MathLearningSoftware/src/com/mathlearning/controller/QuestionController.java

package com.mathlearning.controller;

import com.mathlearning.model.Question;
import com.mathlearning.model.ConcreteQuestionGenerator;
import com.mathlearning.model.QuestionGenerator;
import java.util.List;

public class QuestionController {
  private QuestionGenerator questionGenerator;
  private List<Question> currentQuestions;
  private int currentQuestionIndex;
  private int score;

  public QuestionController() {
    this.questionGenerator = new ConcreteQuestionGenerator();
    this.currentQuestionIndex = 0;
    this.score = 0;
  }

  // 原有的生成问题方法
  public List<Question> generateQuestions(String level, int count) {
    return questionGenerator.generateQuestions(level, count);
  }

  // 原有的显示问题方法
  public void displayQuestions(String level, int count) {
    List<Question> questions = generateQuestions(level, count);
    System.out.println(level + "题目:");
    for (int i = 0; i < questions.size(); i++) {
      Question q = questions.get(i);
      System.out.println((i + 1) + ". " + q.getQuestionText());
      String[] options = q.getOptions();
      for (int j = 0; j < options.length; j++) {
        System.out.println("   " + (char) ('A' + j) + ". " + options[j]);
      }
      System.out.println("   正确答案: " + (char) ('A' + q.getCorrectIndex()));
      System.out.println();
    }
  }

  // 新增加的测验管理方法

  // 开始新测验
  public void startNewQuiz(String level, int questionCount) {
    this.currentQuestions = questionGenerator.generateQuestions(level, questionCount);
    this.currentQuestionIndex = 0;
    this.score = 0;
  }

  // 获取当前问题列表 - 新增的方法
  public List<Question> getCurrentQuestions() {
    return currentQuestions;
  }

  // 获取当前问题
  public Question getCurrentQuestion() {
    if (currentQuestions == null || currentQuestions.isEmpty()) {
      return null;
    }
    return currentQuestions.get(currentQuestionIndex);
  }

  // 获取当前问题索引
  public int getCurrentQuestionIndex() {
    return currentQuestionIndex;
  }

  // 获取问题总数
  public int getTotalQuestions() {
    return currentQuestions != null ? currentQuestions.size() : 0;
  }

  // 提交答案并检查是否正确
  public boolean submitAnswer(int selectedOption) {
    if (currentQuestions == null || currentQuestionIndex >= currentQuestions.size()) {
      return false;
    }

    Question currentQuestion = currentQuestions.get(currentQuestionIndex);
    boolean isCorrect = (selectedOption == currentQuestion.getCorrectIndex());

    if (isCorrect) {
      score++;
    }

    return isCorrect;
  }

  // 移动到下一个问题
  public boolean nextQuestion() {
    if (currentQuestions == null || currentQuestionIndex >= currentQuestions.size() - 1) {
      return false;
    }
    currentQuestionIndex++;
    return true;
  }

  // 移动到上一个问题
  public boolean previousQuestion() {
    if (currentQuestions == null || currentQuestionIndex <= 0) {
      return false;
    }
    currentQuestionIndex--;
    return true;
  }

  // 获取当前分数
  public int getScore() {
    return score;
  }

  // 检查是否还有更多问题
  public boolean hasMoreQuestions() {
    return currentQuestions != null && currentQuestionIndex < currentQuestions.size() - 1;
  }

  // 检查测验是否完成
  public boolean isQuizCompleted() {
    return currentQuestions != null && currentQuestionIndex >= currentQuestions.size() - 1;
  }

  // 获取所有问题（用于显示结果等）
  public List<Question> getAllQuestions() {
    return currentQuestions;
  }

  // 重置测验状态
  public void resetQuiz() {
    this.currentQuestions = null;
    this.currentQuestionIndex = 0;
    this.score = 0;
  }

  // 直接设置当前问题索引（如果需要）
  public void setCurrentQuestionIndex(int index) {
    if (currentQuestions != null && index >= 0 && index < currentQuestions.size()) {
      this.currentQuestionIndex = index;
    }
  }
}