/* ============================================
   移动端日历提醒 - 核心逻辑
   对标 RN App (apps/app_calendar_reminder)
   纯 JS + IIFE 模块化，所有时间按北京时间处理
   ============================================ */
(function () {
  'use strict';

  /* ------------------------------------------
     常量与全局状态
     ------------------------------------------ */
  const API_BASE = '/api/app_calendar/events'; // 同域部署，相对路径
  const WINDOW_MS = 2 * 60 * 1000;             // 2 分钟补偿窗口
  const REQUEST_TIMEOUT = 10000;               // 请求超时 10s
  const WEEKDAY_NAMES = ['周一', '周二', '周三', '周四', '周五', '周六', '周日'];

  const state = {
    events: [],              // 已加载事件（去重、过滤 deleted 后）
    currentTab: 'today',     // 当前 Tab：today / calendar
    calYear: 0,              // 日历当前年
    calMonth: 0,             // 日历当前月（0-based）
    selectedDate: null,      // 日历选中日期
    editingEvent: null,      // 正在编辑的事件（null 表示新建）
    deletingEvent: null,     // 待删除事件
    notifiedKeys: new Set(), // 已提醒防重复
    scheduledTimers: [],     // 预调度 setTimeout 句柄
    heartbeatTimer: null,    // 心跳巡检句柄
  };

  // 编辑表单的循环规则状态
  const form = {
    recurrenceType: 'NONE', // NONE / DAILY / WEEKLY
    interval: 1,
    weekdays: [],           // 1~7（1=周一，7=周日）
  };

  // 简易选择器
  function $(sel) { return document.querySelector(sel); }

  /* ------------------------------------------
     工具函数：日期解析与格式化
     ------------------------------------------ */

  // 安全日期解析（兼容 ISO、yyyy-MM-dd HH:mm、yyyy-MM-ddTHH:mm）
  function safeParseDate(dateStr) {
    if (!dateStr) return new Date();
    try {
      const d = new Date(dateStr);
      if (!isNaN(d.getTime())) return d;
    } catch (e) { /* 忽略 */ }
    // yyyy-MM-dd HH:mm → 替换空格为 T
    if (String(dateStr).includes(' ')) {
      try {
        const d = new Date(String(dateStr).replace(' ', 'T'));
        if (!isNaN(d.getTime())) return d;
      } catch (e) { /* 忽略 */ }
    }
    // 兜底：仅解析日期部分
    const match = String(dateStr).match(/(\d{4})-(\d{2})-(\d{2})/);
    if (match) {
      return new Date(parseInt(match[1], 10), parseInt(match[2], 10) - 1, parseInt(match[3], 10));
    }
    return new Date();
  }

  // 本地日期字符串 yyyy-MM-dd（北京时间）
  function formatDateStr(date) {
    const pad = (n) => String(n).padStart(2, '0');
    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}`;
  }

  // Date → datetime-local 输入值（yyyy-MM-ddTHH:mm，本地时间）
  function toDatetimeLocalValue(date) {
    const pad = (n) => String(n).padStart(2, '0');
    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}T${pad(date.getHours())}:${pad(date.getMinutes())}`;
  }

  // 15 分钟粒度对齐
  function snapTo15(date) {
    const d = new Date(date);
    d.setMinutes(Math.round(d.getMinutes() / 15) * 15, 0, 0);
    return d;
  }

  // 是否同一天
  function isSameDay(a, b) {
    return a.getFullYear() === b.getFullYear() &&
      a.getMonth() === b.getMonth() &&
      a.getDate() === b.getDate();
  }

  // 事件时间展示（HH:mm）
  function formatTime(dateStr) {
    return safeParseDate(dateStr).toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit' });
  }

  /* ------------------------------------------
     循环规则解析与判断（与 RN recurrence.ts 一致）
     ------------------------------------------ */

  // 解析循环规则字符串：DAILY;interval=N / WEEKLY;interval=N;by=1,3,5
  function parseRecurrenceStr(str) {
    const r = (str || '').trim();
    if (!r) return { type: 'NONE', interval: 0, by: [] };
    const type = r.startsWith('DAILY') ? 'DAILY' : (r.startsWith('WEEKLY') ? 'WEEKLY' : 'NONE');
    const mInt = /interval=(\d+)/.exec(r);
    const interval = mInt ? Math.max(1, parseInt(mInt[1], 10)) : 1;
    const mBy = /by=([0-9,]+)/.exec(r);
    const by = mBy ? mBy[1].split(',').map((s) => parseInt(s, 10)).filter((n) => n >= 1 && n <= 7) : [];
    return { type, interval, by };
  }

