// pages/courses/courses.js
const { coursesData } = require('../../utils/data.js')
const { showSuccess, showError } = require('../../utils/util.js')
const learningTracker = require('../../utils/learningTracker.js')

Page({
  data: {
    allCourses: [],
    displayCourses: [],
    searchKeyword: '',
    selectedCategory: 'all',
    categories: [
      { id: 'all', name: '全部' },
      { id: '必修', name: '必修' },
      { id: '专业必修', name: '专业必修' },
      { id: '选修', name: '选修' },
      { id: '专业选修', name: '专业选修' }
    ],
    showFilter: false,
    selectedDepartment: '全部',  // 修改为'全部'而不是'all'
    departments: [
      '全部',
      '数学系',
      '物理系',
      '计算机学院',
      '外国语学院'
    ]
  },

  onLoad() {
    try {
      this.loadCourses()
    } catch (error) {
      console.error('课程加载失败:', error)
      showError('课程数据加载失败')
    }
  },

  onShow() {
    // 开始跟踪学习时间
    learningTracker.onPageShow('course')
    
    // 更新自定义TabBar选中状态
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
      this.getTabBar().setData({
        selected: 1
      })
    }
  },

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

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

  // 加载课程数据
  loadCourses() {
    const courses = coursesData.map(course => ({
      ...course,
      isFavorite: this.checkFavorite(course.id)
    }))
    
    this.setData({
      allCourses: courses,
      displayCourses: courses
    })
  },

  // 检查是否已收藏
  checkFavorite(courseId) {
    const favorites = wx.getStorageSync('favoriteCourses') || []
    return favorites.includes(courseId)
  },

  // 搜索课程(防抖处理)
  onSearchInput(e) {
    const keyword = e.detail.value
    this.setData({ searchKeyword: keyword })
    
    // 清除之前的延迟搜索
    if (this.searchTimer) {
      clearTimeout(this.searchTimer)
    }
    
    // 设置300ms防抖
    this.searchTimer = setTimeout(() => {
      this.filterCourses()
    }, 300)
  },

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

  // 院系筛选
  onDepartmentChange(e) {
    const index = e.detail.value
    this.setData({ 
      selectedDepartment: this.data.departments[index],
      showFilter: false
    })
    this.filterCourses()
  },

  // 筛选课程
  filterCourses() {
    const { allCourses, searchKeyword, selectedCategory, selectedDepartment } = this.data
    
    console.log('筛选条件:', {
      searchKeyword,
      selectedCategory,
      selectedDepartment,
      allCoursesCount: allCourses.length
    })
    
    let filtered = allCourses.filter(course => {
      // 搜索关键词过滤（不区分大小写，去除空格）
      const keyword = (searchKeyword || '').trim().toLowerCase()
      const matchKeyword = !keyword || 
        (course.name && course.name.toLowerCase().includes(keyword)) ||
        (course.teacher && course.teacher.toLowerCase().includes(keyword)) ||
        (course.code && course.code.toLowerCase().includes(keyword))
      
      // 分类过滤
      const matchCategory = selectedCategory === 'all' || 
        course.category === selectedCategory
      
      // 院系过滤
      const matchDepartment = selectedDepartment === '全部' ||
        course.department === selectedDepartment
      
      return matchKeyword && matchCategory && matchDepartment
    })
    
    console.log('筛选结果:', filtered.length, '门课程')
    this.setData({ displayCourses: filtered })
  },

  // 显示/隐藏筛选面板
  toggleFilter() {
    this.setData({ showFilter: !this.data.showFilter })
  },

  // 收藏课程
  onFavorite(e) {
    const { id } = e.currentTarget.dataset
    const { allCourses } = this.data
    
    // 更新课程收藏状态
    const updatedCourses = allCourses.map(course => {
      if (course.id === id) {
        course.isFavorite = !course.isFavorite
        
        // 保存到本地存储
        let favorites = wx.getStorageSync('favoriteCourses') || []
        if (course.isFavorite) {
          favorites.push(id)
          showSuccess('收藏成功')
        } else {
          favorites = favorites.filter(fid => fid !== id)
          showSuccess('取消收藏')
        }
        wx.setStorageSync('favoriteCourses', favorites)
      }
      return course
    })
    
    this.setData({ allCourses: updatedCourses })
    this.filterCourses()
  },

  // 查看课程详情
  onCourseDetail(e) {
    const { id } = e.currentTarget.dataset
    wx.navigateTo({
      url: `/pages/course-detail/course-detail?id=${id}`
    })
  },

  // 清空筛选
  onResetFilter() {
    this.setData({
      searchKeyword: '',
      selectedCategory: 'all',
      selectedDepartment: '全部',
      showFilter: false
    })
    this.filterCourses()
  },

  // 清空搜索
  onClearSearch() {
    this.setData({ searchKeyword: '' })
    this.filterCourses()
  }
})