const { withRecordAccess } = require('../../utils/record-access');
const { tryLoginRenewal } = require('../../utils/subscribe');
const { withDataCache } = require('../../utils/page-cache');
const { getLayout } = require('../../utils/layout');
// pages/timeline-detail/timeline-detail.js
const { api, getImageUrl } = require('../../utils/request');
const { createSwipeBack } = require('../../utils/util');

// 重复周期映射
var repeatUnitMap = { 'day': '天', 'week': '周', 'month': '月', 'year': '年' };
var weekdayNames = ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'];

// 计算距离今天最近的重复日期
function calcNearestRepeatDate(eventDate, today, interval, unit) {
  var base = new Date(eventDate);
  base.setHours(0,0,0,0);
  if (unit === 'day') {
    var diff = Math.floor((today - base) / 86400000);
    var cycles = Math.floor(diff / interval);
    var nearest = new Date(base.getTime() + cycles * interval * 86400000);
    nearest.setHours(0,0,0,0);
    if (nearest > today) {
      nearest = new Date(nearest.getTime() - interval * 86400000);
      nearest.setHours(0,0,0,0);
    }
    return nearest;
  } else if (unit === 'week') {
    var diff = Math.floor((today - base) / 86400000);
    var cycles = Math.floor(diff / (7 * interval));
    var nearest = new Date(base.getTime() + cycles * 7 * interval * 86400000);
    nearest.setHours(0,0,0,0);
    if (nearest > today) {
      nearest = new Date(nearest.getTime() - 7 * interval * 86400000);
      nearest.setHours(0,0,0,0);
    }
    return nearest;
  } else if (unit === 'month') {
    var nearest = new Date(base);
    nearest.setHours(0,0,0,0);
    while (true) {
      var next = new Date(nearest);
      next.setMonth(next.getMonth() + interval);
      next.setHours(0,0,0,0);
      if (next > today) break;
      nearest = next;
    }
    return nearest;
  } else if (unit === 'year') {
    var nearest = new Date(base);
    nearest.setHours(0,0,0,0);
    while (true) {
      var next = new Date(nearest);
      next.setFullYear(next.getFullYear() + interval);
      next.setHours(0,0,0,0);
      if (next > today) break;
      nearest = next;
    }
    return nearest;
  }
  return new Date(eventDate);
}

Page(withRecordAccess(withDataCache({
  onLoginSubscribeTap: function() { return tryLoginRenewal(); },
  onResize: function() { this.setData(getLayout()); },
  data: { loading: true, loadError: false,
    item: null,
    detailId: 0,
    bgImageUrl: '',
    daysNumber: '',
    daysSign: '',
    weekdayText: '',
    isAnniversary: true
  },

  onLoad: function(options) {
    this.setData(getLayout());
    var id = options.id;
    if (id) {
      this.setData({ detailId: String(id) });
      this.loadDetail(String(id));
    }
    var self = this;
    var swipe = createSwipeBack(function() { wx.navigateBack(); });
    this.onTouchStart = swipe.onTouchStart;
    this.onTouchEnd = swipe.onTouchEnd;
  },

  retryDetail: function() { this.loadDetail(this.data.detailId); },
  onShow: function() {
    this._syncNavigationColor();
    if (this.data.detailId) {
      this.loadDetail(this.data.detailId);
    }
  },

  onHide: function() {
    if (wx.setNavigationBarColor) wx.setNavigationBarColor({frontColor:'#000000',backgroundColor:'#FDE4EC'});
  },
  _syncNavigationColor: function() {
    if (wx.setNavigationBarColor) wx.setNavigationBarColor({frontColor:this.data.bgImageUrl?'#ffffff':'#000000',backgroundColor:this.data.bgImageUrl?'#000000':'#FDE4EC'});
  },
  goBack: function() {
    wx.navigateBack({fail:function(){wx.switchTab({url:'/pages/discover/discover'});}});
  },

  loadDetail: async function(id) {
    if (this._pageLoading) return;
    this._pageLoading = true;
    this.setData({loading: !this._hasCachedData, loadError:false});
    try {
      var item = await api.timelineDetail(id);
      var myUid = wx.getStorageSync('userId');
      var cid = String(item.created_by) || 0;

