const $ = (sel) => document.querySelector(sel);
const $$ = (sel) => Array.from(document.querySelectorAll(sel));

const i18n = {
  en: {
    brandSubtitle: "Local Admin",
    navDashboard: "Dashboard",
    navTraffic: "Traffic",
    navKeys: "Keys",
    navBackups: "Backups",
    navLogs: "Logs",
    navSettings: "Settings",
    refresh: "Refresh",
    themeDark: "Dark",
    themeLight: "Light",
    metricMode: "Mode",
    metricKeys: "Keys",
    metricProxyTraffic: "Proxy Traffic",
    metricSiteTraffic: "Site Traffic",
    configuredUsers: "configured users",
    packets: "packets",
    servicesEyebrow: "Services",
    servicesTitle: "Runtime health",
    runtimeEyebrow: "Runtime",
    runtimeTitle: "telemt summary",
    trafficEyebrow: "Traffic",
    trafficTitle: "History",
    keysEyebrow: "Access",
    keysTitle: "User keys",
    backupsEyebrow: "Snapshots",
    backupsTitle: "Backups",
    eventsEyebrow: "Events",
    eventsTitle: "Activity",
    logsEyebrow: "Journal",
    logsTitle: "Logs",
    settingsEyebrow: "Settings",
    settingsTitle: "Panel preferences",
    configEyebrow: "Config",
    configTitle: "Installation state",
    collector: "Collector",
    lastPoint: "Last point",
    historyRows: "History rows",
    collectStats: "Collect",
    repairStats: "Repair stats",
    tableTime: "Time",
    tableProxyDelta: "Proxy delta",
    tableSiteDelta: "Site delta",
    tableProxyTotal: "Proxy total",
    tableSiteTotal: "Site total",
    tableUser: "User",
    tableSecret: "Secret",
    tableLink: "Link",
    tableActions: "Actions",
    userPlaceholder: "client-name",
    addKey: "Add key",
    copyLink: "Copy link",
    copySecret: "Copy secret",
    delete: "Delete",
    main: "main",
    createBackup: "Create backup",
    loadLogs: "Load",
    panelLanguage: "Panel language",
    theme: "Theme",
    bindAddress: "Bind address",
    dashboard: "Dashboard",
    noKeys: "No keys yet",
    noBackups: "No backups yet",
    noEvents: "No events yet",
    noHistory: "No traffic history yet",
    noRuntime: "Runtime data is not available",
    badConnections: "Bad connections",
    connections: "Connections",
    uptime: "Uptime",
    users: "Users",
    revision: "Revision",
    healthOk: "OK",
    healthError: "Error",
    healthStale: "Stale",
    healthStopped: "Stopped",
    healthNotInstalled: "Not installed",
    healthUnknown: "Unknown",
    statusRunning: "running",
    statusInactive: "inactive",
    statusStopped: "stopped",
    statusFailed: "failed",
    statusNotInstalled: "not installed",
    statusActivating: "activating",
    statusDeactivating: "deactivating",
    statusUnknown: "unknown",
    statsMissing: "Collector is not running",
    statsOk: "Collector is running",
    statsStale: "Snapshot is stale",
    statsError: "Collector error",
    restart: "Restart",
    copied: "Copied",
    copyFailed: "Copy failed",
    keyCreated: "Key created",
    keyDeleted: "Key deleted",
    backupCreated: "Backup created",
    serviceRestarted: "Service restarted",
    statsRepaired: "Statistics repaired",
    statsCollected: "Statistics collected",
    confirmDelete: "Delete key",
    confirmRestart: "Restart",
    invalidUser: "Use latin letters, digits, _, . or -",
    loading: "Loading...",
    never: "never",
    lightTheme: "Light",
    darkTheme: "Dark",
    configMode: "Mode",
    configDomain: "Domain",
    configTemplate: "Template",
    configVersion: "Version",
    pageDashboardTitle: "Dashboard",
    pageDashboardKicker: "Local Admin",
    pageTrafficTitle: "Traffic",
    pageTrafficKicker: "Statistics",
    pageKeysTitle: "Keys",
    pageKeysKicker: "Access",
    pageBackupsTitle: "Backups",
    pageBackupsKicker: "Migration",
    pageLogsTitle: "Logs",
    pageLogsKicker: "Journal",
    pageSettingsTitle: "Settings",
    pageSettingsKicker: "Preferences",
  },
