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: "Service health",
    servicesHelp: "Systemd service status for telemt, nginx, the bot, the traffic collector and the local admin.",
    runtimeEyebrow: "Runtime",
    runtimeTitle: "telemt summary",
    runtimeHelp: "Runtime data comes from the local telemt API and shows what the proxy engine sees right now.",
    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: "Update stats",
    collectStatsHelp: "Run one traffic collection now.",
    repairStats: "Restart collector",
    repairStatsHelp: "Reinstall and restart the background service that writes traffic history.",
    tableTime: "Time",
    tablePeriod: "Period",
    tableStatus: "Status",
    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",
    enabled: "Enabled",
    disabled: "Disabled",
    applying: "Applying...",
    changesApplyInBackground: "Changes are being applied in the background",
    disableKey: "Disable key",
    enableKey: "Enable key",
    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",
    noTrafficForRange: "No data for this range 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: "Collector restarted",
    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",
    configSiteStatus: "Site check",
    configTemplate: "Template",
    configVersion: "Version",
    siteOk: "Site 200 OK",
    siteHttp: "Site HTTP",
    siteMissing: "Domain is not configured",
    siteInvalid: "Invalid domain",
    siteError: "Site check failed",
    siteNotChecked: "Site check pending",
    logsLines: "lines",
    logsNoData: "No log lines",
    languageSaved: "Language saved",
    keyEnabled: "Key enabled",
    keyDisabled: "Key disabled",
    visualTitle: "Port 443 listeners",
    visualText: "Actual TCP/UDP listeners on public port 443: telemt, website, Xray/3x-ui, AmneziaWG or another service.",
    port443Checked: "checked",
    port443NoListeners: "No 443 listeners found",
    port443Listeners: "listeners",
    port443Error: "Port check failed",
    roleMtproxy: "MTProxy",
    roleSite: "Website",
    roleXray: "Xray / 3x-ui",
    roleAmneziawg: "AmneziaWG",
    roleOther: "Other",
    range15m: "15 min",
    range1h: "1 hour",
    range24h: "24 hours",
    rangeMonth: "Month",
    viewChart: "Chart",
    viewRows: "Rows",
    chartMax: "max {value} per interval",
    chartProxy: "proxy",
    chartSite: "site",
    encrypted: "encrypted",
    ariaAdminSections: "Admin sections",
    ariaMenu: "Open menu",
    ariaLanguage: "Language",
    ariaClose: "Close",
    ariaTrafficHistory: "Traffic history",
    ariaTrafficRange: "Traffic range",
    ariaTrafficView: "Traffic view",
    promoEyebrow: "Promo",
    promoTitle: "Support goTelegram Pro",
    promoHosting1: "Hosting #1",
    promoHosting2: "Hosting #2",
    promoTips: "Tips",
    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 прокси",
    metricSiteTraffic: "Трафик сайта",
    configuredUsers: "настроенных пользователей",
    packets: "пакетов",
    servicesEyebrow: "Сервисы",
    servicesTitle: "Состояние служб",
    servicesHelp: "Статус systemd-служб: telemt, nginx, бот, сборщик трафика и локальная админка.",
    runtimeEyebrow: "Среда выполнения",
    runtimeTitle: "Сводка telemt",
    runtimeHelp: "Данные среды выполнения берутся из локального API telemt и показывают, что ядро прокси видит прямо сейчас.",
    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: "Обновить статистику",
    collectStatsHelp: "Запустить один сбор трафика прямо сейчас.",
    repairStats: "Перезапустить сборщик",