  // 循环规则中文描述（如「每2周 周一、周三」）
  function getRecurrenceLabel(recurrence) {
    if (!recurrence) return null;
    const rec = parseRecurrenceStr(recurrence);
    if (rec.type === 'DAILY') {
      return rec.interval === 1 ? '每天' : `每${rec.interval}天`;
    }
    if (rec.type === 'WEEKLY') {
      const prefix = rec.interval === 1 ? '每周' : `每${rec.interval}周`;
      if (rec.by.length > 0) {
        return `${prefix} ${rec.by.map((d) => WEEKDAY_NAMES[d - 1] || '').join('、')}`;
      }
      return prefix;
    }
    return null;
  }

  // 判断事件在目标日期是否展示（与 RN shouldShowEventOnDate 逻辑一致）
  function shouldShowEventOnDate(event, targetDate) {
    const evStart = safeParseDate(event.start);
    const eventDateStr = formatDateStr(evStart);
    const targetDateStr = formatDateStr(targetDate);

    // 1. 普通事件：开始日期就是当天
    if (eventDateStr === targetDateStr) return true;

    const targetDayStart = new Date(targetDate.getFullYear(), targetDate.getMonth(), targetDate.getDate());
    const eventStartDay = new Date(evStart.getFullYear(), evStart.getMonth(), evStart.getDate());

    // 2. 持续多天事件：目标日期在 [start, end] 之间
    if (event.end) {
      const evEnd = safeParseDate(event.end);
      const eventEndDay = new Date(evEnd.getFullYear(), evEnd.getMonth(), evEnd.getDate());
      if (targetDayStart >= eventStartDay && targetDayStart <= eventEndDay) return true;
    }

    // 3. 循环事件
    const rec = parseRecurrenceStr(event.recurrence);
    if (rec.type === 'NONE') return false;

    // 目标日期早于开始日期，不展示
    if (targetDayStart < eventStartDay) return false;

    // 有结束日期且目标日期晚于结束日期，不展示
    if (event.end) {
      const evEnd = safeParseDate(event.end);
      const eventEndDay = new Date(evEnd.getFullYear(), evEnd.getMonth(), evEnd.getDate());
      if (targetDayStart > eventEndDay) return false;
    }

    if (rec.type === 'DAILY') {
      const diffDays = Math.floor((targetDayStart.getTime() - eventStartDay.getTime()) / (24 * 3600 * 1000));
      return diffDays % rec.interval === 0;
    }

    if (rec.type === 'WEEKLY') {
      const weeksSinceStart = Math.floor((targetDayStart.getTime() - eventStartDay.getTime()) / (7 * 24 * 3600 * 1000));
      const weekday = targetDayStart.getDay() === 0 ? 7 : targetDayStart.getDay();
      const by = rec.by.length ? rec.by : [(evStart.getDay() || 7)];
      return by.includes(weekday) && (weeksSinceStart % rec.interval === 0);
    }

    return false;
  }

  // 将 timeSourceIso 的时分套用到 dateObj 上，返回 ISO 字符串
  function setTimeFromIso(dateObj, timeSourceIso) {
    const d = new Date(dateObj.getTime());
    const t = timeSourceIso ? safeParseDate(timeSourceIso) : null;
    d.setHours(t ? t.getHours() : 0, t ? t.getMinutes() : 0, 0, 0);
    return d.toISOString();
  }

  // 计算事件在 [sinceMs, untilMs] 时间窗内的提醒时刻（与 RN computeUpcomingReminders 一致）
  function computeUpcomingReminders(e, sinceMs, untilMs) {
    const rec = parseRecurrenceStr(e.recurrence || null);
    const evStart = safeParseDate(e.start);
    const reminders = [];

