(() => {
  const $ = (sel, root = document) => root.querySelector(sel);
  const $$ = (sel, root = document) => [...root.querySelectorAll(sel)];

  const state = {
    tab: "fabric",
    site: "ATC1",
    fabric: null,
    racks: null,
    vlans: null,
    fleet: null,
    portmap: null,
    selectedSwitchId: null,
    selectedPort: null,
    selectedRackId: null,
    selectedVlanId: null,
    placeDeviceId: null,
    wireDeviceId: null,
    anim: 0,
    raf: 0,
  };

  async function api(method, url, body) {
    const opts = { method, headers: {} };
    if (body !== undefined) {
      opts.headers["Content-Type"] = "application/json";
      opts.body = JSON.stringify(body);
    }
    const r = await fetch(url, opts);
    if (!r.ok) throw new Error(await r.text());
    return r.json();
  }

  function escape(s) {
    return String(s ?? "")
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;");
  }

  function openNetwork() {
    const drawer = $("#network-drawer");
    const scrim = $("#scrim");
    if (!drawer) return;
    ["#chat-drawer", "#ops-drawer", "#ai-drawer", "#reports-drawer"].forEach((id) => {
      const el = $(id);
      if (el) {
        el.classList.remove("open");
        el.setAttribute("aria-hidden", "true");
      }
    });
    drawer.classList.add("open");
    drawer.setAttribute("aria-hidden", "false");
    if (scrim) {
      scrim.classList.add("open");
      scrim.dataset.mode = "network-drawer";
    }
    showTab(state.tab);
    refresh();
  }

  function closeNetwork() {
    closeStudio();
    const drawer = $("#network-drawer");
    const scrim = $("#scrim");
    drawer?.classList.remove("open");
    drawer?.setAttribute("aria-hidden", "true");
    if (scrim?.dataset.mode === "network-drawer") {
      scrim.classList.remove("open");
      delete scrim.dataset.mode;
    }
    stopPulse();
  }

  function showTab(tab) {
    state.tab = tab;
    $$("#network-tabs .chip").forEach((c) => c.classList.toggle("active", c.dataset.ntab === tab));
    $("#network-fabric")?.classList.toggle("hidden", tab !== "fabric");
    $("#network-racks")?.classList.toggle("hidden", tab !== "racks");
    $("#network-vlans")?.classList.toggle("hidden", tab !== "vlans");
    if (tab === "fabric") startPulse();
    else stopPulse();
  }

  function stopPulse() {
    if (state.raf) cancelAnimationFrame(state.raf);
    state.raf = 0;
  }

  function startPulse() {
    stopPulse();
    const tick = (ts) => {
      state.anim = ts / 1000;
      drawCables();
      state.raf = requestAnimationFrame(tick);
    };
    state.raf = requestAnimationFrame(tick);
  }

  async function refresh() {
    const mountHint = $("#network-status");
    if (mountHint) mountHint.textContent = "Loading…";
    try {
      const [fleet, fabric, racks, vlans] = await Promise.all([
        api("GET", "/api/fleet"),
        api("GET", "/api/network/fabric"),
        api("GET", "/api/racks"),
        api("GET", "/api/network/vlans"),
      ]);
      state.fleet = fleet;
      state.fabric = fabric;
      state.racks = racks;
      state.vlans = vlans;
      const switches = (fabric.switches || []).length
        ? fabric.switches
        : (fleet.devices || []).filter((d) => d.is_switch);
      if (!state.selectedSwitchId && switches[0]) {
        state.selectedSwitchId = switches[0].id;
      }
      if (state.selectedSwitchId) {
        state.portmap = await api("GET", `/api/network/switches/${state.selectedSwitchId}/ports`);
      }
      const wired = state.portmap?.wired_count || 0;
      const ports = state.portmap?.switch?.port_count || 0;
      if (mountHint) {
        mountHint.textContent = `${switches.length} switch · ${wired}/${ports} ports wired · manual port map`;
      }
      renderFabric();
      renderRacks();
      renderVlans();
      if (state.tab === "fabric") startPulse();
    } catch (e) {
      if (mountHint) mountHint.textContent = "Error: " + e.message;
    }
  }

  function devices() {
    return state.fleet?.devices || [];
  }

  function switchList() {
    const fromFabric = state.fabric?.switches || [];
    if (fromFabric.length) return fromFabric;
    return devices()
      .filter((d) => d.is_switch)
      .map((s) => ({
        id: s.id,
        name: s.name,
        service_tag: s.service_tag,
        ip: s.ip || s.idrac_ip,
        subnet: s.subnet,
        model: s.model,
        connected_device_ids: [],
      }));
  }

  function renderFabric() {
    const root = $("#network-fabric");
    if (!root) return;
    const switches = switchList();
    const pm = state.portmap;
    const sw = pm?.switch;
    const ports = pm?.ports || [];
    const selected = state.selectedPort;
    const selPort = ports.find((p) => p.port === selected);

    const servers = devices().filter(
      (d) => d.is_server || d.is_storage || d.is_chassis || d.is_idrac
    );

    root.innerHTML = `
      <div class="sw-fabric">
        <aside class="sw-list-pane">
          <h4>Switches</h4>
          <div class="sw-cards">
            ${switches
              .map((s) => {
                const active = s.id === state.selectedSwitchId ? " active" : "";
                return `<button type="button" class="sw-card${active}" data-sw="${s.id}">
                  <div class="sw-card-ico" aria-hidden="true"></div>
                  <div class="sw-card-body">
                    <strong>${escape(s.name)}</strong>
                    <span>${escape(s.model || "Switch")}</span>
                    <span class="mono">ST=${escape(s.service_tag || "—")} · ${escape(s.ip || "—")}</span>
                  </div>
                </button>`;
              })
              .join("") || '<p class="hint">No switches in OME.</p>'}
          </div>
          <p class="hint">${escape(pm?.note || "Select a switch to map ports.")}</p>
        </aside>

        <section class="sw-face-pane">
          ${
            sw
              ? `<div class="sw-faceplate" id="sw-faceplate">
                  <div class="sw-face-head">
                    <div class="sw-brand-bar">
                      <span class="sw-dell">DELL</span>
                      <span class="sw-model">${escape((sw.model || "").replace("Dell EMC Networking ", "").replace(" switch/router", ""))}</span>
                      <span class="sw-st mono">${escape(sw.service_tag || "")}</span>
                    </div>
                    <div class="sw-face-meta">
                      <span>${escape(sw.name)}</span>
                      <span class="mono">${escape(sw.ip || "—")} · ${escape(sw.subnet || "")}</span>
                      <span class="sw-wired-pill">${pm.wired_count}/${sw.port_count} ports wired</span>
                    </div>
                  </div>
                  <div class="sw-port-grid" id="sw-port-grid">
                    ${ports
                      .map((p) => {
                        const cls = [
                          "sw-port",
                          p.wired ? "wired" : "empty",
                          selected === p.port ? "selected" : "",
                          p.link?.device?.connected ? "live" : "",
                        ]
                          .filter(Boolean)
                          .join(" ");
                        const tip = p.wired
                          ? `${p.label} → ${(p.link.device && p.link.device.name) || "?"} / ${p.link.device_port || "?"}`
                          : `${p.label} — click to wire`;
                        return `<button type="button" class="${cls}" data-port="${p.port}" title="${escape(tip)}">
                          <span class="sw-port-num">${p.port}</span>
                          ${p.wired ? '<span class="sw-port-dot"></span>' : ""}
                        </button>`;
                      })
                      .join("")}
                  </div>
                  <div class="sw-cable-stage">
                    <canvas id="sw-cable-canvas"></canvas>
                    <div class="sw-peer-rail" id="sw-peer-rail">
                      ${ports
                        .filter((p) => p.wired && p.link?.device)
                        .map((p) => {
                          const d = p.link.device;
                          return `<div class="sw-peer-chip ${d.connected ? "up" : "down"}" data-peer-port="${p.port}">
                            <span class="sw-peer-port">P${p.port}</span>
                            <div>
                              <strong>${escape(d.name)}</strong>
                              <span class="mono">NIC ${escape(p.link.device_port || "—")} · ST=${escape(d.service_tag || "—")}</span>
                            </div>
                          </div>`;
                        })
                        .join("") || '<p class="hint">No ports wired yet — click a port on the switch.</p>'}
                    </div>
                  </div>
                </div>`
              : `<p class="hint" style="padding:1rem">Select a switch.</p>`
          }
        </section>