  ru: {
    brandSubtitle: "Локальная админка",
    navDashboard: "Обзор",
    navTraffic: "Трафик",
    navKeys: "Ключи",
    navBackups: "Бекапы",
    navLogs: "Логи",
    navSettings: "Настройки",
    refresh: "Обновить",
    themeDark: "Тёмная",
    themeLight: "Светлая",
    metricMode: "Режим",
    metricKeys: "Ключи",
    metricProxyTraffic: "Трафик proxy",
    metricSiteTraffic: "Трафик сайта",
    configuredUsers: "настроенных пользователей",
    packets: "пакетов",
    servicesEyebrow: "Сервисы",
    servicesTitle: "Состояние runtime",
    runtimeEyebrow: "Runtime",
    runtimeTitle: "сводка telemt",
    trafficEyebrow: "Трафик",
    trafficTitle: "История",
    keysEyebrow: "Доступ",
    keysTitle: "Ключи пользователей",
    backupsEyebrow: "Снимки",
    backupsTitle: "Бекапы",
    eventsEyebrow: "События",
    eventsTitle: "Активность",
    logsEyebrow: "Журнал",
    logsTitle: "Логи",
    settingsEyebrow: "Настройки",
    settingsTitle: "Параметры панели",
    configEyebrow: "Конфиг",
    configTitle: "Состояние установки",
    collector: "Сборщик",
    lastPoint: "Последняя точка",
    historyRows: "Строк истории",
    collectStats: "Собрать",
    repairStats: "Починить статистику",
    tableTime: "Время",
    tableProxyDelta: "Proxy delta",
    tableSiteDelta: "Site delta",
    tableProxyTotal: "Proxy всего",
    tableSiteTotal: "Site всего",
    tableUser: "Пользователь",
    tableSecret: "Secret",
    tableLink: "Ссылка",
    tableActions: "Действия",
    userPlaceholder: "client-name",
    addKey: "Добавить ключ",
    copyLink: "Копировать ссылку",
    copySecret: "Копировать secret",
    delete: "Удалить",
    main: "основной",
    createBackup: "Создать бекап",
    loadLogs: "Загрузить",
    panelLanguage: "Язык панели",
    theme: "Тема",
    bindAddress: "Адрес bind",
    dashboard: "Обзор",
    noKeys: "Ключей пока нет",
    noBackups: "Бекапов пока нет",
    noEvents: "Событий пока нет",
    noHistory: "Истории трафика пока нет",
    noRuntime: "Runtime-данные недоступны",
    badConnections: "Ошибочные подключения",
    connections: "Подключения",
    uptime: "Аптайм",
    users: "Пользователи",
    revision: "Ревизия",
    healthOk: "OK",
    healthError: "Ошибка",
    healthStale: "Устарело",
    healthStopped: "Остановлено",
    healthNotInstalled: "Не установлен",
    healthUnknown: "Неизвестно",
    statusRunning: "работает",
    statusInactive: "неактивен",
    statusStopped: "остановлен",
    statusFailed: "ошибка",
    statusNotInstalled: "не установлен",
    statusActivating: "запускается",
    statusDeactivating: "останавливается",
    statusUnknown: "неизвестно",
    statsMissing: "Сборщик не запущен",
    statsOk: "Сборщик работает",
    statsStale: "Snapshot устарел",
    statsError: "Ошибка сборщика",
    restart: "Рестарт",
    copied: "Скопировано",
    copyFailed: "Не удалось скопировать",
    keyCreated: "Ключ создан",
    keyDeleted: "Ключ удалён",
    backupCreated: "Бекап создан",
    serviceRestarted: "Сервис перезапущен",
    statsRepaired: "Статистика починена",
    statsCollected: "Статистика собрана",
    confirmDelete: "Удалить ключ",
    confirmRestart: "Перезапустить",
    invalidUser: "Используйте латиницу, цифры, _, . или -",
    loading: "Загрузка...",
    never: "никогда",
    lightTheme: "Светлая",
    darkTheme: "Тёмная",
    configMode: "Режим",
    configDomain: "Домен",
    configTemplate: "Шаблон",
    configVersion: "Версия",
    pageDashboardTitle: "Обзор",
    pageDashboardKicker: "Локальная админка",
    pageTrafficTitle: "Трафик",
    pageTrafficKicker: "Статистика",
    pageKeysTitle: "Ключи",
    pageKeysKicker: "Доступ",
    pageBackupsTitle: "Бекапы",
    pageBackupsKicker: "Переезд",
    pageLogsTitle: "Логи",
    pageLogsKicker: "Журнал",
    pageSettingsTitle: "Настройки",
    pageSettingsKicker: "Параметры",
  },
};

