const state = {
  connected: false,
  connecting: false,
  currentPath: "",
  entries: [],
  localPath: "",
  localEntries: [],
  localSelected: new Set(),
  remoteSelected: new Set(),
  remoteFocus: "",
  localFocus: "",
  localSort: { key: "name", dir: 1 },
  remoteSort: { key: "name", dir: 1 },
  remoteStartPath: "",
  remoteReceivePath: "",
};

const ROOTS_PATH = "__roots__";

const $ = (id) => document.getElementById(id);

function cableModelLabel(device) {
  if (!device) return "JUC";
  const m = device.model;
  if (m === "JUC500" || m === "JUC700" || m === "SmartKMLink") return m;
  const vid = device.vid ? parseInt(device.vid, 16) : 0;
  const pid = device.pid ? parseInt(device.pid, 16) : 0;
  if (vid === 0x0ea0 && pid === 0x7301) return "SmartKMLink";
  if (pid === 0x7500) return "JUC500";
  if (pid >= 0x7000 && pid <= 0x700f) return "JUC700";
  return "Smart Data Link";
}

function activeCableFromStatus(s) {
  if (s.active_cable?.model || s.active_cable?.pid) return s.active_cable;
  if (s.device?.model || s.device?.pid) return s.device;
  if (s.devices?.length === 1) return s.devices[0];
  return null;
}

function brandCableLabel(s) {
  if (s.connected && s.cable_model) return s.cable_model;
  const active = activeCableFromStatus(s);
  if (active) return cableModelLabel(active);
  if (s.devices?.length) return cableModelLabel(s.devices[0]);
  const avail = (s.available_cable_models || []).map((m) => String(m).toUpperCase());
  if (avail.length === 1) return avail[0];
  const selected = String(s.selected_cable_model || "").toUpperCase().replace(/\s+/g, "");
  if (selected && avail.includes(selected)) return selected;
  // No USB device yet — show user preference (JUC700 default on Mac).
  if (selected === "JUC500" || selected === "JUC700" || selected === "SMARTKMLINK") {
    return selected === "SMARTKMLINK" ? "SmartKMLink" : selected;
  }
  if (avail.length) return avail[0];
  return "JUC";
}

function hasCableDetected(s) {
  return !!(
    s.connected ||
    s.listening ||
    s.cable_model ||
    s.device?.model ||
    s.device?.pid ||
    s.device?.serial ||
    s.cable_ip ||
    s.devices?.length
  );
}

function cableCaption(s) {
  const active = activeCableFromStatus(s);
  const model = s.connected && s.cable_model
    ? s.cable_model
    : cableModelLabel(active);
  const serial = active?.serial || s.device?.serial || s.cable_ip;
  return serial ? `${model} · ${serial}` : model;
}

const ICON_FOLDER = `<svg class="item-icon folder" viewBox="0 0 24 24" aria-hidden="true"><path fill="currentColor" d="M10 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2h-8l-2-2z"/></svg>`;
const ICON_FILE = `<svg class="item-icon file" viewBox="0 0 24 24" aria-hidden="true"><path fill="currentColor" d="M14 2H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V8l-6-6zm1 7V3.5L18.5 9H15z"/></svg>`;
const ICON_DRIVE = `<svg class="item-icon folder" viewBox="0 0 24 24" aria-hidden="true"><path fill="currentColor" d="M4 6h16a2 2 0 0 1 2 2v7a2 2 0 0 1-2 2h-3.5l-1 2h-5l-1-2H4a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2zm0 2v7h16V8H4z"/></svg>`;

function normPath(path) {
  return String(path || "").replace(/\\/g, "/");
}

function isRootsPath(path) {
  return normPath(path) === ROOTS_PATH;
}

function isAbsPath(path) {
  const p = normPath(path);
  return p.startsWith("/") || /^[A-Za-z]:/i.test(p);
}

function joinPath(base, name) {
  const b = normPath(base).replace(/\/+$/, "");
  if (!b || isRootsPath(b)) return name;
  if (/^[A-Za-z]:$/i.test(b)) return `${b}/${name}`;
  return `${b}/${name}`;
}

function entryNavPath(base, entry) {
  if (entry && entry.nav_path) return normPath(entry.nav_path);
  return joinPath(base, entry.name);
}

/** Parent directory; drive roots and / go up to computer (__roots__). */
function parentPath(path) {
  const raw = normPath(path);
  if (!raw || isRootsPath(raw)) return null;
  // Windows drive root → computer
  if (/^[A-Za-z]:\/?$/i.test(raw) || /^[A-Za-z]:$/i.test(raw.replace(/\/+$/, ""))) {
    return ROOTS_PATH;
  }
  let p = raw.replace(/\/+$/, "");
  // Unix filesystem root
  if (raw === "/" || p === "") return ROOTS_PATH;
  const idx = p.lastIndexOf("/");
  if (idx < 0) return ROOTS_PATH;
  // "/Users" → "/"
  if (idx === 0) return "/";
  // "C:/Users" → "C:/"
  if (idx === 2 && p[1] === ":") return p.slice(0, 3);
  return p.slice(0, idx);
}

function canGoParent(path) {
  return parentPath(path) !== null;
}

function appendParentRow(tbody, { canGo, onGo }) {
  const tr = document.createElement("tr");
  tr.className = canGo ? "parent-row" : "parent-row parent-row-root";
  tr.dataset.isdir = "1";
  tr.dataset.parent = "1";
  tr.innerHTML = `
    <td class="col-name"><div class="name-cell">${ICON_FOLDER}<span>..</span></div></td>
    <td class="col-date muted">—</td>
    <td class="col-size muted">—</td>
    <td class="col-kind kind">상위 폴더</td>
  `;
  tr.title = canGo ? "상위 폴더로 이동" : "최상위 폴더입니다";
  const go = (ev) => {
    ev.preventDefault();
    ev.stopPropagation();
    if (!canGo) {
      setStatus("이미 최상위 폴더입니다");
      return;
    }
    onGo();
  };
  tr.onclick = go;
  tr.ondblclick = go;
  // 맨 위 고정
  tbody.insertBefore(tr, tbody.firstChild);
}

function displayPath(p) {
  const s = normPath(p);
  if (!s) return "/";
  if (isRootsPath(s)) return "이 PC";
  return s;
}

function breadcrumbParts(path) {
  const p = normPath(path);
  if (isRootsPath(p)) return [{ label: "이 PC", path: ROOTS_PATH }];
  if (!p) return [{ label: "홈", path: "" }];
  const crumbs = [{ label: "이 PC", path: ROOTS_PATH }];
  if (/^[A-Za-z]:/i.test(p)) {
    const drive = p.slice(0, 2).toUpperCase() + "/";
    crumbs.push({ label: p.slice(0, 2).toUpperCase(), path: drive });
    const rest = p.replace(/^[A-Za-z]:\/?/i, "").split("/").filter(Boolean);
    let acc = drive.replace(/\/$/, "");
    for (const part of rest) {
      acc = `${acc}/${part}`;
      crumbs.push({ label: part, path: acc });
    }
    return crumbs;
  }
  crumbs.push({ label: "/", path: "/" });
  const parts = p.replace(/^\/+/, "").split("/").filter(Boolean);
  let acc = "";
  for (const part of parts) {
    acc = acc ? `${acc}/${part}` : `/${part}`;
    crumbs.push({ label: part, path: acc });
  }
  return crumbs;
}

function renderPathBar(el, path, onNavigate) {
  el.innerHTML = "";
  breadcrumbParts(path).forEach((c, idx) => {
    if (idx > 0) {
      const sep = document.createElement("span");
      sep.className = "path-sep";
      sep.textContent = "›";
      el.appendChild(sep);
    }
    const btn = document.createElement("button");
    btn.type = "button";
    btn.className = "path-crumb";
    btn.textContent = c.label;
    btn.title = displayPath(c.path);
    btn.onclick = () => onNavigate(c.path);
    el.appendChild(btn);
  });
}

function human(n) {
  const units = ["B", "KB", "MB", "GB", "TB"];
  let f = Number(n) || 0;
  for (const u of units) {
    if (f < 1024 || u === "TB") {
      return u === "B" ? `${Math.round(f)}B` : `${f.toFixed(1)} ${u}`;
    }
    f /= 1024;
  }
  return `${n}B`;
}

