/* 拾取、悬停、隐藏与选中态 */
/* ---- picking & hiding ---- */
const ray = new THREE.Raycaster(); let sel = null, hov = null;
/* 拾取列表与 NDC 向量复用同一实例：旧版每次 pointermove 都 filter 出一个新数组 +
   新建 Vector2（高频下纯垃圾）。可见性逐次重算，语义与 filter 完全一致
   ——three r159 的 Raycaster 不检查 object.visible，只能靠这里过滤。 */
const pickList = [], ndcPick = new THREE.Vector2();
function pick(e) {
  const r = cv.getBoundingClientRect();
  ndcPick.set(((e.clientX-r.left)/r.width)*2-1, -((e.clientY-r.top)/r.height)*2+1);
  ray.setFromCamera(ndcPick, cam);
  pickList.length = 0;
  for (const m of meshes) if (m.visible) pickList.push(m);
  if (window.isHarnessVisible && isHarnessVisible() && window.harnessMeshes) {
    for (const m of harnessMeshes) if (m.visible) pickList.push(m);
  }
  const hit = ray.intersectObjects(pickList, false)[0];
  return hit ? hit.object : null;
}
/* BOM 表高亮行只记一行：旧版每次点选/ESC 都要把整张表（13 行零件 + 10 行螺钉）
   的 style.background 全刷一遍，纯属多余 DOM 写入。 */
let bomHlRow = null;
function bomHlClear() { if (bomHlRow) { bomHlRow.style.background = ''; bomHlRow = null; } }
function dimsStr(p) {
  if (!p.dims) return '';
  const f = d => String(Math.round(d * 10) / 10);
  return '外形 ' + f(p.dims[0]) + ' × ' + f(p.dims[1]) + ' × ' + f(p.dims[2]) + ' mm（X·Y·Z）';
}
function hover(e) {
  const o = pick(e); if (o === hov) return; hov = o;
  const n = document.getElementById('note');
  if (!o) { n.style.display = 'none'; return; }
  const p = o.userData;
  n.style.display = 'block';
  if (p.harness) {
    n.innerHTML = '<b>' + p.cn + '</b><br><small style="color:#fbbf24">' + p.name + '</small>';
  } else {
    n.innerHTML = '<b>#' + p.idx + ' ' + p.cn + '</b><br><small>' + p.name +
      ' · ' + (p.printed ? '3D打印件' : '电机/已有件') +
      (dimsStr(p) ? '<br>' + dimsStr(p) : '') + '</small>';
  }
}
function hidePart(m) {
  if (!m) return;
  const p = m.userData;
  if (m === sel) {
    m.material.emissive.setHex(0);
    m.material.emissiveIntensity = 0;
    sel = null;
  }
  m.visible = false;
  if (m.chk) m.chk.checked = false;
  const n = document.getElementById('note');
  if (n) n.style.display = 'none';
  const hud = document.getElementById('hud');
  if (hud) {
    hud.innerHTML = '已隐藏：<b>#' + p.idx + ' ' + p.cn + '</b> <span id="unhideBtn" style="color:var(--ac);cursor:pointer;text-decoration:underline;margin-left:6px">撤销</span> <small style="color:var(--dim)">（可在左侧零件树勾选或点击“全选”恢复）</small>';
    const ub = document.getElementById('unhideBtn');
    if (ub) ub.onclick = () => {
      m.visible = true;
      if (m.chk) m.chk.checked = true;
      hud.textContent = '';
      requestRender();
    };
  }
  requestRender();
}
cv.addEventListener('contextmenu', e => {
  e.preventDefault();
  if (panDist > 6) return;          // ignore drag panning
  let target = sel;
  if (!target) target = pick(e);
  if (target) hidePart(target);
});
window.addEventListener('keydown', e => {
  if (e.key === 'h' || e.key === 'H' || e.key === 'Delete') {
    if (sel) hidePart(sel);
  } else if (e.key === 'Escape') {
    clearScrewHl();
    if (sel) {
      sel.material.emissive.setHex(0);
      sel.material.emissiveIntensity = 0;
      sel = null;
      const hud = document.getElementById('hud');
      if (hud) hud.textContent = '';
      bomHlClear();
      requestRender();
    }
  }
});
cv.addEventListener('click', e => {
  const o = pick(e);
  if (o === sel) {
    if (sel) { sel.material.emissive.setHex(0); sel.material.emissiveIntensity = 0; sel = null; }
    bomHlClear();
    clearScrewHl();
    const hud = document.getElementById('hud'); if (hud) { hud.textContent = ''; delete hud.dataset.scrHl; }
    requestRender();
    return;
  }
  if (sel && !sel.userData.screw && !sel.userData.harness) { sel.material.emissive.setHex(0); sel.material.emissiveIntensity = 0; }
  sel = o;
  if (sel && !sel.userData.screw && !sel.userData.harness) { sel.material.emissive.setHex(0x2f6bff); sel.material.emissiveIntensity = .55; }
  const tb = document.querySelector('#bom tbody');
  bomHlClear();
  const hud = document.getElementById('hud');
  hud.textContent = '';
  delete hud.dataset.scrHl;
  if (sel) {
    const u = sel.userData;
    if (u.screw) { highlightSpec(u.spec, false); requestRender(); return; }   // 点中螺钉 -> 反查 BOM 行并定位
    if (u.harness) {
      hud.innerHTML = '<b>' + u.cn + '</b> · <span style="color:#f59e0b">' + u.name +
        '</span> · 2×CAN通信 + 2×24V供电 · <span style="color:var(--ok)">4芯高柔拖链电缆/T型分接</span>';
      requestRender();
      return;
    }
    hud.innerHTML = '<b>#' + u.idx + ' ' + u.cn + '</b> · ' + (u.vol / 1000).toFixed(1) +
      ' cm3 · ' + (u.printed ? '打印件' : '电机/已有件') +
      ' <span style="margin-left:8px;color:var(--warn);font-size:11px">[右键单击或按H键隐藏此部件]</span>';
    const tr = tb.querySelector('[data-idx="' + u.idx + '"]');
    if (tr) { tr.style.background = '#22406b'; bomHlRow = tr; tr.scrollIntoView({block:'nearest'}); }
  }
  requestRender();
});