(function () {
  const FETCH_TIMEOUT_MS = 15000;
  const RETRY_DELAY_MS = 800;
  const RETRY_AFTER_ACCESS_DENIED_MS = 1200;

  const THEME_BG = { dark: "#1a1b26", light: "#d5d6db" };

  function getTheme() {
    if (typeof window === "undefined") return "dark";
    var twa = window.Telegram?.WebApp;
    if (twa?.colorScheme) {
      return twa.colorScheme;
    }
    var cssScheme = "";
    try {
      cssScheme = getComputedStyle(document.documentElement).getPropertyValue("--tg-color-scheme").trim();
    } catch (e) {}
    if (cssScheme === "light" || cssScheme === "dark") {
      return cssScheme;
    }
    if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
      return "dark";
    }
    return "light";
  }

  function applyTheme() {
    var scheme = getTheme();
    document.documentElement.dataset.theme = scheme;
    var bg = THEME_BG[scheme] || THEME_BG.dark;
    if (window.Telegram?.WebApp?.setBackgroundColor) {
      window.Telegram.WebApp.setBackgroundColor(bg);
    }
    if (window.Telegram?.WebApp?.setHeaderColor) {
      window.Telegram.WebApp.setHeaderColor(bg);
    }
  }

  applyTheme();
  if (typeof window !== "undefined" && window.Telegram?.WebApp) {
    setTimeout(applyTheme, 0);
    setTimeout(applyTheme, 100);
  } else if (window.matchMedia) {
    window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", applyTheme);
  }

  const MONTHS = [
    "Январь", "Февраль", "Март", "Апрель", "Май", "Июнь",
    "Июль", "Август", "Сентябрь", "Октябрь", "Ноябрь", "Декабрь"
  ];

  let current = new Date();
  let lastDutiesForList = [];
  let todayRefreshInterval = null;
  const calendarEl = document.getElementById("calendar");
  const monthTitleEl = document.getElementById("monthTitle");
  const dutyListEl = document.getElementById("dutyList");
  const loadingEl = document.getElementById("loading");
  const errorEl = document.getElementById("error");
  const accessDeniedEl = document.getElementById("accessDenied");
  const headerEl = document.querySelector(".header");
  const weekdaysEl = document.querySelector(".weekdays");
  const prevBtn = document.getElementById("prevMonth");
  const nextBtn = document.getElementById("nextMonth");

  /** YYYY-MM-DD in local time (for calendar keys, "today", request range). */
  function localDateString(d) {
    const y = d.getFullYear();
    const m = String(d.getMonth() + 1).padStart(2, "0");
    const day = String(d.getDate()).padStart(2, "0");
    return y + "-" + m + "-" + day;
  }

  /** True if duty (start_at/end_at UTC) overlaps the local day YYYY-MM-DD. */
  function dutyOverlapsLocalDay(d, dateKey) {
    const [y, m, day] = dateKey.split("-").map(Number);
    const dayStart = new Date(y, m - 1, day, 0, 0, 0, 0);
    const dayEnd = new Date(y, m - 1, day, 23, 59, 59, 999);
    const start = new Date(d.start_at);
    const end = new Date(d.end_at);
    return end > dayStart && start < dayEnd;
  }

  function firstDayOfMonth(d) {
    return new Date(d.getFullYear(), d.getMonth(), 1);
  }

  function lastDayOfMonth(d) {
    return new Date(d.getFullYear(), d.getMonth() + 1, 0);
  }

  function getMonday(d) {
    const day = d.getDay();
    const diff = d.getDate() - day + (day === 0 ? -6 : 1);
    return new Date(d.getFullYear(), d.getMonth(), diff);
  }