function formatMtime(ts) {
  if (!ts) return "—";
  const d = new Date(Number(ts) * (Number(ts) < 1e12 ? 1000 : 1));
  if (Number.isNaN(d.getTime())) return "—";
  const y = d.getFullYear();
  const m = String(d.getMonth() + 1).padStart(2, "0");
  const day = String(d.getDate()).padStart(2, "0");
  const hh = String(d.getHours()).padStart(2, "0");
  const mm = String(d.getMinutes()).padStart(2, "0");
  return `${y}. ${m}. ${day}. ${hh}:${mm}`;
}

function fileKind(name, isDir, kind) {
  if (kind === "drive" || kind === "volume") return "드라이브";
  if (kind === "home") return "홈";
  if (isDir) return "폴더";
  const ext = String(name).includes(".") ? String(name).split(".").pop().toLowerCase() : "";
  const map = {
    png: "PNG 이미지",
    jpg: "JPEG 이미지",
    jpeg: "JPEG 이미지",
    gif: "GIF 이미지",
    webp: "이미지",
    pdf: "PDF 문서",
    txt: "텍스트",
    md: "Markdown",
    json: "JSON",
    js: "JavaScript",
    ts: "TypeScript",
    py: "Python",
    zip: "ZIP 아카이브",
    dmg: "디스크 이미지",
    app: "응용 프로그램",
  };
  if (!ext) return "문서";
  return map[ext] || `${ext.toUpperCase()} 파일`;
}

function setStatus(text, isError = false) {
  const el = $("statusText");
  el.textContent = text;
  el.classList.toggle("error", !!isError);
}

let settingsPortsCache = [];

function openSettingsModal() {
  const modal = $("settingsModal");
  if (!modal) return;
  modal.classList.remove("hidden");
  loadSettingsPorts();
}

function closeSettingsModal() {
  const modal = $("settingsModal");
  if (!modal) return;
  modal.classList.add("hidden");
  const msg = $("settingsMsg");
  if (msg) {
    msg.hidden = true;
    msg.textContent = "";
  }
}

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

function renderPortsForm(ports) {
  const form = $("portsForm");
  if (!form) return;
  form.innerHTML = "";
  settingsPortsCache = ports || [];
  for (const p of settingsPortsCache) {
    const row = document.createElement("div");
    row.className = "port-row";
    row.innerHTML = `
      <div class="port-meta">
        <span class="port-label">${escapeHtml(p.label)}</span>
        <span class="port-desc">${escapeHtml(p.description || "")}</span>
        <span class="port-proto">${escapeHtml(p.protocol)} · 기본 ${p.default}</span>
      </div>
      <input class="port-input" type="number" min="1" max="65535" step="1"
        data-port-key="${escapeHtml(p.key)}" value="${Number(p.value)}" />
    `;
    form.appendChild(row);
  }
}

function collectPortsFromForm() {
  const out = {};
  document.querySelectorAll("[data-port-key]").forEach((input) => {
    out[input.getAttribute("data-port-key")] = Number(input.value);
  });
  return out;
}

async function loadSettingsPorts() {
  const msg = $("settingsMsg");
  try {
    const data = await api("/api/settings/ports");
    renderPortsForm(data.ports || []);
    const pathEl = $("portsConfigPath");
    if (pathEl) {
      pathEl.textContent = data.config_path ? `설정 파일: ${data.config_path}` : "";
    }
    if (msg) {
      msg.hidden = true;
      msg.textContent = "";
    }
  } catch (e) {
    if (msg) {
      msg.hidden = false;
      msg.className = "settings-msg error";
      msg.textContent = e.message || String(e);
    }
  }
}

async function waitForGui(url, tries = 40) {
  const base = url.replace(/\/?$/, "/");
  for (let i = 0; i < tries; i++) {
    try {
      const res = await fetch(base + "api/status", { cache: "no-store" });
      if (res.ok) return true;
    } catch {
      /* waiting */
    }
    await new Promise((r) => setTimeout(r, 400));
  }
  return false;
}

async function applyPortsAndRestart() {
  const msg = $("settingsMsg");
  const btn = $("portsApplyBtn");
  const ports = collectPortsFromForm();
  if (btn) btn.disabled = true;
  if (msg) {
    msg.hidden = false;
    msg.className = "settings-msg";
    msg.textContent = "적용 중… 서비스를 재시작합니다";
  }
  try {
    const data = await api("/api/settings/ports", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ ports, restart: true }),
    });
    const redirect = data.redirect || `http://127.0.0.1:${data.gui_port || ports.gui}/`;
    if (msg) msg.textContent = data.message || "재시작 완료 대기 중…";
    const ok = await waitForGui(redirect);
    if (ok) {
      window.location.replace(redirect);
      return;
    }
    if (msg) {
      msg.className = "settings-msg error";
      msg.textContent = "재시작 대기가 지연됩니다. 잠시 후 " + redirect + " 로 접속하세요.";
    }
  } catch (e) {
    if (msg) {
      msg.hidden = false;
      msg.className = "settings-msg error";
      msg.textContent = e.message || String(e);
    }
  } finally {
    if (btn) btn.disabled = false;
  }
}

function bindSettingsUi() {
  const openBtn = $("settingsBtn");
  if (openBtn) openBtn.onclick = () => openSettingsModal();
  document.querySelectorAll("[data-close-settings]").forEach((el) => {
    el.addEventListener("click", () => closeSettingsModal());
  });
  const resetBtn = $("portsResetBtn");
  if (resetBtn) {
    resetBtn.onclick = () => {
      for (const p of settingsPortsCache) {
        const input = document.querySelector(`[data-port-key="${p.key}"]`);
        if (input) input.value = p.default;
      }
    };
  }
  const applyBtn = $("portsApplyBtn");
  if (applyBtn) applyBtn.onclick = () => applyPortsAndRestart();
}

async function quitApp() {
  setStatus("입력공유 끄고 종료 중…");
  try {
    await api("/api/inputshare/enable", {
      method: "POST",
      body: JSON.stringify({ enabled: false }),
    }).catch(() => {});
  } catch (_) {}
  try {
    await api("/api/quit", { method: "POST" });
  } catch (_) {}
}

function updatePathHints() {
  const local = displayPath(state.localPath);
  const remote = displayPath(state.currentPath);
  if ($("localPathHint")) $("localPathHint").textContent = local;
  if ($("remotePathHint")) $("remotePathHint").textContent = remote;
  if ($("railLocalPath")) $("railLocalPath").textContent = local;
  if ($("railRemotePath")) $("railRemotePath").textContent = remote;
}

function updatePasteBadge(info) {
  const badge = $("pasteBadge");
  if (!badge) return;
  if (!state.connected) {
    badge.textContent = "붙여넣기 —";
    badge.className = "auto-badge wait";
    badge.title = "연결 후 Finder/Explorer에서 복사 → 상대 폴더에서 Ctrl+Shift+V";
    return;
  }
  const count = info && typeof info.count === "number" ? info.count : 0;
  const dest = (info && info.paste_dest) || state.currentPath || "";
  const destLabel = dest
    ? dest.split("/").filter(Boolean).slice(-2).join("/") || dest
    : "(폴더 미선택)";
  if (info && info.sending) {
    badge.textContent = "붙여넣기 전송 중…";
    badge.className = "auto-badge wait";
  } else if (count > 0) {
    badge.textContent = `붙여넣기 ${count}개 → ${destLabel}`;
    badge.className = "auto-badge ok";
  } else {
    badge.textContent = `붙여넣기 → ${destLabel}`;
    badge.className = "auto-badge wait";
  }
  const names = (info && info.names) || [];
  badge.title = [
    dest ? `대상: ${dest}` : "상대 폴더를 UI에서 연 뒤 붙여넣으세요",
    count ? `클립보드: ${names.join(", ")}${info.truncated ? "…" : ""}` : "클립보드에 파일 없음",
    "Ctrl+Shift+V (파일 → 상대 폴더)",
  ].join("\n");
}

async function syncPasteDest(path) {
  const dest = normPath(path || "");
  if (!state.connected || !dest || isRootsPath(dest)) return;
  try {
    await api("/api/paste-dest", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ path: dest }),
    });
  } catch (_) {
    /* ignore */
  }
}

