(() => {
  "use strict";

  const state = { open: false, returnFocus: null, backgroundInert: [] };

  function setBackgroundInert(inert) {
    const layer = document.querySelector("#firmwareWorkbenchLayer");
    if (!layer) return;
    if (inert) {
      state.backgroundInert = [...document.body.children]
        .filter((element) => element !== layer && !["SCRIPT", "STYLE", "LINK"].includes(element.tagName))
        .map((element) => ({ element, wasInert: element.hasAttribute("inert") }));
      state.backgroundInert.forEach(({ element }) => element.toggleAttribute("inert", true));
      return;
    }
    state.backgroundInert.forEach(({ element, wasInert }) => element.toggleAttribute("inert", wasInert));
    state.backgroundInert = [];
  }

  function setOpen(open) {
    const next = Boolean(open);
    const layer = document.querySelector("#firmwareWorkbenchLayer");
    const trigger = document.querySelector("#firmwareWorkbenchToggle");
    if (!layer || !trigger || state.open === next) return;
    state.open = next;
    trigger.classList.toggle("active", next);
    trigger.setAttribute("aria-pressed", String(next));
    trigger.setAttribute("aria-expanded", String(next));
    trigger.setAttribute("aria-label", next ? "关闭座椅固件开发工作台" : "打开座椅固件开发工作台");
    trigger.title = next ? "关闭座椅固件开发工作台" : "打开座椅固件开发工作台";
    if (next) {
      state.returnFocus = document.activeElement;
      layer.hidden = false;
      layer.inert = false;
      layer.dataset.open = "true";
      setBackgroundInert(true);
      requestAnimationFrame(() => document.querySelector("#firmwareWorkbenchClose")?.focus());
    } else {
      layer.dataset.open = "false";
      layer.inert = true;
      layer.hidden = true;
      setBackgroundInert(false);
      const target = state.returnFocus instanceof HTMLElement && state.returnFocus.isConnected
        ? state.returnFocus
        : trigger;
      state.returnFocus = null;
      target.focus();
    }
  }

  function mount() {
    const dock = document.querySelector("#v2PanelControlDock");
    if (!dock || document.querySelector("#firmwareWorkbenchToggle")) return false;

    const trigger = document.createElement("button");
    trigger.id = "firmwareWorkbenchToggle";
    trigger.className = "firmware-workbench-toggle v2-panel-control-button";
    trigger.type = "button";
    trigger.setAttribute("aria-controls", "firmwareWorkbenchLayer");
    trigger.setAttribute("aria-pressed", "false");
    trigger.setAttribute("aria-expanded", "false");
    trigger.setAttribute("aria-label", "打开座椅固件开发工作台");
    trigger.title = "打开座椅固件开发工作台";
    trigger.innerHTML = '<i data-lucide="blocks"></i><span class="visually-hidden">座椅固件开发工作台</span>';

    const layer = document.createElement("div");
    layer.id = "firmwareWorkbenchLayer";
    layer.className = "firmware-workbench-layer";
    layer.hidden = true;
    layer.inert = true;
    layer.setAttribute("role", "dialog");
    layer.setAttribute("aria-modal", "true");
    layer.setAttribute("aria-labelledby", "firmwareWorkbenchTitle");
    layer.innerHTML = `
      <section class="firmware-workbench-page">
        <header class="firmware-workbench-header">
          <div class="firmware-workbench-heading">
            <span><i data-lucide="blocks"></i></span>
            <h2 id="firmwareWorkbenchTitle">座椅固件开发工作台</h2>
          </div>
          <button id="firmwareWorkbenchClose" type="button" aria-label="关闭座椅固件开发工作台" title="关闭"><i data-lucide="x"></i></button>
        </header>
        <iframe class="firmware-workbench-frame" src="/firmware-workbench.html?embedded=1" title="座椅固件开发工作台"></iframe>
      </section>`;

    dock.append(trigger);
    document.body.append(layer);
    trigger.addEventListener("click", () => setOpen(!state.open));
    document.querySelector("#firmwareWorkbenchClose", layer).addEventListener("click", () => setOpen(false));
    layer.addEventListener("click", (event) => { if (event.target === layer) setOpen(false); });
    document.addEventListener("keydown", (event) => {
      if (state.open && event.key === "Escape") {
        event.preventDefault();
        setOpen(false);
      }
    });
    window.lucide?.createIcons({ attrs: { "aria-hidden": "true" } });
    return true;
  }

  if (!mount()) {
    const observer = new MutationObserver(() => {
      if (mount()) observer.disconnect();
    });
    observer.observe(document.body, { childList: true, subtree: true });
    window.setTimeout(() => observer.disconnect(), 15000);
  }
})();