const db = wx.cloud.database();
const app = getApp();

Page({
  data: {
    students: [],
    selectedStudent: null,
    score: ''
  },

  onLoad: function() {
    this.getStudents();
  },

  // 获取学生列表
  getStudents: function() {
    db.collection('students').get().then(res => {
      console.log('Students retrieved:', res.data);
      if (res.data && res.data.length > 0) {
        this.setData({
          students: res.data
        });
        // 将学生列表存储到全局数据中
        app.globalData.students = res.data;
      } else {
        console.warn('No students found in the database.');
        wx.showToast({
          title: '没有学生信息',
          icon: 'none'
        });
      }
    }).catch(err => {
      console.error('Failed to get students:', err);
      wx.showToast({
        title: '获取学生信息失败',
        icon: 'none'
      });
    });
  },

  // 随机点名
  randomRollCall: function() {
    const students = this.data.students;
    if (students.length === 0) {
      wx.showToast({
        title: '没有学生信息',
        icon: 'none'
      });
      return;
    }

    const totalPoints = students.reduce((sum, student) => sum + Math.max(0, 10 - student.points), 0);
    let randomPoint = Math.random() * totalPoints;
    let cumulativePoint = 0;

    let selectedStudent = null;
    for (const student of students) {
      cumulativePoint += Math.max(0, 10 - student.points);
      if (randomPoint <= cumulativePoint) {
        selectedStudent = student;
        break;
      }
    }

    if (selectedStudent) {
      this.setData({
        selectedStudent: selectedStudent
      });
      wx.showToast({
        title: `点名成功: ${selectedStudent.name} (${selectedStudent.id})`,
        icon: 'success'
      });
    } else {
      wx.showToast({
        title: '点名失败',
        icon: 'none'
      });
    }
  },

  // 输入评分
  inputScore: function(e) {
    this.setData({
      score: e.detail.value
    });
  },

  // 更新积分
  updatePoints: function() {
    const student = this.data.selectedStudent;
    const score = parseFloat(this.data.score);

    if (isNaN(score)) {
      wx.showToast({
        title: '请输入有效的评分',
        icon: 'none'
      });
      return;
    }

    student.points += score;

    db.collection('students').doc(student._id).update({
      data: {
        points: student.points
      }
    }).then(() => {
      this.getStudents();
      wx.showToast({
        title: '评分成功',
        icon: 'success'
      });
    }).catch(err => {
      console.error('Failed to update student points:', err);
      wx.showToast({
        title: '评分失败',
        icon: 'none'
      });
    });
  }
});