const { tryLoginRenewal } = require('../../utils/subscribe');
const announcementSession = require('../../utils/announcement-session');
const { itemsOf, totalOf } = require('../../utils/list-pagination');
let lastLocationReport = 0;
let locationReportUser = null;
const { withDataCache } = require('../../utils/page-cache');
const { getLayout } = require('../../utils/layout');
// pages/index/index.js
const { api, getImageUrl } = require('../../utils/request');
const { diaryEntry } = require('../../utils/journal');
const { saveScrollPosition, resetScrollOnTabShow } = require('../../utils/scroll-pos');

Page(withDataCache({
  onLoginSubscribeTap: function() { return tryLoginRenewal(); },
  onResize: function() { this.setData(getLayout()); },
  data: {
    showAnnouncement:false, announcement:null,
    userId: null,
    coupleId: null,
    
    partnerName: '和TA',
    loveStartDate: '',
    daysCount: '?',
    daysLabel: '已注册',
    datePrefix: '注册于',
    partner1AvatarUrl: '',
    partner2AvatarUrl: '',
    partner1Initial: '',
    partner2Initial: '',
    partner1Birthday: '',
    partner2Birthday: '',
    partner1Name: '?',
    partner2Name: '?',
    partner1Location: '',
    partner2Location: '',
    coupleDistance: '',

    stats: {
      timeline: 0, album: 0, diary: 0,
      songs: 0, checkin: 0, pet: 0
    },
    bgImage: '',
    scrollTop: 0,
    refreshing: false,
    relationshipKnown: false, homeError: false, statsLoading: true, statsError: false, recentDiary: [], recentAlbums: [], upcomingMemory: null
  },

  onLoad: function() {
    this.setData(getLayout());
    this.setData({
      userId: wx.getStorageSync('userId'),
      coupleId: wx.getStorageSync('coupleId'),
      scrollTop: 0
    });
    this.loadBg();
    this.loadData();
  },

  onShow: function() {
    this._announcementActive=true;
    this.loadAnnouncement();
    resetScrollOnTabShow(this, 'index');
    const tabBar = this.getTabBar && this.getTabBar();
    if (tabBar) tabBar.syncActive();
    var prevCoupleId = this.data.coupleId;
    var curCoupleId = wx.getStorageSync('coupleId');
    this.setData({
      userId: wx.getStorageSync('userId'),
      coupleId: curCoupleId
    });
    // 检查是否已被解绑（之前有 coupleId 但被清除了）
    if (prevCoupleId && !curCoupleId) {
      wx.reLaunch({ url: '/pages/index/index' });
      return;
    }
    this.loadBg();
    this.loadData();
    this.fetchIpLocation();
  },

  onHide: function() { this._announcementActive=false; },
  onUnload: function() { this._announcementActive=false; },
  loadAnnouncement: function() {
    if(this._announcementLoading)return this._announcementLoading;
    this._announcementLoading=(async()=>{
      try {
        const notice=await api.announcement();
        if(this._announcementActive===false)return;
        const userId=wx.getStorageSync('userId');
        const show=announcementSession.shouldShow(notice,userId);
        this.setData({announcement:notice, showAnnouncement:show});
        if(show)announcementSession.markShown(notice,userId);
      } catch(e) {} // 公告读取失败不阻塞首页。
    })().finally(()=>{this._announcementLoading=null;});
    return this._announcementLoading;
  },
  closeAnnouncement: function() {
    this.setData({showAnnouncement:false});
  },
  preventNoticeMove: function() {},
  // 保存滚动位置
  onScroll: function(e) {
    this._scrollTop = e.detail.scrollTop;
    saveScrollPosition('index', e.detail.scrollTop);
  },

