotalIndices() > 0);
    if (!mesh) return { error: 'entry has no pickable mesh' };
    const indices = mesh.getIndices();
    const positions = mesh.getVerticesData(BABYLON.VertexBuffer.PositionKind);
    if (!indices || !positions) return { error: 'mesh has no triangle data' };
    const triCount = indices.length / 3;
    const ff = (opts && opts.faceFraction != null) ? opts.faceFraction : 0.5;
    const faceId = Math.max(0, Math.min(triCount - 1, Math.round(ff * (triCount - 1))));
    const i0 = indices[faceId * 3], i1 = indices[faceId * 3 + 1], i2 = indices[faceId * 3 + 2];
    const v0 = new BABYLON.Vector3(positions[i0 * 3], positions[i0 * 3 + 1], positions[i0 * 3 + 2]);
    const v1 = new BABYLON.Vector3(positions[i1 * 3], positions[i1 * 3 + 1], positions[i1 * 3 + 2]);
    const v2 = new BABYLON.Vector3(positions[i2 * 3], positions[i2 * 3 + 1], positions[i2 * 3 + 2]);
    // Centroid of the picked triangle in world space.
    const localCentroid = v0.add(v1).add(v2).scale(1 / 3);
    const worldMatrix = mesh.computeWorldMatrix(true);
    const worldPoint = BABYLON.Vector3.TransformCoordinates(localCentroid, worldMatrix);
    // Build a PickingInfo with the same fields scene.pick() returns.
    const pi = new BABYLON.PickingInfo();
    pi.hit = true;
    pi.pickedPoint = worldPoint;
    pi.pickedMesh = mesh;
    pi.faceId = faceId;
    pi.distance = BABYLON.Vector3.Distance(scene.activeCamera.position, worldPoint);
    // Route through the same addMeasurePick handler the mouse click fires.
    addMeasurePick(pi);
    return {
      ok: true,
      entryName: e.name, meshName: mesh.name,
      faceId,
      point_mm: { x: worldPoint.x * M_TO_MM, y: worldPoint.y * M_TO_MM, z: worldPoint.z * M_TO_MM },
      pickIndex: measurePicks.length,
    };
  },

  // measureClear — drop both picks and reset the HUD without toggling
  // measure mode off. Useful between staged demo beats.
  measureClear() {
    if (typeof clearMeasure === 'function') clearMeasure();
    return { ok: true };
  },
};

function findEntry(name) {
  if (typeof name === 'number') return nodeById.get(name);
  if (!name) return null;
  // Exact match first.
  let e = assemblyTree.find(e => e.name === name);
  if (e) return e;
  // Case-insensitive fallback.
  const lower = name.toLowerCase();
  return assemblyTree.find(e => e.name.toLowerCase() === lower);
}

function setupEvalPolling() {
  async function tick() {
    try {
      const r = await fetch('eval/pending');
      const body = await r.json();
      const job = body.job;
      if (job) {
        let result = null;
        try {
          const fn = new (Object.getPrototypeOf(async function () {}).constructor)(job.code);
          result = await fn();
        } catch (e) {
          result = { error: e.message || String(e) };
        }
        await fetch('eval/' + job.id + '/result', {
          method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(result),
        });
      }
    } catch (e) { /* server may be transiently down */ }
    setTimeout(tick, 200);
  }
  setTimeout(tick, 250);
}

function setupCommandPolling() {
  // Reserved for HTTP commands posted to /api/command. Kept lightweight —
  // most action verbs go through /eval rather than the command bus.
  async function tick() {
    try {
      const r = await fetch('api/poll-command');
      const body = await r.json();
      // No-op handler for now; expanded as needed.
      void body;
    } catch (e) {}
    setTimeout(tick, 1000);
  }
  setTimeout(tick, 1000);
}

// =====================================================================
// Boot
// =====================================================================

boot().catch((e) => {
  console.error('boot failed:', e);
  setSplash('Boot failed — see console: ' + e.message);
});
</script>
</body>
</html>