// pages/forum/forum.js
const {forumData} = require('../../utils/data.js')
const learningTracker = require('../../utils/learningTracker.js')

Page({
  data: {
    posts: [],
    categories: ['全部', '数学', '物理', '计算机', '英语', '其他'],
    selectedCategory: '全部'
  },

  onLoad() {
    this.loadPosts()
  },

  onShow() {
    // 开始跟踪学习时间
    learningTracker.onPageShow('forum')
    
    // 每次显示时重新加载，以获取最新发布的帖子
    this.loadPosts()
    
    // 更新自定义TabBar选中状态
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
      this.getTabBar().setData({
        selected: 2
      })
    }
  },

  onHide() {
    // 停止跟踪学习时间
    learningTracker.onPageHide()
  },

  onUnload() {
    // 记录学习时长
    learningTracker.onPageUnload()
  },

  // 加载帖子
  loadPosts() {
    try {
      let posts = wx.getStorageSync('forumPosts') || forumData
      
      // 同步评论数量
      const allComments = wx.getStorageSync('forumComments') || {}
      // 获取收藏的帖子列表
      const favoritePosts = wx.getStorageSync('favoritePosts') || []
      
      posts = posts.map(post => {
        const comments = allComments[post.id] || []
        post.comments = comments.length
        // 检查是否已收藏
        post.isFavorite = favoritePosts.some(fav => fav.id === post.id)
        return post
      })
      
      // 保存更新后的帖子数据
      wx.setStorageSync('forumPosts', posts)
      
      // 按时间排序(最新的在前)
      posts.sort((a, b) => b.id - a.id)
      
      this.setData({ posts })
      this.filterPosts()
    } catch (error) {
      console.error('加载帖子失败:', error)
      wx.showToast({
        title: '数据加载失败',
        icon: 'none'
      })
    }
  },

  // 分类筛选
  onCategoryChange(e) {
    const category = e.currentTarget.dataset.category
    this.setData({ selectedCategory: category })
    this.filterPosts()
  },

  // 筛选帖子
  filterPosts() {
    const { selectedCategory } = this.data
    let allPosts = wx.getStorageSync('forumPosts') || forumData
    
    // 同步评论数量和收藏状态
    const allComments = wx.getStorageSync('forumComments') || {}
    const favoritePosts = wx.getStorageSync('favoritePosts') || []
    
    allPosts = allPosts.map(post => {
      const comments = allComments[post.id] || []
      post.comments = comments.length
      // 检查是否已收藏
      post.isFavorite = favoritePosts.some(fav => fav.id === post.id)
      return post
    })
    
    if (selectedCategory === '全部') {
      this.setData({ posts: allPosts })
    } else {
      const filtered = allPosts.filter(post => post.category === selectedCategory)
      this.setData({ posts: filtered })
    }
  },

  // 查看帖子详情
  onPostDetail(e) {
    const { id } = e.currentTarget.dataset
    wx.navigateTo({
      url: `/pages/forum-detail/forum-detail?id=${id}`
    })
  },

  // 发布新帖子
  onNewPost() {
    wx.navigateTo({
      url: '/pages/post/post'
    })
  },

  // 点赞
  onLike(e) {
    const { id } = e.currentTarget.dataset
    let posts = wx.getStorageSync('forumPosts') || forumData
    
    posts = posts.map(post => {
      if (post.id === id) {
        post.isLiked = !post.isLiked
        post.likes = post.isLiked ? post.likes + 1 : post.likes - 1
      }
      return post
    })
    
    wx.setStorageSync('forumPosts', posts)
    this.loadPosts()
  },

  // 预览图片
  onPreviewImage(e) {
    const { url, urls } = e.currentTarget.dataset
    wx.previewImage({
      current: url,      // 当前显示图片的链接
      urls: urls         // 需要预览的图片链接列表
    })
  },

  // 收藏/取消收藏
  onFavorite(e) {
    const { id } = e.currentTarget.dataset
    let favoritePosts = wx.getStorageSync('favoritePosts') || []
    let posts = wx.getStorageSync('forumPosts') || forumData
    
    // 找到当前帖子
    const currentPost = posts.find(post => post.id === id)
    if (!currentPost) return
    
    // 检查是否已收藏
    const index = favoritePosts.findIndex(fav => fav.id === id)
    
    if (index > -1) {
      // 已收藏，取消收藏
      favoritePosts.splice(index, 1)
      wx.showToast({
        title: '取消收藏',
        icon: 'success',
        duration: 1500
      })
    } else {
      // 未收藏，添加收藏
      favoritePosts.push({
        id: currentPost.id,
        title: currentPost.title,
        category: currentPost.category,
        time: new Date().toLocaleString()
      })
      wx.showToast({
        title: '收藏成功',
        icon: 'success',
        duration: 1500
      })
    }
    
    // 保存收藏列表
    wx.setStorageSync('favoritePosts', favoritePosts)
    
    // 重新加载帖子列表
    this.loadPosts()
  }
})