        <aside class="sw-wire-pane" id="sw-wire-pane">
          ${renderWirePane(selPort, servers)}
        </aside>
      </div>
    `;

    root.querySelectorAll("[data-sw]").forEach((btn) => {
      btn.addEventListener("click", async () => {
        state.selectedSwitchId = Number(btn.dataset.sw);
        state.selectedPort = null;
        state.portmap = await api("GET", `/api/network/switches/${state.selectedSwitchId}/ports`);
        renderFabric();
        startPulse();
      });
    });
    root.querySelectorAll("[data-port]").forEach((btn) => {
      btn.addEventListener("click", () => {
        state.selectedPort = Number(btn.dataset.port);
        renderFabric();
        startPulse();
      });
    });
    $("#sw-wire-save")?.addEventListener("click", saveWire);
    $("#sw-wire-clear")?.addEventListener("click", clearWire);
    $("#sw-wire-device")?.addEventListener("change", onWireDeviceChange);
    requestAnimationFrame(() => drawCables());
  }

  function renderWirePane(selPort, servers) {
    if (!selPort) {
      return `<h4>Port wiring</h4><p class="hint">Click a port on the switch faceplate to map it to a server NIC / port.</p>`;
    }
    const link = selPort.link;
    const curDev = link?.device_id || state.wireDeviceId || "";
    const curPort = link?.device_port || "";
    const opts = servers
      .slice()
      .sort((a, b) => (a.name || "").localeCompare(b.name || ""))
      .map(
        (d) =>
          `<option value="${d.id}" ${String(d.id) === String(curDev) ? "selected" : ""}>${escape(d.name)} · ST=${escape(d.service_tag || "—")}</option>`
      )
      .join("");
    return `
      <h4>Wire ${escape(selPort.label)}</h4>
      <p class="hint">Switch port <strong>${selPort.port}</strong> → server + NIC/port</p>
      <label class="sw-field">Server / endpoint
        <select id="sw-wire-device">
          <option value="">— select —</option>
          ${opts}
        </select>
      </label>
      <label class="sw-field">Server port / NIC
        <input type="text" id="sw-wire-nic" list="sw-nic-list" placeholder="e.g. NIC.Slot.1-1 / eth0 / Port 2" value="${escape(curPort)}" />
        <datalist id="sw-nic-list"></datalist>
      </label>
      <label class="sw-field">Note
        <input type="text" id="sw-wire-note" placeholder="optional" value="${escape(link?.note || "")}" />
      </label>
      <div class="sw-wire-actions">
        <button type="button" class="btn primary" id="sw-wire-save">Save link</button>
        ${selPort.wired ? `<button type="button" class="btn danger" id="sw-wire-clear">Unwire</button>` : ""}
      </div>
      ${
        link?.device
          ? `<div class="sw-wire-current">
              <strong>Current</strong>
              <span>${escape(link.device.name)}</span>
              <span class="mono">${escape(link.device_port || "—")} · ${link.device.connected ? "connected" : "offline"}</span>
            </div>`
          : ""
      }
    `;
  }

  async function onWireDeviceChange() {
    const id = Number($("#sw-wire-device")?.value || 0);
    state.wireDeviceId = id || null;
    const list = $("#sw-nic-list");
    if (!list || !id) return;
    list.innerHTML = "";
    try {
      const data = await api("GET", `/api/devices/${id}/nics`);
      (data.nics || []).forEach((n) => {
        const opt = document.createElement("option");
        opt.value = n.fqdd || n.name;
        opt.label = `${n.name}${n.mac ? " · " + n.mac : ""}`;
        list.appendChild(opt);
      });
      if ((data.nics || [])[0] && !$("#sw-wire-nic")?.value) {
        $("#sw-wire-nic").value = data.nics[0].fqdd || data.nics[0].name || "";
      }
    } catch (_) {
      /* ignore */
    }
  }

  async function saveWire() {
    const port = state.selectedPort;
    const deviceId = Number($("#sw-wire-device")?.value || 0);
    const nic = ($("#sw-wire-nic")?.value || "").trim();
    const note = ($("#sw-wire-note")?.value || "").trim();
    if (!state.selectedSwitchId || !port) return;
    if (!deviceId) {
      alert("Select a server / endpoint");
      return;
    }
    try {
      state.portmap = await api("PUT", `/api/network/switches/${state.selectedSwitchId}/ports/${port}`, {
        switch_port: port,
        device_id: deviceId,
        device_port: nic,
        note,
      });
      renderFabric();
      startPulse();
    } catch (e) {
      alert("Save failed: " + e.message);
    }
  }

  async function clearWire() {
    const port = state.selectedPort;
    if (!state.selectedSwitchId || !port) return;
    if (!confirm(`Unwire switch port ${port}?`)) return;
    try {
      state.portmap = await api("DELETE", `/api/network/switches/${state.selectedSwitchId}/ports/${port}`);
      renderFabric();
      startPulse();
    } catch (e) {
      alert(e.message);
    }
  }

  function drawCables() {
    const canvas = $("#sw-cable-canvas");
    const grid = $("#sw-port-grid");
    const rail = $("#sw-peer-rail");
    const stage = canvas?.parentElement;
    if (!canvas || !grid || !stage || state.tab !== "fabric") return;
    const dpr = window.devicePixelRatio || 1;
    const w = stage.clientWidth;
    const h = stage.clientHeight;
    if (w < 10 || h < 10) return;
    canvas.width = Math.floor(w * dpr);
    canvas.height = Math.floor(h * dpr);
    canvas.style.width = w + "px";
    canvas.style.height = h + "px";
    const ctx = canvas.getContext("2d");
    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
    ctx.clearRect(0, 0, w, h);

    const stageBox = stage.getBoundingClientRect();
    const t = state.anim;
    const ports = state.portmap?.ports || [];

    ports.forEach((p) => {
      if (!p.wired) return;
      const portBtn = grid.querySelector(`[data-port="${p.port}"]`);
      const peer = rail?.querySelector(`[data-peer-port="${p.port}"]`);
      if (!portBtn || !peer) return;
      const a = portBtn.getBoundingClientRect();
      const b = peer.getBoundingClientRect();
      const x1 = a.left + a.width / 2 - stageBox.left;
      const y1 = a.bottom - stageBox.top;
      const x2 = b.left - stageBox.left;
      const y2 = b.top + b.height / 2 - stageBox.top;
      const live = !!p.link?.device?.connected;
      const midY = y1 + Math.max(24, (y2 - y1) * 0.35);

      ctx.beginPath();
      ctx.moveTo(x1, y1);
      ctx.bezierCurveTo(x1, midY, x2 - 40, y2, x2, y2);
      ctx.strokeStyle = live ? "rgba(61,255,224,0.55)" : "rgba(0,168,232,0.35)";
      ctx.lineWidth = live ? 2.4 : 1.6;
      ctx.setLineDash([8, 7]);
      ctx.lineDashOffset = -t * (live ? 55 : 22);
      ctx.stroke();

      if (live) {
        const pulse = (Math.sin(t * 5 + p.port) + 1) / 2;
        ctx.beginPath();
        ctx.moveTo(x1, y1);
        ctx.bezierCurveTo(x1, midY, x2 - 40, y2, x2, y2);
        ctx.strokeStyle = `rgba(255,154,60,${0.2 + pulse * 0.55})`;
        ctx.lineWidth = 3.2;
        ctx.setLineDash([]);
        ctx.stroke();
      }