    repairStatsHelp: "Переустановить и перезапустить фоновую службу, которая пишет историю трафика.",
    tableTime: "Время",
    tablePeriod: "Период",
    tableStatus: "Статус",
    tableProxyDelta: "Прирост прокси",
    tableSiteDelta: "Прирост сайта",
    tableProxyTotal: "Всего прокси",
    tableSiteTotal: "Всего по сайту",
    tableUser: "Пользователь",
    tableSecret: "Секрет",
    tableLink: "Ссылка",
    tableActions: "Действия",
    userPlaceholder: "client-name",
    addKey: "Добавить ключ",
    copyLink: "Копировать ссылку",
    copySecret: "Копировать секрет",
    delete: "Удалить",
    enabled: "Включён",
    disabled: "Отключён",
    applying: "Применяется...",
    changesApplyInBackground: "Изменения применяются в фоне",
    disableKey: "Отключить ключ",
    enableKey: "Включить ключ",
    main: "основной",
    createBackup: "Создать бекап",
    loadLogs: "Загрузить",
    panelLanguage: "Язык панели",
    theme: "Тема",
    bindAddress: "Адрес привязки",
    dashboard: "Обзор",
    noKeys: "Ключей пока нет",
    noBackups: "Бекапов пока нет",
    noEvents: "Событий пока нет",
    noHistory: "Истории трафика пока нет",
    noTrafficForRange: "За этот период данных пока нет",
    noRuntime: "Данные среды выполнения 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: "Снимок устарел",
    statsError: "Ошибка сборщика",
    restart: "Перезапустить",
    copied: "Скопировано",
    copyFailed: "Не удалось скопировать",
    keyCreated: "Ключ создан",
    keyDeleted: "Ключ удалён",
    backupCreated: "Бекап создан",
    serviceRestarted: "Сервис перезапущен",
    statsRepaired: "Сборщик перезапущен",
    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",
    configSiteStatus: "Проверка сайта",
    configTemplate: "Шаблон",
    configVersion: "Версия",
    siteOk: "Сайт 200 OK",
    siteHttp: "Сайт HTTP",
    siteMissing: "Домен не настроен",
    siteInvalid: "Некорректный домен",
    siteError: "Проверка сайта не прошла",
    siteNotChecked: "Проверка сайта ожидает",
    logsLines: "строк",
    logsNoData: "Строк логов нет",
    languageSaved: "Язык сохранён",
    keyEnabled: "Ключ включён",
    keyDisabled: "Ключ отключён",
    visualTitle: "Кто слушает порт 443",
    visualText: "Реальные TCP/UDP-процессы на публичном 443: telemt, сайт, Xray/3x-ui, AmneziaWG или другой сервис.",
    port443Checked: "проверено",
    port443NoListeners: "Слушателей 443 не найдено",
    port443Listeners: "слушателей",
    port443Error: "Проверка порта не удалась",
    roleMtproxy: "MTProxy",
    roleSite: "Сайт",
    roleXray: "Xray / 3x-ui",
    roleAmneziawg: "AmneziaWG",
    roleOther: "Другое",
    range15m: "15 мин",
    range1h: "1 час",
    range24h: "24 часа",
    rangeMonth: "Месяц",
    viewChart: "График",
    viewRows: "Строки",
    chartMax: "макс. {value} за интервал",
    chartProxy: "прокси",
    chartSite: "сайт",
    encrypted: "зашифровано",
    ariaAdminSections: "Разделы админки",
    ariaMenu: "Открыть меню",
    ariaLanguage: "Язык",
    ariaClose: "Закрыть",
    ariaTrafficHistory: "История трафика",
    ariaTrafficRange: "Период трафика",
    ariaTrafficView: "Вид трафика",
    promoEyebrow: "Промо",
    promoTitle: "Поддержать goTelegram Pro",
    promoHosting1: "Хостинг #1",
    promoHosting2: "Хостинг #2",
    promoTips: "Чаевые",
    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,
  stats: null,
  users: [],
  events: [],
  lang: "en",
  page: "dashboard",
  theme: document.documentElement.dataset.theme || "light",
  trafficRange: "1h",
  trafficView: "chart",
  pendingUsers: new Set(),
};