  _loadingData: false,
  _daysSince: function(dateStr) {
    if (!dateStr) return '?';
    var parts = dateStr.substring(0, 10).split('-').map(Number);
    if (parts.length !== 3 || parts.some(isNaN) || parts[0] < 1970 ||
        parts[1] < 1 || parts[1] > 12 || parts[2] < 1 || parts[2] > 31) return '?';
    var start = new Date(parts[0], parts[1] - 1, parts[2]);
    if (start.getFullYear() !== parts[0] || start.getMonth() !== parts[1] - 1 ||
        start.getDate() !== parts[2]) return '?';
    var now = new Date();
    var today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
    return Math.max(0, Math.round((today - start) / 86400000));
  },
  loadData: async function() {
    var self = this;
    // 防止并发重复加载
    if (this._loadingData) return;
    this._loadingData = true;
    this.setData({ homeError: false });
    try {
      const info = await api.coupleInfo();
      this.setData({userId: wx.getStorageSync('userId')});
      this.setData({ relationshipKnown: true });
      // 未绑定情侣时显示用户注册时间和默认信息
      if (info.not_bound) {
        wx.removeStorageSync('coupleId');
        var p1 = info.partner1 || {};
        let daysCount = '?';
        let loveStartDate = '';
        if (info.love_start_date) {
          daysCount = this._daysSince(info.love_start_date);
          var parts = info.love_start_date.split('-');
          loveStartDate = parseInt(parts[0]) + '年' + parseInt(parts[1]) + '月' + parseInt(parts[2]) + '日';
        }
        this.setData({
          coupleId: null,
          partner1AvatarUrl: getImageUrl(p1.avatar),
          partner1Name: p1.nickname || '未命名',
          partner1Initial: (p1.nickname || '未命名')[0],
          partner1Birthday: '',
          partner1Location: p1.location || '',
          partner2AvatarUrl: '',
          partner2Name: '未绑定',
          partner2Initial: '?',
          partner2Birthday: '',
          partner2Location: '',
          daysCount: daysCount,
          daysLabel: '已注册',
          datePrefix: '注册于',
          loveStartDate: loveStartDate,
          coupleDistance: '',
          stats: { timeline: 0, album: 0, diary: 0, songs: 0, checkin: 0, pet: 0 }
        });
        await this.loadStats();
        return;
      }
      // 同步情侣ID：红包/邀请创建后分享人刷新即可识别
      if (info.id) {
        var prevCid = wx.getStorageSync('coupleId');
        if (prevCid != info.id) {
          wx.setStorageSync('coupleId', info.id);
        }
      }
      const myUid = this.data.userId;
      var p1 = info.partner1 || {};
      var p2 = info.partner2 || {};

      if (p2.id == myUid) {
        var tmp = p1; p1 = p2; p2 = tmp;
      }

      let daysCount = '?';
      let loveStartDate = '';
      var togetherStart = info.love_start_date || (info.created_at || '').substring(0, 10);
      if (togetherStart) {
        daysCount = this._daysSince(togetherStart);
        var parts = togetherStart.split('-');
        loveStartDate = parseInt(parts[0]) + '年' + parseInt(parts[1]) + '月' + parseInt(parts[2]) + '日';
      }

      function getBirthdayText(birthday) {
        if (!birthday) return '';
        var t = new Date(); t.setHours(0,0,0,0);
        var p = birthday.split('-');
        if (p.length !== 3) return '';
        var nb = new Date(t.getFullYear(), parseInt(p[1])-1, parseInt(p[2]));
        if (nb < t) nb.setFullYear(nb.getFullYear()+1);
        var c = Math.ceil((nb - t) / 86400000);
        if (c === 0) return '今天！';
        if (c === 1) return '1天';
        if (!Number.isFinite(c)) return '';
        return c + '天';
      }