      // moving packet
      const u = (t * 0.35 + p.port * 0.07) % 1;
      const pt = bezierPoint(x1, y1, x1, midY, x2 - 40, y2, x2, y2, u);
      ctx.beginPath();
      ctx.arc(pt.x, pt.y, live ? 3.2 : 2.2, 0, Math.PI * 2);
      ctx.fillStyle = live ? "#ff9a3c" : "#00a8e8";
      ctx.fill();
    });
  }

  function bezierPoint(x0, y0, x1, y1, x2, y2, x3, y3, t) {
    const u = 1 - t;
    return {
      x: u * u * u * x0 + 3 * u * u * t * x1 + 3 * u * t * t * x2 + t * t * t * x3,
      y: u * u * u * y0 + 3 * u * u * t * y1 + 3 * u * t * t * y2 + t * t * t * y3,
    };
  }





  /* ===== Dell Rack Design Studio ===== */
  const U_OVERVIEW = 7;
  const U_STUDIO = 56; // full-bleed faceplate height per U

  function roleOf(it) {
    return (it.category || it.catalog?.category || it.device?.role || it.face || "custom").toLowerCase();
  }
  function roleClass(role) {
    const r = (role || "").toLowerCase();
    if (r.includes("switch")) return "switch";
    if (r.includes("storage")) return "storage";
    if (r.includes("chassis")) return "chassis";
    if (r.includes("pdu")) return "pdu";
    if (r.includes("blank")) return "blank";
    if (r.includes("server") || r.includes("blade") || r.includes("vxrail")) return "server";
    return "custom";
  }
  /** u_start = bottom U; device fills u_start .. u_start+h-1 (higher U = toward top of rack). */
  function uSpan(uStart, h) {
    const lo = Math.max(1, Number(uStart) || 1);
    const height = Math.max(1, Number(h) || 1);
    const hi = lo + height - 1;
    return { lo, hi, height, label: height === 1 ? `U${lo}` : `U${lo}–U${hi}` };
  }
  function catalogHeight(sku, fallback = 1) {
    const cat = (state.racks?.catalog || []).find((c) => c.sku === sku);
    const h = Number(cat?.u_height);
    return h > 0 ? h : Math.max(1, Number(fallback) || 1);
  }
  function unitsFree(rk, uStart, h, excludeItemId) {
    const side = state.rackSide || "front";
    const units = rk?.units || 42;
    const span = uSpan(uStart, h);
    if (span.hi > units) return false;
    const items = (rk?.items || []).filter((it) => (it.side || "front") === side);
    for (const it of items) {
      if (excludeItemId != null && (it.id || it.item_id) === excludeItemId) continue;
      const a = it.u_start;
      const b = it.u_start + Math.max(1, it.u_height || 1) - 1;
      if (!(span.hi < a || span.lo > b)) return false;
    }
    return true;
  }
  function rackFillPct(rk) {
    const items = (rk.items || []).filter((it) => (it.side || "front") === "front");
    const used = items.reduce((a, p) => a + Math.max(0, p.u_height || 0), 0);
    const units = rk.units || 42;
    return { used, free: Math.max(0, units - used), pct: Math.round((used / units) * 100), units };
  }
  function allRacksList() {
    const sites = state.racks?.sites || [];
    const show = state.site === "Both" ? sites : sites.filter((s) => s.id === state.site);
    return show.flatMap((s) => (s.racks || []).map((r) => ({ ...r, siteName: s.name })));
  }
  function focusRack() {
    const all = allRacksList();
    return all.find((r) => r.id === state.selectedRackId) || all[0] || null;
  }

  let _faceSeq = 0;
  function faceSvg(face, label, hU, opts = {}) {
    const px = opts.px || U_STUDIO;
    const h = Math.max(px, Math.max(1, hU || 1) * px);
    const w = opts.w || 420;
    const compact = !!opts.compact;
    const title = escape((label || "").slice(0, 36));
    const gid = "fg" + (++_faceSeq);
    const cat = (face || "").toLowerCase();

    if (cat.startsWith("switch")) {
      const n = compact ? 16 : 24;
      let ports = "";
      for (let i = 0; i < n; i++) {
        const x = 40 + i * ((w - 70) / n);
        ports += `<rect x="${x}" y="${h * 0.22}" width="${(w - 70) / n - 1.4}" height="${h * 0.56}" rx="1" fill="#040c12" stroke="#6ecfff" stroke-width="0.7"/>`;
      }
      return `<svg class="ru-face" viewBox="0 0 ${w} ${h}" preserveAspectRatio="none">
        <defs><linearGradient id="${gid}" x1="0" y1="0" x2="0" y2="1"><stop offset="0%" stop-color="#1e5570"/><stop offset="100%" stop-color="#0f3144"/></linearGradient></defs>
        <rect width="${w}" height="${h}" rx="3" fill="url(#${gid})"/>
        <text x="8" y="${h * 0.62}" fill="#b6e7ff" font-size="${compact ? 6 : 9}" font-family="ui-monospace,monospace">DELL</text>
        ${ports}<circle cx="${w - 12}" cy="${h / 2}" r="${compact ? 2 : 3}" fill="#3dffe0"/>
      </svg>`;
    }
    if (cat.startsWith("storage")) {
      const cols = compact ? 10 : 12;
      let bays = "";
      for (let i = 0; i < cols; i++) {
        bays += `<rect x="${10 + i * ((w - 20) / cols)}" y="3" width="${(w - 20) / cols - 1.5}" height="${h - 6}" rx="1.5" fill="#1a1008" stroke="#e08a40" stroke-width="0.7"/>`;
      }
      return `<svg class="ru-face" viewBox="0 0 ${w} ${h}" preserveAspectRatio="none"><rect width="${w}" height="${h}" rx="3" fill="#2a180c"/>${bays}</svg>`;
    }
    if (cat.includes("chassis") || cat === "chassis_mx") {
      const n = compact ? 5 : 8;
      return `<svg class="ru-face" viewBox="0 0 ${w} ${h}" preserveAspectRatio="none">
        <rect width="${w}" height="${h}" rx="3" fill="#1a1430"/>
        ${Array.from({ length: n }, (_, i) => `<rect x="${8 + i * ((w - 16) / n)}" y="4" width="${(w - 16) / n - 3}" height="${h - 8}" rx="2" fill="#2a2150" stroke="#9b8cff" stroke-width="0.7"/>`).join("")}
      </svg>`;
    }
    if (cat.startsWith("pdu")) {
      return `<svg class="ru-face" viewBox="0 0 ${w} ${h}" preserveAspectRatio="none">
        <rect width="${w}" height="${h}" rx="2" fill="#2c2c2c"/>
        ${Array.from({ length: compact ? 8 : 12 }, (_, i) => `<circle cx="${18 + i * ((w - 30) / (compact ? 8 : 12))}" cy="${h / 2}" r="${compact ? 2 : 3}" fill="#111" stroke="#bbb"/>`).join("")}
      </svg>`;
    }
    if (cat.startsWith("blank")) {
      return `<svg class="ru-face" viewBox="0 0 ${w} ${h}" preserveAspectRatio="none"><rect width="${w}" height="${h}" rx="2" fill="#141a22" stroke="#2e3742"/></svg>`;
    }
    const drives = cat.includes("4u") ? 24 : cat.includes("2u") ? 12 : 8;
    const n = compact ? Math.min(drives, 10) : drives;
    let disks = "";
    for (let i = 0; i < n; i++) {
      disks += `<rect x="${36 + i * ((w - 56) / n)}" y="${h * 0.16}" width="${(w - 56) / n - 1.5}" height="${h * 0.68}" rx="1" fill="#071820" stroke="#3dffe0" stroke-width="0.55"/>`;
    }
    return `<svg class="ru-face" viewBox="0 0 ${w} ${h}" preserveAspectRatio="none">
      <defs><linearGradient id="${gid}" x1="0" y1="0" x2="0" y2="1"><stop offset="0%" stop-color="#1c4450"/><stop offset="100%" stop-color="#0c2834"/></linearGradient></defs>
      <rect width="${w}" height="${h}" rx="3" fill="url(#${gid})"/>
      <text x="6" y="${compact ? h * 0.55 : 11}" fill="#9fe" font-size="${compact ? 6 : 8}" font-family="ui-monospace,monospace">PowerEdge</text>
      ${disks}<circle cx="${w - 10}" cy="${h / 2}" r="${compact ? 2 : 3}" fill="#3dffe0"/>
      ${compact ? "" : `<text x="6" y="${h - 3}" fill="#cfe" font-size="7">${title}</text>`}
    </svg>`;
  }