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

const trafficRanges = ["15m", "1h", "24h", "month"];

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);
  });
  $$("[data-i18n-title]").forEach((el) => {
    el.title = t(el.dataset.i18nTitle);
  });
  $$("[data-i18n-aria-label]").forEach((el) => {
    el.setAttribute("aria-label", t(el.dataset.i18nAriaLabel));
  });
  $("#themeToggle").textContent = state.theme === "dark" ? t("themeLight") : t("themeDark");
  $("#languageSelect").value = state.lang;
  $("#settingsLanguage").textContent = state.lang === "ru" ? "Русский" : "English";
  $("#settingsTheme").textContent = state.theme === "dark" ? t("darkTheme") : t("lightTheme");
  $("#visualTitle").textContent = t("visualTitle");
  $("#visualText").textContent = t("visualText");
  updateTrafficControls();
  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) renderStats();
}

async function setLanguage(lang) {
  const previous = state.lang;
  state.lang = lang === "ru" ? "ru" : "en";
  applyI18n();
  try {
    const data = await api("/api/settings/language", {
      method: "POST",
      body: JSON.stringify({ language: state.lang }),
    });
    state.lang = data.language === "ru" ? "ru" : "en";
    applyI18n();
    toast(t("languageSaved"));
    await refreshAll();
  } catch (err) {
    state.lang = previous;
    applyI18n();
    toast(err.message);
  }
}

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}`);
  }
  if (next === "traffic") {
    refreshStats().catch((err) => toast(err.message));
  }
}

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 siteStatusText(site = {}) {
  if (!site.host) return t("siteMissing");
  if (site.error === "invalid_domain") return t("siteInvalid");
  if (site.ok) return t("siteOk");
  if (site.checked && site.http_code) return `${t("siteHttp")} ${site.http_code}`;
  if (site.error) return t("siteError");
  return t("siteNotChecked");
}

function siteStatusClass(site = {}) {
  if (site.ok) return "ok";
  if (!site.host || !site.checked) return "warn";
  return "error";
}

function renderSiteStatus() {
  const cfg = state.overview?.config || {};
  const site = state.overview?.site_status || {};
  $("#metricDomain").textContent = site.host || cfg.domain || cfg.mask_host || "--";
  const statusEl = $("#siteStatus");
  statusEl.textContent = siteStatusText(site);
  statusEl.className = `metric-status ${siteStatusClass(site)}`;
  statusEl.title = site.url || "";
}

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

function renderPort443(payload = {}) {
  const listeners = Array.isArray(payload.listeners) ? payload.listeners : [];
  const summary = $("#port443Summary");
  const list = $("#port443List");
  if (payload.error) {
    summary.textContent = t("port443Error");
    summary.className = "port-status error";
  } else if (!listeners.length) {
    summary.textContent = t("port443NoListeners");
    summary.className = "port-status warn";
  } else {
    summary.textContent = `${listeners.length} ${t("port443Listeners")}`;
    summary.className = "port-status ok";
  }
  if (!listeners.length) {
    list.innerHTML = `<div class="port-empty">${escapeHtml(payload.error || t("port443NoListeners"))}</div>`;
    return;
  }
  list.innerHTML = listeners.map((item) => {
    const title = `${item.proto || ""} ${item.address || ""} · ${item.process || "unknown"}${item.pid ? ` · pid ${item.pid}` : ""}`;
    return `<article class="port-listener role-${escapeAttr(item.role || "other")}" title="${escapeAttr(title)}">
      <div>
        <strong>${escapeHtml(roleLabel(item.role))}</strong>
        <span>${escapeHtml(item.process || "unknown")}${item.pid ? ` · pid ${escapeHtml(item.pid)}` : ""}</span>
      </div>
      <small>${escapeHtml(item.proto || "--")} · ${escapeHtml(item.address || "--")}</small>
    </article>`;
  }).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 || "--";
  renderSiteStatus();
  renderPort443(data.port_443 || {});
  $("#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 statsPayload() {
  if (state.stats) return state.stats;
  return {
    current: state.overview?.stats_current || {},
    history: state.overview?.stats_history || [],
    status: state.overview?.stats_status || {},
    summary_rows: [],
  };
}

