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

Page({
  data: {
    students: [],
    selectedStudent: null,
    score: '',
    questionRepeatedCorrectly: false,
    additionalScore: 0,
    doublePoints: false,
    updatedScore: null
  },

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

  // 获取学生列表
  getStudents: function() {
    const MAX_LIMIT = 20;
    db.collection('students').count().then(res => {
      const total = res.total;
      const batchTimes = Math.ceil(total / MAX_LIMIT);
      const tasks = [];
      for (let i = 0; i < batchTimes; i++) {
        const promise = db.collection('students').skip(i * MAX_LIMIT).limit(MAX_LIMIT).get();
        tasks.push(promise);
      }
      Promise.all(tasks).then(results => {
        const students = results.reduce((acc, cur) => {
          return acc.concat(cur.data);
        }, []);
        this.setData({
          students: students
        });
        app.globalData.students = students;
        console.log('Students retrieved:', students);
      }).catch(err => {
        console.error('Failed to get students:', err);
        wx.showToast({
          title: '获取学生信息失败',
          icon: 'none'
        });
      });
    }).catch(err => {
      console.error('Failed to count students:', err);
      wx.showToast({
        title: '获取学生数量失败',
        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.showModal({
        title: '点名成功',
        content: `点到的同学是：${selectedStudent.name} (${selectedStudent.id})`,
        showCancel: false
      });

      // 触发双倍积分事件
      this.triggerDoublePointsEvent(selectedStudent);

      // 初始积分更新：到达课堂 +1 分
      this.updateInitialPoints(1); 
    } else {
      wx.showToast({
        title: '点名失败',
        icon: 'none'
      });
    }
  },

  // 触发双倍积分事件
  triggerDoublePointsEvent: function(student) {
    const probability = 0.1; // 10%的概率触发双倍积分
    if (Math.random() < probability) {
      this.setData({
        doublePoints: true
      });
      wx.showToast({
        title: '双倍积分！',
        icon: 'success'
      });
    } else {
      this.setData({
        doublePoints: false
      });
    }
  },

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

  // 初始积分更新函数
  updateInitialPoints: function(baseScore) {
    const student = this.data.selectedStudent;
    student.points += baseScore;
    this.saveStudentPoints(student);
  },

  // 更新积分
  updatePoints: function() {
    const student = this.data.selectedStudent;
    let score = 1; // 基础到达课堂积分+1
    console.log(`Initial score: ${score}`);
    
    // 判断是否能准确重复所提问的问题
    if (this.data.questionRepeatedCorrectly) {
      score += 0.5;
      console.log('Accurate repetition: +0.5');
      // 如果准确回答问题，输入要加的分数
      score += this.data.additionalScore;
      console.log(`Accurate answer score: +${this.data.additionalScore}`);//调试
    } else {
      score -= 1;
      console.log('Inaccurate repetition: -1');//调试
    }

    console.log(`Score before double points: ${score}`);//调试
    // 如果触发双倍积分事件，积分加倍
    if (this.data.doublePoints) {
      score *= 2;
      console.log('Double points applied');
    }

    console.log(`Final computed score: ${score}`);
    student.points += score;
    this.setData({ updatedScore: student.points });
    this.saveStudentPoints(student);
  },

  // 学生未到
  studentAbsent: function() {
    const student = this.data.selectedStudent;
    let score = -1; // 学生未到，扣1分

    student.points += score;
    this.setData({ updatedScore: student.points });
    this.saveStudentPoints(student);
  },

  // 保存学生积分
  saveStudentPoints: function(student) {
    db.collection('students').doc(student._id).update({
      data: {
        points: student.points
      }
    }).then(() => {
      this.getStudents();
      wx.showToast({
        title: '积分更新成功',
        icon: 'success'
      });
    }).catch(err => {
      console.error('Failed to update student points:', err);
      wx.showToast({
        title: '积分更新失败',
        icon: 'none'
      });
    });
  },

  // 设置回答问题的情况
  setQuestionRepeatedCorrectlyTrue: function() {
    this.setData({
      questionRepeatedCorrectly: true
    });
  },

  setQuestionRepeatedCorrectlyFalse: function() {
    this.setData({
      questionRepeatedCorrectly: false
    });
  }
});