async function sendClipboardToRemote() {
  if (!state.connected) {
    setStatus("먼저 연결하세요", true);
    return;
  }
  const dest = remoteUploadDest();
  if (!dest) {
    setStatus("상대 폴더를 연 뒤 붙여넣으세요 (이 PC → 상대)", true);
    return;
  }
  await syncPasteDest(dest);
  setStatus(`클립보드 → ${displayPath(dest)} 전송 중…`);
  try {
    const info = await api("/api/clipboard/send", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({}),
    });
    if (info.ok === false) {
      setStatus(info.error || "클립보드 전송 실패", true);
      updatePasteBadge(info);
      return;
    }
    setStatus(
      `클립보드 ${info.count || "?"}개 → ${displayPath(info.dest_dir || dest)} 전송 시작`
    );
    // Poll progress briefly
    for (let i = 0; i < 120; i++) {
      await new Promise((r) => setTimeout(r, 500));
      const s = await refreshStatus();
      const clip = s.clipboard || {};
      updatePasteBadge(clip);
      if (!clip.sending) {
        if (clip.error) setStatus(`클립보드 전송 실패: ${clip.error}`, true);
        else {
          setStatus("클립보드 파일 전송 완료");
          try {
            await loadDir(state.currentPath);
          } catch (_) {}
        }
        break;
      }
    }
  } catch (e) {
    setStatus(e.message || "클립보드 전송 실패", true);
  }
}

function remoteUploadDest(explicit) {
  if (explicit != null && explicit !== undefined) return explicit;
  const cur = state.currentPath || state.remoteReceivePath || state.remoteStartPath || "";
  return isRootsPath(cur) ? "" : cur;
}

function updateInputShareUI(info) {
  const badge = $("inputBadge");
  const btn = $("inputShareBtn");
  const localBtn = $("controlLocalBtn");
  const remoteBtn = $("controlRemoteBtn");
  if (!badge || !btn) return;
  btn.hidden = false;
  btn.style.display = "";
  // 수신 측(being_controlled)도 버튼 활성 — 제어권 회수/탈취
  const linkOk = !!(
    state.connected ||
    (info && (info.peer || info.being_controlled || info.primary_ready))
  );
  const shareActive = !!(
    info &&
    info.enabled &&
    linkOk &&
    (info.trusted || info.being_controlled)
  );
  const controlReady = shareActive;
    if (localBtn && remoteBtn) {
    localBtn.disabled = !controlReady;
    remoteBtn.disabled = !controlReady;
    const remote = !!(info && info.controlling_remote && info.remote_acked);
    const pending = !!(info && info.controlling_remote && !info.remote_acked);
    const controlled = !!(info && info.being_controlled);
    localBtn.classList.toggle("active", controlReady && !remote && !controlled && !pending);
    remoteBtn.classList.toggle("active", controlReady && (remote || pending));
    localBtn.title = controlled
      ? "이 PC 제어 회수 (상대 조종 해제)"
      : "이 PC 제어 — 상대 제어 중 왼쪽 끝으로 복귀";
    remoteBtn.title = pending
      ? "상대 응답 대기 중…"
      : controlled
        ? "상대 PC 제어 가져오기 (제어권 탈취)"
        : "상대 PC 제어 — 이후 화면 오른쪽 끝으로도 전환";
    const sw = localBtn.closest(".control-switch");
    if (sw) sw.title = controlReady ? "제어권 전환" : "입력공유를 먼저 켜세요";
  }
  if (!info || !info.supported) {
    badge.textContent = "입력공유 미지원";
    badge.className = "auto-badge wait";
    btn.disabled = true;
    btn.textContent = "입력공유";
    return;
  }

  // OFF first — never replace the enable button with accessibility helper text
  if (!info.enabled && !info.being_controlled) {
    badge.textContent = linkOk ? "입력공유 꺼짐" : "입력공유 꺼짐 (연결 후 켜기)";
    badge.className = "auto-badge wait";
    badge.title =
      "USB 연결 시 입력공유가 기본 켜짐 — 한쪽에서 끄면 상대도 자동으로 꺼집니다";
    btn.disabled = !linkOk;
    btn.textContent = "입력공유 켜기";
    return;
  }

  btn.disabled = !linkOk;
  if (!info.trusted && !info.being_controlled) {
    const win = info.platform === "windows";
    badge.textContent = win ? "입력 권한 확인 필요" : "손쉬운 사용 권한 필요";
    badge.className = "auto-badge wait";
    const pick = info.pick_path || info.python_app || info.executable || "";
    const pickName = pick.split("/").pop() || "앱";
    badge.title =
      info.howto ||
      (pick
        ? `선택할 항목: ${pickName}\n전체 경로: ${pick}\n(Finder는 상위 폴더를 열고 ${pickName} 을 선택합니다)`
        : win
          ? "입력공유를 다시 켜 보세요"
          : "시스템 설정 → 손쉬운 사용");
    btn.textContent = "입력공유 켜기";
    return;
  }
  if (info.being_controlled) {
    badge.textContent = "상대가 조종 중 — [이 PC]/[상대 PC]로 회수";
    badge.className = "auto-badge wait";
    badge.title = "이 PC: 조종 해제 / 상대 PC: 제어권 가져오기";
    btn.textContent = "입력공유 끄기";
  } else if (info.enabled && info.peer && info.controlling_remote && !info.remote_acked) {
    badge.textContent = "상대 응답 대기…";
    badge.className = "auto-badge wait";
    badge.title = "상대 PC 응답 대기 중 (입력공유는 자동 동기화됨)";
    btn.textContent = "입력공유 끄기";
  } else if (info.enabled && info.peer) {
    badge.textContent = info.controlling_remote ? "제어: 상대 PC" : "제어: 이 PC";
    badge.className = "auto-badge ok";
    badge.title = "가장자리 전환: 오른쪽→상대, 왼쪽→이 PC · Esc 종료 · Ctrl+Shift+U/←/→";
    btn.textContent = "입력공유 끄기";
  } else if (info.enabled) {
    badge.textContent = info.status || "입력공유 대기";
    badge.className = "auto-badge wait";
    btn.textContent = "입력공유 끄기";
  } else {
    badge.textContent = "입력공유 꺼짐";
    badge.className = "auto-badge wait";
    btn.textContent = "입력공유 켜기";
  }
}

async function switchInputControl(target) {
  try {
    const res = await fetch("/api/inputshare/control", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ target }),
    });
    const info = await res.json().catch(() => ({}));
    updateInputShareUI(info);
    if (!res.ok || info.ok === false) {
      setStatus(info.error || "제어권 전환 실패", true);
      return;
    }
    if (info.controlling_remote && !info.remote_acked) {
      setStatus("상대 응답 대기 중…");
    } else if (info.controlling_remote) {
      setStatus("키보드·마우스 제어: 상대 PC (왼쪽 끝 또는 [이 PC]로 복귀)");
    } else if (info.being_controlled) {
      setStatus("상대가 이 PC를 조종 중 — [이 PC]로 회수");
    } else {
      setStatus("키보드·마우스 제어: 이 PC (오른쪽 끝 또는 [상대 PC]로 전환)");
    }
  } catch (e) {
    setStatus(e.message, true);
  }
}

function updateTransferButtons() {
  const canUp = state.connected && state.localSelected.size > 0;
  const canDown = state.connected && state.remoteSelected.size > 0;
  if ($("uploadBtn")) $("uploadBtn").disabled = !canUp;
  if ($("downloadBtn")) $("downloadBtn").disabled = !canDown;
}

function escapeHtml(s) {
  return String(s)
    .replaceAll("&", "&amp;")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;");
}

async function api(path, options = {}) {
  const res = await fetch(path, options);
  const data = await res.json().catch(() => ({}));
  if (!res.ok) {
    const err = new Error(data.error || res.statusText || "요청 실패");
    err.code = data.code || "";
    err.status = res.status;
    throw err;
  }
  return data;
}

function updateBadge(connected, text) {
  const badge = $("autoBadge");
  badge.textContent = text;
  badge.className = connected ? "auto-badge ok" : "auto-badge wait";
}

function updateWormholeUI(info) {
  const badge = $("wormholeBadge");
  const btn = $("killWormholeBtn");
  if (!badge) return;
  if (!info) {
    badge.textContent = "Wormhole —";
    badge.className = "auto-badge wait";
    return;
  }
  if (info.running) {
    badge.textContent = `Wormhole ${info.count}개 실행중`;
    badge.className = "auto-badge wait";
    badge.title = (info.processes || [])
      .map((p) => `${p.name} (${p.pid})`)
      .join("\n") || info.message || "";
    if (btn) btn.disabled = false;
  } else {
    badge.textContent = "Wormhole 없음";
    badge.className = "auto-badge ok";
    badge.title = info.message || "공식 Wormhole 프로세스 없음";
    if (btn) btn.disabled = false;
  }
}