    // 非循环事件：直接判断 remindAt 或 start
    if (rec.type === 'NONE') {
      const iso = e.remindAt || e.start;
      if (!iso) return reminders;
      const t = safeParseDate(iso).getTime();
      if (t >= sinceMs && t <= untilMs) reminders.push(iso);
      return reminders;
    }

    const startDayMs = new Date(evStart.getFullYear(), evStart.getMonth(), evStart.getDate()).getTime();
    const ws = new Date(sinceMs);
    const we = new Date(untilMs);
    const windowStartDayMs = new Date(ws.getFullYear(), ws.getMonth(), ws.getDate()).getTime();
    const windowEndDayMs = new Date(we.getFullYear(), we.getMonth(), we.getDate()).getTime();

    let endDayMs;
    if (e.end) {
      const evEnd = safeParseDate(e.end);
      endDayMs = new Date(evEnd.getFullYear(), evEnd.getMonth(), evEnd.getDate()).getTime();
    } else {
      endDayMs = windowEndDayMs; // 无结束日期时用窗口边界，避免提前终止
    }

    const fromDay = Math.max(startDayMs, windowStartDayMs);
    const toDay = Math.min(endDayMs, windowEndDayMs);
    const timeSourceIso = e.remindAt || e.start;

    // 安全截断：最多遍历 400 天，防死循环
    let guard = 0;
    for (let d = fromDay; d <= toDay && guard < 400; d += 24 * 3600 * 1000, guard++) {
      const cursor = new Date(d);
      if (rec.type === 'DAILY') {
        const diffDays = Math.floor((d - startDayMs) / (24 * 3600 * 1000));
        if (diffDays % rec.interval === 0) {
          const iso = setTimeFromIso(cursor, timeSourceIso);
          const t = safeParseDate(iso).getTime();
          if (t >= sinceMs && t <= untilMs) reminders.push(iso);
        }
      } else if (rec.type === 'WEEKLY') {
        const weekday = cursor.getDay() === 0 ? 7 : cursor.getDay();
        const weeksSinceStart = Math.floor((d - startDayMs) / (7 * 24 * 3600 * 1000));
        const by = rec.by.length ? rec.by : [(safeParseDate(e.start).getDay() || 7)];
        if (by.includes(weekday) && (weeksSinceStart % rec.interval === 0)) {
          const iso = setTimeFromIso(cursor, timeSourceIso);
          const t = safeParseDate(iso).getTime();
          if (t >= sinceMs && t <= untilMs) reminders.push(iso);
        }
      }
    }
    return reminders;
  }

  /* ------------------------------------------
     API 层
     ------------------------------------------ */

  // 统一请求封装（含超时与错误处理）
  async function apiRequest(url, options) {
    const controller = new AbortController();
    const timer = setTimeout(() => controller.abort(), REQUEST_TIMEOUT);
    try {
      const resp = await fetch(url, Object.assign({
        signal: controller.signal,
        headers: { 'Content-Type': 'application/json' },
      }, options));
      if (!resp.ok) throw new Error(`服务器响应 ${resp.status}`);
      const json = await resp.json();
      if (json && json.ok === false) throw new Error(json.error || '请求失败');
      return json;
    } catch (e) {
      if (e.name === 'AbortError') throw new Error('请求超时，请稍后重试');
      throw e;
    } finally {
      clearTimeout(timer);
    }
  }

  // 按月查询
  async function apiGetEventsMonth(year, month) {
    const json = await apiRequest(`${API_BASE}?year=${year}&month=${month}`);
    return (json && json.data) || [];
  }

  // 加载前 6 月 + 当月 + 后 1 月数据，按 id 去重，过滤已删除
  async function loadAllEvents() {
    const now = new Date();
    const all = [];
    const seen = new Set();
    for (let i = -6; i <= 1; i++) {
      const d = new Date(now.getFullYear(), now.getMonth() + i, 1);
      const year = d.getFullYear();
      const month = d.getMonth() + 1;
      try {
        const monthEvents = await apiGetEventsMonth(year, month);
        for (const ev of monthEvents) {
          if (!seen.has(ev.id)) {
            seen.add(ev.id);
            all.push(ev);
          }
        }
      } catch (e) {
        // 单月失败不阻断整体加载
        console.error('加载月份数据失败', year, month, e);
      }
    }
    state.events = all.filter((e) => !e.deleted);
  }

  async function apiCreateEvent(data) {
    await apiRequest(API_BASE, { method: 'POST', body: JSON.stringify(data) });
  }

  async function apiUpdateEvent(id, data) {
    await apiRequest(`${API_BASE}?id=${encodeURIComponent(id)}`, {
      method: 'PUT',
      body: JSON.stringify(Object.assign({}, data, { id })),
    });
  }

  async function apiDeleteEvent(id) {
    await apiRequest(`${API_BASE}?id=${encodeURIComponent(id)}`, { method: 'DELETE' });
  }