const state = {
  overview: null,
  users: [],
  events: [],
  lang: "en",
  page: "dashboard",
  theme: document.documentElement.dataset.theme || "light",
};

const t = (key) => (i18n[state.lang] && i18n[state.lang][key]) || i18n.en[key] || key;

const fmtBytes = (value = 0) => {
  const units = ["B", "KB", "MB", "GB", "TB"];
  let n = Number(value) || 0;
  let i = 0;
  while (n >= 1024 && i < units.length - 1) {
    n /= 1024;
    i += 1;
  }
  return `${n.toFixed(i === 0 ? 0 : 1)} ${units[i]}`;
};

const fmtDate = (epoch) => {
  if (!epoch) return t("never");
  return new Date(epoch * 1000).toLocaleString(state.lang === "ru" ? "ru-RU" : "en-US");
};

const fmtDuration = (seconds = 0) => {
  let value = Math.max(0, Math.floor(Number(seconds) || 0));
  const days = Math.floor(value / 86400);
  value %= 86400;
  const hours = Math.floor(value / 3600);
  value %= 3600;
  const minutes = Math.floor(value / 60);
  if (days) return `${days}d ${hours}h`;
  if (hours) return `${hours}h ${minutes}m`;
  return `${minutes}m`;
};

const escapeHtml = (value) => String(value ?? "").replace(/[&<>"']/g, (ch) => ({
  "&": "&amp;",
  "<": "&lt;",
  ">": "&gt;",
  '"': "&quot;",
  "'": "&#039;",
})[ch]);

const escapeAttr = (value) => escapeHtml(value).replace(/`/g, "&#096;");

const toast = (message) => {
  const el = $("#toast");
  el.textContent = message;
  el.classList.add("show");
  clearTimeout(toast._timer);
  toast._timer = setTimeout(() => el.classList.remove("show"), 2800);
};

const addEvent = (title, detail = "") => {
  state.events.unshift({ title, detail, time: new Date() });
  state.events = state.events.slice(0, 10);
  renderEvents();
};

async function api(path, options = {}) {
  const headers = {
    "Accept": "application/json",
    "X-GoTelegram-Admin": "1",
    ...(options.headers || {}),
  };
  if (options.body && !headers["Content-Type"]) headers["Content-Type"] = "application/json";
  const res = await fetch(path, { ...options, headers, credentials: "same-origin" });
  const data = await res.json().catch(() => ({}));
  if (!res.ok || data.ok === false) throw new Error(data.error || `HTTP ${res.status}`);
  return data.data ?? data;
}

function applyI18n() {
  document.documentElement.lang = state.lang;
  $$("[data-i18n]").forEach((el) => {
    el.textContent = t(el.dataset.i18n);
  });
  $$("[data-i18n-placeholder]").forEach((el) => {
    el.placeholder = t(el.dataset.i18nPlaceholder);
  });
  $("#themeToggle").textContent = state.theme === "dark" ? t("themeLight") : t("themeDark");
  $("#languageBadge").textContent = state.lang.toUpperCase();
  $("#settingsLanguage").textContent = state.lang === "ru" ? "Русский" : "English";
  $("#settingsTheme").textContent = state.theme === "dark" ? t("darkTheme") : t("lightTheme");
  updatePageTitle();
}

function setTheme(theme) {
  state.theme = theme === "dark" ? "dark" : "light";
  document.documentElement.dataset.theme = state.theme;
  localStorage.setItem("gotelegram-theme", state.theme);
  applyI18n();
  if (state.overview) drawTrafficChart(state.overview.stats_history || []);
}

function setPage(page, push = true) {
  const next = $(`[data-page="${page}"]`) ? page : "dashboard";
  state.page = next;
  $$(".page-panel").forEach((panel) => panel.classList.toggle("active", panel.dataset.page === next));
  $$("[data-nav]").forEach((item) => item.classList.toggle("active", item.dataset.nav === next));
  $("#sidebar").classList.remove("open");
  updatePageTitle();
  if (push && location.hash !== `#${next}`) {
    history.replaceState(null, "", `#${next}`);
  }
}

