const { tryLoginRenewal } = require('../../utils/subscribe');
const { itemsOf, totalOf, mergeUnique } = require('../../utils/list-pagination');
const { withDataCache } = require('../../utils/page-cache');
const { getLayout } = require('../../utils/layout');
const { api, getImageUrl } = require('../../utils/request');
Page(withDataCache({
  onLoginSubscribeTap: function() { return tryLoginRenewal(); },
  noop: function() {},
  onResize: function() { this.setData(getLayout()); },
  data: { loadError: false,
    diary: null,
    loading: true,
    comments: [],
    commentPage: 1, commentsLoadingMore: false, commentsMoreError: false, commentsTotal: 0,
    hasMoreComments: true,
    showCommentInput: false,
    commentText: '',
    commentInitialText: '',
    commentLength: 0,
    commentFocus: false,
    commentKeyboardHeight: 0,
    commentEditorHeight: 56,
    commentSending: false,
    replyTo: null,
    coverSwiperIndex: 0,
    previewImages: [],
    previewIndex: 0,
    showPreview: false,
    myUid: 0
  },

  onLoad: function(options) {
    this.setData(getLayout());
    var diaryId = options.id;
    if (!diaryId) { wx.showToast({ title: '参数错误', icon: 'none' }); return; }
    this.setData({ diaryId: String(diaryId), myUid: wx.getStorageSync('userId') || 0 });
    this.loadDiary();
    this.loadComments();
  },

  onShow: function() {
    if (this.data.diaryId) { this.loadDiary(); this.loadComments(); }
  },

  loadDiary: async function() {
    if (this._pageLoading) return;
    this._pageLoading = true;
    this.setData({loading: !this._hasCachedData, loadError:false});
    try {
      var data = await api.diaryDetail(this.data.diaryId);
      data = this._formatDiary(data);
      this.setData({ diary: data, myUid: wx.getStorageSync('userId') || 0, loading: false });
    } catch (e) {
      this.setData({loadError:true});
      wx.showToast({ title: '加载失败', icon: 'none' });
      this.setData({ loading: false });
    }
    finally { this._pageLoading = false; this.setData({loading:false}); }
  },

  _formatDiary: function(data) {
    var myUid = wx.getStorageSync('userId') || 0;
    data.creator_name = data.creator_name || (data.created_by == myUid ? '我' : 'TA');
    data.creator_avatar = getImageUrl(data.creator_avatar);
    data.created_time = data.created_at ? data.created_at.substring(0, 16).replace('T', ' ') : '';
    var imgs = data.images || [];
    if (typeof imgs === 'string') {
      try { imgs = JSON.parse(imgs); } catch(e) { imgs = []; }
    }
    if (!Array.isArray(imgs)) imgs = [];
    data.imageUrls = imgs.map(function(p) { return getImageUrl(p); });
    data.comment_count = data.comment_count || 0;
    // 地理位置：优先显示地址名称，其次显示经纬度（经纬度为0的不显示）
    data.location_text = '';
    var hasCoord = data.lat && data.lng && parseFloat(data.lat) !== 0 && parseFloat(data.lng) !== 0;
    if (data.location) {
      data.location_text = data.location;
    } else if (hasCoord) {
      data.location_text = data.lat + ', ' + data.lng;
    }
    return data;
  },