      // 双方相距距离（后端基于双方经纬度用 Haversine 公式计算，单位：公里）
      var coupleDistance = '';
      if (info.distance !== null && info.distance !== undefined && info.distance !== '') {
        var d = parseFloat(info.distance);
        if (!isNaN(d)) {
          coupleDistance = d < 1
            ? '相距 ' + Math.round(d * 1000) + ' 米'
            : '相距 ' + d.toFixed(1) + ' 公里';
        }
      }

      var dn = {
        coupleId: info.id,
        daysCount: daysCount,
        daysLabel: '我们在一起',
        datePrefix: '始于',
        loveStartDate: loveStartDate,
        partner1AvatarUrl: getImageUrl(p1.avatar),
        partner2AvatarUrl: getImageUrl(p2.avatar),
        partner1Name: p1.nickname || p1.username || '?',
        partner2Name: p2.nickname || p2.username || '?',
        partner1Initial: (p1.nickname || p1.username || '?')[0],
        partner2Initial: (p2.nickname || p2.username || '?')[0],
        partner1Birthday: getBirthdayText(p1.birthday),
        partner2Birthday: getBirthdayText(p2.birthday),
        partner1Location: (p1.location && !/^-?\d+(\.\d+)?,-?\d+(\.\d+)?$/.test(p1.location)) ? p1.location : '',
        partner2Location: (p2.location && !/^-?\d+(\.\d+)?,-?\d+(\.\d+)?$/.test(p2.location)) ? p2.location : '',
        coupleDistance: coupleDistance
      };

      this.setData(dn);
      await this.loadStats();

    } catch (e) {
      this.setData({ homeError: true, relationshipKnown: !!this._hasCachedData, statsLoading: false, statsError: true });
      console.error(e);

    } finally {
      this._loadingData = false;
    }
  },

  loadStats: async function() {
    this.setData({ statsLoading: !this._hasCachedData, statsError: false });
    try {
      const [timeline, album, diary, songs, checkin, pet] = await Promise.all([
        api.timelineList(), api.albumList(), api.diaryList(),
        api.songsList(), api.checkinList(),
        this.data.coupleId ? api.petInfo() : Promise.resolve({ has_pet: false })
      ]);
      var photoCount = album && album.photo_total != null ? Number(album.photo_total) : itemsOf(album).reduce((sum,item)=>sum+(Number(item.photo_count)||0),0);
      var petLevel = 0;
      if (pet && pet.has_pet && pet.pet) {
        petLevel = parseInt(pet.pet.level || 0);
      }
      var recentDiary = ((diary && diary.items) || []).slice(0, 1).map(diaryEntry);
      var today = new Date(); today.setHours(0,0,0,0);
      var future = itemsOf(timeline).filter(function(item) { return item.event_date && new Date(item.event_date.replace(/-/g, '/')) >= today; }).sort(function(a,b) { return a.event_date.localeCompare(b.event_date); });
      var next = timeline && !Array.isArray(timeline) && 'upcoming' in timeline ? timeline.upcoming : future[0];
      this.setData({
        recentDiary: recentDiary,
        recentAlbums: itemsOf(album).filter(function(item) { return !!item.cover; }).slice(0,3).map(function(item) { return { id:item.id, title:item.title || '我们的相册', cover:getImageUrl(item.cover) }; }),
        upcomingMemory: next ? { title: next.title || '下一个记忆日', date: next.event_date, dateMonth: next.event_date.slice(5,7), dateDay: next.event_date.slice(8,10), days: Math.ceil((new Date(next.event_date.replace(/-/g, '/')) - today) / 86400000) } : null,
        stats: {
          timeline: totalOf(timeline),
          album: photoCount,
          diary: (diary && diary.total) ? diary.total : 0,
          songs: totalOf(songs),
          checkin: (checkin && checkin.checkin_log_total !== undefined) ? checkin.checkin_log_total : ((checkin && checkin.items) ? checkin.items.length : (Array.isArray(checkin) ? checkin.length : 0)),
          pet: petLevel
        }
      });
    } catch (e) { console.error(e); this.setData({ statsError: true }); } finally { this.setData({ statsLoading: false }); }
  },