  /* ------------------------------------------
     Toast 提示
     ------------------------------------------ */
  let toastTimer = null;
  function showToast(msg, type) {
    const toast = $('#toast');
    toast.textContent = msg;
    toast.className = 'toast ' + (type || 'info');
    void toast.offsetWidth; // 强制 reflow 重启动画
    toast.classList.add('visible');
    if (toastTimer) clearTimeout(toastTimer);
    toastTimer = setTimeout(() => toast.classList.remove('visible'), 2000);
  }

  /* ------------------------------------------
     事件卡片
     ------------------------------------------ */
  function createEventCard(ev) {
    const card = document.createElement('div');
    card.className = 'event-card' + (ev.completed ? ' completed' : '');

    // 圆形 checkbox
    const checkbox = document.createElement('div');
    checkbox.className = 'event-checkbox' + (ev.completed ? ' checked' : '');
    checkbox.addEventListener('click', (e) => { e.stopPropagation(); toggleComplete(ev); });

    // 主体（点击编辑）
    const body = document.createElement('div');
    body.className = 'event-body';

    const title = document.createElement('div');
    title.className = 'event-title';
    title.textContent = ev.title;
    body.appendChild(title);

    if (ev.content) {
      const content = document.createElement('div');
      content.className = 'event-content';
      content.textContent = ev.content;
      body.appendChild(content);
    }

    const meta = document.createElement('div');
    meta.className = 'event-meta';
    const timeSpan = document.createElement('span');
    timeSpan.textContent = '🕐 ' + formatTime(ev.start);
    meta.appendChild(timeSpan);
    const recLabel = getRecurrenceLabel(ev.recurrence);
    if (recLabel) {
      const recSpan = document.createElement('span');
      recSpan.className = 'recurrence-label';
      recSpan.textContent = '🔁 ' + recLabel;
      meta.appendChild(recSpan);
    }
    body.appendChild(meta);
    body.addEventListener('click', () => openModal(ev));

    // 删除按钮
    const del = document.createElement('div');
    del.className = 'event-delete';
    del.textContent = '🗑';
    del.addEventListener('click', (e) => { e.stopPropagation(); openDeleteSheet(ev); });

    card.appendChild(checkbox);
    card.appendChild(body);
    card.appendChild(del);
    return card;
  }

  /* ------------------------------------------
     今日视图
     ------------------------------------------ */
  function renderTodayView() {
    const today = new Date();
    const hour = today.getHours();
    const greeting = hour < 12 ? '早上好' : (hour < 18 ? '下午好' : '晚上好');
    $('#greeting').textContent = greeting + ' 👋';
    $('#today-date').textContent = today.toLocaleDateString('zh-CN', {
      year: 'numeric', month: 'long', day: 'numeric',
    });

    const todayEvents = state.events
      .filter((ev) => shouldShowEventOnDate(ev, today))
      .sort((a, b) => safeParseDate(a.start).getTime() - safeParseDate(b.start).getTime());

    const pending = todayEvents.filter((e) => !e.completed);
    const completed = todayEvents.filter((e) => e.completed);

    $('#stat-pending').textContent = pending.length;
    $('#stat-completed').textContent = completed.length;
    $('#stat-total').textContent = todayEvents.length;

    const list = $('#today-list');
    list.innerHTML = '';
    pending.forEach((ev) => list.appendChild(createEventCard(ev)));
    $('#today-empty').classList.toggle('hidden', pending.length > 0);
  }

  /* ------------------------------------------
     日历视图
     ------------------------------------------ */

