const axios = require('axios');

const API_BASE_URL = 'http://47.101.56.101:8976/api/app_calendar';

// 复制 recurrence 相关函数
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 };
}

function extractDateStr(dateStr) {
  if (dateStr.includes('T')) {
    return dateStr.split('T')[0];
  }
  if (dateStr.includes(' ')) {
    return dateStr.split(' ')[0];
  }
  return dateStr;
}

function safeParseDate(dateStr) {
  try {
    let date = new Date(dateStr);
    if (!isNaN(date.getTime())) {
      return date;
    }
  } catch (e) {}
  
  if (dateStr.includes(' ')) {
    try {
      let date = new Date(dateStr.replace(' ', 'T'));
      if (!isNaN(date.getTime())) {
        return date;
      }
    } catch (e) {}
  }
  
  const match = dateStr.match(/(\d{4})-(\d{2})-(\d{2})/);
  if (match) {
    const year = parseInt(match[1], 10);
    const month = parseInt(match[2], 10) - 1;
    const day = parseInt(match[3], 10);
    return new Date(year, month, day);
  }
  
  return new Date();
}

function shouldShowEventOnDate(event, targetDate) {
  const eventDate = extractDateStr(event.start);
  const targetDateStr = targetDate.toISOString().split('T')[0];
  
  if (eventDate === targetDateStr) return true;
  
  const evStart = safeParseDate(event.start);
  const targetDayStart = new Date(targetDate.getFullYear(), targetDate.getMonth(), targetDate.getDate());
  const eventStartDay = new Date(evStart.getFullYear(), evStart.getMonth(), evStart.getDate());
  
  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;
    }
  }
  
  const rec = parseRecurrenceStr(event.recurrence);
  if (rec.type === 'NONE') return false;
  
  if (targetDayStart < eventStartDay) return false;
  
  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 : [(safeParseDate(event.start).getDay() || 7)];
    return by.includes(weekday) && (weeksSinceStart % rec.interval === 0);
  }
  
  return false;
}

async function getEvents(year, month) {
  const response = await axios.get(`${API_BASE_URL}/events`, { params: { year, month } });
  return response.data.data || [];
}

async function loadTodayTabEvents(targetDate) {
  console.log('加载【今日】Tab 数据...');
  const allEvents = await getEvents(targetDate.getFullYear(), targetDate.getMonth() + 1);
  const todayEvents = allEvents.filter(event => {
    if (event.deleted) return false;
    return shouldShowEventOnDate(event, targetDate);
  }).sort((a, b) => safeParseDate(a.start).getTime() - safeParseDate(b.start).getTime());
  
  return todayEvents;
}

async function loadCalendarTabEvents(targetDate) {
  console.log('加载【日历】Tab 数据...');
  const allEvents = [];
  const seenIds = new Set();
  
  for (let i = -6; i <= 1; i++) {
    let tempDate = new Date(targetDate);
    tempDate.setMonth(tempDate.getMonth() + i);
    const year = tempDate.getFullYear();
    const month = tempDate.getMonth() + 1;
    
    const monthEvents = await getEvents(year, month);
    for (const event of monthEvents) {
      if (!seenIds.has(event.id)) {
        seenIds.add(event.id);
        allEvents.push(event);
      }
    }
  }
  
  const validEvents = allEvents.filter(e => !e.deleted);
  const targetEvents = validEvents.filter(event => {
    return shouldShowEventOnDate(event, targetDate);
  }).sort((a, b) => safeParseDate(a.start).getTime() - safeParseDate(b.start).getTime());
  
  return targetEvents;
}

async function compare() {
  console.log('========================================');
  console.log('对比 2026-06-29 两个 Tab 的事件');
  console.log('========================================\n');
  
  const targetDate = new Date(2026, 5, 29);
  
  const [todayEvents, calendarEvents] = await Promise.all([
    loadTodayTabEvents(targetDate),
    loadCalendarTabEvents(targetDate)
  ]);
  
  console.log('\n===== 【今日】Tab 2026-06-29 事件 =====');
  console.log('总数:', todayEvents.length);
  todayEvents.forEach((event, index) => {
    console.log(`${index + 1}. ${event.title} (id: ${event.id})`);
  });
  
  console.log('\n===== 【日历】Tab 2026-06-29 事件 =====');
  console.log('总数:', calendarEvents.length);
  calendarEvents.forEach((event, index) => {
    console.log(`${index + 1}. ${event.title} (id: ${event.id})`);
  });
  
  console.log('\n===== 差异对比 =====');
  const todayIds = new Set(todayEvents.map(e => e.id));
  const calendarIds = new Set(calendarEvents.map(e => e.id));
  
  const onlyInToday = todayEvents.filter(e => !calendarIds.has(e.id));
  const onlyInCalendar = calendarEvents.filter(e => !todayIds.has(e.id));
  
  if (onlyInToday.length === 0 && onlyInCalendar.length === 0) {
    console.log('✅ 两个 Tab 的事件完全一致！');
  } else {
    if (onlyInToday.length > 0) {
      console.log(`❌ 只在【今日】Tab 中的事件 (${onlyInToday.length} 个):`);
      onlyInToday.forEach((event, index) => {
        console.log(`  ${index + 1}. ${event.title} (id: ${event.id})`);
      });
    }
    if (onlyInCalendar.length > 0) {
      console.log(`❌ 只在【日历】Tab 中的事件 (${onlyInCalendar.length} 个):`);
      onlyInCalendar.forEach((event, index) => {
        console.log(`  ${index + 1}. ${event.title} (id: ${event.id})`);
      });
    }
  }
  
  console.log('\n========================================');
}

compare().catch(console.error);