window.IP_CONFIG = {
  API_KEY: '你的高德key',           // 高德 Web 服务 API 密钥
  BLOG_LOCATION: {
    lng: 106.66,                    // 博主位置经度（重庆）
    lat: 29.97,                     // 博主位置纬度（重庆）
  },
  CACHE_DURATION: 1000 * 60 * 60,   // 缓存 1 小时
  HOME_PAGE_ONLY: false,            // false=所有页面都显示
};

const fetchIpData = async () => {
  // 并行：获取 IP（展示用） + 高德定位（用请求方 IP 定位，最可靠）
  const [ip, amapData] = await Promise.all([
    fetchClientIp(),
    (async () => {
      const response = await fetch(
        `https://restapi.amap.com/v3/ip?key=${encodeURIComponent(IP_CONFIG.API_KEY)}`
      );
      const data = await response.json();
      if (data.status !== '1') throw new Error(data.info || '高德 API 错误');
      return data;
    })(),
  ]);

  // 高德返回的是 rectangle（经纬度矩形），取中心点算坐标
  const rect = amapData.rectangle || '';
  let lng = 0, lat = 0;
  if (rect) {
    const pts = rect.split(';');
    const [lng1, lat1] = pts[0].split(',').map(Number);
    const [lng2, lat2] = pts[1].split(',').map(Number);
    lng = (lng1 + lng2) / 2;
    lat = (lat1 + lat2) / 2;
  }
  return { data: { lng, lat, prov: amapData.province, city: amapData.city }, ip };
};

const sources = [
  'https://4.ipw.cn',
  'https://api.ipify.org?format=json',
  'https://api.ip.sb/ip',
];

const calculateDistance = (lng, lat) => {
  if (!lng || !lat) return '??';
  const R = 6371; // 地球半径(km)
  const rad = Math.PI / 180;
  const dLat = (lat - IP_CONFIG.BLOG_LOCATION.lat) * rad;
  const dLon = (lng - IP_CONFIG.BLOG_LOCATION.lng) * rad;
  const a = Math.sin(dLat / 2) ** 2 +
            Math.cos(IP_CONFIG.BLOG_LOCATION.lat * rad) *
            Math.cos(lat * rad) *
            Math.sin(dLon / 2) ** 2;
  return Math.round(R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)));
};

function calcProgress() {
  var now = new Date();

  // 今日剩余小时
  var dayPassed = now.getHours() * 3600 + now.getMinutes() * 60 + now.getSeconds();
  var dayRemaining = 86400 - dayPassed;

  // 本周剩余天（周一为起点）
  var wd = now.getDay();
  var weekPassed = (wd === 0 ? 6 : wd - 1);
  var weekRemaining = 6 - weekPassed;

  // 本月剩余天
  var monthTotal = new Date(now.getFullYear(), now.getMonth() + 1, 0).getDate();
  var monthRemaining = monthTotal - now.getDate() + 1;

  // 本年剩余天
  var yearStart = new Date(now.getFullYear(), 0, 1);
  var yearEnd = new Date(now.getFullYear() + 1, 0, 1);
  var yearRemainingSec = (yearEnd - yearStart) / 1000 - (now - yearStart) / 1000;

  return {
    day:     { remaining: Math.floor(dayRemaining / 3600), percentage: (dayPassed / 86400) * 100, unit: "小时" },
    week:    { remaining: weekRemaining, percentage: ((weekPassed + 1) / 7) * 100, unit: "天" },
    month:   { remaining: monthRemaining, percentage: ((now.getDate() - 1) / monthTotal) * 100, unit: "天" },
    year:    { remaining: Math.floor(yearRemainingSec / 86400), percentage: ((now - yearStart) / (yearEnd - yearStart)) * 100, unit: "天" },
  };
}

var HOLIDAY_CN_BASE = "https://cdn.jsdelivr.net/gh/NateScarlet/holiday-cn@master/";

function fetchNextHoliday(cb) {
  var year = new Date().getFullYear();
  var urls = [HOLIDAY_CN_BASE + year + ".json"];
  // 12月预取下一年
  if (new Date().getMonth() >= 10) urls.push(HOLIDAY_CN_BASE + (year + 1) + ".json");

  var allDays = [];
  urls.forEach(function (url) {
    fetch(url).then(r => r.json()).then(data => {
      allDays = allDays.concat(data.days);
    }).then(() => {
      // 合并完所有年份后回调
      cb(resolveNextHoliday(allDays, new Date()));
    });
  });
}

function resolveNextHoliday(days, now) {
  // 按日期排序
  days.sort((a, b) => new Date(a.date) - new Date(b.date));

  // 把连续的 isOffDay=true 归为一段
  var groups = [], current = null;
  for (var i = 0; i < days.length; i++) {
    var d = days[i];
    if (!d.isOffDay) continue;
    var t = new Date(d.date + "T00:00:00").getTime();
    if (current && t - current.endTime === 86400000) {
      current.endTime = t;           // 连续，合并
    } else {
      current = { startTime: t, endTime: t, days: [d] };
      groups.push(current);
    }
  }

  // 找现在之后的第一个假期
  for (var j = 0; j < groups.length; j++) {
    if (groups[j].startTime >= now.getTime()) {
      var diffDays = Math.ceil((groups[j].startTime - new Date(now.getFullYear(), now.getMonth(), now.getDate())) / 86400000);
      return { name: groups[j].days[0].name, date: groups[j].days[0].date, diffDays: diffDays };
    }
  }
  return null;
}