math-problem-generator/src/Main.java

import account.Account;
import account.AccountService;
import account.SimpleAccountService;
import persistence.FileSaver;
import persistence.QuestionChecker;
import question.Question;
import question.QuestionGenerator;
import question.PrimaryQuestionGenerator;
import question.MiddleQuestionGenerator;
import question.HighQuestionGenerator;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
    private static final AccountService accountService = new SimpleAccountService();
    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("欢迎来到题目生成系统！");
            System.out.println("请输入用户名与密码（空格分隔）：");
            String[] parts = scanner.nextLine().split(" ");

            if (parts.length != 2) {
                System.out.println("输入格式错误！请重新输入！");
                continue;
            }

            Account account = accountService.login(parts[0], parts[1]);
            if (account == null) {
                System.out.println("登录失败！用户名或密码错误！");
                continue;
            }

            generator(account.getUserType(), account.getUserName());//登录成功 进入出题循环系统

        }
    }


    /**
     * 出题循环 出题类型选择器
     * @param type
     * @param userName
     */
    private static void generator(String type, String userName) {
        while (true) {
            System.out.println("当前类型为 " + type + " ，请选择是否切换类型（1-切换，0-保持）：");
            String switchInput = scanner.nextLine().trim();

            if (switchInput.equals("1")) {
                String newType = switchType(type);//出题类型切换器
                System.out.println("当前选择为 " + newType + " 出题");
                //切换新类型出题
                if (!questionLoop(newType, userName)) {
                    return;
                }
            } else if (switchInput.equals("0")) {
                System.out.println("当前选择为 " + type + " 出题");
                //使用原类型出题
                if (!questionLoop(type, userName)) {
                    return;
                }
            } else {
                System.out.println("输入错误，请输入0或1！");
            }
        }
    }

    /**
     * 出题类型切换
     * @param userType
     * @return 新类型
     */
    private static String switchType(String userType) {
        while (true){
            System.out.println("请输入新的类型（小学/初中/高中）：");
            String newType = scanner.nextLine().trim();
            if (!newType.equals("小学") && !newType.equals("初中") && !newType.equals("高中")) {
                System.out.println("输入错误！请重新输入！");
                continue;
            }
            return newType;
        }

    }

    /**
     * 生成题目
     * @param userType
     * @param username
     * @return 是否继续出题
     */
    private static boolean questionLoop(String userType, String username) {
        while (true) {
            System.out.println("请输入生成题目数量（数量限制：10-30，-1返回主页【重新登录】，-2继续出题，-3退出系统）：");
            String input = scanner.nextLine().trim();

            if (input.equals("-1")) {
                return false;
            } else if (input.equals("-2")) {
                return true;
            } else if (input.equals("-3")) {
                System.exit(0);
            }

            try {
                int count = Integer.parseInt(input);
                if (count < 10 || count > 30) {
                    System.out.println("题目数量必须在10-30之间！");
                    continue;
                }

                generateAndSaveQuestions(userType, username, count);
            } catch (NumberFormatException e) {
                System.out.println("请输入有效数字！");//防止用户生成非数字时程序崩溃
            }
        }
    }

    /**
     * 生成并保存题目
     * @param userType
     * @param username
     * @param count
     */
    private static void generateAndSaveQuestions(String userType, String username, int count) {
        QuestionGenerator generator = getGenerator(userType);//匹配生成器类型
        List<Question> questions = new ArrayList<>();
        for (int i = 0; i < count; i++) {
            Question q = generator.generateQuestion();//进行相应类型出题
            if (!QuestionChecker.isDuplicate(username, q.getQuestion())) {
                questions.add(q);//进行查重处理 未重复则加入到题目队列中
            } else {
                i--;
            }
        }

        try {
            FileSaver.saveQuestions(username, questions);//保存题目到文件夹
        } catch (Exception e) {
            System.out.println("题目保存失败！");
        }

    }

    /**
     * 根据用户类型匹配对应题目生成器
     * @param userType
     * @return 相应生成器
     */
    private static QuestionGenerator getGenerator(String userType) {
        switch (userType) {
            case "小学": return new PrimaryQuestionGenerator();
            case "初中": return new MiddleQuestionGenerator();
            case "高中": return new HighQuestionGenerator();
            default: return new PrimaryQuestionGenerator();
        }
    }
}