  loadComments: function() { return this._loadCommentsPage(1); },
  _loadCommentsPage: async function(page) {
    page = Number(page) || 1;
    if (this._commentsFirst || (page > 1 && (this.data.commentsLoadingMore || !this.data.hasMoreComments))) return;
    if (page === 1) { this._commentsFirst = true; this._commentsGeneration = (this._commentsGeneration || 0) + 1; }
    var generation = this._commentsGeneration;
    this.setData(page === 1 ? {commentsError:false,commentsMoreError:false,commentsLoadingMore:false} : {commentsLoadingMore:true,commentsMoreError:false});
    try {
      var result = await api.diaryCommentList({diary_id:this.data.diaryId,page:page,page_size:20});
      if (generation !== this._commentsGeneration) return;
      var added = itemsOf(result).map(function(comment) {
        return Object.assign({}, comment, {avatar_url:getImageUrl(comment.avatar_url || comment.avatar || ''),_time:String(comment.created_at || comment.create_time || '').slice(0,16).replace('T',' ')});
      });
      this.setData({comments:page===1?added:mergeUnique(this.data.comments,added),commentPage:page,commentsTotal:totalOf(result),hasMoreComments:!Array.isArray(result)&&(result.has_more != null?!!result.has_more:page*20<totalOf(result))});
    } catch(e) {
      if (generation === this._commentsGeneration) this.setData(page===1?{commentsError:true}:{commentsMoreError:true});
    } finally {
      if (generation === this._commentsGeneration) { this._commentsFirst=false;this.setData({commentsLoadingMore:false}); }
    }
  },
  loadMoreComments: function() { return this._loadCommentsPage(this.data.commentPage+1); },


  onShareTap: function() {
    wx.showActionSheet({
      itemList: ['分享给微信好友', '分享到朋友圈', '生成分享海报'],
      success: function(res) {
        if (res.tapIndex === 0) {
          wx.shareAppMessage ? wx.shareAppMessage() : wx.showToast({ title: '请点击右上角分享', icon: 'none' });
        } else if (res.tapIndex === 1) {
          wx.showToast({ title: '请点击右上角分享到朋友圈', icon: 'none' });
        } else {
          wx.showToast({ title: '功能开发中', icon: 'none' });
        }
      }
    });
  },

  onCoverSwiperChange: function(e) {
    this.setData({ coverSwiperIndex: e.detail.current });
  },

  onImageTap: function(e) {
    var idx = this.data.coverSwiperIndex;
    var imgs = this.data.diary.imageUrls || [];
    this.setData({ showPreview: true, previewIndex: idx, previewImages: imgs });
  },
  closePreview: function() { this.setData({ showPreview: false }); },
  onPreviewSwiperChange: function(e) { this.setData({ previewIndex: e.detail.current }); },

  onCommentTap: function() {
    this.openComment(null);
  },
  onReplyTap: function(e) {
    var item = e.currentTarget.dataset.item;
    this.openComment({ id: item.id, user_id: item.user_id, nickname: item.nickname });
  },
  openComment: function(replyTo) {
    var sameTarget = (!replyTo && !this.data.replyTo) ||
      (replyTo && this.data.replyTo && replyTo.id === this.data.replyTo.id);
    var text = sameTarget ? this.data.commentText : '';
    this.setData({ showCommentInput: true, replyTo: replyTo, commentText: text,
      commentInitialText: text, commentLength: text.length, commentFocus: true,
      commentKeyboardHeight: 0, commentEditorHeight: 56 });
  },
  onCommentInput: function(e) {
    // 不把正文反复写回原生输入框，避免中文输入时光标跳动。
    this.data.commentText = e.detail.value || '';
    this.setData({ commentLength: this.data.commentText.length });
  },
  onCommentKeyboardHeight: function(e) {
    var height = Math.max(0, Number(e.detail.height) || 0);
    if (this.data.showCommentInput) this.setData({ commentKeyboardHeight: height });
  },
  onCommentLineChange: function(e) {
    this.setData({ commentEditorHeight: Math.min(160, Math.max(56, Number(e.detail.height) || 56)) });
  },
  onCommentBlur: function() {
    this.setData({ commentFocus: false });
  },
  cancelComment: function() {
    if (this.data.commentSending) return;
    this.setData({ showCommentInput: false, commentFocus: false, commentKeyboardHeight: 0 });
    wx.hideKeyboard();
  },
  onHide: function() {
    this.setData({ showCommentInput: false, commentFocus: false, commentKeyboardHeight: 0 });
  },