  /** Get tgWebAppData value from hash when it contains unencoded & and = (URLSearchParams would split it). Value runs from tgWebAppData= until next &tgWebApp or end. */
  function getTgWebAppDataFromHash(hash) {
    var idx = hash.indexOf("tgWebAppData=");
    if (idx === -1) return "";
    var start = idx + "tgWebAppData=".length;
    var end = hash.indexOf("&tgWebApp", start);
    if (end === -1) end = hash.length;
    var raw = hash.substring(start, end);
    try {
      return decodeURIComponent(raw);
    } catch (e) {
      return raw;
    }
  }

  function getInitData() {
    var fromSdk = (window.Telegram && window.Telegram.WebApp && window.Telegram.WebApp.initData) || "";
    if (fromSdk) return fromSdk;
    var hash = window.location.hash ? window.location.hash.slice(1) : "";
    if (hash) {
      var fromHash = getTgWebAppDataFromHash(hash);
      if (fromHash) return fromHash;
      try {
        var hashParams = new URLSearchParams(hash);
        var tgFromHash = hashParams.get("tgWebAppData");
        if (tgFromHash) return decodeURIComponent(tgFromHash);
      } catch (e) { /* ignore */ }
    }
    var q = window.location.search ? new URLSearchParams(window.location.search).get("tgWebAppData") : null;
    if (q) {
      try {
        return decodeURIComponent(q);
      } catch (e) {
        return q;
      }
    }
    return "";
  }

  function isLocalhost() {
    var h = window.location.hostname;
    return h === "localhost" || h === "127.0.0.1" || h === "";
  }

  function hasTelegramHashButNoInitData() {
    var hash = window.location.hash ? window.location.hash.slice(1) : "";
    if (!hash) return false;
    try {
      var keys = Array.from(new URLSearchParams(hash).keys());
      var hasVersion = keys.indexOf("tgWebAppVersion") !== -1;
      var hasData = keys.indexOf("tgWebAppData") !== -1 || getTgWebAppDataFromHash(hash);
      return hasVersion && !hasData;
    } catch (e) { return false; }
  }

  /** @param {string} [serverDetail] - message from API 403 detail (unused; kept for callers) */
  function showAccessDenied(serverDetail) {
    if (headerEl) headerEl.hidden = true;
    if (weekdaysEl) weekdaysEl.hidden = true;
    calendarEl.hidden = true;
    dutyListEl.hidden = true;
    loadingEl.classList.add("hidden");
    errorEl.hidden = true;
    accessDeniedEl.hidden = false;
  }

  function hideAccessDenied() {
    accessDeniedEl.hidden = true;
    if (headerEl) headerEl.hidden = false;
    if (weekdaysEl) weekdaysEl.hidden = false;
    calendarEl.hidden = false;
    dutyListEl.hidden = false;
  }

  function buildFetchOptions(initData) {
    var headers = {};
    if (initData) headers["X-Telegram-Init-Data"] = initData;
    var controller = new AbortController();
    var timeoutId = setTimeout(function () { controller.abort(); }, FETCH_TIMEOUT_MS);
    return { headers: headers, signal: controller.signal, timeoutId: timeoutId };
  }

  async function fetchDuties(from, to) {
    const base = window.location.origin;
    const url = base + "/api/duties?from=" + encodeURIComponent(from) + "&to=" + encodeURIComponent(to);
    const initData = getInitData();
    const opts = buildFetchOptions(initData);
    try {
      var res = await fetch(url, { headers: opts.headers, signal: opts.signal });
      if (res.status === 403) {
        var detail = "Доступ запрещён";
        try {
          var body = await res.json();
          if (body && body.detail !== undefined) {
            detail = typeof body.detail === "string" ? body.detail : (body.detail.msg || JSON.stringify(body.detail));
          }
        } catch (parseErr) { /* ignore */ }
        var err = new Error("ACCESS_DENIED");
        err.serverDetail = detail;
        throw err;
      }
      if (!res.ok) throw new Error("Ошибка загрузки");
      return res.json();
    } catch (e) {
      if (e.name === "AbortError") {
        throw new Error("Не удалось загрузить данные. Проверьте интернет.");
      }
      throw e;
    } finally {
      clearTimeout(opts.timeoutId);
    }
  }

  /** Fetch calendar events for range. Returns [] on non-200 or error. Does not throw for 403 (caller uses duties 403). */
  async function fetchCalendarEvents(from, to) {
    const base = window.location.origin;
    const url = base + "/api/calendar-events?from=" + encodeURIComponent(from) + "&to=" + encodeURIComponent(to);
    const initData = getInitData();
    const opts = buildFetchOptions(initData);
    try {
      var res = await fetch(url, { headers: opts.headers, signal: opts.signal });
      if (!res.ok) return [];
      return res.json();
    } catch (e) {
      return [];
    } finally {
      clearTimeout(opts.timeoutId);
    }
  }