async function killWormhole() {
  setStatus("공식 Wormhole 종료 중…");
  try {
    const data = await api("/api/wormhole/kill", { method: "POST" });
    updateWormholeUI({
      running: (data.remaining || []).length > 0,
      count: (data.remaining || []).length,
      processes: data.remaining || [],
      message: data.message,
    });
    setStatus(data.message || "Wormhole 종료 완료");
    await refreshStatus();
  } catch (e) {
    setStatus(e.message || String(e), true);
  }
}

function sortEntries(entries, sort) {
  const dir = sort.dir;
  const key = sort.key;
  return [...entries].sort((a, b) => {
    if (a.is_dir !== b.is_dir) return a.is_dir ? -1 : 1;
    let av;
    let bv;
    if (key === "size") {
      av = a.is_dir ? -1 : Number(a.size) || 0;
      bv = b.is_dir ? -1 : Number(b.size) || 0;
    } else if (key === "mtime") {
      av = Number(a.mtime) || 0;
      bv = Number(b.mtime) || 0;
    } else if (key === "kind") {
      av = fileKind(a.name, a.is_dir);
      bv = fileKind(b.name, b.is_dir);
    } else {
      av = String(a.name || "").toLowerCase();
      bv = String(b.name || "").toLowerCase();
    }
    if (av < bv) return -1 * dir;
    if (av > bv) return 1 * dir;
    return String(a.name).localeCompare(String(b.name), "ko");
  });
}

function updateSortButtons(prefix, sort) {
  document.querySelectorAll(`[data-sort-${prefix}]`).forEach((btn) => {
    const k = btn.getAttribute(`data-sort-${prefix}`);
    if (!btn.dataset.label) btn.dataset.label = btn.textContent.replace(/ [▲▼]$/, "");
    btn.classList.toggle("active", k === sort.key);
    btn.textContent =
      k === sort.key ? `${btn.dataset.label} ${sort.dir > 0 ? "▲" : "▼"}` : btn.dataset.label;
  });
}

function updateCableSwitchUI(s) {
  const selected = (s.selected_cable_model || "JUC500").toUpperCase().replace(/\s+/g, "");
  const b500 = $("cableJuc500Btn");
  const b700 = $("cableJuc700Btn");
  const bKm = $("cableKmLinkBtn");
  const sw = document.querySelector(".cable-switch");
  if (!b500 || !b700) return;
  const available = (s.available_cable_models || []).map((m) => String(m));
  const availU = available.map((m) => m.toUpperCase().replace(/\s+/g, ""));
  const detected = availU.length > 0;
  // When nothing is plugged in, keep JUC500/JUC700 as preference toggles.
  const show500 = detected ? availU.includes("JUC500") : true;
  const show700 = detected ? availU.includes("JUC700") : true;
  const showKm = detected && availU.includes("SMARTKMLINK");
  const visible = [show500, show700, showKm].filter(Boolean).length;
  b500.classList.toggle("cable-hidden", !show500);
  b700.classList.toggle("cable-hidden", !show700);
  if (bKm) bKm.classList.toggle("cable-hidden", !showKm);
  if (sw) sw.classList.toggle("cable-single", visible === 1);
  const sel = selected === "SMARTKMLINK" || selected === "KMLINK" ? "SMARTKMLINK" : selected;
  b500.classList.toggle("active", sel === "JUC500");
  b700.classList.toggle("active", sel === "JUC700");
  if (bKm) bKm.classList.toggle("active", sel === "SMARTKMLINK");
  const busy = !!(s.connecting || state.connecting);
  b500.disabled = busy || (detected && !show500);
  b700.disabled = busy || (detected && !show700);
  if (bKm) bKm.disabled = busy || (detected && !showKm);
  state.availableCableModels = available;
}

async function selectCableModel(model) {
  if (state.connecting) return;
  const available = (state.availableCableModels || []).map((m) =>
    String(m).toUpperCase().replace(/\s+/g, "")
  );
  const modelKey = String(model).toUpperCase().replace(/\s+/g, "");
  if (available.length && !available.includes(modelKey)) return;
  const prev = (state.selectedCableModel || "").toUpperCase();
  if (prev === model && state.connected) {
    setStatus(`${model} — 이미 연결됨`);
    return;
  }
  state.connecting = true;
  setStatus(`${model} 케이블로 전환 중…`);
  try {
    await api("/api/cable/select", { method: "POST", body: JSON.stringify({ model }) });
    const deadline = Date.now() + 70000;
    let s = await refreshStatus();
    while (Date.now() < deadline) {
      if (s.connected) {
        setStatus(`${model} 연결됨`);
        return;
      }
      if (s.connect_error && !s.connecting) {
        throw new Error(s.connect_error);
      }
      if (!s.connecting && !s.connected && (s.listening || s.connect_error)) {
        if (s.connect_error) throw new Error(s.connect_error);
        break;
      }
      await new Promise((r) => setTimeout(r, 500));
      s = await refreshStatus();
    }
    if (!s.connected) {
      throw new Error(s.connect_error || s.auto_status || "케이블 전환 시간 초과");
    }
  } catch (e) {
    setStatus(e.message, true);
    await refreshStatus();
  } finally {
    state.connecting = false;
  }
}

function formatBuildTag(build) {
  const raw = String(build || "").trim();
  if (!raw || raw === "unknown") return "?";
  return raw.replace(/^20\d{2}-\d{2}-\d{2}-/, "");
}

function formatAppVersion(status) {
  const ver = String(status?.version || "0.1.0").trim() || "0.1.0";
  const xfer = formatBuildTag(status?.xfer_build);
  return `v${ver} · ${xfer}`;
}

function updateAppVersionUI(s) {
  const el = $("appVersion");
  if (!el) return;
  const label = formatAppVersion(s);
  el.textContent = label;
  const inputshare = formatBuildTag(s?.inputshare_build);
  const xfer = formatBuildTag(s?.xfer_build);
  el.title = `앱 v${s?.version || "?"} · xfer ${xfer} · inputshare ${inputshare}`;
}

async function refreshStatus() {
  const s = await api("/api/status");
  state.connected = !!s.connected;
  state.listening = !!s.listening;
  state.selectedCableModel = s.selected_cable_model || "";
  if (s.connecting) state.connecting = true;
  else if (s.connected || s.connect_error) state.connecting = false;
  $("disconnectBtn").disabled = !state.connected;
  const canConnect = hasCableDetected(s) || !!s.listening;
  $("connectBtn").disabled =
    state.connected || state.connecting || !!s.connecting || !canConnect;
  if ($("connectBtn")) {
    $("connectBtn").title = canConnect
      ? "상대 PC와 USB 연결"
      : "JUC500/JUC700 케이블을 Mac USB에 연결한 뒤 사용";
  }
  updateTransferButtons();
  $("mkdirBtn").disabled = !state.connected;

  const active = activeCableFromStatus(s);
  const model = s.connected && s.cable_model
    ? s.cable_model
    : cableModelLabel(active);
  const hasCable = hasCableDetected(s);
  const brand = brandCableLabel(s);
  if ($("brandModel")) {
    $("brandModel").textContent = brand;
    const vid = active?.vid || s.device?.vid || "?";
    const pid = active?.pid || s.device?.pid || "?";
    $("brandModel").title = hasCable
      ? `${brand} (${vid}:${pid})${s.connected ? " — 연결됨" : " — 자동 감지"}`
      : `${brand} — USB 미감지 (JUC500/JUC700 버튼으로 모델 선택)`;
  }
  if (document.title !== brand) {
    document.title = brand;
  }
  updateAppVersionUI(s);
  if (s.this_host) $("thisHost").textContent = `${s.this_host} · ${cableCaption(s)}`;
  if (s.local_root) $("localRootHint").textContent = s.local_root;

  updateInputShareUI(s.inputshare);
  updatePasteBadge(s.clipboard);
  updateWormholeUI(s.wormhole);
  updateCableSwitchUI(s);

