MathLearningSoftware/src/com/mathlearning/view/QuizFrame.java

package com.mathlearning.view;

import com.mathlearning.controller.QuestionController;
import com.mathlearning.model.Question;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;

public class QuizFrame extends JFrame {
  private QuestionController questionController;
  private String level;
  private int totalQuestions;
  private LevelSelectionFrame parentFrame;
  private JLabel questionNumberLabel;
  private JLabel questionTextLabel;
  private JRadioButton[] optionButtons;
  private ButtonGroup buttonGroup;
  private JButton previousButton;
  private JButton nextButton;
  private JProgressBar progressBar;

  // 存储所有题目和用户选择
  private List<Question> allQuestions;
  private int[] userSelections;
  private int currentDisplayIndex; // 当前显示的题目索引

  public QuizFrame(String level, int questionCount, LevelSelectionFrame parent) {
    this.parentFrame = parent;
    this.level = level;
    this.totalQuestions = questionCount;
    this.questionController = new QuestionController();
    this.questionController.startNewQuiz(level, questionCount);

    // 获取所有题目
    this.allQuestions = questionController.getCurrentQuestions();
    this.userSelections = new int[questionCount];
    this.currentDisplayIndex = 0;

    // 初始化选择为-1（未选择）
    for (int i = 0; i < userSelections.length; i++) {
      userSelections[i] = -1;
    }

    initializeUI();
    showCurrentQuestion();
  }

  private void initializeUI() {
    setTitle("数学答题 - " + level);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(700, 550);
    setLocationRelativeTo(null);
    setResizable(false);

    JPanel mainPanel = new JPanel(new BorderLayout(10, 10));
    mainPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

    // 顶部面板（退出按钮和进度条）
    JPanel topPanel = new JPanel(new BorderLayout());

    JButton exitButton = new JButton("退出答题");
    exitButton.setFont(new Font("Microsoft YaHei", Font.PLAIN, 12));
    exitButton.setBackground(new Color(220, 100, 100));
    exitButton.setForeground(Color.WHITE);
    exitButton.addActionListener(e -> exitQuiz());

    progressBar = new JProgressBar(0, totalQuestions);
    progressBar.setValue(0);
    progressBar.setStringPainted(true);
    progressBar.setFont(new Font("Microsoft YaHei", Font.PLAIN, 12));

    topPanel.add(exitButton, BorderLayout.WEST);
    topPanel.add(progressBar, BorderLayout.CENTER);
    mainPanel.add(topPanel, BorderLayout.NORTH);

    // 问题面板
    JPanel questionPanel = new JPanel(new BorderLayout(10, 20));
    questionPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

    questionNumberLabel = new JLabel("", JLabel.CENTER);
    questionNumberLabel.setFont(new Font("Microsoft YaHei", Font.BOLD, 18));
    questionNumberLabel.setForeground(new Color(0, 100, 200));
    questionPanel.add(questionNumberLabel, BorderLayout.NORTH);

    questionTextLabel = new JLabel("", JLabel.CENTER);
    questionTextLabel.setFont(new Font("Microsoft YaHei", Font.PLAIN, 20));
    questionTextLabel.setBorder(BorderFactory.createEmptyBorder(20, 10, 20, 10));
    questionPanel.add(questionTextLabel, BorderLayout.CENTER);

    mainPanel.add(questionPanel, BorderLayout.CENTER);

    // 选项面板
    JPanel optionsPanel = new JPanel(new GridLayout(4, 1, 10, 10));
    optionsPanel.setBorder(
        BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.GRAY), "请选择答案"));

    optionButtons = new JRadioButton[4];
    buttonGroup = new ButtonGroup();

    for (int i = 0; i < 4; i++) {
      optionButtons[i] = new JRadioButton();
      optionButtons[i].setFont(new Font("Microsoft YaHei", Font.PLAIN, 16));
      optionButtons[i].setBackground(Color.WHITE);
      optionButtons[i].setFocusPainted(false);
      optionButtons[i].setPreferredSize(new Dimension(400, 40));

      final int index = i;
      optionButtons[i].addActionListener(
          e -> {
            // 保存当前选择
            userSelections[currentDisplayIndex] = index;
            System.out.println("用户选择: 第" + (currentDisplayIndex + 1) + "题 -> 选项" + index);
          });

      buttonGroup.add(optionButtons[i]);
      optionsPanel.add(optionButtons[i]);
    }

    JPanel optionsContainer = new JPanel(new FlowLayout(FlowLayout.CENTER));
    optionsContainer.add(optionsPanel);

    // 控制面板
    JPanel controlPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 20, 10));

    previousButton = new JButton("上一题");
    previousButton.setFont(new Font("Microsoft YaHei", Font.BOLD, 14));
    previousButton.setBackground(new Color(169, 169, 169));
    previousButton.setForeground(Color.WHITE);
    previousButton.setFocusPainted(false);
    previousButton.setBorder(BorderFactory.createEmptyBorder(8, 20, 8, 20));
    previousButton.setEnabled(false); // 第一题时禁用

    nextButton = new JButton("下一题");
    nextButton.setFont(new Font("Microsoft YaHei", Font.BOLD, 16));
    nextButton.setBackground(new Color(70, 130, 180));
    nextButton.setForeground(Color.WHITE);
    nextButton.setFocusPainted(false);
    nextButton.setBorder(BorderFactory.createEmptyBorder(10, 30, 10, 30));

    controlPanel.add(previousButton);
    controlPanel.add(nextButton);