function updateTrafficControls() {
  $$("[data-traffic-range]").forEach((btn) => {
    btn.classList.toggle("active", btn.dataset.trafficRange === state.trafficRange);
  });
  $$("[data-traffic-view]").forEach((btn) => {
    btn.classList.toggle("active", btn.dataset.trafficView === state.trafficView);
  });
}

function trafficRangeLabel(range) {
  const labels = {
    "15m": t("range15m"),
    "1h": t("range1h"),
    "24h": t("range24h"),
    month: t("rangeMonth"),
  };
  return labels[range] || range;
}

function rangeSeconds(range) {
  return {
    "15m": 15 * 60,
    "1h": 60 * 60,
    "24h": 24 * 60 * 60,
    month: 30 * 24 * 60 * 60,
  }[range] || 60 * 60;
}

function filterTrafficRows(rows, range = state.trafficRange) {
  if (!Array.isArray(rows) || !rows.length) return [];
  const latest = Math.max(...rows.map((row) => Number(row.epoch) || 0));
  const cutoff = latest - rangeSeconds(range);
  return rows.filter((row) => (Number(row.epoch) || 0) >= cutoff);
}

function bucketTrafficRows(rows) {
  const filtered = filterTrafficRows(rows);
  if (filtered.length <= 140) return filtered;
  const chunk = Math.ceil(filtered.length / 120);
  const buckets = [];
  for (let i = 0; i < filtered.length; i += chunk) {
    const slice = filtered.slice(i, i + chunk);
    const last = slice[slice.length - 1];
    buckets.push({
      epoch: last.epoch,
      proxy_delta: slice.reduce((sum, item) => sum + (Number(item.proxy_delta) || 0), 0),
      site_delta: slice.reduce((sum, item) => sum + (Number(item.site_delta) || 0), 0),
      proxy_bytes: last.proxy_bytes,
      site_bytes: last.site_bytes,
    });
  }
  return buckets;
}

function fallbackTrafficSummaries(rows) {
  return trafficRanges.map((range) => {
    const windowRows = filterTrafficRows(rows, range);
    if (!windowRows.length) {
      return { range, points: 0, proxy_delta: 0, site_delta: 0, proxy_total: 0, site_total: 0 };
    }
    const first = windowRows[0];
    const last = windowRows[windowRows.length - 1];
    return {
      range,
      points: windowRows.length,
      proxy_delta: Math.max(0, (Number(last.proxy_bytes) || 0) - (Number(first.proxy_bytes) || 0)),
      site_delta: Math.max(0, (Number(last.site_bytes) || 0) - (Number(first.site_bytes) || 0)),
      proxy_total: Number(last.proxy_bytes) || 0,
      site_total: Number(last.site_bytes) || 0,
    };
  });
}

function renderStats() {
  const payload = statsPayload();
  const status = payload.status || {};
  const stats = payload.current || {};
  const historyRows = payload.history || [];
  const summaryRows = payload.summary_rows?.length ? payload.summary_rows : fallbackTrafficSummaries(historyRows);
  $("#statsHealth").className = `status-pill health-${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);
  updateTrafficControls();
  $("#trafficChart").classList.toggle("is-hidden", state.trafficView !== "chart");
  $("#trafficTableWrap").classList.toggle("is-hidden", state.trafficView !== "table");
  drawTrafficChart(historyRows);
  renderHistoryTable(summaryRows);
}