  if (state.connected) {
    updateBadge(true, "연결됨");
    $("peerInfo").textContent = s.hostname || s.host || "상대 PC";
    if (s.devices?.length > 1) {
      const activeTag = s.cable_model ? `${s.cable_model} 연결` : model;
      const list = s.devices.map((d) => `${d.model}·IF${d.if_num ?? "?"}`).join(" / ");
      $("ifaceInfo").textContent = `${activeTag} — ${list}`;
    } else if (active?.serial) {
      $("ifaceInfo").textContent = `${model} · IF${active.if_num ?? s.device?.if_num ?? "?"} · ${active.serial}`;
    } else if (active?.model || active?.pid) {
      $("ifaceInfo").textContent = `${model} · IF${active.if_num ?? s.device?.if_num ?? "?"}`;
    } else {
      $("ifaceInfo").textContent = `${model} bulk bridge`;
    }
    $("remoteRootHint").textContent = s.root || s.host || "연결됨";
    if (s.remote_start != null) state.remoteStartPath = s.remote_start || "";
    if (s.remote_receive != null) state.remoteReceivePath = s.remote_receive || state.remoteStartPath;
  } else if (s.connecting || state.connecting) {
    updateBadge(false, "연결 중");
    const role = s.usb_role === "connector" ? "Mac → Windows" : "연결";
    $("peerInfo").textContent =
      s.auto_status || `${role} HELLO 송신 중…`;
    $("ifaceInfo").textContent = hasCable
      ? `${model} · IF${active?.if_num ?? s.device?.if_num ?? "?"} · connector`
      : "";
    $("remoteRootHint").textContent = "연결 시도 중";
  } else if (s.handshake) {
    updateBadge(false, "동기화 중");
    $("peerInfo").textContent =
      s.auto_status || "상대 연결 감지 — 자동 동기화 중…";
  } else if (s.listening) {
    updateBadge(false, "대기 중");
    $("peerInfo").textContent =
      s.auto_status || "케이블 대기 — Mac이 곧 Windows로 연결 시도";
  } else {
    updateBadge(false, hasCable ? "케이블 감지됨" : "케이블 대기");
    $("peerInfo").textContent =
      s.auto_status ||
      (hasCable
        ? "상대가 실행되면 Mac이 자동으로 연결 시도"
        : `${model}(Smart Data Link) 케이블을 연결하세요`);
  }
  if (!state.connected && !(s.connecting || state.connecting)) {
    $("ifaceInfo").textContent = hasCable
      ? (s.devices?.length > 1
          ? s.devices.map((d) => `${d.model}·IF${d.if_num ?? "?"}`).join(" / ")
          : `${model} · IF${active?.if_num ?? s.device?.if_num ?? "?"}${active?.serial ? ` · ${active.serial}` : ""}`)
      : "";
    if (!s.listening && !s.handshake) {
      $("remoteRootHint").textContent = "연결 필요";
    }
  }

  if (s.progress?.busy) {
    const pct = s.progress.total ? Math.round((100 * s.progress.done) / s.progress.total) : 0;
    $("progressBar").style.width = `${pct}%`;
    setStatus(`전송 중 ${pct}% — ${s.progress.label || ""}`);
  }
  return s;
}

async function connectOneClick() {
  if (state.connecting || state.connected) return;
  state.connecting = true;
  $("connectBtn").disabled = true;
  updateBadge(false, "연결 중…");
  setStatus("공식 Wormhole 종료 후 상대 프로그램 대기 중…");
  $("peerInfo").textContent = "Wormhole 정리 · USB 핸드셰이크 중…";

  try {
    const data = await api("/api/connect/auto", { method: "POST" });
    if (data.ok === false || data.code === "PEER_NOT_FOUND") {
      const err = new Error(data.error || "상대 PC를 찾지 못했습니다.");
      err.code = data.code || "PEER_NOT_FOUND";
      throw err;
    }

    // Server connects in background — poll until done (avoids browser aborting 45s POST).
    const deadline = Date.now() + 70000;
    let s = await refreshStatus();
    while (Date.now() < deadline) {
      if (state.connected || (s && s.connected)) break;
      if (s && s.connect_error) {
        const err = new Error(s.connect_error);
        err.code = /연결되지 않았습니다|PEER|상대/.test(s.connect_error)
          ? "PEER_NOT_FOUND"
          : "CONNECT_FAILED";
        throw err;
      }
      if (s && !s.connecting && !s.connected) {
        // connect thread finished without success and without error yet — brief settle
        await new Promise((r) => setTimeout(r, 300));
        s = await refreshStatus();
        if (!s.connected && (s.connect_error || !s.connecting)) {
          const err = new Error(
            s.connect_error ||
              s.auto_status ||
              "연결 실패 — 상대 Windows에서 JUC500 GUI 「연결」을 누르세요"
          );
          err.code = "PEER_NOT_FOUND";
          throw err;
        }
      }
      if (s && s.auto_status) setStatus(s.auto_status);
      await new Promise((r) => setTimeout(r, 500));
      s = await refreshStatus();
    }

    if (!state.connected && !(s && s.connected)) {
      const err = new Error(
        "상대 응답 시간 초과 — Windows에서 같은 JUC500 앱을 실행하고 「연결」을 누르세요"
      );
      err.code = "PEER_NOT_FOUND";
      throw err;
    }

    await api("/api/auto/start", { method: "POST" }).catch(() => {});
    state.connected = true;
    state.connecting = false;
    updateBadge(true, "연결됨");
    setStatus("연결됨 — 상대 폴더를 불러오는 중…");
    $("peerInfo").textContent =
      (s && (s.hostname || s.host)) || data.hostname || data.host || "상대 PC";
    $("disconnectBtn").disabled = false;
    $("connectBtn").disabled = true;

    state.currentPath = "";
    state.remoteStartPath = (s && s.remote_start) || data.start_path || "";
    state.remoteReceivePath =
      (s && s.remote_receive) || data.receive_path || data.start_path || "";
    updatePathHints();
    await new Promise((r) => setTimeout(r, 1200));
    try {
      await loadDir(state.remoteStartPath || "");
      setStatus("연결 완료 — .. 또는 ↑ 로 상대 PC 루트까지 이동할 수 있습니다");
    } catch (listErr) {
      const msg = (listErr && listErr.message) || "상대 폴더 목록을 받지 못했습니다";
      setStatus(msg + " — 새로고침을 눌러 다시 시도하세요", true);
      showRemoteMessage(msg + "\n\n상단 새로고침(↻)으로 다시 불러올 수 있습니다.", true);
      updateTransferButtons();
    }
  } catch (e) {
    state.connecting = false;
    state.connected = false;
    updateBadge(false, "미연결");
    $("connectBtn").disabled = false;
    $("disconnectBtn").disabled = true;
    const msg = (e && e.message) || "연결 실패";
    setStatus(msg, true);
    $("peerInfo").textContent =
      e.code === "PEER_NOT_FOUND"
        ? "상대 없음 — 양쪽 JUC500 GUI 실행·케이블·WinUSB(Zadig)를 확인하세요"
        : "연결 실패 — 다시 연결을 누르세요";
    showRemoteMessage(msg, true);
  }
}

function showRemoteMessage(msg, isError = false) {
  const tbody = $("dirList");
  tbody.innerHTML = "";
  $("remoteEmpty").classList.add("hidden");
  $("remoteCount").textContent = "—";
  const tr = document.createElement("tr");
  tr.innerHTML = `<td colspan="4" style="padding:24px;color:${isError ? "var(--danger)" : "var(--muted)"};white-space:pre-wrap">${escapeHtml(msg)}</td>`;
  tbody.appendChild(tr);
}

async function disconnect() {
  await api("/api/disconnect", { method: "POST" });
  state.connected = false;
  state.connecting = false;
  state.entries = [];
  state.remoteFocus = "";
  showRemoteMessage("연결 후 여기에 상대 폴더가 표시됩니다");
  $("remoteEmpty").textContent = "연결 후 여기에 상대 폴더가 표시됩니다";
  $("remoteEmpty").classList.remove("hidden");
  $("dirList").innerHTML = "";
  renderPathBar($("pathBar"), "", () => {});
  $("upBtn").disabled = true;
  $("mkdirBtn").disabled = true;
  updatePathHints();
  await refreshStatus();
  setStatus("연결 해제됨 — 케이블 연결 시 자동 재연결됩니다");
}

async function loadDir(path) {
  if (!state.connected) {
    setStatus("먼저 연결 버튼을 누르세요", true);
    return;
  }
  const rel = normPath(path);
  const data = await api(`/api/listdir?path=${encodeURIComponent(rel)}`);
  state.currentPath = normPath(data.path || rel || "");
  state.entries = data.entries || [];
  state.remoteFocus = "";
  state.remoteSelected.clear();
  await syncPasteDest(state.currentPath);
  renderPathBar($("pathBar"), state.currentPath, (p) => {
    loadDir(p).catch((err) => setStatus(err.message, true));
  });
  renderRemote();
  updatePathHints();
  updateTransferButtons();
  $("upBtn").disabled = !canGoParent(state.currentPath);
}