  function ensureStudioRoot() {
    let el = $("#rack-studio");
    if (el) return el;
    el = document.createElement("div");
    el.id = "rack-studio";
    el.className = "rack-studio";
    el.setAttribute("aria-hidden", "true");
    document.body.appendChild(el);
    return el;
  }

  function openStudio(rackId) {
    if (rackId != null) state.selectedRackId = rackId;
    state.studioOpen = true;
    state.studioZoom = state.studioZoom || 1;
    state.rackSide = state.rackSide || "front";
    state.libTab = state.libTab || "catalog";
    state.catalogFamily = state.catalogFamily || "PowerEdge";
    renderRacks(); // keep overview in sync
    renderStudio();
  }

  function closeStudio() {
    state.studioOpen = false;
    state.placeDeviceId = null;
    state.placeSku = null;
    const el = $("#rack-studio");
    if (el) {
      if (el._onKey) document.removeEventListener("keydown", el._onKey);
      el._onKey = null;
      el.classList.remove("open");
      el.setAttribute("aria-hidden", "true");
      el.innerHTML = "";
    }
  }


  function productPhoto(itOrFace, label, opts = {}) {
    const img =
      (typeof itOrFace === "object" && itOrFace
        ? itOrFace.image || itOrFace.catalog?.image || null
        : null) ||
      opts.image ||
      null;
    const face =
      typeof itOrFace === "string"
        ? itOrFace
        : itOrFace?.face || itOrFace?.catalog?.face || "server_1u";
    const fallback = {
      server_1u: "/assets/dell/face-server-1u.jpg?v=bezel2",
      server_2u: "/assets/dell/face-server-2u.jpg?v=bezel2",
      server_4u: "/assets/dell/face-server-4u.jpg?v=bezel2",
      switch_1u: "/assets/dell/face-switch-1u.jpg?v=bezel2",
      switch_2u: "/assets/dell/face-switch-1u.jpg?v=bezel2",
      storage_2u: "/assets/dell/face-storage-2u.jpg?v=bezel2",
      storage_3u: "/assets/dell/face-storage-2u.jpg?v=bezel2",
      chassis_mx: "/assets/dell/face-chassis-mx.jpg?v=bezel2",
      pdu_1u: "/assets/dell/face-pdu-1u.jpg?v=bezel2",
      pdu_0u: "/assets/dell/face-pdu-1u.jpg?v=bezel2",
      blank_1u: "/assets/dell/face-blank-1u.jpg?v=bezel2",
      blank_2u: "/assets/dell/face-blank-1u.jpg?v=bezel2",
      blade: "/assets/dell/face-chassis-mx.jpg?v=bezel2",
      fabric: "/assets/dell/face-switch-1u.jpg?v=bezel2",
      custom: "/assets/dell/face-server-1u.jpg?v=bezel2",
    };
    const src = img || fallback[face] || fallback.custom;
    const cls = opts.compact ? "ru-photo compact" : "ru-photo";
    return `<img class="${cls}" src="${escape(src)}" alt="${escape(label || "")}" loading="lazy" draggable="false" />`;
  }

  function shortModel(name) {
    const s = String(name || "");
    const m = s.match(/\b(R\d{3,4}\w*|MX\d+\w*|S\d{4}\w*|N\d{4}\w*|Z\d{4}\w*|ME\d{4}|DD\d{4}|T\d{3}|XE\d+|C\d{4}\w*|XR\d+|PC-?\d+|PowerConnect\s*\d+|PowerSwitch\s*\S+|PowerVault\s*\S+|VxRail\s*\S+)\b/i);
    if (m) return m[1].replace(/^Power(Edge|Switch|Vault|Connect)\s*/i, "").trim();
    return s.replace(/^PowerEdge\s+/i, "").slice(0, 14) || "Device";
  }

  function tintFor(key) {
    let h = 0;
    const s = String(key || "");
    for (let i = 0; i < s.length; i++) h = (h * 31 + s.charCodeAt(i)) >>> 0;
    return h % 360;
  }

  function facePlate(p) {
    const face = p.face || p.catalog?.face || "server_1u";
    const label = p.label || p.device?.name || p.catalog?.name || "Device";
    const model = p.catalog?.name || p.device?.model || label;
    const code = shortModel(model);
    const hU = p.u_height || 1;
    const rc = roleClass(roleOf(p));
    const sku = p.catalog_sku || p.catalog?.sku || model;
    const hue = tintFor(sku);
    const meta = [
      hU > 1 ? uSpan(p.u_start, hU).label : null,
      hU ? `${hU}U` : null,
      p.device?.service_tag ? `ST ${p.device.service_tag}` : null,
      p.catalog?.category || p.category || rc,
    ]
      .filter(Boolean)
      .join(" · ");
    return `<div class="rs-u-face role-${rc}" style="--face-hue:${hue}">
      ${productPhoto({ face, image: p.image || p.catalog?.image }, label)}
      <div class="rs-u-plate">
        <span class="rs-u-code">${escape(code)}</span>
        <strong>${escape(label)}</strong>
        <span>${escape(meta)}</span>
      </div>
    </div>`;
  }

  function miniElevation(rk) {
    const units = rk.units || 42;
    const items = (rk.items || []).filter((it) => (it.side || "front") === "front");
    const occ = new Array(units + 1).fill(null);
    items.forEach((p) => {
      for (let u = p.u_start; u < p.u_start + p.u_height && u <= units; u++) occ[u] = p;
    });
    const rows = [];
    for (let u = units; u >= 1; u--) {
      const p = occ[u];
      const isStart = p && p.u_start === u;
      if (p && !isStart) continue;
      if (p && isStart) {
        rows.push(`<div class="ov-slot filled role-${roleClass(roleOf(p))}" style="height:${Math.max(3, p.u_height * U_OVERVIEW)}px" title="${escape(p.label || "")} · ${uSpan(p.u_start, p.u_height).label}"></div>`);
      } else {
        rows.push(`<div class="ov-slot empty" style="height:${U_OVERVIEW}px"></div>`);
      }
    }
    const fill = rackFillPct(rk);
    return `<button type="button" class="ov-rack" data-open-studio="${rk.id}">
      <div class="ov-rack-top"><strong>${escape(rk.name)}</strong><span>${fill.used}/${fill.units}U · ${fill.pct}%</span></div>
      <div class="ov-rack-body">${rows.join("")}</div>
      <div class="ov-rack-cta">Open Design Studio</div>
    </button>`;
  }

  function renderRacks() {
    const root = $("#network-racks");
    if (!root || !state.racks) return;
    const allRacks = allRacksList();
    if (!state.selectedRackId && allRacks[0]) state.selectedRackId = allRacks[0].id;

