// pages/gpa/gpa.js
const { calculateGPA, showSuccess, showError } = require('../../utils/util.js')
const learningTracker = require('../../utils/learningTracker.js')

Page({
  data: {
    courses: [],
    courseName: '',
    courseScore: '',
    courseCredit: '',
    totalGPA: 0,
    totalCredits: 0
  },

  onLoad() {
    this.loadCourses()
  },

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

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

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

  // 加载已保存的课程
  loadCourses() {
    const courses = wx.getStorageSync('gpaCourses') || []
    this.setData({ courses })
    this.calculateTotal()
  },

  // 课程名称输入
  onNameInput(e) {
    this.setData({ courseName: e.detail.value })
  },

  // 成绩输入
  onScoreInput(e) {
    this.setData({ courseScore: e.detail.value })
  },

  // 学分输入
  onCreditInput(e) {
    this.setData({ courseCredit: e.detail.value })
  },

  // 添加课程
  onAddCourse() {
    const { courseName, courseScore, courseCredit, courses } = this.data
    
    if (!courseName.trim()) {
      showError('请输入课程名称')
      return
    }
    
    const score = parseFloat(courseScore)
    const credit = parseFloat(courseCredit)
    
    if (isNaN(score) || score < 0 || score > 100) {
      showError('请输入有效的成绩（0-100）')
      return
    }
    
    if (isNaN(credit) || credit <= 0) {
      showError('请输入有效的学分')
      return
    }
    
    const newCourse = {
      id: Date.now(),
      name: courseName.trim(),
      score: score,
      credit: credit
    }
    
    courses.push(newCourse)
    wx.setStorageSync('gpaCourses', courses)
    
    this.setData({
      courses,
      courseName: '',
      courseScore: '',
      courseCredit: ''
    })
    
    this.calculateTotal()
    showSuccess('添加成功')
  },

  // 删除课程
  onDeleteCourse(e) {
    const { id } = e.currentTarget.dataset
    
    wx.showModal({
      title: '确认删除',
      content: '确定要删除这门课程吗？',
      success: (res) => {
        if (res.confirm) {
          let { courses } = this.data
          courses = courses.filter(course => course.id !== id)
          wx.setStorageSync('gpaCourses', courses)
          
          this.setData({ courses })
          this.calculateTotal()
          showSuccess('删除成功')
        }
      }
    })
  },

  // 计算总GPA
  calculateTotal() {
    const { courses } = this.data
    const gpa = calculateGPA(courses)
    const totalCredits = courses.reduce((sum, course) => sum + course.credit, 0)
    
    this.setData({
      totalGPA: gpa,
      totalCredits: totalCredits
    })
  },

  // 清空所有
  onClearAll() {
    wx.showModal({
      title: '确认清空',
      content: '确定要清空所有课程吗？',
      success: (res) => {
        if (res.confirm) {
          wx.removeStorageSync('gpaCourses')
          this.setData({
            courses: [],
            totalGPA: 0,
            totalCredits: 0
          })
          showSuccess('已清空')
        }
      }
    })
  }
})