  // 生成 6x7=42 格月历数据
  function getDaysInMonth(year, month) {
    const firstDay = new Date(year, month, 1);
    const lastDay = new Date(year, month + 1, 0);
    const days = [];
    const prevMonthLastDay = new Date(year, month, 0).getDate();
    for (let i = firstDay.getDay() - 1; i >= 0; i--) {
      days.push({ date: new Date(year, month - 1, prevMonthLastDay - i), isCurrentMonth: false });
    }
    for (let i = 1; i <= lastDay.getDate(); i++) {
      days.push({ date: new Date(year, month, i), isCurrentMonth: true });
    }
    const remaining = 42 - days.length;
    for (let i = 1; i <= remaining; i++) {
      days.push({ date: new Date(year, month + 1, i), isCurrentMonth: false });
    }
    return days;
  }

  function hasEventOnDate(date) {
    return state.events.some((ev) => shouldShowEventOnDate(ev, date));
  }

  function renderCalendar() {
    $('#cal-month-title').textContent = `${state.calYear}年${state.calMonth + 1}月`;

    const grid = $('#calendar-grid');
    grid.innerHTML = '';
    const days = getDaysInMonth(state.calYear, state.calMonth);
    const today = new Date();

    days.forEach(({ date, isCurrentMonth }) => {
      const cell = document.createElement('div');
      cell.className = 'day-cell';
      if (!isCurrentMonth) cell.classList.add('other-month');
      if (isSameDay(date, today)) cell.classList.add('today');
      if (state.selectedDate && isSameDay(date, state.selectedDate)) cell.classList.add('selected');

      const num = document.createElement('div');
      num.className = 'day-number';
      num.textContent = date.getDate();
      cell.appendChild(num);

      if (hasEventOnDate(date)) {
        const dot = document.createElement('div');
        dot.className = 'event-dot';
        cell.appendChild(dot);
      }

      cell.addEventListener('click', () => {
        state.selectedDate = date;
        renderCalendar();
        renderCalendarEvents();
      });
      grid.appendChild(cell);
    });

    if (state.selectedDate) {
      $('#cal-no-date').classList.add('hidden');
      $('#cal-events-section').classList.remove('hidden');
    } else {
      $('#cal-no-date').classList.remove('hidden');
      $('#cal-events-section').classList.add('hidden');
    }
  }

  function renderCalendarEvents() {
    if (!state.selectedDate) return;
    const d = state.selectedDate;
    $('#cal-selected-title').textContent = d.toLocaleDateString('zh-CN', {
      month: 'long', day: 'numeric', weekday: 'long',
    });

    const events = state.events
      .filter((ev) => shouldShowEventOnDate(ev, d))
      .sort((a, b) => safeParseDate(a.start).getTime() - safeParseDate(b.start).getTime());

    const list = $('#cal-events-list');
    list.innerHTML = '';
    events.forEach((ev) => list.appendChild(createEventCard(ev)));
    $('#cal-events-empty').classList.toggle('hidden', events.length > 0);
  }

  function renderCurrentView() {
    if (state.currentTab === 'today') {
      renderTodayView();
    } else {
      renderCalendar();
      renderCalendarEvents();
    }
  }

  /* ------------------------------------------
     完成状态切换
     ------------------------------------------ */
  async function toggleComplete(ev) {
    try {
      await apiUpdateEvent(ev.id, { completed: !ev.completed });
      await loadAllEvents();
      renderCurrentView();
      scheduleReminders();
    } catch (e) {
      showToast(e.message || '更新失败', 'error');
    }
  }

  /* ------------------------------------------
     事件编辑弹窗
     ------------------------------------------ */
  function updateRecurrenceUI() {
    document.querySelectorAll('.recurrence-btn').forEach((btn) => {
      btn.classList.toggle('active', btn.dataset.type === form.recurrenceType);
    });
    const isNone = form.recurrenceType === 'NONE';
    $('#field-interval').classList.toggle('hidden', isNone);
    $('#field-weekdays').classList.toggle('hidden', form.recurrenceType !== 'WEEKLY');
    $('#interval-value').textContent = form.interval;
    $('#interval-label').textContent = `每 ${form.interval} ${form.recurrenceType === 'DAILY' ? '天' : '周'}`;
    document.querySelectorAll('.weekday-btn').forEach((btn) => {
      btn.classList.toggle('active', form.weekdays.includes(parseInt(btn.dataset.day, 10)));
    });
  }

  function toggleRemindField() {
    $('#field-remind').classList.toggle('hidden', !$('#f-remind-enable').checked);
  }