  /** Build { localDateKey -> array of summary strings }. API date is UTC YYYY-MM-DD; map to local date for calendar grid. */
  function calendarEventsByDate(events) {
    const byDate = {};
    (events || []).forEach(function (e) {
      var utcMidnight = new Date(e.date + "T00:00:00Z");
      var key = localDateString(utcMidnight);
      if (!byDate[key]) byDate[key] = [];
      if (e.summary) byDate[key].push(e.summary);
    });
    return byDate;
  }

  function renderCalendar(year, month, dutiesByDate, calendarEventsByDate) {
    const first = firstDayOfMonth(new Date(year, month, 1));
    const last = lastDayOfMonth(new Date(year, month, 1));
    const start = getMonday(first);
    const today = localDateString(new Date());
    calendarEventsByDate = calendarEventsByDate || {};

    calendarEl.innerHTML = "";
    let d = new Date(start);
    const cells = 42;
    for (let i = 0; i < cells; i++) {
      const key = localDateString(d);
      const isOther = d.getMonth() !== month;
      const dayDuties = dutiesByDate[key] || [];
      const dutyList = dayDuties.filter(function (x) { return x.event_type === "duty"; });
      const unavailableList = dayDuties.filter(function (x) { return x.event_type === "unavailable"; });
      const vacationList = dayDuties.filter(function (x) { return x.event_type === "vacation"; });
      const hasAny = dayDuties.length > 0;
      const isToday = key === today;
      const eventSummaries = calendarEventsByDate[key] || [];
      const hasEvent = eventSummaries.length > 0;

      const cell = document.createElement("div");
      const showMarkers = !isOther;
      cell.className = "day" + (isOther ? " other-month" : "") + (isToday ? " today" : "") + (showMarkers && hasAny ? " has-duty" : "") + (showMarkers && hasEvent ? " holiday" : "");

      function namesAttr(list) { return list.length ? escapeHtml(list.map(function (x) { return x.full_name; }).join("\n")) : ""; }
      function titleAttr(list) { return list.length ? escapeHtml(list.map(function (x) { return x.full_name; }).join(", ")) : ""; }

      let html = "<span class=\"num\">" + d.getDate() + "</span><div class=\"day-markers\">";
      if (showMarkers) {
        if (dutyList.length) {
          html += "<span class=\"duty-marker\" data-names=\"" + namesAttr(dutyList) + "\" title=\"" + titleAttr(dutyList) + "\" aria-label=\"Дежурные\">Д</span>";
        }
        if (unavailableList.length) {
          html += "<span class=\"unavailable-marker\" data-names=\"" + namesAttr(unavailableList) + "\" title=\"" + titleAttr(unavailableList) + "\" aria-label=\"Недоступен\">Н</span>";
        }
        if (vacationList.length) {
          html += "<span class=\"vacation-marker\" data-names=\"" + namesAttr(vacationList) + "\" title=\"" + titleAttr(vacationList) + "\" aria-label=\"Отпуск\">О</span>";
        }
        if (hasEvent) {
          html += "<button type=\"button\" class=\"info-btn\" aria-label=\"Информация о дне\" data-summary=\"" + escapeHtml(eventSummaries.join("\n")) + "\">i</button>";
        }
      }
      html += "</div>";
      cell.innerHTML = html;
      calendarEl.appendChild(cell);
      d.setDate(d.getDate() + 1);
    }

    monthTitleEl.textContent = MONTHS[month] + " " + year;
    bindInfoButtonTooltips();
    bindDutyMarkerTooltips();
  }

