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

Page({
  data: {
    course: null,
    isFavorite: false,
    activeTab: 0,
    tabs: ['课程信息', '教学大纲', '课程评价']
  },

  onLoad(options) {
    const { id } = options
    this.loadCourseDetail(id)
  },

  onShow() {
    // 开始跟踪学习时间
    learningTracker.onPageShow('course')
  },

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

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

  // 加载课程详情
  loadCourseDetail(id) {
    const course = coursesData.find(c => c.id === parseInt(id))
    if (course) {
      const favorites = wx.getStorageSync('favoriteCourses') || []
      this.setData({
        course,
        isFavorite: favorites.includes(course.id)
      })
    } else {
      showError('课程不存在')
      setTimeout(() => {
        wx.navigateBack()
      }, 1500)
    }
  },

  // 切换标签
  onTabChange(e) {
    const { index } = e.currentTarget.dataset
    this.setData({ activeTab: index })
  },

  // 收藏/取消收藏
  onToggleFavorite() {
    const { course, isFavorite } = this.data
    let favorites = wx.getStorageSync('favoriteCourses') || []
    
    if (isFavorite) {
      favorites = favorites.filter(id => id !== course.id)
      showSuccess('取消收藏')
    } else {
      favorites.push(course.id)
      showSuccess('收藏成功')
    }
    
    wx.setStorageSync('favoriteCourses', favorites)
    this.setData({ isFavorite: !isFavorite })
  },

  // 分享课程
  onShareAppMessage() {
    const { course } = this.data
    return {
      title: `推荐课程：${course.name}`,
      path: `/pages/course-detail/course-detail?id=${course.id}`
    }
  }
})