  // 回填 / 重置表单
  function fillForm(ev) {
    if (ev) {
      $('#f-title').value = ev.title || '';
      $('#f-content').value = ev.content || '';
      $('#f-allday').checked = !!ev.allDay;
      $('#f-start').value = toDatetimeLocalValue(safeParseDate(ev.start));
      if (ev.end) {
        $('#f-end').value = toDatetimeLocalValue(safeParseDate(ev.end));
        $('#f-end-clear').classList.remove('hidden');
      } else {
        $('#f-end').value = '';
        $('#f-end-clear').classList.add('hidden');
      }
      const hasRemind = !!ev.remindAt;
      $('#f-remind-enable').checked = hasRemind;
      $('#f-remind').value = toDatetimeLocalValue(hasRemind ? safeParseDate(ev.remindAt) : snapTo15(new Date()));

      const rec = parseRecurrenceStr(ev.recurrence);
      form.recurrenceType = rec.type === 'NONE' ? 'NONE' : rec.type;
      form.interval = rec.interval || 1;
      form.weekdays = rec.by.slice();
    } else {
      $('#f-title').value = '';
      $('#f-content').value = '';
      $('#f-allday').checked = false;
      $('#f-start').value = toDatetimeLocalValue(snapTo15(new Date()));
      $('#f-end').value = '';
      $('#f-end-clear').classList.add('hidden');
      $('#f-remind-enable').checked = true;
      $('#f-remind').value = toDatetimeLocalValue(snapTo15(new Date()));
      form.recurrenceType = 'NONE';
      form.interval = 1;
      form.weekdays = [];
    }
    toggleRemindField();
    updateRecurrenceUI();
  }

  function openModal(ev) {
    state.editingEvent = ev || null;
    $('#modal-title').textContent = ev ? '编辑事件' : '新建事件';
    fillForm(ev);
    $('#modal-overlay').classList.add('visible');
  }

  function closeModal() {
    $('#modal-overlay').classList.remove('visible');
    state.editingEvent = null;
  }

  // 收集表单并保存
  async function handleSave() {
    const title = $('#f-title').value.trim();
    if (!title) { showToast('请输入标题', 'error'); return; }

    const allDay = $('#f-allday').checked;
    const startVal = $('#f-start').value;
    if (!startVal) { showToast('请设置开始时间', 'error'); return; }

    const startDate = snapTo15(new Date(startVal));

    // 结束时间自动补全：未设置时 +1h（全天则 +24h）
    let endDate;
    const endVal = $('#f-end').value;
    if (endVal) {
      endDate = snapTo15(new Date(endVal));
    } else {
      endDate = new Date(startDate.getTime() + (allDay ? 24 : 1) * 3600 * 1000);
    }

    // 提醒
    let remindAt = null;
    if ($('#f-remind-enable').checked) {
      const remindVal = $('#f-remind').value;
      remindAt = remindVal ? snapTo15(new Date(remindVal)).toISOString() : startDate.toISOString();
    }

    // 组装循环规则
    let recurrence = null;
    if (form.recurrenceType === 'DAILY') {
      recurrence = `DAILY;interval=${form.interval}`;
    } else if (form.recurrenceType === 'WEEKLY') {
      recurrence = `WEEKLY;interval=${form.interval}`;
      if (form.weekdays.length > 0) {
        recurrence += `;by=${form.weekdays.slice().sort((a, b) => a - b).join(',')}`;
      }
    }

    const eventData = {
      title,
      content: $('#f-content').value.trim(),
      start: startDate.toISOString(),
      end: endDate.toISOString(),
      allDay,
      remindAt,
      recurrence,
      completed: state.editingEvent ? !!state.editingEvent.completed : false,
    };

    const saveBtn = $('#modal-save');
    saveBtn.disabled = true;
    saveBtn.textContent = '保存中…';

    try {
      if (state.editingEvent) {
        await apiUpdateEvent(state.editingEvent.id, eventData);
        showToast('事件已更新', 'success');
      } else {
        eventData.createdAt = new Date().toISOString();
        eventData.updatedAt = new Date().toISOString();
        eventData.deleted = false;
        await apiCreateEvent(eventData);
        showToast('事件已创建', 'success');
      }
      closeModal();
      await loadAllEvents();
      renderCurrentView();
      scheduleReminders();
    } catch (e) {
      showToast(e.message || '保存失败', 'error');
    } finally {
      saveBtn.disabled = false;
      saveBtn.textContent = '保存';
    }
  }