  function positionHint(hintEl, btnRect) {
    var vw = document.documentElement.clientWidth;
    var margin = 12;
    hintEl.classList.remove("below");
    hintEl.style.left = btnRect.left + "px";
    hintEl.style.top = (btnRect.top - 4) + "px";
    hintEl.hidden = false;
    requestAnimationFrame(function () {
      var hintRect = hintEl.getBoundingClientRect();
      var left = parseFloat(hintEl.style.left);
      var top = parseFloat(hintEl.style.top);
      if (hintRect.top < margin) {
        hintEl.classList.add("below");
        top = btnRect.bottom + 4;
      }
      if (hintRect.right > vw - margin) {
        left = vw - hintRect.width - margin;
      }
      if (left < margin) {
        left = margin;
      }
      left = Math.min(left, vw - hintRect.width - margin);
      hintEl.style.left = left + "px";
      hintEl.style.top = top + "px";
      if (hintEl.classList.contains("below")) {
        requestAnimationFrame(function () {
          hintRect = hintEl.getBoundingClientRect();
          left = parseFloat(hintEl.style.left);
          if (hintRect.right > vw - margin) {
            left = vw - hintRect.width - margin;
          }
          if (left < margin) {
            left = margin;
          }
          hintEl.style.left = left + "px";
        });
      }
    });
  }

  function bindInfoButtonTooltips() {
    var hintEl = document.getElementById("calendarEventHint");
    if (!hintEl) {
      hintEl = document.createElement("div");
      hintEl.id = "calendarEventHint";
      hintEl.className = "calendar-event-hint";
      hintEl.setAttribute("role", "tooltip");
      hintEl.hidden = true;
      document.body.appendChild(hintEl);
    }
    calendarEl.querySelectorAll(".info-btn").forEach(function (btn) {
      btn.addEventListener("click", function (e) {
        e.stopPropagation();
        var summary = btn.getAttribute("data-summary") || "";
        if (hintEl.hidden || hintEl.textContent !== summary) {
          hintEl.textContent = summary;
          var rect = btn.getBoundingClientRect();
          positionHint(hintEl, rect);
          hintEl.dataset.active = "1";
        } else {
          hintEl.hidden = true;
          hintEl.removeAttribute("data-active");
        }
      });
    });
    if (!document._calendarHintBound) {
      document._calendarHintBound = true;
      document.addEventListener("click", function () {
        if (hintEl.dataset.active) {
          hintEl.hidden = true;
          hintEl.removeAttribute("data-active");
        }
      });
      document.addEventListener("keydown", function (e) {
        if (e.key === "Escape" && hintEl.dataset.active) {
          hintEl.hidden = true;
          hintEl.removeAttribute("data-active");
        }
      });
    }
  }

  function bindDutyMarkerTooltips() {
    var hintEl = document.getElementById("dutyMarkerHint");
    if (!hintEl) {
      hintEl = document.createElement("div");
      hintEl.id = "dutyMarkerHint";
      hintEl.className = "calendar-event-hint";
      hintEl.setAttribute("role", "tooltip");
      hintEl.hidden = true;
      document.body.appendChild(hintEl);
    }
    var hideTimeout = null;
    var selector = ".duty-marker, .unavailable-marker, .vacation-marker";
    calendarEl.querySelectorAll(selector).forEach(function (marker) {
      marker.addEventListener("mouseenter", function () {
        if (hideTimeout) {
          clearTimeout(hideTimeout);
          hideTimeout = null;
        }
        var names = marker.getAttribute("data-names") || "";
        hintEl.textContent = names;
        var rect = marker.getBoundingClientRect();
        positionHint(hintEl, rect);
        hintEl.hidden = false;
      });
      marker.addEventListener("mouseleave", function () {
        hideTimeout = setTimeout(function () {
          hintEl.hidden = true;
          hideTimeout = null;
        }, 150);
      });
    });
  }

  var EVENT_TYPE_LABELS = { duty: "Дежурство", unavailable: "Недоступен", vacation: "Отпуск" };

  /** Format UTC date from ISO string as DD.MM for display. */
  /** Format date as DD.MM in user's local timezone (for duty card labels). */
  function formatDateKey(isoDateStr) {
    const d = new Date(isoDateStr);
    const day = String(d.getDate()).padStart(2, "0");
    const month = String(d.getMonth() + 1).padStart(2, "0");
    return day + "." + month;
  }

  /** Format YYYY-MM-DD as DD.MM for list header. */
  function dateKeyToDDMM(key) {
    return key.slice(8, 10) + "." + key.slice(5, 7);
  }

  /** Format ISO date as HH:MM in local time. */
  function formatTimeLocal(isoStr) {
    const d = new Date(isoStr);
    return String(d.getHours()).padStart(2, "0") + ":" + String(d.getMinutes()).padStart(2, "0");
  }