function renderRemote() {
  const tbody = $("dirList");
  tbody.innerHTML = "";
  updateSortButtons("remote", state.remoteSort);
  const entries = sortEntries(state.entries, state.remoteSort);
  $("remoteCount").textContent =
    state.remoteSelected.size > 0
      ? `${state.remoteSelected.size}개 선택됨 / ${entries.length}개 항목`
      : `${entries.length}개 항목`;

  if (!entries.length) {
    $("remoteEmpty").textContent = state.connected
      ? "폴더가 비어 있습니다"
      : "연결 후 여기에 상대 폴더가 표시됩니다";
    $("remoteEmpty").classList.toggle("hidden", !!state.connected && !!state.currentPath);
    if (!state.connected) {
      $("remoteEmpty").classList.remove("hidden");
      return;
    }
    appendParentRow(tbody, {
      canGo: canGoParent(state.currentPath),
      onGo: () => goUp().catch((err) => setStatus(err.message, true)),
    });
    if (state.currentPath) $("remoteEmpty").classList.add("hidden");
    else $("remoteEmpty").classList.remove("hidden");
    return;
  }
  $("remoteEmpty").classList.add("hidden");

  entries.forEach((e) => {
    const full = entryNavPath(state.currentPath, e);
    const tr = document.createElement("tr");
    tr.dataset.path = full;
    tr.dataset.isdir = e.is_dir ? "1" : "0";
    tr.draggable = !isRootsPath(state.currentPath);
    if (e.is_dir) tr.dataset.dropPath = full;
    if (state.remoteSelected.has(full) || state.remoteFocus === full) {
      tr.classList.add("selected");
    }
    const icon =
      e.kind === "drive" || e.kind === "volume" || e.kind === "home"
        ? ICON_DRIVE
        : e.is_dir
          ? ICON_FOLDER
          : ICON_FILE;
    tr.innerHTML = `
      <td class="col-name"><div class="name-cell">${icon}<span>${escapeHtml(e.name)}</span></div></td>
      <td class="col-date muted">${formatMtime(e.mtime)}</td>
      <td class="col-size muted">${e.is_dir ? "—" : human(e.size)}</td>
      <td class="col-kind kind">${escapeHtml(fileKind(e.name, e.is_dir, e.kind))}</td>
    `;
    tr.onclick = (ev) => {
      state.remoteFocus = full;
      if (ev.metaKey || ev.ctrlKey) {
        if (state.remoteSelected.has(full)) state.remoteSelected.delete(full);
        else state.remoteSelected.add(full);
      } else {
        state.remoteSelected.clear();
        state.remoteSelected.add(full);
      }
      tbody.querySelectorAll("tr").forEach((x) => {
        x.classList.toggle("selected", state.remoteSelected.has(x.dataset.path));
      });
      $("remoteCount").textContent = `${state.remoteSelected.size}개 선택됨 / ${entries.length}개 항목`;
      updateTransferButtons();
    };
    tr.ondblclick = () => {
      if (e.is_dir) loadDir(full).catch((err) => setStatus(err.message, true));
    };
    tr.addEventListener("dragstart", (ev) => {
      if (!state.remoteSelected.has(full)) {
        state.remoteSelected.clear();
        state.remoteSelected.add(full);
        tbody.querySelectorAll("tr").forEach((x) => {
          x.classList.toggle("selected", state.remoteSelected.has(x.dataset.path));
        });
      }
      ev.dataTransfer.setData(
        "application/x-fileshare-remote",
        JSON.stringify([...state.remoteSelected])
      );
      ev.dataTransfer.effectAllowed = "copy";
      tr.classList.add("dragging");
    });
    tr.addEventListener("dragend", () => tr.classList.remove("dragging"));
    tbody.appendChild(tr);
  });
  appendParentRow(tbody, {
    canGo: canGoParent(state.currentPath),
    onGo: () => goUp().catch((err) => setStatus(err.message, true)),
  });
}

async function loadLocal(path) {
  const rel = normPath(path);
  const data = await api(`/api/local/listdir?path=${encodeURIComponent(rel)}`);
  state.localPath = normPath(data.path || rel || "");
  state.localEntries = data.entries || [];
  state.localSelected.clear();
  state.localFocus = "";
  renderPathBar($("localPathBar"), state.localPath, (p) => {
    loadLocal(p).catch((err) => setStatus(err.message, true));
  });
  $("localUpBtn").disabled = !canGoParent(state.localPath);
  updatePathHints();
  updateTransferButtons();
  renderLocal();
}

function renderLocal() {
  const tbody = $("localDirList");
  tbody.innerHTML = "";
  updateSortButtons("local", state.localSort);
  const entries = sortEntries(state.localEntries, state.localSort);
  $("localCount").textContent = `${entries.length}개 항목`;

  if (!entries.length) {
    $("localEmpty").classList.remove("hidden");
    appendParentRow(tbody, {
      canGo: canGoParent(state.localPath),
      onGo: () => localGoUp().catch((err) => setStatus(err.message, true)),
    });
    if (state.localPath) $("localEmpty").classList.add("hidden");
    return;
  }
  $("localEmpty").classList.add("hidden");

  entries.forEach((e) => {
    const full = entryNavPath(state.localPath, e);
    const tr = document.createElement("tr");
    tr.dataset.path = full;
    tr.dataset.isdir = e.is_dir ? "1" : "0";
    tr.draggable = !isRootsPath(state.localPath);
    if (e.is_dir) tr.dataset.dropPath = full;
    if (state.localSelected.has(full) || state.localFocus === full) {
      tr.classList.add(e.is_dir ? "selected" : "checked");
    }
    const icon =
      e.kind === "drive" || e.kind === "volume" || e.kind === "home"
        ? ICON_DRIVE
        : e.is_dir
          ? ICON_FOLDER
          : ICON_FILE;
    tr.innerHTML = `
      <td class="col-name"><div class="name-cell">${icon}<span>${escapeHtml(e.name)}</span></div></td>
      <td class="col-date muted">${formatMtime(e.mtime)}</td>
      <td class="col-size muted">${e.is_dir ? "—" : human(e.size)}</td>
      <td class="col-kind kind">${escapeHtml(fileKind(e.name, e.is_dir, e.kind))}</td>
    `;
    tr.onclick = (ev) => {
      state.localFocus = full;
      if (e.is_dir) {
        if (ev.metaKey || ev.ctrlKey) {
          if (state.localSelected.has(full)) state.localSelected.delete(full);
          else state.localSelected.add(full);
        } else {
          state.localSelected.clear();
          state.localSelected.add(full);
        }
        tbody.querySelectorAll("tr").forEach((x) => {
          x.classList.toggle("checked", state.localSelected.has(x.dataset.path));
          x.classList.toggle("selected", state.localSelected.has(x.dataset.path) && x.dataset.isdir === "1");
        });
        $("localCount").textContent =
          state.localSelected.size > 0
            ? `${state.localSelected.size}개 선택됨 / ${entries.length}개 항목`
            : `${entries.length}개 항목`;
        updateTransferButtons();
        return;
      }
      if (ev.metaKey || ev.ctrlKey) {
        if (state.localSelected.has(full)) state.localSelected.delete(full);
        else state.localSelected.add(full);
      } else if (ev.shiftKey && state.localSelected.size) {
        state.localSelected.add(full);
      } else {
        state.localSelected.clear();
        state.localSelected.add(full);
      }
      tbody.querySelectorAll("tr").forEach((x) => {
        x.classList.toggle("checked", state.localSelected.has(x.dataset.path));
        x.classList.remove("selected");
      });
      $("localCount").textContent =
        state.localSelected.size > 0
          ? `${state.localSelected.size}개 선택됨 / ${entries.length}개 항목`
          : `${entries.length}개 항목`;
      updateTransferButtons();
    };
    tr.ondblclick = () => {
      if (e.is_dir) loadLocal(full).catch((err) => setStatus(err.message, true));
    };
    tr.addEventListener("dragstart", (ev) => {
      if (!state.localSelected.has(full)) {
        state.localSelected.clear();
        state.localSelected.add(full);
        tbody.querySelectorAll("tr").forEach((x) => {
          x.classList.toggle("checked", state.localSelected.has(x.dataset.path));
        });
      }
      ev.dataTransfer.setData(
        "application/x-fileshare-local",
        JSON.stringify([...state.localSelected])
      );
      ev.dataTransfer.effectAllowed = "copy";
      tr.classList.add("dragging");
    });
    tr.addEventListener("dragend", () => tr.classList.remove("dragging"));
    tbody.appendChild(tr);
  });
  appendParentRow(tbody, {
    canGo: canGoParent(state.localPath),
    onGo: () => localGoUp().catch((err) => setStatus(err.message, true)),
  });
}