  /* ------------------------------------------
     删除确认 ActionSheet
     ------------------------------------------ */
  function openDeleteSheet(ev) {
    state.deletingEvent = ev;
    $('#delete-sheet-overlay').classList.add('visible');
  }

  function closeDeleteSheet() {
    $('#delete-sheet-overlay').classList.remove('visible');
    state.deletingEvent = null;
  }

  async function handleDelete() {
    const ev = state.deletingEvent;
    if (!ev) return;
    const btn = $('#delete-confirm');
    btn.disabled = true;
    btn.textContent = '删除中…';
    try {
      await apiDeleteEvent(ev.id);
      showToast('事件已删除', 'success');
      closeDeleteSheet();
      await loadAllEvents();
      renderCurrentView();
      scheduleReminders();
    } catch (e) {
      showToast(e.message || '删除失败', 'error');
    } finally {
      btn.disabled = false;
      btn.textContent = '确认删除';
    }
  }

  /* ------------------------------------------
     提醒通知
     ------------------------------------------ */
  function requestNotificationPermission() {
    if (!('Notification' in window)) return;
    if (Notification.permission === 'default') {
      Notification.requestPermission();
    }
  }

  function triggerNotify(ev) {
    // 浏览器系统通知
    if ('Notification' in window && Notification.permission === 'granted') {
      try {
        new Notification('提醒', { body: ev.title });
      } catch (e) {
        console.error('通知发送失败', e);
      }
    }
    // 前台 Toast 兜底
    showToast('提醒：' + ev.title, 'info');
  }

  // 补偿过去 2 分钟内到期的提醒
  function catchUpNotifications(now) {
    const since = now - WINDOW_MS;
    state.events.forEach((e) => {
      if (e.completed || e.deleted) return;
      const windowReminders = computeUpcomingReminders(e, since, now);
      windowReminders.forEach((remindIso) => {
        const key = `${e.id}|${remindIso}`;
        if (!state.notifiedKeys.has(key)) {
          triggerNotify(e);
          state.notifiedKeys.add(key);
        }
      });
    });
  }

  // 预调度未来 24h 提醒 + 补偿窗口
  function scheduleReminders() {
    state.scheduledTimers.forEach((t) => clearTimeout(t));
    state.scheduledTimers = [];

    const now = Date.now();
    const next24h = now + 24 * 3600 * 1000;

    catchUpNotifications(now);

    state.events.forEach((e) => {
      if (e.completed || e.deleted) return;
      const upcoming = computeUpcomingReminders(e, now, next24h);
      upcoming.forEach((remindIso) => {
        const ts = safeParseDate(remindIso).getTime();
        const delay = ts - now;
        if (delay <= 0) return;
        const key = `${e.id}|${remindIso}`;
        if (state.notifiedKeys.has(key)) return;
        const timer = setTimeout(() => {
          if (!state.notifiedKeys.has(key)) {
            triggerNotify(e);
            state.notifiedKeys.add(key);
          }
        }, delay);
        state.scheduledTimers.push(timer);
      });
    });
  }

  // 60 秒心跳巡检，捕捉休眠/时间漂移导致的遗漏
  function startHeartbeat() {
    if (state.heartbeatTimer) clearInterval(state.heartbeatTimer);
    state.heartbeatTimer = setInterval(() => {
      const now = Date.now();
      const since = now - WINDOW_MS;
      state.events.forEach((e) => {
        if (e.completed || e.deleted) return;
        const windowReminders = computeUpcomingReminders(e, since, now);
        windowReminders.forEach((remindIso) => {
          const key = `${e.id}|${remindIso}`;
          if (!state.notifiedKeys.has(key)) {
            triggerNotify(e);
            state.notifiedKeys.add(key);
          }
        });
      });
    }, 60 * 1000);
  }

  /* ------------------------------------------
     Tab 切换
     ------------------------------------------ */
  function switchTab(tab) {
    state.currentTab = tab;
    document.querySelectorAll('.tab-item').forEach((t) => {
      t.classList.toggle('active', t.dataset.tab === tab);
    });
    $('#view-today').classList.toggle('active', tab === 'today');
    $('#view-calendar').classList.toggle('active', tab === 'calendar');
    renderCurrentView();
  }