  /** Build HTML for one timeline duty card: one-day "DD.MM, HH:MM – HH:MM" or multi-day "DD.MM HH:MM – DD.MM HH:MM". */
  function dutyTimelineCardHtml(d, isCurrent) {
    const startLocal = localDateString(new Date(d.start_at));
    const endLocal = localDateString(new Date(d.end_at));
    const startDDMM = dateKeyToDDMM(startLocal);
    const endDDMM = dateKeyToDDMM(endLocal);
    const startTime = formatTimeLocal(d.start_at);
    const endTime = formatTimeLocal(d.end_at);
    let timeStr;
    if (startLocal === endLocal) {
      timeStr = startDDMM + ", " + startTime + " – " + endTime;
    } else {
      timeStr = startDDMM + " " + startTime + " – " + endDDMM + " " + endTime;
    }
    const typeLabel = isCurrent ? "Сейчас дежурит" : (EVENT_TYPE_LABELS[d.event_type] || "Дежурство");
    const extraClass = isCurrent ? " duty-item--current" : "";
    return "<div class=\"duty-item duty-item--duty duty-timeline-card" + extraClass + "\"><span class=\"duty-item-type\">" + escapeHtml(typeLabel) + "</span> <span class=\"name\">" + escapeHtml(d.full_name) + "</span><div class=\"time\">" + escapeHtml(timeStr) + "</div></div>";
  }

  /** Build HTML for one duty card. @param {object} d - duty. @param {string} [typeLabelOverride] - e.g. "Сейчас дежурит". @param {boolean} [showUntilEnd] - show "до HH:MM" instead of range. @param {string} [extraClass] - e.g. "duty-item--current". */
  function dutyItemHtml(d, typeLabelOverride, showUntilEnd, extraClass) {
    const startDate = new Date(d.start_at);
    const endDate = new Date(d.end_at);
    const typeLabel = typeLabelOverride != null ? typeLabelOverride : (EVENT_TYPE_LABELS[d.event_type] || d.event_type);
    let itemClass = "duty-item duty-item--" + (d.event_type || "duty");
    if (extraClass) itemClass += " " + extraClass;
    let timeOrRange = "";
    if (showUntilEnd && d.event_type === "duty") {
      const end = String(endDate.getHours()).padStart(2, "0") + ":" + String(endDate.getMinutes()).padStart(2, "0");
      timeOrRange = "до " + end;
    } else if (d.event_type === "vacation" || d.event_type === "unavailable") {
      const startStr = formatDateKey(d.start_at);
      const endStr = formatDateKey(d.end_at);
      timeOrRange = startStr === endStr ? startStr : startStr + " – " + endStr;
    } else {
      const start = String(startDate.getHours()).padStart(2, "0") + ":" + String(startDate.getMinutes()).padStart(2, "0");
      const end = String(endDate.getHours()).padStart(2, "0") + ":" + String(endDate.getMinutes()).padStart(2, "0");
      timeOrRange = start + " – " + end;
    }
    return "<div class=\"" + itemClass + "\"><span class=\"duty-item-type\">" + escapeHtml(typeLabel) + "</span> <span class=\"name\">" + escapeHtml(d.full_name) + "</span><div class=\"time\">" + timeOrRange + "</div></div>";
  }