function drawTrafficChart(rows) {
  const el = $("#trafficChart");
  const points = bucketTrafficRows(rows);
  const proxyColor = getComputedStyle(document.documentElement).getPropertyValue("--blue").trim() || "#2563eb";
  const siteColor = getComputedStyle(document.documentElement).getPropertyValue("--green").trim() || "#0f9f6e";
  if (points.length < 2) {
    el.innerHTML = `<div class="empty-chart">
      <strong>${escapeHtml(points.length ? t("noTrafficForRange") : 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("");
  const axis = t("chartMax").replace("{value}", fmtBytes(max));
  el.innerHTML = `<svg viewBox="0 0 ${width} ${height}" role="img" aria-label="${escapeAttr(t("ariaTrafficHistory"))}">
    <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="${pad.l}" y="17" class="axis">${escapeHtml(axis)}</text>
    <text x="${pad.l}" y="${height - 12}" class="legend" fill="${proxyColor}">${escapeHtml(t("chartProxy"))}</text>
    <text x="${pad.l + 86}" y="${height - 12}" class="legend" fill="${siteColor}">${escapeHtml(t("chartSite"))}</text>
  </svg>`;
}

function renderHistoryTable(rows) {
  if (!rows.length) {
    $("#historyTable").innerHTML = `<tr><td colspan="5" class="empty-cell">${escapeHtml(t("noHistory"))}</td></tr>`;
    return;
  }
  $("#historyTable").innerHTML = rows.map((row) => `
    <tr>
      <td data-label="${escapeAttr(t("tablePeriod"))}"><strong>${escapeHtml(trafficRangeLabel(row.range))}</strong><small>${escapeHtml(row.points ? `${row.points} ${t("historyRows").toLowerCase()}` : t("noTrafficForRange"))}</small></td>
      <td data-label="${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"))}">${escapeHtml(fmtBytes(row.proxy_total))}</td>
      <td data-label="${escapeAttr(t("tableSiteTotal"))}">${escapeHtml(fmtBytes(row.site_total))}</td>
    </tr>
  `).join("");
}

function renderUsers() {
  const tbody = $("#usersTable");
  if (!state.users.length) {
    tbody.innerHTML = `<tr><td colspan="5" class="empty-cell">${escapeHtml(t("noKeys"))}</td></tr>`;
    return;
  }
  tbody.innerHTML = state.users.map((user) => {
    const pending = state.pendingUsers.has(user.name);
    return `
    <tr class="${user.enabled ? "" : "disabled-row"} ${pending ? "pending-row" : ""}">
      <td data-label="${escapeAttr(t("tableUser"))}">
        <strong>${escapeHtml(user.name)}</strong>${user.main ? ` <small>${escapeHtml(t("main"))}</small>` : ""}
      </td>
      <td data-label="${escapeAttr(t("tableStatus"))}">
        <div class="status-control">
          <label class="switch" title="${escapeAttr(user.main ? t("main") : (user.enabled ? t("disableKey") : t("enableKey")))}">
            <input type="checkbox" data-toggle-user="${escapeAttr(user.name)}" ${user.enabled ? "checked" : ""} ${user.main || pending ? "disabled" : ""}>
            <span></span>
          </label>
          <strong class="${user.enabled ? "state-on" : "state-off"}">${escapeHtml(pending ? t("applying") : (user.enabled ? t("enabled") : t("disabled")))}</strong>
        </div>
      </td>
      <td data-label="${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)}" ${user.enabled ? "" : "disabled"}>${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 ? ` · ${escapeHtml(t("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 site = state.overview?.site_status || {};
  const items = [
    [t("configMode"), cfg.mode || "--"],
    [t("configDomain"), cfg.domain || cfg.mask_host || "--"],
    [t("configSiteStatus"), siteStatusText(site)],
    [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");
    if (!state.stats) {
      state.stats = {
        current: state.overview.stats_current || {},
        history: state.overview.stats_history || [],
        status: state.overview.stats_status || {},
        summary_rows: [],
      };
    } else {
      state.stats = {
        ...state.stats,
        current: state.overview.stats_current || state.stats.current || {},
        status: state.overview.stats_status || state.stats.status || {},
      };
    }
    renderOverview();
    renderUsers();
  } catch (err) {
    toast(err.message);
  } finally {
    btn.disabled = false;
  }
}

async function refreshStats() {
  const data = await api(`/api/stats?range=${encodeURIComponent(state.trafficRange)}`);
  state.stats = data;
  renderStats();
}