async function goUp() {
  if (!state.connected) {
    setStatus("먼저 연결 버튼을 누르세요", true);
    return;
  }
  const parent = parentPath(state.currentPath);
  if (parent === null) {
    updatePathHints();
    setStatus("이미 최상위 폴더입니다");
    return;
  }
  await loadDir(parent);
}

async function localGoUp() {
  const parent = parentPath(state.localPath);
  if (parent === null) {
    setStatus("이미 최상위 폴더입니다");
    return;
  }
  await loadLocal(parent);
}

async function mkdir() {
  if (!state.connected) return;
  if (isRootsPath(state.currentPath)) {
    setStatus("드라이브 목록에서는 폴더를 만들 수 없습니다. 드라이브를 먼저 여세요", true);
    return;
  }
  const name = prompt("새 폴더 이름");
  if (!name) return;
  const path = joinPath(state.currentPath, name.trim());
  try {
    await api("/api/mkdir", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ path }),
    });
    await loadDir(state.currentPath);
    updatePathHints();
    setStatus(`폴더 생성: ${displayPath(path)}`);
  } catch (e) {
    setStatus(e.message, true);
  }
}

async function watchProgress(run) {
  $("progressBar").style.width = "2%";
  const poll = setInterval(async () => {
    try {
      const p = await api("/api/progress");
      if (p.total) {
        const pct = Math.max(2, Math.round((100 * p.done) / p.total));
        $("progressBar").style.width = `${pct}%`;
        setStatus(`전송 중 ${pct}% — ${p.label || ""}`);
      }
      if (p.error) setStatus(p.error, true);
    } catch (_) {}
  }, 250);
  try {
    await run();
    $("progressBar").style.width = "100%";
  } finally {
    clearInterval(poll);
    setTimeout(() => {
      $("progressBar").style.width = "0%";
    }, 1200);
  }
}

async function uploadFiles(fileList, destDir) {
  if (!state.connected) {
    setStatus("먼저 연결 버튼을 누르세요", true);
    return;
  }
  const files = [...fileList].filter((f) => f && f.size >= 0 && f.name);
  if (!files.length) {
    setStatus("폴더는 OS에서 바로 드롭할 수 없습니다. 파일을 드롭하거나 패널에서 드래그하세요", true);
    return;
  }
  const dest = remoteUploadDest(destDir);
  const fd = new FormData();
  fd.append("dest_dir", dest);
  files.forEach((f) => fd.append("file", f, f.name));
  setStatus(`${files.length}개 파일 → 상대 ${displayPath(dest)} 전송…`);
  await watchProgress(async () => {
    const res = await fetch("/api/upload", { method: "POST", body: fd });
    const data = await res.json();
    if (!res.ok) throw new Error(data.error || "전송 실패");
    setStatus(`${data.count}개 전송 완료 → ${displayPath(data.dest_dir)}`);
    await loadDir(state.currentPath);
  }).catch((e) => setStatus(e.message, true));
}

async function writeLocalFiles(fileList, destDir) {
  const files = [...fileList].filter((f) => f && f.size >= 0 && f.name);
  if (!files.length) {
    setStatus("폴더는 OS에서 바로 드롭할 수 없습니다. 파일을 선택해 드롭하세요", true);
    return;
  }
  const dest = destDir != null ? destDir : state.localPath || "";
  const fd = new FormData();
  fd.append("dest_dir", dest);
  files.forEach((f) => fd.append("file", f, f.name));
  setStatus(`${files.length}개 파일 → 이 PC ${displayPath(dest)} 저장…`);
  try {
    const res = await fetch("/api/local/write", { method: "POST", body: fd });
    const data = await res.json();
    if (!res.ok) throw new Error(data.error || "저장 실패");
    setStatus(`${data.count}개 저장 완료 → ${displayPath(data.dest_dir)}`);
    await loadLocal(state.localPath);
  } catch (e) {
    setStatus(e.message, true);
  }
}

async function sendLocalSelected(destDir) {
  if (!state.connected) {
    setStatus("먼저 연결 버튼을 누르세요", true);
    return;
  }
  const paths = [...state.localSelected];
  if (!paths.length) {
    setStatus("로컬 파일/폴더를 선택하세요", true);
    return;
  }
  const dest = remoteUploadDest(destDir);
  setStatus(`${paths.length}개 → 상대 ${displayPath(dest)} 전송…`);
  await watchProgress(async () => {
    const data = await api("/api/local/send", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ dest_dir: dest, paths }),
    });
    setStatus(`${data.count}개 전송 완료 → ${displayPath(data.dest_dir)}`);
    await loadDir(state.currentPath);
  }).catch((e) => setStatus(e.message, true));
}

async function fetchRemoteSelected(destDir) {
  if (!state.connected) {
    setStatus("먼저 연결 버튼을 누르세요", true);
    return;
  }
  const paths = [...state.remoteSelected];
  if (!paths.length) {
    setStatus("상대 파일/폴더를 선택하세요", true);
    return;
  }
  const dest = destDir != null ? destDir : state.localPath || "";
  setStatus(`${paths.length}개 → 이 PC ${displayPath(dest)} 가져오는 중…`);
  await watchProgress(async () => {
    const data = await api("/api/remote/fetch", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ dest_dir: dest, paths }),
    });
    setStatus(`${data.count}개 가져오기 완료 → ${displayPath(data.dest_dir)}`);
    await loadLocal(state.localPath);
  }).catch((e) => setStatus(e.message, true));
}

function dropDestFromEvent(e, fallbackPath) {
  const row = e.target.closest?.("tr[data-drop-path]");
  if (row?.dataset?.dropPath) return row.dataset.dropPath;
  return fallbackPath || "";
}

function clearDropHighlights() {
  document.querySelectorAll(".finder.drop-target, tr.drop-target").forEach((el) => {
    el.classList.remove("drop-target");
  });
}

function bindPaneDrop(pane, side) {
  const prevent = (e) => {
    e.preventDefault();
    e.stopPropagation();
  };

  const onDragOver = (e) => {
    prevent(e);
    e.dataTransfer.dropEffect = "copy";
    pane.classList.add("drop-target");
    const row = e.target.closest?.("tr[data-drop-path]");
    document.querySelectorAll("tr.drop-target").forEach((r) => r.classList.remove("drop-target"));
    if (row) row.classList.add("drop-target");
  };

  const onDragLeave = (e) => {
    if (!pane.contains(e.relatedTarget)) {
      pane.classList.remove("drop-target");
      pane.querySelectorAll("tr.drop-target").forEach((r) => r.classList.remove("drop-target"));
    }
  };

  const onDrop = async (e) => {
    prevent(e);
    clearDropHighlights();
    const dest = dropDestFromEvent(
      e,
      side === "remote" ? remoteUploadDest() : state.localPath || ""
    );

    const localPayload = e.dataTransfer.getData("application/x-fileshare-local");
    const remotePayload = e.dataTransfer.getData("application/x-fileshare-remote");
    const osFiles = e.dataTransfer?.files;

    try {
      if (side === "remote") {
        if (localPayload) {
          state.localSelected = new Set(JSON.parse(localPayload));
          await sendLocalSelected(dest);
          return;
        }
        if (remotePayload) {
          setStatus("같은 상대 패널 안에서는 이동할 수 없습니다", true);
          return;
        }
        if (osFiles?.length) {
          await uploadFiles(osFiles, dest);
          return;
        }
      } else {
        // local pane
        if (remotePayload) {
          state.remoteSelected = new Set(JSON.parse(remotePayload));
          await fetchRemoteSelected(dest);
          return;
        }
        if (localPayload) {
          setStatus("같은 이 PC 패널 안에서는 이동할 수 없습니다", true);
          return;
        }
        if (osFiles?.length) {
          await writeLocalFiles(osFiles, dest);
          return;
        }
      }
      setStatus("드롭할 파일이 없습니다", true);
    } catch (err) {
      setStatus(err.message || String(err), true);
    }
  };