  function renderDutyList(duties) {
    duties = duties.filter(function (d) { return d.event_type === "duty"; });
    if (duties.length === 0) {
      dutyListEl.classList.remove("duty-timeline");
      dutyListEl.innerHTML = "<p class=\"muted\">В этом месяце дежурств нет.</p>";
      return;
    }
    dutyListEl.classList.add("duty-timeline");
    const todayKey = localDateString(new Date());
    const firstKey = localDateString(firstDayOfMonth(current));
    const lastKey = localDateString(lastDayOfMonth(current));
    const showTodayInMonth = todayKey >= firstKey && todayKey <= lastKey;
    const dateSet = new Set();
    duties.forEach(function (d) {
      dateSet.add(localDateString(new Date(d.start_at)));
    });
    if (showTodayInMonth) dateSet.add(todayKey);
    let dates = Array.from(dateSet).sort();
    const now = new Date();
    let fullHtml = "";
    dates.forEach(function (date) {
      const isToday = date === todayKey;
      const dayClass = "duty-timeline-day" + (isToday ? " duty-timeline-day--today" : "");
      const dateLabel = isToday ? "Сегодня, " + dateKeyToDDMM(date) : dateKeyToDDMM(date);
      const dayDuties = duties.filter(function (d) { return localDateString(new Date(d.start_at)) === date; }).sort(function (a, b) { return new Date(a.start_at) - new Date(b.start_at); });
      let dayHtml = "";
      dayDuties.forEach(function (d) {
        const start = new Date(d.start_at);
        const end = new Date(d.end_at);
        const isCurrent = isToday && start <= now && now < end;
        dayHtml += "<div class=\"duty-timeline-row\"><span class=\"duty-timeline-date\">" + escapeHtml(dateLabel) + "</span><div class=\"duty-timeline-card-wrap\">" + dutyTimelineCardHtml(d, isCurrent) + "</div></div>";
      });
      if (dayDuties.length === 0 && isToday) {
        dayHtml += "<div class=\"duty-timeline-row duty-timeline-row--empty\"><span class=\"duty-timeline-date\">" + escapeHtml(dateLabel) + "</span><div class=\"duty-timeline-card-wrap\"></div></div>";
      }
      fullHtml += "<div class=\"" + dayClass + "\" data-date=\"" + escapeHtml(date) + "\">" + dayHtml + "</div>";
    });
    dutyListEl.innerHTML = fullHtml;
    var scrollTarget = dutyListEl.querySelector(".duty-timeline-day--today");
    if (scrollTarget) {
      scrollTarget.scrollIntoView({ behavior: "auto", block: "start" });
    }
  }

  function escapeHtml(s) {
    const div = document.createElement("div");
    div.textContent = s;
    return div.innerHTML;
  }

  /** Group duties by local date (start_at/end_at are UTC). */
  function dutiesByDate(duties) {
    const byDate = {};
    duties.forEach(function (d) {
      const start = new Date(d.start_at);
      const end = new Date(d.end_at);
      const endLocal = localDateString(end);
      let t = new Date(start);
      while (true) {
        const key = localDateString(t);
        if (!byDate[key]) byDate[key] = [];
        byDate[key].push(d);
        if (key === endLocal) break;
        t.setDate(t.getDate() + 1);
      }
    });
    return byDate;
  }

  function showError(msg) {
    errorEl.textContent = msg;
    errorEl.hidden = false;
    loadingEl.classList.add("hidden");
  }

  function runWhenReady(cb) {
    if (window.Telegram && window.Telegram.WebApp) {
      if (window.Telegram.WebApp.ready) {
        window.Telegram.WebApp.ready();
      }
      if (window.Telegram.WebApp.expand) {
        window.Telegram.WebApp.expand();
      }
      applyTheme();
      if (window.Telegram.WebApp.onEvent) {
        window.Telegram.WebApp.onEvent("theme_changed", applyTheme);
      }
      requestAnimationFrame(function () { applyTheme(); });
      setTimeout(cb, 0);
    } else {
      cb();
    }
  }

  /** If allowed (initData or localhost), call onAllowed(); otherwise show access denied. When inside Telegram WebApp but initData is empty, retry once after a short delay (initData may be set asynchronously). */
  function requireTelegramOrLocalhost(onAllowed) {
    var initData = getInitData();
    var isLocal = isLocalhost();
    if (initData) { onAllowed(); return; }
    if (isLocal) { onAllowed(); return; }
    if (window.Telegram && window.Telegram.WebApp) {
      setTimeout(function () {
        initData = getInitData();
        if (initData) { onAllowed(); return; }
        showAccessDenied();
        loadingEl.classList.add("hidden");
      }, RETRY_DELAY_MS);
      return;
    }
    showAccessDenied();
    loadingEl.classList.add("hidden");
  }

  function setNavEnabled(enabled) {
    if (prevBtn) prevBtn.disabled = !enabled;
    if (nextBtn) nextBtn.disabled = !enabled;
  }