  submitComment: async function() {
    if (this.data.commentSending) return;
    var text = this.data.commentText.trim();
    if (!text) { wx.showToast({ title: '请输入评论内容', icon: 'none' }); return; }
    this.setData({ commentSending: true });
    try {
      var params = { diary_id: this.data.diaryId, content: text };
      if (this.data.replyTo) {
        params.parent_id = this.data.replyTo.id;
        params.reply_to_user_id = this.data.replyTo.user_id;
        params.reply_to_username = this.data.replyTo.nickname;
      }
      var res = await api.diaryCommentAdd(params);
      if (res.success) {
        this._commentsGeneration = (this._commentsGeneration || 0) + 1;
        this._commentsFirst = false;
        this.setData({commentsLoadingMore:false});
        var newComment = res.comment || {};
        newComment.avatar_url = getImageUrl(newComment.avatar_url || newComment.avatar || "");
        if (newComment.created_at) {
          newComment._time = newComment.created_at.substring(0, 16).replace('T', ' ');
        } else if (newComment.create_time) {
          newComment._time = newComment.create_time.substring(0, 16).replace('T', ' ');
        } else {
          var now = new Date();
          newComment._time = now.getFullYear() + '-' + String(now.getMonth()+1).padStart(2,'0') + '-' + String(now.getDate()).padStart(2,'0') + ' ' + String(now.getHours()).padStart(2,'0') + ':' + String(now.getMinutes()).padStart(2,'0');
        }
        var newComments = this.data.comments.slice();
        newComments.unshift(newComment);
        this.setData({
          comments: newComments,
          commentsTotal: this.data.commentsTotal + 1,
          showCommentInput: false,
          replyTo: null,
          commentText: '',
          commentInitialText: '',
          commentLength: 0,
          commentFocus: false,
          commentKeyboardHeight: 0,
          'diary.comment_count': (this.data.diary.comment_count || 0) + 1
        });
        wx.hideKeyboard();
        wx.showToast({ title: '评论成功', icon: 'success' });
      }
    } catch (e) {
      wx.showToast({ title: e.error || '评论失败', icon: 'none' });
    } finally {
      this.setData({ commentSending: false });
    }
  },

  onCommentLongPress: function(e) {
    var item = e.currentTarget.dataset.item;
    if (item.user_id != this.data.myUid) return;
    var self = this;
    wx.showModal({
      title: '删除评论',
      content: '确定要删除这条评论吗？',
      success: async function(res) {
        if (res.confirm) {
          try {
            await api.diaryCommentDelete({ id: item.id });
            var list = self.data.comments.filter(function(c) { return c.id != item.id; });
            self.setData({
              comments: list,
              'diary.comment_count': Math.max(0, (self.data.diary.comment_count || 0) - 1)
            });
            wx.showToast({ title: '已删除', icon: 'success' });
          } catch (e) { wx.showToast({ title: '删除失败', icon: 'none' }); }
        }
      }
    });
  },

  onMoreTap: function() {
    var self = this;
    wx.showActionSheet({
      itemList: ['编辑', '删除'],
      success: function(res) {
        if (res.tapIndex === 0) {
          wx.navigateTo({ url: '/pages/diary_edit/diary_edit?id=' + self.data.diaryId });
        } else if (res.tapIndex === 1) {
          self._deleteDiary();
        }
      }
    });
  },

  _deleteDiary: function() {
    var self = this;
    wx.showModal({
      title: '删除日记',
      content: '确定要删除这篇日记吗？',
      success: async function(res) {
        if (res.confirm) {
          try {
            await api.diaryDelete({ id: self.data.diaryId });
            wx.showToast({ title: '已删除', icon: 'success' });
            setTimeout(function() { wx.navigateBack(); }, 1500);
          } catch (e) {
            wx.showToast({ title: e.error || '删除失败', icon: 'none' });
          }
        }
      }
    });
  },

  goBack: function() { wx.navigateBack(); },
  goHome: function() { wx.switchTab({ url: '/pages/index/index' }); }
}, {"loadDiary": ["diaryDetail"], "loadComments": ["diaryCommentList"]}));