    root.innerHTML = `
      <div class="rd-bar">
        <div class="rd-bar-left">
          <div class="chip-grid">
            ${["ATC1", "ATC2", "Both"].map((s) => `<button type="button" class="chip ${state.site === s ? "active" : ""}" data-site="${s}">${s}</button>`).join("")}
          </div>
        </div>
        <div class="rd-bar-right">
          <button type="button" class="btn primary" id="rd-open-studio" ${allRacks.length ? "" : "disabled"}>Design Studio</button>
          <button type="button" class="btn" id="net-refresh-racks">Refresh</button>
        </div>
      </div>
      <div class="rd-overview">
        <header class="rd-overview-head">
          <div>
            <h3>Rack floor · ${escape(state.site === "Both" ? "ATC1 + ATC2" : state.site)}</h3>
            <p>Klik een rack om de Design Studio te openen (inzoomen, alle 42U, Dell catalogus).</p>
          </div>
          <div class="rd-legend">
            <span class="lg server">Server</span><span class="lg switch">Switch</span>
            <span class="lg storage">Storage</span><span class="lg chassis">Chassis</span><span class="lg pdu">PDU</span>
          </div>
        </header>
        <div class="rd-gallery">
          ${allRacks.map((rk) => miniElevation(rk)).join("") || '<p class="hint">Geen racks</p>'}
        </div>
      </div>
    `;

    root.querySelectorAll("[data-site]").forEach((btn) =>
      btn.addEventListener("click", () => {
        state.site = btn.dataset.site;
        state.selectedRackId = null;
        renderRacks();
      })
    );
    root.querySelectorAll("[data-open-studio]").forEach((btn) =>
      btn.addEventListener("click", () => openStudio(Number(btn.dataset.openStudio)))
    );
    $("#rd-open-studio")?.addEventListener("click", () => openStudio(state.selectedRackId));
    $("#net-refresh-racks")?.addEventListener("click", () => refresh());

    if (state.studioOpen) renderStudio();
  }

  function renderStudio() {
    const el = ensureStudioRoot();
    const rk = focusRack();
    const catalog = state.racks?.catalog || [];
    const families = [...new Set(catalog.map((c) => c.family))];
    const unplaced = state.racks?.unplaced || [];
    const allRacks = allRacksList();
    if (!rk) {
      el.innerHTML = `<div class="rs-backdrop"></div><div class="rs-panel"><p class="hint">Geen rack</p><button class="btn" id="rs-close">Close</button></div>`;
      el.classList.add("open");
      $("#rs-close")?.addEventListener("click", closeStudio);
      return;
    }
    state.studioZoom = Math.min(1.8, Math.max(0.7, state.studioZoom || 1.15));
    const q = (state.libQuery || "").toLowerCase().trim();
    const filteredCat = catalog
      .filter((c) => c.family === state.catalogFamily)
      .filter((c) => !q || [c.name, c.sku, c.category].join(" ").toLowerCase().includes(q));
    const filteredUn = unplaced.filter(
      (d) => !q || [d.name, d.model, d.service_tag, d.role, d.ip].join(" ").toLowerCase().includes(q)
    );
    const placing = !!(state.placeDeviceId || state.placeSku);
    const placeLabel = state.placeSku
      ? catalog.find((c) => c.sku === state.placeSku)?.name || state.placeSku
      : unplaced.find((d) => d.id === state.placeDeviceId)?.name || "";

    el.innerHTML = `
      <div class="rs-backdrop" data-rs-close></div>
      <div class="rs-shell" role="dialog" aria-modal="true" aria-label="Dell Rack Design Studio">
        <header class="rs-head">
          <div class="rs-brand">
            <img src="/dell.png" alt="" height="20" />
            <div>
              <strong>Dell Rack Design Studio</strong>
              <span>${escape(rk.name)} · ${escape(rk.siteName || "")} · Visio design · drag &amp; drop</span>
            </div>
          </div>
          <div class="rs-head-actions">
            <div class="chip-grid">
              ${allRacks.map((r) => `<button type="button" class="chip ${r.id === rk.id ? "active" : ""}" data-rs-rack="${r.id}">${escape(r.name)}</button>`).join("")}
            </div>
            <div class="chip-grid">
              ${["front", "rear"].map((s) => `<button type="button" class="chip ${state.rackSide === s ? "active" : ""}" data-rs-side="${s}">${s}</button>`).join("")}
            </div>
            <div class="rs-zoom">
              <button type="button" class="btn" data-rs-zoom="-">−</button>
              <span>${Math.round(state.studioZoom * 100)}%</span>
              <button type="button" class="btn" data-rs-zoom="+">+</button>
              <button type="button" class="btn" data-rs-zoom="fit">Fit</button>
            </div>
            <button type="button" class="btn ghost" id="rs-close">Close</button>
          </div>
        </header>

        <div class="rs-body">
          <aside class="rs-lib">
            <div class="rs-lib-tabs">
              <button type="button" class="${state.libTab === "catalog" ? "active" : ""}" data-libtab="catalog">Dell products</button>
              <button type="button" class="${state.libTab === "unplaced" ? "active" : ""}" data-libtab="unplaced">OME (${unplaced.length})</button>
            </div>
            <input type="search" id="rs-lib-q" placeholder="Search SKU / model…" value="${escape(state.libQuery || "")}" />
            ${
              state.libTab === "catalog"
                ? `<div class="chip-grid rs-fam">${families
                    .map((f) => `<button type="button" class="chip ${state.catalogFamily === f ? "active" : ""}" data-fam="${escape(f)}">${escape(f)}</button>`)
                    .join("")}</div>
                   <div class="rs-lib-list">${filteredCat
                     .map(
                       (c) => `<div class="rs-stencil ${state.placeSku === c.sku ? "active" : ""}" draggable="true"
                         data-sku="${escape(c.sku)}" data-h="${c.u_height > 0 ? c.u_height : 1}" data-face="${escape(c.face || "")}" data-img="${escape(c.image || "")}" data-name="${escape(c.name)}">
                         <span class="rs-stencil-grip" aria-hidden="true"></span>
                         <span class="rs-prod-face">${productPhoto(c, c.name, { compact: true })}</span>
                         <span class="rs-prod-meta"><strong>${escape(shortModel(c.name))}</strong> ${escape(c.name)}<em>${c.u_height || 0}U · ${escape((c.face || "").replace(/_/g, " "))} · drag</em></span>
                       </div>`
                     )
                     .join("") || '<p class="hint">No products</p>'}</div>`
                : `<div class="rs-lib-list">${filteredUn
                    .map(
                      (d) => `<div class="rs-stencil ${state.placeDeviceId === d.id ? "active" : ""}" draggable="true"
                        data-place="${d.id}" data-h="${d.default_u_height || 1}" data-face="${escape(d.face || "")}" data-img="${escape(d.image || "")}" data-name="${escape(d.name)}" data-sku="${escape(d.catalog_sku || "")}">
                        <span class="rs-stencil-grip" aria-hidden="true"></span>
                        <span class="rs-prod-face">${productPhoto({ face: d.face, image: d.image }, d.name, { compact: true })}</span>
                        <span class="rs-prod-meta"><strong>${escape(d.name)}</strong><em>${escape(d.model || "")} · ${d.default_u_height}U · drag</em></span>
                      </div>`
                    )
                    .join("") || '<p class="hint">All placed</p>'}</div>`
            }
            <p class="rs-lib-hint">Visio-stijl: sleep een product naar een vrije U in het rack</p>
          </aside>