  /* ------------------------------------------
     事件绑定
     ------------------------------------------ */
  function bindEvents() {
    // Tab 导航
    document.querySelectorAll('.tab-item').forEach((t) => {
      t.addEventListener('click', () => switchTab(t.dataset.tab));
    });

    // FAB 新增
    $('#fab-add').addEventListener('click', () => openModal(null));

    // 日历月份切换
    $('#cal-prev').addEventListener('click', () => {
      const d = new Date(state.calYear, state.calMonth - 1, 1);
      state.calYear = d.getFullYear();
      state.calMonth = d.getMonth();
      state.selectedDate = null;
      renderCalendar();
    });
    $('#cal-next').addEventListener('click', () => {
      const d = new Date(state.calYear, state.calMonth + 1, 1);
      state.calYear = d.getFullYear();
      state.calMonth = d.getMonth();
      state.selectedDate = null;
      renderCalendar();
    });

    // 选中日期旁的新增按钮
    $('#cal-add-btn').addEventListener('click', () => openModal(null));

    // 弹窗关闭 / 保存
    $('#modal-close').addEventListener('click', closeModal);
    $('#modal-save').addEventListener('click', handleSave);
    $('#modal-overlay').addEventListener('click', (e) => {
      if (e.target === $('#modal-overlay')) closeModal();
    });

    // 结束时间清除
    $('#f-end').addEventListener('input', () => {
      $('#f-end-clear').classList.toggle('hidden', !$('#f-end').value);
    });
    $('#f-end-clear').addEventListener('click', () => {
      $('#f-end').value = '';
      $('#f-end-clear').classList.add('hidden');
    });

    // 提醒开关
    $('#f-remind-enable').addEventListener('change', toggleRemindField);

    // 重复类型按钮组
    document.querySelectorAll('.recurrence-btn').forEach((btn) => {
      btn.addEventListener('click', () => {
        form.recurrenceType = btn.dataset.type;
        updateRecurrenceUI();
      });
    });

    // 循环间隔 +/-
    $('#interval-minus').addEventListener('click', () => {
      form.interval = Math.max(1, form.interval - 1);
      updateRecurrenceUI();
    });
    $('#interval-plus').addEventListener('click', () => {
      form.interval = form.interval + 1;
      updateRecurrenceUI();
    });

    // 每周星期勾选
    document.querySelectorAll('.weekday-btn').forEach((btn) => {
      btn.addEventListener('click', () => {
        const day = parseInt(btn.dataset.day, 10);
        if (form.weekdays.includes(day)) {
          form.weekdays = form.weekdays.filter((d) => d !== day);
        } else {
          form.weekdays = form.weekdays.concat(day).sort((a, b) => a - b);
        }
        updateRecurrenceUI();
      });
    });

    // 删除确认
    $('#delete-confirm').addEventListener('click', handleDelete);
    $('#delete-cancel').addEventListener('click', closeDeleteSheet);
    $('#delete-sheet-overlay').addEventListener('click', (e) => {
      if (e.target === $('#delete-sheet-overlay')) closeDeleteSheet();
    });
  }

  /* ------------------------------------------
     初始化
     ------------------------------------------ */
  function init() {
    const now = new Date();
    state.calYear = now.getFullYear();
    state.calMonth = now.getMonth();

    bindEvents();
    requestNotificationPermission();

    // 初始加载数据
    $('#today-loading').classList.remove('hidden');
    loadAllEvents().then(() => {
      $('#today-loading').classList.add('hidden');
      renderCurrentView();
      scheduleReminders();
      startHeartbeat();
    }).catch((err) => {
      $('#today-loading').classList.add('hidden');
      showToast(err.message || '加载失败', 'error');
    });

    // 回前台重新加载并调度（对应 RN 的 AppState active）
    document.addEventListener('visibilitychange', () => {
      if (document.visibilityState === 'visible') {
        loadAllEvents().then(() => {
          renderCurrentView();
          scheduleReminders();
        }).catch(() => { /* 静默失败 */ });
      }
    });
  }

  // 启动
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();