classcall/App.js

import React, { useState } from 'react';
import './App.css'; // 确保你有样式文件

// 学生列表组件
const StudentList = ({ students }) => (
  <ul>
    {students.map((student, index) => (
      <li key={index}>
        {student.name} - 积分: {student.points}
      </li>
    ))}
  </ul>
);

// 随机选择组件
const RandomSelector = ({ students, onSelect }) => {
  const selectRandomStudent = () => {
    if (students.length === 0) return;

    // 根据积分降低被选中概率
    const totalPoints = students.reduce((acc, student) => acc + Math.max(student.points, 0), 0);
    const weightedStudents = students.flatMap(student => Array(Math.max(1, 10 - student.points)).fill(student));
    const randomIndex = Math.floor(Math.random() * weightedStudents.length);
    const selectedStudent = weightedStudents[randomIndex];

    if (typeof onSelect === 'function') {
      onSelect(selectedStudent);
    }
  };

  return (
    <div>
      <button onClick={selectRandomStudent}>随机选择学生</button>
    </div>
  );
};

// 主应用组件
const App = () => {
  const [students, setStudents] = useState([]);
  const [isCalling, setIsCalling] = useState(false);
  const [selectedStudent, setSelectedStudent] = useState(null);
  const [question, setQuestion] = useState('');
  const [answer, setAnswer] = useState('');

  const handleFileUpload = (event) => {
    const file = event.target.files[0];
    const reader = new FileReader();

    reader.onload = (e) => {
      const text = e.target.result;
      try {
        const importedStudents = JSON.parse(text);
        if (Array.isArray(importedStudents) && importedStudents.every(student => student.name)) {
          const studentsWithPoints = importedStudents.map(student => ({ ...student, points: 0 }));
          setStudents(studentsWithPoints);
        } else {
          alert("导入的文件格式不正确，请提供一个包含学生对象数组的 JSON 文件，每个对象应有 'name' 属性。");
        }
      } catch (error) {
        alert("文件解析出错，请确保它是有效的 JSON 文件。");
      }
    };

    reader.readAsText(file);
  };

  const handleStartCalling = () => {
    setIsCalling(true);
  };

  const handleStudentSelect = (student) => {
    setSelectedStudent(student);
    const updatedStudents = students.map(s =>
      s.name === student.name ? { ...s, points: s.points + 1 } : s
    );
    setStudents(updatedStudents);
  };

  const handleAnswerSubmission = () => {
    if (!selectedStudent) return;

    const correctRepeat = answer.trim() === question.trim();
    let pointChange = 0;

    if (correctRepeat) {
      pointChange += 0.5; // 准确重复问题
    } else {
      pointChange -= 1; // 未准确重复问题
    }

    // 假设根据情况准确回答问题，加分 (这里可以扩展逻辑)
    const correctAnswer = true; // 这里假设答案是正确的
    if (correctAnswer) {
      pointChange += 2; // 根据情况加分
    }

    const updatedStudents = students.map(s =>
      s.name === selectedStudent.name ? { ...s, points: s.points + pointChange } : s
    );

    setStudents(updatedStudents);
    setSelectedStudent(null);
    setQuestion('');
    setAnswer('');
  };

  return (
    <div className="App">
      <h1>课堂点名系统</h1>
      <input type="file" accept=".json" onChange={handleFileUpload} />
      <button onClick={handleStartCalling} disabled={students.length === 0 || isCalling}>
        开始点名
      </button>
      <StudentList students={students} />
      {isCalling && (
        <RandomSelector students={students} onSelect={handleStudentSelect} />
      )}
      {selectedStudent && (
        <div>
          <h2>选中的学生：{selectedStudent.name}</h2>
          <input
            type="text"
            placeholder="提问内容"
            value={question}
            onChange={(e) => setQuestion(e.target.value)}
          />
          <input
            type="text"
            placeholder="回答内容"
            value={answer}
            onChange={(e) => setAnswer(e.target.value)}
          />
          <button onClick={handleAnswerSubmission}>提交回答</button>
        </div>
      )}
    </div>
  );
};

export default App;