two_project/src/main/java/com/mathgenerator/controller/QuizController.java

package com.mathgenerator.controller;

import com.mathgenerator.model.ChoiceQuestion;
import com.mathgenerator.model.Level;
import com.mathgenerator.model.User;
import com.mathgenerator.service.PaperService;
import com.mathgenerator.service.strategy.MixedDifficultyStrategy;
import com.mathgenerator.storage.FileManager;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class QuizController {

    // --- 后端服务 ---
    private final PaperService paperService;

    // --- 答题状态 ---
    private User currentUser;
    private List<ChoiceQuestion> questions;
    private List<Integer> userAnswers = new ArrayList<>();
    private int currentQuestionIndex = 0;

    // --- FXML 控件 ---
    @FXML private Label questionNumberLabel;
    @FXML private ProgressBar progressBar;
    @FXML private Label questionTextLabel;
    @FXML private ToggleGroup optionsGroup;
    @FXML private RadioButton option1, option2, option3, option4;
    @FXML private Button submitButton;
    @FXML private Label statusLabel;

    /**
     * 构造函数，初始化后端服务
     */
    public QuizController() {
        // 这是依赖注入的一种简化形式，在真实项目中会使用框架管理
        FileManager fileManager = new FileManager();
        MixedDifficultyStrategy strategy = new MixedDifficultyStrategy();
        this.paperService = new PaperService(fileManager, strategy);
    }

    /**
     * 接收从主菜单传递过来的数据，并开始答题
     */
    public void initData(User user, Level level, int questionCount) {
        this.currentUser = user;
        // 调用后端服务生成题目
        this.questions = paperService.createPaper(user, questionCount, level);
        displayCurrentQuestion();
    }

    /**
     * 显示当前的题目和选项 (已更新，增加ABCD前缀)
     */
    private void displayCurrentQuestion() {
        ChoiceQuestion currentQuestion = questions.get(currentQuestionIndex);

        questionNumberLabel.setText(String.format("第 %d / %d 题", currentQuestionIndex + 1, questions.size()));
        progressBar.setProgress((double) (currentQuestionIndex + 1) / questions.size());
        questionTextLabel.setText(currentQuestion.questionText());

        List<RadioButton> radioButtons = List.of(option1, option2, option3, option4);
        String[] prefixes = {"A. ", "B. ", "C. ", "D. "}; // 定义选项前缀
        for (int i = 0; i < radioButtons.size(); i++) {
            // 将前缀和选项文本结合起来
            radioButtons.get(i).setText(prefixes[i] + currentQuestion.options().get(i));
        }

        optionsGroup.selectToggle(null); // 清除上一次的选择
        statusLabel.setText(""); // 清除状态提示

        if (currentQuestionIndex == questions.size() - 1) {
            submitButton.setText("完成答题");
        }
    }

    /**
     * 处理提交按钮的点击事件
     */
    @FXML
    private void handleSubmitButtonAction(ActionEvent event) {
        RadioButton selectedRadioButton = (RadioButton) optionsGroup.getSelectedToggle();
        if (selectedRadioButton == null) {
            statusLabel.setText("请选择一个答案！");
            return;
        }

        // 记录用户答案的索引
        List<RadioButton> radioButtons = List.of(option1, option2, option3, option4);
        userAnswers.add(radioButtons.indexOf(selectedRadioButton));

        // 移动到下一题或结束答题
        currentQuestionIndex++;
        if (currentQuestionIndex < questions.size()) {
            displayCurrentQuestion();
        } else {
            // 答题结束，计算分数并跳转到分数界面
            calculateScoreAndShowResults();
        }
    }

    /**
     * 计算分数并准备跳转到结果页面
     */
    private void calculateScoreAndShowResults() {
        int correctCount = 0;
        for (int i = 0; i < questions.size(); i++) {
            if (userAnswers.get(i) == questions.get(i).correctOptionIndex()) {
                correctCount++;
            }
        }
        double score = (double) correctCount / questions.size() * 100;

        // 禁用当前页面的按钮
        submitButton.setDisable(true);
        statusLabel.setText("答题已完成，正在为您计算分数...");

        // 加载分数界面并传递数据
        try {
            FXMLLoader loader = new FXMLLoader(getClass().getResource("/com/mathgenerator/view/ScoreView.fxml"));
            Parent root = loader.load();

            ScoreController controller = loader.getController();
            controller.initData(currentUser, score); // 将用户和分数传递过去

            Stage stage = (Stage) submitButton.getScene().getWindow();
            stage.setScene(new Scene(root));
            stage.setTitle("答题结果");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}