  async function loadMonth() {
    hideAccessDenied();
    setNavEnabled(false);
    loadingEl.classList.remove("hidden");
    errorEl.hidden = true;
    const first = firstDayOfMonth(current);
    const start = getMonday(first);
    const gridEnd = new Date(start);
    gridEnd.setDate(gridEnd.getDate() + 41);
    const from = localDateString(start);
    const to = localDateString(gridEnd);
    try {
      const dutiesPromise = fetchDuties(from, to);
      const eventsPromise = fetchCalendarEvents(from, to);
      const duties = await dutiesPromise;
      const events = await eventsPromise;
      const byDate = dutiesByDate(duties);
      const calendarByDate = calendarEventsByDate(events);
      renderCalendar(current.getFullYear(), current.getMonth(), byDate, calendarByDate);
      const last = lastDayOfMonth(current);
      const firstKey = localDateString(first);
      const lastKey = localDateString(last);
      const dutiesInMonth = duties.filter(function (d) {
        const byDateLocal = dutiesByDate([d]);
        return Object.keys(byDateLocal).some(function (key) {
          return key >= firstKey && key <= lastKey;
        });
      });
      lastDutiesForList = dutiesInMonth;
      renderDutyList(dutiesInMonth);
      if (todayRefreshInterval) clearInterval(todayRefreshInterval);
      todayRefreshInterval = null;
      const viewedMonth = current.getFullYear() * 12 + current.getMonth();
      const thisMonth = new Date().getFullYear() * 12 + new Date().getMonth();
      if (viewedMonth === thisMonth) {
        todayRefreshInterval = setInterval(function () {
          if (current.getFullYear() * 12 + current.getMonth() !== new Date().getFullYear() * 12 + new Date().getMonth()) return;
          renderDutyList(lastDutiesForList);
        }, 60000);
      }
    } catch (e) {
      if (e.message === "ACCESS_DENIED") {
        showAccessDenied(e.serverDetail);
        setNavEnabled(true);
        if (window.Telegram && window.Telegram.WebApp && !window._initDataRetried) {
          window._initDataRetried = true;
          setTimeout(loadMonth, RETRY_AFTER_ACCESS_DENIED_MS);
        }
        return;
      }
      showError(e.message || "Не удалось загрузить данные.");
      setNavEnabled(true);
      return;
    }
    loadingEl.classList.add("hidden");
    setNavEnabled(true);
  }

  document.getElementById("prevMonth").addEventListener("click", function () {
    if (!accessDeniedEl.hidden) return;
    current.setMonth(current.getMonth() - 1);
    loadMonth();
  });
  document.getElementById("nextMonth").addEventListener("click", function () {
    if (!accessDeniedEl.hidden) return;
    current.setMonth(current.getMonth() + 1);
    loadMonth();
  });

  (function bindSwipeMonth() {
    var swipeEl = document.getElementById("calendarSticky");
    if (!swipeEl) return;
    var startX = 0;
    var startY = 0;
    var SWIPE_THRESHOLD = 50;
    swipeEl.addEventListener("touchstart", function (e) {
      if (e.changedTouches.length === 0) return;
      var t = e.changedTouches[0];
      startX = t.clientX;
      startY = t.clientY;
    }, { passive: true });
    swipeEl.addEventListener("touchend", function (e) {
      if (e.changedTouches.length === 0) return;
      if (!accessDeniedEl.hidden) return;
      if (prevBtn.disabled) return;
      var t = e.changedTouches[0];
      var deltaX = t.clientX - startX;
      var deltaY = t.clientY - startY;
      if (Math.abs(deltaX) <= SWIPE_THRESHOLD) return;
      if (Math.abs(deltaY) > Math.abs(deltaX)) return;
      if (deltaX > SWIPE_THRESHOLD) {
        current.setMonth(current.getMonth() - 1);
        loadMonth();
      } else if (deltaX < -SWIPE_THRESHOLD) {
        current.setMonth(current.getMonth() + 1);
        loadMonth();
      }
    }, { passive: true });
  })();

  function bindStickyScrollShadow() {
    var stickyEl = document.getElementById("calendarSticky");
    if (!stickyEl || document._stickyScrollBound) return;
    document._stickyScrollBound = true;
    function updateScrolled() {
      stickyEl.classList.toggle("is-scrolled", window.scrollY > 0);
    }
    window.addEventListener("scroll", updateScrolled, { passive: true });
    updateScrolled();
  }

  runWhenReady(function () {
    requireTelegramOrLocalhost(function () {
      bindStickyScrollShadow();
      loadMonth();
    });
  });
})();