function updatePageTitle() {
  const cap = state.page.charAt(0).toUpperCase() + state.page.slice(1);
  $("#pageTitle").textContent = t(`page${cap}Title`);
  $("#pageKicker").textContent = t(`page${cap}Kicker`);
}

function updateLanguageFromOverview(data) {
  const lang = String(data.language || data.config?.language || "en").toLowerCase();
  state.lang = lang === "ru" ? "ru" : "en";
  applyI18n();
}

function statusLabel(status) {
  const key = `status${String(status || "unknown").replace(/(^|_)([a-z])/g, (_, __, ch) => ch.toUpperCase())}`;
  const label = t(key);
  return label === key ? (status || t("healthUnknown")) : label;
}

function healthLabel(health) {
  const labels = {
    ok: t("healthOk"),
    error: t("healthError"),
    stale: t("healthStale"),
    stopped: t("healthStopped"),
    not_installed: t("healthNotInstalled"),
  };
  return labels[health] || t("healthUnknown");
}

function renderServices(services = {}) {
  const items = [
    { key: "telemt", label: "telemt", api: "telemt" },
    { key: "nginx", label: "nginx", api: "nginx" },
    { key: "bot", label: "bot", api: "gotelegram-bot" },
    { key: "stats", label: "stats", api: "gotelegram-stats" },
    { key: "admin", label: "admin", api: "gotelegram-admin" },
  ];
  $("#services").innerHTML = items.map((item) => {
    const status = services[item.key] || "unknown";
    const disabled = item.key === "admin" || status === "not_installed";
    return `<article class="service status-${escapeAttr(status)}">
      <div>
        <strong>${escapeHtml(item.label)}</strong>
        <span><i></i>${escapeHtml(statusLabel(status))}</span>
      </div>
      <button class="soft" data-restart="${escapeAttr(item.api)}" ${disabled ? "disabled" : ""}>${escapeHtml(t("restart"))}</button>
    </article>`;
  }).join("");
}

function runtimeData() {
  const raw = state.overview?.runtime_summary;
  if (!raw || typeof raw !== "object") return null;
  return raw.data && typeof raw.data === "object" ? raw.data : raw;
}

function renderRuntime() {
  const data = runtimeData();
  if (!data) {
    $("#runtimeCards").innerHTML = `<div class="empty">${escapeHtml(t("noRuntime"))}</div>`;
    $("#runtimeIssues").innerHTML = "";
    return;
  }
  const revision = String(data.revision || state.overview?.runtime_summary?.revision || "--");
  const cards = [
    [t("uptime"), fmtDuration(data.uptime_seconds)],
    [t("connections"), data.connections_total ?? 0],
    [t("badConnections"), data.connections_bad_total ?? 0],
    [t("users"), data.configured_users ?? state.overview?.users_count ?? 0],
    [t("revision"), revision.slice(0, 10)],
  ];
  $("#runtimeCards").innerHTML = cards.map(([label, value]) => `
    <article>
      <span>${escapeHtml(label)}</span>
      <strong>${escapeHtml(value)}</strong>
    </article>
  `).join("");
  const bad = Array.isArray(data.connections_bad_by_class) ? data.connections_bad_by_class : [];
  $("#runtimeIssues").innerHTML = bad.length ? bad.map((item) => `
    <div class="issue">
      <span>${escapeHtml(item.class || "unknown")}</span>
      <strong>${escapeHtml(item.total ?? 0)}</strong>
    </div>
  `).join("") : "";
}

function renderOverview() {
  const data = state.overview;
  if (!data) return;
  const cfg = data.config || {};
  const stats = data.stats_current || {};
  const bind = data.admin_bind || {};
  $("#sidebarVersion").textContent = `v${data.version || "--"}`;
  $("#sidebarBind").textContent = `${bind.host || "127.0.0.1"}:${bind.port || 1984}`;
  $("#settingsBind").textContent = `${bind.host || "127.0.0.1"}:${bind.port || 1984}`;
  $("#metricMode").textContent = cfg.mode || "--";
  $("#metricDomain").textContent = cfg.domain || cfg.mask_host || "--";
  $("#metricUsers").textContent = data.users_count ?? 0;
  $("#metricProxyTraffic").textContent = fmtBytes(stats.proxy_bytes);
  $("#metricProxyPackets").textContent = `${stats.proxy_pkts || 0} ${t("packets")}`;
  $("#metricSiteTraffic").textContent = fmtBytes(stats.site_bytes);
  $("#metricSitePackets").textContent = `${stats.site_pkts || 0} ${t("packets")}`;
  $("#lastRefresh").textContent = fmtDate(Math.floor(Date.now() / 1000));
  renderServices(data.services || {});
  renderRuntime();
  renderStats();
  renderBackups(data.backups || []);
  renderConfig();
}