          <main class="rs-canvas-wrap">
            <div class="rs-statusbar">
              <span id="rs-status-text">Sleep stencils uit de bibliotheek naar het rack · drop op een U</span>
              <span class="rs-status-side">${escape((state.rackSide || "front").toUpperCase())} view</span>
            </div>
            <div class="rs-canvas visio" id="rs-canvas">
              <div class="rs-zoom-layer" id="rs-zoom-layer" style="transform:scale(${state.studioZoom}); transform-origin: top center;">
                ${renderStudioRack(rk)}
              </div>
            </div>
            <div id="rs-drag-ghost" class="rs-drag-ghost" hidden></div>
          </main>

          <aside class="rs-insp">
            ${renderStudioInspector(rk)}
          </aside>
        </div>
      </div>
    `;
    el.classList.add("open");
    el.setAttribute("aria-hidden", "false");
    bindStudio(el, catalog, unplaced);
    // scroll so top (U42) is visible; user can scroll full height
    const canvas = $("#rs-canvas", el);
    if (canvas && state.studioScrollTop != null) canvas.scrollTop = state.studioScrollTop;
  }


  function bindStudio(el, catalog, unplaced) {
    const status = () => $("#rs-status-text", el);
    const setStatus = (msg) => {
      if (status()) status().textContent = msg;
    };

    $("#rs-close", el)?.addEventListener("click", closeStudio);
    el.querySelector("[data-rs-close]")?.addEventListener("click", closeStudio);
    el.querySelectorAll("[data-rs-rack]").forEach((btn) =>
      btn.addEventListener("click", () => {
        state.selectedRackId = Number(btn.dataset.rsRack);
        renderStudio();
      })
    );
    el.querySelectorAll("[data-rs-side]").forEach((btn) =>
      btn.addEventListener("click", () => {
        state.rackSide = btn.dataset.rsSide;
        renderStudio();
      })
    );
    el.querySelectorAll("[data-rs-zoom]").forEach((btn) =>
      btn.addEventListener("click", () => {
        const z = btn.dataset.rsZoom;
        if (z === "+") state.studioZoom = Math.min(1.8, (state.studioZoom || 1) + 0.1);
        else if (z === "-") state.studioZoom = Math.max(0.7, (state.studioZoom || 1) - 0.1);
        else state.studioZoom = 1;
        renderStudio();
      })
    );
    el.querySelectorAll("[data-libtab]").forEach((btn) =>
      btn.addEventListener("click", () => {
        state.libTab = btn.dataset.libtab;
        renderStudio();
      })
    );
    el.querySelectorAll("[data-fam]").forEach((btn) =>
      btn.addEventListener("click", () => {
        state.catalogFamily = btn.dataset.fam;
        renderStudio();
      })
    );

    const qEl = $("#rs-lib-q", el);
    qEl?.addEventListener("keydown", (e) => {
      if (e.key === "Enter") {
        state.libQuery = qEl.value;
        renderStudio();
      }
    });
    qEl?.addEventListener("change", () => {
      state.libQuery = qEl.value;
      renderStudio();
    });

    const canvas = $("#rs-canvas", el);
    canvas?.addEventListener("scroll", () => {
      state.studioScrollTop = canvas.scrollTop;
    });

    el.querySelectorAll("[data-item-del]").forEach((btn) =>
      btn.addEventListener("click", async (e) => {
        e.stopPropagation();
        e.preventDefault();
        if (!confirm("Remove from rack?")) return;
        state.racks = await api("DELETE", `/api/racks/items/${Number(btn.dataset.itemDel)}`);
        renderRacks();
        renderStudio();
      })
    );
    el.querySelectorAll("[data-item-sel]").forEach((btn) =>
      btn.addEventListener("click", (e) => {
        if (e.target.closest("[data-item-del]")) return;
        if (state._dragMoved) return;
        state.selectedItemId = Number(btn.dataset.itemSel);
        renderStudio();
      })
    );

    /* ---- Visio-style drag & drop ---- */
    const ghost = $("#rs-drag-ghost", el);
    let dragPayload = null;

    function clearDropHighlight() {
      el.querySelectorAll(".rs-u.drop-over, .rs-u.drop-span, .rs-u.drop-bad").forEach((n) => {
        n.classList.remove("drop-over", "drop-span", "drop-bad");
      });
    }

    function highlightSpan(uStart, h, ok) {
      clearDropHighlight();
      const span = uSpan(uStart, h);
      for (let u = span.lo; u <= span.hi; u++) {
        const zone = el.querySelector(`.rs-u.empty[data-u="${u}"]`);
        if (!zone) continue;
        zone.classList.add(ok ? "drop-span" : "drop-bad");
        if (u === uStart) zone.classList.add("drop-over");
      }
      el.classList.add("rs-dragging");
      return span;
    }

    function parseDrag(raw) {
      try {
        return JSON.parse(raw);
      } catch {
        return null;
      }
    }

    function resolveHeight(payload) {
      if (!payload) return state.placeH || 1;
      if (payload.sku) return catalogHeight(payload.sku, payload.u_height || 1);
      return Math.max(1, Number(payload.u_height) || state.placeH || 1);
    }

    function stencilDragStart(node, e) {
      const sku = node.dataset.sku || null;
      const deviceId = node.dataset.place ? Number(node.dataset.place) : null;
      const h = Number(node.dataset.h || 1);
      const catHit = (sku && catalog.find((c) => c.sku === sku)) || null;
      const unHit = deviceId ? unplaced.find((d) => d.id === deviceId) : null;
      const name = node.dataset.name || catHit?.name || unHit?.name || "Device";
      const face = node.dataset.face || catHit?.face || unHit?.face || "server_1u";
      const image = node.dataset.img || catHit?.image || unHit?.image || "";
      const uHeight = sku
        ? catalogHeight(sku, h)
        : h > 0
          ? h
          : catHit?.u_height > 0
            ? catHit.u_height
            : 1;
      dragPayload = {
        kind: "stencil",
        sku: sku || null,
        device_id: deviceId,
        u_height: uHeight,
        name,
        image,
        face,
      };
      state.placeSku = sku || null;
      state.placeDeviceId = deviceId;
      state.placeH = dragPayload.u_height;
      e.dataTransfer.effectAllowed = "copy";
      const raw = JSON.stringify(dragPayload);
      e.dataTransfer.setData("application/x-rack-item", raw);
      e.dataTransfer.setData("text/plain", raw);
      if (ghost) {
        ghost.hidden = false;
        const code = shortModel(name);
        ghost.innerHTML = `${productPhoto({ face, image }, name, { compact: true })}
          <span class="rs-ghost-meta">
            <span class="rs-ghost-code">${escape(code)}</span>
            <strong>${escape(name)}</strong>
            <span>${uHeight}U · ${escape(face.replace(/_/g, " "))}</span>
          </span>`;
        try {
          e.dataTransfer.setDragImage(ghost, 48, 24);
        } catch (_) {}
      }
      el.classList.add("rs-dragging");
      setStatus(`Sleep ${name} (${uHeight}U) — drop op de onderkant-U (belegt omhoog)`);
      node.classList.add("dragging");
    }

    function itemDragStart(node, e) {
      if (e.target.closest("[data-item-del]")) {
        e.preventDefault();
        return;
      }
      state._dragMoved = false;
      const h = Math.max(1, Number(node.dataset.h || 1));
      dragPayload = {
        kind: "move",
        item_id: Number(node.dataset.itemId),
        u_height: h,
        name: node.querySelector(".rs-u-plate strong")?.textContent || node.querySelector("strong")?.textContent || "Device",
      };
      e.dataTransfer.effectAllowed = "move";
      const raw = JSON.stringify(dragPayload);
      e.dataTransfer.setData("application/x-rack-item", raw);
      e.dataTransfer.setData("text/plain", raw);
      el.classList.add("rs-dragging");
      setStatus(`Verplaatsen (${h}U): drop op nieuwe onderkant-U`);
      node.classList.add("dragging");
    }