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 setUserEnabled(name, enabled) {
  const previousUsers = state.users.map((user) => ({ ...user }));
  state.pendingUsers.add(name);
  state.users = state.users.map((user) => user.name === name ? { ...user, enabled } : user);
  renderUsers();
  try {
    const data = await api(`/api/users/${encodeURIComponent(name)}/enabled`, {
      method: "POST",
      body: JSON.stringify({ enabled }),
    });
    state.users = state.users.map((user) => user.name === name ? { ...user, enabled: data.enabled } : user);
    const message = data.enabled ? t("keyEnabled") : t("keyDisabled");
    addEvent(message, name);
    toast(t("changesApplyInBackground"));
    setTimeout(() => refreshAll().catch((err) => toast(err.message)), 1200);
  } catch (err) {
    state.users = previousUsers;
    toast(err.message);
  } finally {
    setTimeout(() => {
      state.pendingUsers.delete(name);
      renderUsers();
    }, 700);
  }
}

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;
  const btn = $("#loadLogsBtn");
  btn.disabled = true;
  $("#logsMeta").textContent = "";
  $("#logsBox").textContent = t("loading");
  try {
    const payload = await api(`/api/logs?service=${encodeURIComponent(service)}`);
    if ($("#logService").value === service) {
      const structured = payload && typeof payload === "object";
      const text = typeof payload === "string" ? payload : (payload?.text || "");
      const lines = structured ? (payload.line_count ?? text.split("\n").filter(Boolean).length) : text.split("\n").filter(Boolean).length;
      const stateText = structured ? (payload.ok ? "OK" : `exit ${payload.exit_code ?? "?"}`) : "OK";
      $("#logsMeta").textContent = `${service} · ${lines} ${t("logsLines")} · ${stateText}`;
      $("#logsBox").textContent = text || t("logsNoData");
    }
  } catch (err) {
    $("#logsMeta").textContent = "";
    $("#logsBox").textContent = err.message;
  } finally {
    btn.disabled = false;
  }
}

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();
    await refreshStats();
  } 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();
    await refreshStats();
  } 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"));
  }
}

function maybeShowPromo() {
  const key = "gotelegram-promo-last";
  const now = Math.floor(Date.now() / 1000);
  const last = Number(localStorage.getItem(key) || 0);
  if (now - last < 86400) return;
  localStorage.setItem(key, String(now));
  $("#promoModal").hidden = false;
}

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") {
    $("#sidebar").classList.toggle("open");
  } else if (button.dataset.trafficRange) {
    state.trafficRange = trafficRanges.includes(button.dataset.trafficRange) ? button.dataset.trafficRange : "1h";
    updateTrafficControls();
    renderStats();
    refreshStats().catch((err) => toast(err.message));
  } else if (button.dataset.trafficView) {
    state.trafficView = button.dataset.trafficView === "table" ? "table" : "chart";
    renderStats();
  } else if (button.dataset.copy) {
    await copyText(button.dataset.copy);
  } else if (button.dataset.delete) {
    const name = button.dataset.delete;
    if (confirm(`${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));
  }
});

document.addEventListener("change", (eventObj) => {
  const input = eventObj.target.closest("[data-toggle-user]");
  if (!input) return;
  input.disabled = true;
  setUserEnabled(input.dataset.toggleUser, input.checked).catch((err) => {
    input.checked = !input.checked;
    input.disabled = false;
    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);
$("#languageSelect").addEventListener("change", (eventObj) => setLanguage(eventObj.target.value));
$("#promoClose").addEventListener("click", () => {
  $("#promoModal").hidden = true;
});
$("#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();
maybeShowPromo();