      // 获取情侣信息
      try {
        var info = await api.coupleInfo();
        var p1 = info.partner1 || {};
        var p2 = info.partner2 || {};
        var nameMap = {};
        var avatarMap = {};
        if (p1.id) { nameMap[p1.id] = p1.nickname || p1.username || 'TA'; avatarMap[p1.id] = getImageUrl(p1.avatar); }
        if (p2.id) { nameMap[p2.id] = p2.nickname || p2.username || 'TA'; avatarMap[p2.id] = getImageUrl(p2.avatar); }
        item.creator_name = nameMap[cid] || (cid == myUid ? '我' : 'TA');
        item.creator_avatar = avatarMap[cid] || '';
      } catch(e) {
        item.creator_name = cid == myUid ? '我' : 'TA';
        item.creator_avatar = '';
      }
      item.creator_initial = (item.creator_name || '?')[0].toUpperCase();

      // 计算天数
      var today = new Date(); today.setHours(0,0,0,0);
      var daysNumber = '';
      var daysSign = '';
      var isAnniversary = true;

      if (item.event_date) {
        var ed = new Date(item.event_date.replace(/-/g, '/'));
        ed.setHours(0,0,0,0);
        var repeatInterval = parseInt(item.repeat_interval) || 0;
        var repeatUnit = item.repeat_unit || '';

        var diff;
        if (repeatInterval > 0 && repeatUnit) {
          var baseDate = calcNearestRepeatDate(ed, today, repeatInterval, repeatUnit);
          diff = Math.floor((today - baseDate) / 86400000);
          isAnniversary = diff >= 0;
          daysSign = isAnniversary ? '+' : '-';
          daysNumber = Math.abs(diff);
          item.repeat_label = repeatUnitMap[repeatUnit] + '重复';
        } else {
          diff = Math.floor((today - ed) / 86400000);
          isAnniversary = diff >= 0;
          daysSign = isAnniversary ? '+' : '-';
          daysNumber = Math.abs(diff);
        }
      }

      // 星期
      var eventDateObj = new Date(item.event_date.replace(/-/g, '/'));
      var weekdayText = weekdayNames[eventDateObj.getDay()] || '';

      item.is_anniversary = isAnniversary;
      this.setData({
        item: item,
        daysNumber: daysNumber,
        daysSign: daysSign,
        weekdayText: weekdayText,
        isAnniversary: isAnniversary
      });

      // 从API数据加载背景图
      this.loadBgImage();

    } catch(e) {
      this.setData({loadError:true});
      console.error(e);
      wx.showToast({ title: (e && (e.error || e.errMsg || e.message)) || '加载失败', icon: 'none' });
    }
    finally { this._pageLoading = false; this.setData({loading:false}); }
  },

  // ===== 背景图片 =====
  loadBgImage: function() {
    var item = this.data.item;
    if (item && item.bg_image) {
      var fullUrl = getImageUrl(item.bg_image);
      this.setData({ bgImageUrl: fullUrl });
    } else {
      this.setData({ bgImageUrl: '' });
    }
    this._syncNavigationColor();
  },

  // ===== 编辑 =====
  goEdit: function() {
    var item = this.data.item;
    if (item && item.id) {
      wx.navigateTo({
        url: '/pages/publish/publish?type=timeline&edit=' + item.id
      });
    }
  },

  // ===== 导航 =====
  goBack: function() { wx.navigateBack(); },
  goHome: function() { wx.switchTab({ url: '/pages/index/index' }); },
  goProfile: function() { wx.switchTab({ url: '/pages/profile/profile' }); }
}, {"loadDetail": ["timelineDetail", "coupleInfo"]})));