    el.querySelectorAll(".rs-stencil").forEach((node) => {
      node.addEventListener("dragstart", (e) => stencilDragStart(node, e));
      node.addEventListener("dragend", () => {
        node.classList.remove("dragging");
        clearDropHighlight();
        el.classList.remove("rs-dragging");
        if (ghost) ghost.hidden = true;
        dragPayload = null;
        setStatus("Sleep stencils uit de bibliotheek naar het rack · drop op onderkant-U");
      });
      // click still selects for keyboard users
      node.addEventListener("click", () => {
        if (node.dataset.sku) {
          state.placeSku = node.dataset.sku;
          state.placeDeviceId = null;
          state.placeH = Number(node.dataset.h || 1);
        } else if (node.dataset.place) {
          state.placeDeviceId = Number(node.dataset.place);
          state.placeSku = node.dataset.sku || null;
          state.placeH = Number(node.dataset.h || 1);
        }
        setStatus(`Geselecteerd: ${node.dataset.name} — sleep of klik een U`);
        el.querySelectorAll(".rs-stencil").forEach((n) => n.classList.toggle("active", n === node));
      });
    });

    el.querySelectorAll(".rs-u.filled").forEach((node) => {
      node.addEventListener("dragstart", (e) => itemDragStart(node, e));
      node.addEventListener("dragend", () => {
        node.classList.remove("dragging");
        clearDropHighlight();
        el.classList.remove("rs-dragging");
        dragPayload = null;
        setTimeout(() => {
          state._dragMoved = false;
        }, 0);
      });
    });

    el.querySelectorAll("[data-drop-u]").forEach((zone) => {
      zone.addEventListener("dragover", (e) => {
        e.preventDefault();
        const rk = focusRack();
        const u = Number(zone.dataset.u);
        const h = resolveHeight(dragPayload);
        const exclude = dragPayload?.kind === "move" ? dragPayload.item_id : null;
        const ok = unitsFree(rk, u, h, exclude);
        e.dataTransfer.dropEffect = ok ? (dragPayload?.kind === "move" ? "move" : "copy") : "none";
        const span = highlightSpan(u, h, ok);
        if (ok) {
          setStatus(`Drop → ${span.label} (${span.height}U)`);
        } else {
          setStatus(`Past niet op ${span.label} — overlap of buiten U1–U${rk?.units || 42}`);
        }
      });
      zone.addEventListener("dragleave", (e) => {
        if (!zone.contains(e.relatedTarget)) {
          zone.classList.remove("drop-over", "drop-span", "drop-bad");
        }
      });
      zone.addEventListener("drop", async (e) => {
        e.preventDefault();
        e.stopPropagation();
        const raw =
          e.dataTransfer.getData("application/x-rack-item") ||
          e.dataTransfer.getData("text/plain");
        const payload = parseDrag(raw) || dragPayload;
        clearDropHighlight();
        el.classList.remove("rs-dragging");
        if (!payload) return;
        const u = Number(zone.dataset.u);
        const h = resolveHeight(payload);
        const rk = focusRack();
        const exclude = payload.kind === "move" ? payload.item_id : null;
        if (!unitsFree(rk, u, h, exclude)) {
          setStatus("Drop geblokkeerd — U-bereik niet vrij");
          return;
        }
        state._dragMoved = true;
        try {
          if (payload.kind === "move" && payload.item_id) {
            state.racks = await api("PATCH", `/api/racks/items/${payload.item_id}`, {
              u_start: u,
              u_height: h,
              side: state.rackSide || "front",
            });
          } else {
            state.placeSku = payload.sku || null;
            state.placeDeviceId = payload.device_id || null;
            state.placeH = h;
            state.placeU = u;
            state.racks = await api("POST", "/api/racks/items", {
              rack_id: state.selectedRackId,
              u_start: u,
              u_height: h,
              side: state.rackSide || "front",
              device_id: payload.device_id || null,
              catalog_sku: payload.sku || null,
            });
            state.placeSku = null;
            state.placeDeviceId = null;
          }
          renderRacks();
          renderStudio();
          setStatus(`Geplaatst op ${uSpan(u, h).label}`);
        } catch (err) {
          alert("Drop failed: " + err.message);
          setStatus("Drop mislukt — probeer een vrije U");
        }
      });
    });

    // click-to-place still works when stencil preselected
    el.querySelectorAll(".rs-u.empty").forEach((node) => {
      node.addEventListener("click", () => {
        if (!state.placeDeviceId && !state.placeSku) return;
        const u = Number(node.dataset.u);
        const h = state.placeSku ? catalogHeight(state.placeSku, state.placeH || 1) : Math.max(1, state.placeH || 1);
        const rk = focusRack();
        if (!unitsFree(rk, u, h, null)) {
          setStatus(`Past niet op ${uSpan(u, h).label}`);
          return;
        }
        state.placeU = u;
        state.placeH = h;
        placeCurrent(true);
      });
      node.addEventListener("mouseenter", () => {
        if (!state.placeDeviceId && !state.placeSku) return;
        if (dragPayload) return;
        const u = Number(node.dataset.u);
        const h = state.placeSku ? catalogHeight(state.placeSku, state.placeH || 1) : Math.max(1, state.placeH || 1);
        const rk = focusRack();
        const ok = unitsFree(rk, u, h, null);
        highlightSpan(u, h, ok);
        setStatus(ok ? `Klik → ${uSpan(u, h).label}` : `Past niet op ${uSpan(u, h).label}`);
      });
      node.addEventListener("mouseleave", () => {
        if (!dragPayload) clearDropHighlight();
      });
    });

    if (el._onKey) document.removeEventListener("keydown", el._onKey);
    el._onKey = (ev) => {
      if (ev.key === "Escape") closeStudio();
    };
    document.addEventListener("keydown", el._onKey);
  }

  async function placeCurrent(fromStudio) {
    if (!state.selectedRackId) return;
    const uStart = Number(state.placeU || 1);
    const height = state.placeSku
      ? catalogHeight(state.placeSku, state.placeH || 1)
      : Math.max(1, Number(state.placeH || 1));
    const side = state.rackSide || "front";
    const rk = focusRack();
    if (!unitsFree(rk, uStart, height, null)) {
      alert(`Past niet op ${uSpan(uStart, height).label}`);
      return;
    }
    try {
      state.racks = await api("POST", "/api/racks/items", {
        rack_id: state.selectedRackId,
        u_start: uStart,
        u_height: height,
        side,
        device_id: state.placeDeviceId || null,
        catalog_sku: state.placeSku || null,
      });
      state.placeDeviceId = null;
      state.placeSku = null;
      renderRacks();
      if (state.studioOpen) renderStudio();
    } catch (err) {
      alert("Place failed: " + err.message);
    }
  }