  ["dragenter", "dragover", "dragleave", "drop"].forEach((ev) => {
    pane.addEventListener(ev, prevent);
  });
  pane.addEventListener("dragover", onDragOver);
  pane.addEventListener("dragleave", onDragLeave);
  pane.addEventListener("drop", onDrop);
}

function bindDrop() {
  bindPaneDrop(document.querySelector(".remote-browser"), "remote");
  bindPaneDrop(document.querySelector(".local-browser"), "local");
}

function bindSort(prefix, getSort, setSort, rerender) {
  document.querySelectorAll(`[data-sort-${prefix}]`).forEach((btn) => {
    btn.onclick = () => {
      const key = btn.getAttribute(`data-sort-${prefix}`);
      const cur = getSort();
      if (cur.key === key) setSort({ key, dir: cur.dir * -1 });
      else setSort({ key, dir: 1 });
      rerender();
    };
  });
}

function bindUi() {
  if ($("cableJuc500Btn")) {
    $("cableJuc500Btn").onclick = () => selectCableModel("JUC500");
  }
  if ($("cableJuc700Btn")) {
    $("cableJuc700Btn").onclick = () => selectCableModel("JUC700");
  }
  if ($("cableKmLinkBtn")) {
    $("cableKmLinkBtn").onclick = () => selectCableModel("SmartKMLink");
  }
  $("connectBtn").onclick = () => connectOneClick();
  $("disconnectBtn").onclick = () => disconnect().catch((e) => setStatus(e.message, true));
  if ($("killWormholeBtn")) {
    $("killWormholeBtn").onclick = () => killWormhole();
  }
  $("upBtn").onclick = () => goUp().catch((e) => setStatus(e.message, true));
  $("refreshBtn").onclick = () => {
    if (!state.connected) {
      setStatus("먼저 연결 버튼을 누르세요", true);
      return;
    }
    loadDir(state.currentPath)
      .then(() => setStatus("상대 폴더 새로고침"))
      .catch((e) => setStatus(e.message, true));
  };
  $("mkdirBtn").onclick = () => mkdir();
  $("localUpBtn").onclick = () => localGoUp().catch((e) => setStatus(e.message, true));
  $("localRefreshBtn").onclick = () =>
    loadLocal(state.localPath)
      .then(() => setStatus("이 PC 폴더 새로고침"))
      .catch((e) => setStatus(e.message, true));

  // FTP 스타일: 선택 → 상대/로컬 현재 폴더로 전송
  $("uploadBtn").onclick = () => sendLocalSelected(remoteUploadDest());
  $("downloadBtn").onclick = () => fetchRemoteSelected(state.localPath || "");
  $("inputShareBtn").onclick = async () => {
    try {
      let cur = await api("/api/inputshare");
      if (!cur.trusted) {
        let prompted;
        try {
          prompted = await api("/api/inputshare/prompt-trust", { method: "POST" });
        } catch (e) {
          prompted = await api("/api/inputshare/prompt-trust").catch(() => null);
          if (!prompted) {
            setStatus("권한 API를 찾을 수 없습니다. 앱을 재시작하세요", true);
            return;
          }
        }
        updateInputShareUI(prompted);
        if (!prompted.trusted) {
          const lines = [];
          if (prompted.message) lines.push(prompted.message);
          else if (prompted.howto) lines.push(prompted.howto);
          setStatus(
            lines.join("\n") || "시스템 설정에서 손쉬운 사용/입력 권한을 허용하세요",
            true
          );
          // macOS: wait until user grants Accessibility
          for (let i = 0; i < 30; i++) {
            await new Promise((r) => setTimeout(r, 1000));
            const again = await api("/api/inputshare/prompt-trust", { method: "POST" }).catch(
              () => null
            );
            if (again && again.trusted) {
              cur = again;
              updateInputShareUI(again);
              setStatus("권한이 허용되었습니다 — 입력공유를 켭니다");
              break;
            }
          }
          if (!cur.trusted) return;
        } else {
          cur = prompted;
        }
      }
      const next = !cur.enabled;
      const info = await api("/api/inputshare/enable", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ enabled: next }),
      });
      updateInputShareUI(info);
      if (info.ok === false) {
        setStatus(info.error || "입력공유 전환 실패", true);
        return;
      }
      if (!next) {
        // Unstick local/peer modifiers & cursor after KM handoff
        await api("/api/inputshare/recover", { method: "POST" }).catch(() => null);
        setStatus("입력공유 꺼짐 — 마우스·키보드 상태 복구함");
      } else {
        setStatus("입력공유 켜짐 — 오른쪽 끝→상대 / 왼쪽 끝·Ctrl+Shift+←→이 PC");
      }
    } catch (e) {
      setStatus(e.message, true);
    }
  };

  if ($("controlLocalBtn")) {
    $("controlLocalBtn").onclick = () => switchInputControl("local");
  }
  if ($("controlRemoteBtn")) {
    $("controlRemoteBtn").onclick = () => switchInputControl("remote");
  }

  bindSettingsUi();

  // UI에서도 동일 단축키 (이 PC 제어 중일 때)
  window.addEventListener("keydown", (ev) => {
    if (ev.key === "Escape") {
      const modal = $("settingsModal");
      if (modal && !modal.classList.contains("hidden")) {
        ev.preventDefault();
        closeSettingsModal();
        return;
      }
      ev.preventDefault();
      quitApp();
      return;
    }
    // Ctrl+Shift+V → clipboard files to remote current folder
    if ((ev.ctrlKey || ev.metaKey) && ev.shiftKey && (ev.key === "v" || ev.key === "V")) {
      if (state.connected) {
        ev.preventDefault();
        sendClipboardToRemote().catch((e) => setStatus(e.message, true));
      }
      return;
    }
    if (!(ev.ctrlKey && ev.shiftKey)) return;
    const localBtn = $("controlLocalBtn");
    if (!localBtn || localBtn.disabled) return;
    if (ev.key === "u" || ev.key === "U") {
      ev.preventDefault();
      const remote = $("controlRemoteBtn")?.classList.contains("active");
      switchInputControl(remote ? "local" : "remote");
    } else if (ev.key === "ArrowLeft") {
      ev.preventDefault();
      switchInputControl("local");
    } else if (ev.key === "ArrowRight") {
      ev.preventDefault();
      switchInputControl("remote");
    }
  });

  bindSort(
    "local",
    () => state.localSort,
    (s) => {
      state.localSort = s;
    },
    () => renderLocal()
  );
  bindSort(
    "remote",
    () => state.remoteSort,
    (s) => {
      state.remoteSort = s;
    },
    () => renderRemote()
  );
  bindDrop();
}

(async function init() {
  bindUi();
  renderPathBar($("localPathBar"), "", (p) => loadLocal(p));
  renderPathBar($("pathBar"), "", () => {});
  try {
    const s = await refreshStatus();
    await loadLocal(s.local_start || "");
    if (state.connected) {
      try {
        await loadDir(state.remoteStartPath || "");
        setStatus("자동 연결됨 — .. 또는 ↑ 로 상대 PC 루트까지 이동할 수 있습니다");
      } catch (listErr) {
        setStatus(
          ((listErr && listErr.message) || "상대 폴더 로드 실패") +
            " — 새로고침을 눌러 다시 시도하세요",
          true
        );
      }
    } else {
      setStatus(s.auto_status || "JUC500 케이블 연결 시 양쪽이 자동 연결됩니다");
    }
  } catch (e) {
    setStatus(e.message, true);
  }

  // 백그라운드 자동 연결을 UI에 반영
  let wasConnected = state.connected;
  setInterval(async () => {
    if (state.connecting) return;
    try {
      const s = await refreshStatus();
      if (!wasConnected && state.connected) {
        try {
          await new Promise((r) => setTimeout(r, 1200));
          await loadDir(state.remoteStartPath || "");
          const s2 = await refreshStatus();
          if (s2.inputshare?.enabled) {
            setStatus("자동 연결됨 — 입력공유 켜짐");
          } else {
            setStatus("자동 연결됨 — 입력공유 권한 확인 후 「입력공유」를 눌러 주세요");
          }
        } catch (listErr) {
          setStatus(
            ((listErr && listErr.message) || "상대 폴더 로드 실패") +
              " — 새로고침을 눌러 다시 시도하세요",
            true
          );
        }
      } else if (!state.connected && s.auto_status) {
        setStatus(s.auto_status);
      }
      wasConnected = state.connected;
    } catch {
      /* ignore */
    }
  }, 700);
})();