const { guardRecordEntries, withRecordAccess } = require('../../utils/record-access');
const { tryLoginRenewal } = require('../../utils/subscribe');
const { itemsOf, totalOf } = require('../../utils/list-pagination');
const { withDataCache } = require('../../utils/page-cache');
const { getLayout } = require('../../utils/layout');
// pages/discover/discover.js
const { api } = require('../../utils/request');
const { diaryEntry, albumEntry, memoryEntry } = require('../../utils/journal');
const { saveScrollPosition, resetScrollOnTabShow } = require('../../utils/scroll-pos');

Page(withRecordAccess(guardRecordEntries(withDataCache({
  onLoginSubscribeTap: function() { return tryLoginRenewal(); },
  onResize: function() { this.setData(getLayout()); },
  data: {
    stats: null, loading: true, loadError: false, refreshing: false, publishOpen: false,
    activeFilter: 'diary', filters: [{value:'diary',label:'日记',icon:'stat-book'}, {value:'album',label:'相册',icon:'stat-album'}, {value:'memory',label:'记忆日',icon:'stat-timeline'}],
    entries: [], albums: [], memories: [],
    scrollTop: 0
  },

  onLoad: function() {
    this.setData(getLayout());
    this.setData({ scrollTop: 0 });
  },
  onShow: function() {
    resetScrollOnTabShow(this, 'discover');
    const tabBar = this.getTabBar && this.getTabBar();
    if (tabBar) tabBar.syncActive();
    this._syncPublishTabBar();
    this.loadStats();
  },

  // 保存滚动位置
  onScroll: function(e) {
    this._scrollTop = e.detail.scrollTop;
    saveScrollPosition('discover', e.detail.scrollTop);
  },

  onPullDownRefresh: async function() {
    await this.loadStats(true);
    wx.stopPullDownRefresh();
  },

  loadStats: async function() {
    if (this._loading) return;
    this._loading = true;
    this.setData({loading: !this._hasCachedData, loadError:false});

    try {
      const [timeline, album, diary] = await Promise.all([
        api.timelineList(), api.albumList(), api.diaryList()
      ]);
      var photoCount = album && album.photo_total != null ? Number(album.photo_total) : itemsOf(album).reduce((sum,item)=>sum+(Number(item.photo_count)||0),0);
      var stats = {
        timeline: totalOf(timeline),
        album: photoCount,
        diary: (diary && diary.total) ? diary.total : 0,
      };
      this.setData({ stats: stats, entries: ((diary && diary.items) || []).map(diaryEntry), albums: itemsOf(album).map(albumEntry), memories: itemsOf(timeline).map(memoryEntry) });
    } catch (e) {
      console.error(e);
      this.setData({loadError:true});
    } finally { this._loading = false; this.setData({loading:false}); }
  },

  onRefresh: async function() { this.setData({refreshing:true}); try { await this.loadStats(); } finally { this.setData({refreshing:false}); } },
  selectFilter: function(e) { this.setData({activeFilter:e.currentTarget.dataset.filter}); },
  _syncPublishTabBar: function() {
    const tabBar = this.getTabBar && this.getTabBar();
    if (tabBar && tabBar.setHidden) tabBar.setHidden(this.data.publishOpen);
  },
  showPublish: function() { this.setData({publishOpen:true}); this._syncPublishTabBar(); },
  hidePublish: function() { this.setData({publishOpen:false}); this._syncPublishTabBar(); },
  onHide: function() { this.hidePublish(); },
  noop: function() {}, preventMove: function() {},
  _publish: function(type) { this.hidePublish(); this._savePosBeforeLeave(); wx.navigateTo({url:'/pages/publish/publish?type=' + type}); },
  writeDiary: function() { this._publish('diary'); },
  uploadPhotos: function() { this.hidePublish(); this._savePosBeforeLeave(); wx.navigateTo({url:'/pages/albums/albums?upload=1'}); },
  createAlbum: function() { this._publish('album'); },
  createMemory: function() { this._publish('timeline'); },
  openJournalEntry: function(e) { this._savePosBeforeLeave(); wx.navigateTo({url:'/pages/diary_detail/diary_detail?id=' + e.currentTarget.dataset.id}); },
  openAlbum: function(e) { this._savePosBeforeLeave(); wx.navigateTo({url:'/pages/album/album?album_id=' + e.currentTarget.dataset.id}); },
  // 跳转前保存当前滚动位置
  _savePosBeforeLeave: function() {
    saveScrollPosition('discover', this._scrollTop == null ? this.data.scrollTop : this._scrollTop);
  },

  // Tab 导航（替换，不留栈）
  goHome: function() { this._savePosBeforeLeave(); wx.switchTab({ url: '/pages/index/index' }); },
  goToDiaryFromDiscover: function() { this._savePosBeforeLeave(); wx.navigateTo({ url: '/pages/diary/diary?from=discover' }); },
  goToProfile: function() { this._savePosBeforeLeave(); wx.switchTab({ url: '/pages/profile/profile' }); },

  // 功能入口（推入栈，支持左滑返回）
  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.hidePublish();
    this._savePosBeforeLeave();
    wx.navigateTo({ url: '/pages/period/period' });
  }
}, {"loadStats": ["timelineList", "albumList", "diaryList"]}), ['showPublish', '_publish', 'uploadPhotos', 'openJournalEntry', 'openAlbum', 'goToDiaryFromDiscover', 'goToTimeline', 'goToAlbum', 'goToSongs', 'goToCheckin', 'goToPet', 'goToPeriod', 'selectFilter'])));