  function renderStudioRack(rk) {
    const units = rk.units || 42;
    const side = state.rackSide || "front";
    const items = (rk.items || []).filter((it) => (it.side || "front") === side);
    const sideItems = (rk.items || []).filter((it) => it.side === "left" || it.side === "right");
    const occ = new Array(units + 1).fill(null);
    items.forEach((p) => {
      for (let u = p.u_start; u < p.u_start + p.u_height && u <= units; u++) occ[u] = p;
    });
    const rows = [];
    for (let u = units; u >= 1; u--) {
      const p = occ[u];
      const isStart = p && p.u_start === u;
      if (p && !isStart) continue;
      if (p && isStart) {
        const hU = Math.max(1, Number(p.u_height) || 1);
        const h = hU * U_STUDIO;
        const rc = roleClass(roleOf(p));
        const selected = state.selectedItemId === (p.id || p.item_id);
        const uLo = p.u_start;
        const uHi = p.u_start + hU - 1;
        /* Rail labels: high U at top (rack reads top→bottom) */
        const uMarks =
          hU === 1
            ? `<span class="rs-u-num">U${String(uLo).padStart(2, "0")}</span>`
            : `<span class="rs-u-nums" title="U${uLo}–U${uHi} (${hU}U)">
                ${Array.from({ length: hU }, (_, i) => {
                  const uu = uHi - i;
                  return `<span class="rs-u-num">U${String(uu).padStart(2, "0")}</span>`;
                }).join("")}
               </span>`;
        rows.push(`<div class="rs-u filled role-${rc} ${selected ? "sel" : ""}" draggable="true"
          data-u="${u}" data-item-sel="${p.id || p.item_id}" data-item-id="${p.id || p.item_id}"
          data-h="${hU}" style="height:${h}px" title="U${uLo}–U${uHi} · Drag to move · click to select">
          ${uMarks}
          ${facePlate(p)}
          <button type="button" class="rs-u-x" data-item-del="${p.id || p.item_id}" title="Remove">×</button>
        </div>`);
      } else {
        rows.push(`<div class="rs-u empty drop-zone" data-u="${u}" data-drop-u="1" style="height:${U_STUDIO}px">
          <span class="rs-u-num">U${String(u).padStart(2, "0")}</span>
          <span class="rs-u-ghost">drop</span>
        </div>`);
      }
    }
    const fill = rackFillPct(rk);
    return `<div class="rs-cabinet">
      <div class="rs-cab-head">
        <div>
          <strong>${escape(rk.name)}</strong>
          <span>${side} · ${fill.used}U used · ${fill.free}U free · scroll for all 42U</span>
        </div>
        <div class="rs-side-pdu">${
          sideItems.map((s) => `<span>${escape(s.side)}: ${escape(s.label || s.catalog?.name || "PDU")}</span>`).join("") ||
          "<span class='muted'>No side PDUs — place 0U PDU on left/right</span>"
        }</div>
      </div>
      <div class="rs-frame">
        <div class="rs-rail" aria-hidden="true"></div>
        <div class="rs-stack">${rows.join("")}</div>
        <div class="rs-rail" aria-hidden="true"></div>
      </div>
    </div>`;
  }

  function renderStudioInspector(rk) {
    const side = state.rackSide || "front";
    const items = [...(rk.items || [])]
      .filter((it) => (it.side || "front") === side)
      .sort((a, b) => b.u_start - a.u_start);
    const fill = rackFillPct(rk);
    const sel = items.find((i) => (i.id || i.item_id) === state.selectedItemId);
    return `
      <div class="rs-insp-head">
        <strong>${escape(rk.name)}</strong>
        <span>${items.length} items · ${fill.pct}% full</span>
      </div>
      <div class="rd-fillbar"><i style="width:${fill.pct}%"></i></div>
      ${
        sel
          ? `<div class="rd-insp-card">
              <h4>Selected</h4>
              <strong>${escape(sel.label || "")}</strong>
              <p>${escape(sel.catalog?.name || sel.device?.model || "")}</p>
              <p class="mono">${uSpan(sel.u_start, sel.u_height).label} · ${escape(sel.side || "front")}</p>
              ${sel.device?.service_tag ? `<p class="mono">ST ${escape(sel.device.service_tag)}</p>` : ""}
              ${sel.device?.ip ? `<p class="mono">${escape(sel.device.ip)}</p>` : ""}
              <button type="button" class="btn" data-item-del="${sel.id || sel.item_id}" style="margin-top:0.4rem">Remove</button>
            </div>`
          : `<p class="hint">Select a device in the rack for details</p>`
      }
      <h4 class="rd-insp-list-h">Rack contents (U42 → U1)</h4>
      <div class="rd-insp-list">
        ${
          items
            .map(
              (it) => `<button type="button" class="rd-insp-row ${state.selectedItemId === (it.id || it.item_id) ? "active" : ""}" data-item-sel="${it.id || it.item_id}">
                <span class="rd-lib-swatch role-${roleClass(roleOf(it))}"></span>
                <span><strong>${uSpan(it.u_start, it.u_height).label}</strong> ${escape(it.label || "")}</span>
              </button>`
            )
            .join("") || '<p class="hint">Empty — pick from Dell products</p>'
        }
      </div>
    `;
  }

  /* ===== VLANs ===== */
  function renderVlans() {
    const root = $("#network-vlans");
    if (!root || !state.vlans) return;
    const vlans = state.vlans.vlans || [];
    if (state.selectedVlanId == null && vlans[0]) state.selectedVlanId = vlans[0].id;
    const sel = vlans.find((v) => v.id === state.selectedVlanId) || vlans[0];

    root.innerHTML = `
      <div class="vlan-layout">
        <aside class="vlan-list-pane">
          <h4>VLAN / subnet catalog</h4>
          <p class="hint">${escape(state.vlans.note || "")}</p>
          <div class="vlan-cards">
            ${vlans
              .map((v) => {
                const active = v.id === state.selectedVlanId ? " active" : "";
                return `<button type="button" class="vlan-card${active}" data-vlan="${v.id}" style="--vlan:${escape(v.color || "#00a8e8")}">
                  <span class="vlan-id">VLAN ${v.vlan_id ?? "—"}</span>
                  <strong>${escape(v.name)}</strong>
                  <span class="mono">${escape(v.cidr)}</span>
                  <span>${v.member_count} endpoints · ${v.connected_count} connected</span>
                </button>`;
              })
              .join("")}
          </div>
          ${(state.vlans.discovered_subnets || []).length
            ? `<h4>Discovered (not in catalog)</h4>
               <ul class="vlan-discovered">
                 ${(state.vlans.discovered_subnets || [])
                   .map((d) => `<li><span class="mono">${escape(d.cidr)}</span> · ${d.device_ips} IPs</li>`)
                   .join("")}
               </ul>`
            : ""}
        </aside>
        <section class="vlan-detail-pane">
          ${
            sel
              ? `<header class="vlan-detail-head" style="border-color:${escape(sel.color || "#00a8e8")}">
                   <div>
                     <h3>VLAN ${sel.vlan_id ?? "—"} · ${escape(sel.name)}</h3>
                     <p class="mono">${escape(sel.cidr)} · ${escape(sel.site_id || "—")} · ${escape(sel.purpose || "")}</p>
                   </div>
                   <span class="vlan-stat">${sel.member_count} members</span>
                 </header>
                 <div class="vlan-members">
                   ${(sel.members || [])
                     .map(
                       (m) => `<div class="vlan-member ${m.connected ? "up" : "down"}">
                         <strong>${escape(m.name)}</strong>
                         <span class="mono">ST=${escape(m.service_tag || "—")} · ${escape(m.role || "")} · ${(m.ips || []).join(", ")}</span>
                       </div>`
                     )
                     .join("") || '<p class="hint">No live members matched this CIDR.</p>'}
                 </div>`
              : '<p class="hint">No VLANs</p>'
          }
        </section>
      </div>
    `;

    root.querySelectorAll("[data-vlan]").forEach((btn) => {
      btn.addEventListener("click", () => {
        state.selectedVlanId = Number(btn.dataset.vlan);
        renderVlans();
      });
    });
  }

  function bind() {
    $("#btn-network")?.addEventListener("click", openNetwork);
    $("#btn-network-close")?.addEventListener("click", closeNetwork);
    $("#network-tabs")?.addEventListener("click", (e) => {
      const chip = e.target.closest("[data-ntab]");
      if (!chip) return;
      showTab(chip.dataset.ntab);
    });
    $("#scrim")?.addEventListener("click", () => {
      if ($("#scrim")?.dataset.mode === "network-drawer") closeNetwork();
    });
    window.addEventListener("resize", () => {
      if (state.tab === "fabric") drawCables();
    });
  }

  bind();
  window.cockpitNetwork = { open: openNetwork, close: closeNetwork, refresh };
})();