  // 获取本机经纬度并上报后端解析地址（后端按距离判断是否重新解析，超过5km才更新），并刷新首页双方地址显示
  fetchIpLocation: function() {
    const locationUser = wx.getStorageSync('userId');
    if (locationReportUser === locationUser && Date.now() - lastLocationReport < 300000) return;
    locationReportUser = locationUser;
    lastLocationReport = Date.now();
    var self = this;
    var report = function(lat, lng) {
      var data = {};
      if (lat && lng) { data.lat = lat; data.lng = lng; }
      api.updateIpLocation(data).then(function(resp) {
        if (resp && resp.location) {
          self.loadData();
        }
      }).catch(function() { lastLocationReport = 0; });
    };
    // 优先用模糊定位获取经纬度（getFuzzyLocation 与 getLocation 互斥，统一用模糊定位）
    if (wx.getFuzzyLocation) {
      wx.getFuzzyLocation({
        type: 'gcj02',
        success: function(res) {
          report(res.latitude, res.longitude);
        },
        fail: function() {
          report(0, 0);
        }
      });
    } else {
      report(0, 0);
    }
  },

  // 背景图以接口返回为准
  loadBg: function() {
    var self = this;
    return api.getBgConfig().then(function(cfg) {
      self.setData({ bgImage: cfg && cfg.image ? getImageUrl(cfg.image) : '' });
    }).catch(function(e){ console.warn('loadBg error:', e && (e.error || e._statusCode || e)); });
  },

  // 跳转前保存当前滚动位置
  _savePosBeforeLeave: function() {
    saveScrollPosition('index', this._scrollTop == null ? this.data.scrollTop : this._scrollTop);
  },

  // 页面跳转
  goToDiary: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/diary/diary' }); },
  goToProfile: function() { this._savePosBeforeLeave(); wx.switchTab({ url: '/pages/profile/profile' }); },
  goToTimeline: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/timeline/timeline' }); },
  goToAlbum: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/albums/albums' }); },
  goToSongs: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/lovewords/lovewords' }); },
  goToCheckin: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/punch/punch' }); },
  goToPet: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/pet/pet' }); },
  goToPeriod: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/period/period' }); },
  bindPartner: function() { getApp().globalData.openProfileBind = true; wx.switchTab({ url: '/pages/profile/profile' }); },
  openJournalEntry: function(e) { wx.navigateTo({ url: '/pages/diary_detail/diary_detail?id=' + e.currentTarget.dataset.id }); },
  writeDiary: function() { wx.navigateTo({ url: '/pages/publish/publish?type=diary' }); },
  openAlbumPreview: function(e) { wx.navigateTo({ url: '/pages/album/album?album_id=' + e.currentTarget.dataset.id }); },
  openRecentDiary: function(e) { wx.navigateTo({ url: '/pages/diary_detail/diary_detail?id=' + e.currentTarget.dataset.id }); },
  showMore: function() {
    wx.switchTab({ url: '/pages/discover/discover' });
  },
  onPullDownRefresh: async function() {
    await this.loadData();
    this.loadBg();
    wx.stopPullDownRefresh();
  },
  onRefresh: async function() {
    this.setData({ refreshing: true });
    try {
      await this.loadData();
      this.loadBg();
    } catch (e) {
      console.error('下拉刷新失败', e);
    } finally {
      this.setData({ refreshing: false });
    }
  },

  // 分享到好友
  onShareAppMessage: function() {
    return {
      title: '让所有的爱有迹可循',
      path: '/pages/index/index',
      imageUrl: '/images/share.png'
    };
  },
  // 分享到朋友圈
  onShareTimeline: function() {
    return {
      title: '让所有的爱有迹可循',
      query: '',
      imageUrl: '/images/share.png'
    };
  }
}, {"loadData": ["coupleInfo", "timelineList", "albumList", "diaryList", "songsList", "checkinList", "petInfo", "getBgConfig"]}));