    JPanel southPanel = new JPanel(new BorderLayout());
    southPanel.add(optionsContainer, BorderLayout.CENTER);
    southPanel.add(controlPanel, BorderLayout.SOUTH);
    mainPanel.add(southPanel, BorderLayout.SOUTH);

    // 添加事件监听器
    previousButton.addActionListener(new PreviousQuestionAction());
    nextButton.addActionListener(new NextQuestionAction());

    add(mainPanel);
  }

  private void showCurrentQuestion() {
    if (currentDisplayIndex >= allQuestions.size()) {
      finishQuiz();
      return;
    }
    Question currentQuestion = allQuestions.get(currentDisplayIndex);
    questionNumberLabel.setText(
        String.format("第 %d 题 / 共 %d 题", currentDisplayIndex + 1, totalQuestions));
    questionTextLabel.setText(
        "<html><div style='text-align: center;'>"
            + currentQuestion.getQuestionText()
            + "</div></html>");
    String[] options = currentQuestion.getOptions();
    for (int i = 0; i < 4; i++) {
      String optionText =
          String.format(
              "<html><div style='padding: 5px;'>%c. %s</div></html>", (char) ('A' + i), options[i]);
      optionButtons[i].setText(optionText);
    }
    buttonGroup.clearSelection(); // 清除当前选择状态
    // 恢复之前的选择（如果有）
    if (userSelections[currentDisplayIndex] != -1) {
      int previousSelection = userSelections[currentDisplayIndex];
      if (previousSelection >= 0 && previousSelection < 4) {
        optionButtons[previousSelection].setSelected(true);
      }
    }
    // 更新进度条
    progressBar.setValue(currentDisplayIndex);
    progressBar.setString(
        String.format(
            "%d/%d (%.0f%%)",
            currentDisplayIndex,
            totalQuestions,
            ((double) currentDisplayIndex / totalQuestions) * 100));
    updateButtonStates(); // 更新按钮状态
  }

  private void exitQuiz() {
    int result =
        JOptionPane.showConfirmDialog(this, "确定要退出答题吗？所有进度将丢失。", "退出确认", JOptionPane.YES_NO_OPTION);
    if (result == JOptionPane.YES_OPTION) {
      parentFrame.setVisible(true);
      this.dispose();
    }
  }

  private void updateButtonStates() {
    // 更新上一题按钮状态
    previousButton.setEnabled(currentDisplayIndex > 0);

    // 更新下一题按钮文本
    if (currentDisplayIndex == totalQuestions - 1) {
      nextButton.setText("完成答题");
    } else {
      nextButton.setText("下一题");
    }
  }

  private class PreviousQuestionAction implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
      if (currentDisplayIndex > 0) {
        currentDisplayIndex--;
        showCurrentQuestion();
      }
    }
  }

  private class NextQuestionAction implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
      // 检查是否选择了答案
      int selectedIndex = -1;
      for (int i = 0; i < 4; i++) {
        if (optionButtons[i].isSelected()) {
          selectedIndex = i;
          break;
        }
      }
      userSelections[currentDisplayIndex] = selectedIndex; // 保存当前选择
      // 如果没有选择答案，提示用户但允许继续（除了最后一题）
      if (selectedIndex == -1) {
        int result =
            JOptionPane.showConfirmDialog(
                QuizFrame.this, "您还没有选择答案，确定要继续下一题吗？", "确认", JOptionPane.YES_NO_OPTION);
        if (result != JOptionPane.YES_OPTION) {
          return;
        }
      }
      // 前进到下一题或完成
      if (currentDisplayIndex < totalQuestions - 1) {
        currentDisplayIndex++;
        showCurrentQuestion();
      } else {
        submitAllAnswers(); // 完成所有题目，提交答案并显示分数
        finishQuiz();
      }
    }
  }

  private void submitAllAnswers() {
    // 计算分数
    int score = 0;
    for (int i = 0; i < totalQuestions; i++) {
      if (userSelections[i] != -1) {
        // 使用 QuestionController 来检查答案
        questionController.setCurrentQuestionIndex(i);
        if (questionController.submitAnswer(userSelections[i])) {
          score++;
        }
      }
    }

    // 重置到第一个问题，以便在结果显示时能正确访问
    questionController.setCurrentQuestionIndex(0);
  }

  private void finishQuiz() {
    // 使用原有的构造函数
    ScoreFrame scoreFrame =
        new ScoreFrame(questionController, userSelections, allQuestions, parentFrame);
    scoreFrame.setVisible(true);
    this.dispose();
  }
} // 添加这个闭合大括号