MathSystem2/src/main/java/com/example/mathsystemtogether/ChangePasswordController.java

package com.example.mathsystemtogether;

import javafx.fxml.FXML;
import javafx.scene.control.*;
import javafx.stage.Stage;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.regex.Pattern;

public class ChangePasswordController {

    @FXML
    private TextField usernameField;

    @FXML
    private PasswordField oldPasswordField;

    @FXML
    private PasswordField newPasswordField;

    @FXML
    private PasswordField confirmNewPasswordField;

    @FXML
    private Button changePasswordButton;

    @FXML
    private Button cancelButton;

    @FXML
    private Label statusLabel;

    private String currentUser;
    private ExamController examController;
    private static final String USER_DATA_FILE = "user_data.txt";
    
    // 密码强度验证正则表达式
    private static final String PASSWORD_REGEX = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d).+$";
    private static final Pattern PASSWORD_PATTERN = Pattern.compile(PASSWORD_REGEX);

    public void setCurrentUser(String username) {
        this.currentUser = username;
        usernameField.setText(username);
    }

    public void setExamController(ExamController examController) {
        this.examController = examController;
    }

    @FXML
    private void handleChangePassword() {
        String oldPassword = oldPasswordField.getText();
        String newPassword = newPasswordField.getText();
        String confirmNewPassword = confirmNewPasswordField.getText();

        if (oldPassword.isEmpty() || newPassword.isEmpty() || confirmNewPassword.isEmpty()) {
            showStatus("请填写所有字段", true);
            return;
        }

        if (!examController.checkUserPassword(currentUser, oldPassword)) {
            showStatus("原密码错误", true);
            return;
        }

        if (newPassword.length() < 6) {
            showStatus("新密码至少需要6个字符", true);
            return;
        }
        
        if (!isValidPassword(newPassword)) {
            showStatus("新密码必须包含大小写字母和数字", true);
            return;
        }

        if (!newPassword.equals(confirmNewPassword)) {
            showStatus("两次输入的新密码不一致", true);
            return;
        }

        if (oldPassword.equals(newPassword)) {
            showStatus("新密码不能与原密码相同", true);
            return;
        }

        if (updatePassword(currentUser, newPassword)) {
            showStatus("密码修改成功！", false);

            // 延迟关闭窗口
            new java.util.Timer().schedule(
                new java.util.TimerTask() {
                    @Override
                    public void run() {
                        javafx.application.Platform.runLater(() -> {
                            handleClose();
                        });
                    }
                },
                1500
            );
        } else {
            showStatus("密码修改失败，请重试", true);
        }
    }

    @FXML
    private void handleCancel() {
        handleClose();
    }

    private void handleClose() {
        Stage stage = (Stage) cancelButton.getScene().getWindow();
        stage.close();
    }

    private boolean updatePassword(String username, String newPassword) {
        try {
            // 读取所有用户数据
            List<String> lines = Files.readAllLines(Paths.get(USER_DATA_FILE));
            boolean userFound = false;

            for (int i = 0; i < lines.size(); i++) {
                String[] parts = lines.get(i).split("\\|");
                if (parts.length >= 2 && parts[0].equals(username)) {
                    // 更新密码
                    parts[1] = newPassword;
                    lines.set(i, String.join("|", parts));
                    userFound = true;
                    break;
                }
            }

            if (userFound) {
                // 写回文件
                Files.write(Paths.get(USER_DATA_FILE), lines);
                // 更新内存中的用户数据
                examController.updateUserPassword(username, newPassword);
                return true;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 验证密码强度
     * 密码必须包含至少一个小写字母、一个大写字母和一个数字
     */
    private boolean isValidPassword(String password) {
        return PASSWORD_PATTERN.matcher(password).matches();
    }

    private void showStatus(String message, boolean isError) {
        statusLabel.setText(message);
        if (isError) {
            statusLabel.setStyle("-fx-text-fill: #DC143C; -fx-font-weight: bold; -fx-font-size: 14;");
        } else {
            statusLabel.setStyle("-fx-text-fill: #228B22; -fx-font-weight: bold; -fx-font-size: 14;");
        }
    }
}