function renderStats() {
  const status = state.overview?.stats_status || {};
  const stats = state.overview?.stats_current || {};
  const historyRows = state.overview?.stats_history || [];
  $("#statsHealth").className = `status-pill health-${escapeAttr(status.health || "unknown")}`;
  $("#statsHealth").textContent = healthLabel(status.health);
  $("#collectorState").textContent = status.service ? statusLabel(status.service) : "--";
  $("#lastStatsPoint").textContent = status.last_ts ? fmtDate(status.last_ts) : t("never");
  $("#historyRows").textContent = status.history_rows ?? historyRows.length;
  $("#repairStatsBtn").classList.toggle("attention", status.health !== "ok");
  $("#collectStatsBtn").disabled = status.service === "not_installed";
  $("#metricProxyTraffic").textContent = fmtBytes(stats.proxy_bytes);
  $("#metricSiteTraffic").textContent = fmtBytes(stats.site_bytes);
  drawTrafficChart(historyRows);
  renderHistoryTable(historyRows);
}

function drawTrafficChart(rows) {
  const el = $("#trafficChart");
  const points = rows.slice(-120);
  const proxyColor = getComputedStyle(document.documentElement).getPropertyValue("--blue").trim() || "#2563eb";
  const siteColor = getComputedStyle(document.documentElement).getPropertyValue("--green").trim() || "#0f9f6e";
  if (points.length < 2) {
    el.innerHTML = `<div class="empty-chart">
      <strong>${escapeHtml(t("noHistory"))}</strong>
      <span>${escapeHtml(state.overview?.stats_status?.health === "ok" ? t("statsOk") : t("statsMissing"))}</span>
    </div>`;
    return;
  }
  const width = 900;
  const height = 300;
  const pad = { l: 54, r: 22, t: 24, b: 42 };
  const max = Math.max(1, ...points.map((p) => Math.max(p.proxy_delta || 0, p.site_delta || 0)));
  const plotW = width - pad.l - pad.r;
  const plotH = height - pad.t - pad.b;
  const toX = (i) => pad.l + (plotW * i) / Math.max(1, points.length - 1);
  const toY = (v) => pad.t + plotH - ((v || 0) / max) * plotH;
  const pathFor = (key) => points.map((p, i) => `${i === 0 ? "M" : "L"}${toX(i).toFixed(1)},${toY(p[key]).toFixed(1)}`).join(" ");
  const grid = Array.from({ length: 5 }, (_, i) => {
    const y = pad.t + (plotH / 4) * i;
    return `<line x1="${pad.l}" y1="${y}" x2="${width - pad.r}" y2="${y}"></line>`;
  }).join("");
  el.innerHTML = `<svg viewBox="0 0 ${width} ${height}" role="img" aria-label="Traffic history">
    <g class="grid">${grid}</g>
    <path class="area proxy-area" d="${pathFor("proxy_delta")} L${width - pad.r},${height - pad.b} L${pad.l},${height - pad.b} Z"></path>
    <path class="line proxy-line" d="${pathFor("proxy_delta")}"></path>
    <path class="line site-line" d="${pathFor("site_delta")}"></path>
    <text x="${pad.l}" y="17" class="axis">max ${escapeHtml(fmtBytes(max))}/min</text>
    <text x="${pad.l}" y="${height - 12}" class="legend" fill="${proxyColor}">proxy</text>
    <text x="${pad.l + 74}" y="${height - 12}" class="legend" fill="${siteColor}">site</text>
  </svg>`;
}

function renderHistoryTable(rows) {
  const latest = rows.slice(-12).reverse();
  if (!latest.length) {
    $("#historyTable").innerHTML = `<tr><td colspan="5" class="empty-cell">${escapeHtml(t("noHistory"))}</td></tr>`;
    return;
  }
  $("#historyTable").innerHTML = latest.map((row) => `
    <tr>
      <td data-label="${escapeAttr(t("tableTime"))}">${escapeHtml(fmtDate(row.epoch))}</td>
      <td data-label="${escapeAttr(t("tableProxyDelta"))}">${escapeHtml(fmtBytes(row.proxy_delta))}</td>
      <td data-label="${escapeAttr(t("tableSiteDelta"))}">${escapeHtml(fmtBytes(row.site_delta))}</td>
      <td data-label="${escapeAttr(t("tableProxyTotal"))}">${escapeHtml(fmtBytes(row.proxy_bytes))}</td>
      <td data-label="${escapeAttr(t("tableSiteTotal"))}">${escapeHtml(fmtBytes(row.site_bytes))}</td>
    </tr>
  `).join("");
}

function renderUsers() {
  const tbody = $("#usersTable");
  if (!state.users.length) {
    tbody.innerHTML = `<tr><td colspan="4" class="empty-cell">${escapeHtml(t("noKeys"))}</td></tr>`;
    return;
  }
  tbody.innerHTML = state.users.map((user) => `
    <tr>
      <td data-label="${escapeAttr(t("tableUser"))}">
        <strong>${escapeHtml(user.name)}</strong>${user.main ? ` <small>${escapeHtml(t("main"))}</small>` : ""}
      </td>
      <td data-label="${escapeAttr(t("tableSecret"))}"><code title="${escapeAttr(user.secret)}">${escapeHtml(user.secret)}</code></td>
      <td data-label="${escapeAttr(t("tableLink"))}"><button class="soft" data-copy="${escapeAttr(user.link)}">${escapeHtml(t("copyLink"))}</button></td>
      <td data-label="${escapeAttr(t("tableActions"))}" class="actions">
        <button class="soft" data-copy="${escapeAttr(user.secret)}">${escapeHtml(t("copySecret"))}</button>
        <button class="danger" data-delete="${escapeAttr(user.name)}" ${user.main ? "disabled" : ""}>${escapeHtml(t("delete"))}</button>
      </td>
    </tr>
  `).join("");
}

function renderBackups(backups) {
  const box = $("#backupsList");
  if (!backups.length) {
    box.innerHTML = `<div class="empty">${escapeHtml(t("noBackups"))}</div>`;
    return;
  }
  box.innerHTML = backups.map((item) => `
    <div class="backup-item">
      <div>
        <strong>${escapeHtml(item.name)}</strong>
        <span>${escapeHtml(item.path)} · ${escapeHtml(fmtDate(item.mtime))}</span>
      </div>
      <div>${escapeHtml(fmtBytes(item.size))}${item.encrypted ? " · encrypted" : ""}</div>
    </div>
  `).join("");
}

function renderEvents() {
  const box = $("#events");
  if (!state.events.length) {
    box.innerHTML = `<div class="empty">${escapeHtml(t("noEvents"))}</div>`;
    return;
  }
  box.innerHTML = state.events.map((item) => `
    <div class="event">
      <strong>${escapeHtml(item.title)}</strong>
      <small>${escapeHtml(item.detail || item.time.toLocaleTimeString())}</small>
    </div>
  `).join("");
}

function renderConfig() {
  const cfg = state.overview?.config || {};
  const items = [
    [t("configMode"), cfg.mode || "--"],
    [t("configDomain"), cfg.domain || cfg.mask_host || "--"],
    [t("configTemplate"), cfg.template_id || cfg.template || "--"],
    [t("configVersion"), state.overview?.version || "--"],
    [t("bindAddress"), `${state.overview?.admin_bind?.host || "127.0.0.1"}:${state.overview?.admin_bind?.port || 1984}`],
  ];
  $("#configList").innerHTML = items.map(([label, value]) => `
    <div>
      <span>${escapeHtml(label)}</span>
      <strong>${escapeHtml(value)}</strong>
    </div>
  `).join("");
}

async function refreshAll() {
  const btn = $("#refreshBtn");
  btn.disabled = true;
  try {
    state.overview = await api("/api/overview");
    updateLanguageFromOverview(state.overview);
    state.users = await api("/api/users");
    renderOverview();
    renderUsers();
  } catch (err) {
    toast(err.message);
  } finally {
    btn.disabled = false;
  }
}

async function addUser(name) {
  const data = await api("/api/users", {
    method: "POST",
    body: JSON.stringify({ name }),
  });
  addEvent(t("keyCreated"), data.name);
  toast(t("keyCreated"));
  await refreshAll();
}

async function deleteUser(name) {
  await api(`/api/users/${encodeURIComponent(name)}`, { method: "DELETE" });
  addEvent(t("keyDeleted"), name);
  toast(t("keyDeleted"));
  await refreshAll();
}

async function createBackup() {
  const btn = $("#createBackupBtn");
  btn.disabled = true;
  try {
    const data = await api("/api/backups", { method: "POST", body: "{}" });
    addEvent(t("backupCreated"), data.path || "");
    toast(t("backupCreated"));
    await refreshAll();
  } catch (err) {
    toast(err.message);
  } finally {
    btn.disabled = false;
  }
}

async function loadLogs() {
  const service = $("#logService").value;
  $("#logsBox").textContent = t("loading");
  try {
    $("#logsBox").textContent = await api(`/api/logs?service=${encodeURIComponent(service)}`);
  } catch (err) {
    $("#logsBox").textContent = err.message;
  }
}

async function restartService(name) {
  await api(`/api/services/${encodeURIComponent(name)}/restart`, { method: "POST", body: "{}" });
  addEvent(t("serviceRestarted"), name);
  toast(`${name} ${t("serviceRestarted").toLowerCase()}`);
  await refreshAll();
}

async function repairStats() {
  const btn = $("#repairStatsBtn");
  btn.disabled = true;
  try {
    await api("/api/stats/repair", { method: "POST", body: "{}" });
    addEvent(t("statsRepaired"));
    toast(t("statsRepaired"));
    await refreshAll();
  } catch (err) {
    toast(err.message);
  } finally {
    btn.disabled = false;
  }
}

async function collectStats() {
  const btn = $("#collectStatsBtn");
  btn.disabled = true;
  try {
    await api("/api/stats/collect", { method: "POST", body: "{}" });
    addEvent(t("statsCollected"));
    toast(t("statsCollected"));
    await refreshAll();
  } catch (err) {
    toast(err.message);
  } finally {
    btn.disabled = false;
  }
}

async function copyText(value) {
  try {
    await navigator.clipboard.writeText(value);
    toast(t("copied"));
  } catch (_) {
    const area = document.createElement("textarea");
    area.value = value;
    area.setAttribute("readonly", "");
    area.style.position = "fixed";
    area.style.opacity = "0";
    document.body.appendChild(area);
    area.select();
    const ok = document.execCommand("copy");
    area.remove();
    toast(ok ? t("copied") : t("copyFailed"));
  }
}

document.addEventListener("click", async (eventObj) => {
  const nav = eventObj.target.closest("[data-nav]");
  if (nav) {
    setPage(nav.dataset.nav);
    return;
  }

  const button = eventObj.target.closest("button");
  if (!button) return;

  if (button.id === "themeToggle") {
    setTheme(state.theme === "dark" ? "light" : "dark");
  } else if (button.id === "menuBtn") {
    $("#sidebar").classList.toggle("open");
  } else if (button.dataset.copy) {
    await copyText(button.dataset.copy);
  } else if (button.dataset.delete) {
    const name = button.dataset.delete;
    if (confirm(`${t("confirmDelete")} ${name}?`)) deleteUser(name).catch((err) => toast(err.message));
  } else if (button.dataset.restart) {
    const name = button.dataset.restart;
    if (confirm(`${t("confirmRestart")} ${name}?`)) restartService(name).catch((err) => toast(err.message));
  }
});

$("#addUserForm").addEventListener("submit", (eventObj) => {
  eventObj.preventDefault();
  const input = $("#userName");
  const name = input.value.trim();
  if (!/^[A-Za-z0-9_.-]{1,48}$/.test(name)) {
    toast(t("invalidUser"));
    return;
  }
  input.value = "";
  addUser(name).catch((err) => toast(err.message));
});

$("#refreshBtn").addEventListener("click", refreshAll);
$("#createBackupBtn").addEventListener("click", createBackup);
$("#loadLogsBtn").addEventListener("click", loadLogs);
$("#repairStatsBtn").addEventListener("click", repairStats);
$("#collectStatsBtn").addEventListener("click", collectStats);
window.addEventListener("hashchange", () => setPage((location.hash || "#dashboard").slice(1), false));

setPage((location.hash || "#dashboard").slice(1), false);
setTheme(state.theme);
renderEvents();
refreshAll();
loadLogs();