package mathlearning.ui;

import mathlearning.model.User;
import mathlearning.service.UserService;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class LoginFrame extends JFrame{
    private UserService userService;
    private JTextField emailField;
    private JPasswordField passwordField;

    public LoginFrame(UserService userService) {
        this.userService = userService;
        initializeUI();
    }

    private void initializeUI() {
        setTitle("数学学习软件 - 登录");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 300);
        setLocationRelativeTo(null);
        setResizable(false);

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

        // 标题
        JLabel titleLabel = new JLabel("用户登录", JLabel.CENTER);
        titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 24));
        mainPanel.add(titleLabel, BorderLayout.NORTH);

        // 表单面板
        JPanel formPanel = new JPanel(new GridLayout(3, 2, 10, 10));

        JLabel emailLabel = new JLabel("邮箱:");
        emailLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        emailField = new JTextField();

        JLabel passwordLabel = new JLabel("密码:");
        passwordLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        passwordField = new JPasswordField();

        formPanel.add(emailLabel);
        formPanel.add(emailField);
        formPanel.add(passwordLabel);
        formPanel.add(passwordField);

        mainPanel.add(formPanel, BorderLayout.CENTER);

        // 按钮面板
        JPanel buttonPanel = new JPanel(new FlowLayout());

        JButton loginButton = new JButton("登录");
        loginButton.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        loginButton.addActionListener(new LoginButtonListener());

        JButton registerButton = new JButton("注册");
        registerButton.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        registerButton.addActionListener(e -> openRegisterFrame());

        JButton changeCodeButton = new JButton("忘记密码？");
        changeCodeButton.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        changeCodeButton.addActionListener(e -> openChangeCodeFrame());

        buttonPanel.add(loginButton);
        buttonPanel.add(registerButton);
        buttonPanel.add(changeCodeButton);

        mainPanel.add(buttonPanel, BorderLayout.SOUTH);

        add(mainPanel);
    }

    private class LoginButtonListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            String email = emailField.getText().trim();
            String password = new String(passwordField.getPassword());

            if (email.isEmpty() || password.isEmpty()) {
                JOptionPane.showMessageDialog(LoginFrame.this,
                        "请输入邮箱和密码", "错误", JOptionPane.ERROR_MESSAGE);
                return;
            }

            if (userService.login(email, password)) {
                JOptionPane.showMessageDialog(LoginFrame.this,
                        "登录成功!", "成功", JOptionPane.INFORMATION_MESSAGE);
                // 这里可以打开主界面
                openMainFrame(email);
            } else {
                JOptionPane.showMessageDialog(LoginFrame.this,
                        "邮箱或密码错误", "登录失败", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    private void openRegisterFrame() {
        RegisterFrame registerFrame = new RegisterFrame(userService, this);
        registerFrame.setVisible(true);
        this.setVisible(false);
    }

    private void openChangeCodeFrame() {
        ChangeCodeFrame changeCodeFrame = new ChangeCodeFrame(userService, this);
        changeCodeFrame.setVisible(true);
        this.setVisible(false);
    }

    private void openMainFrame(String email) {
        User user = userService.getUser(email);
        // 如果用户类型为空，让用户选择类型
        if (user.getType() == null || user.getType().isEmpty()) {
            String[] types = {"小学", "初中", "高中"};
            String selectedType = (String) JOptionPane.showInputDialog(
                    this,
                    "欢迎 " + user.getUsername() + "!\n请选择您的教育阶段：",
                    "选择教育阶段",
                    JOptionPane.QUESTION_MESSAGE,
                    null,
                    types,
                    types[0] // 默认选择第一个
            );

            // 如果用户选择了类型（没有点击取消）
            if (selectedType != null) {
                // 更新用户类型
                boolean updated = userService.updateUserType(email, selectedType);
                if (updated) {
                    // 更新本地user对象
                    user.setType(selectedType);
                    JOptionPane.showMessageDialog(this,
                            "登录成功！\n教育阶段：" + selectedType,
                            "登录成功", JOptionPane.INFORMATION_MESSAGE);
                } else {
                    JOptionPane.showMessageDialog(this,
                            "登录成功！\n但教育阶段设置失败",
                            "登录成功", JOptionPane.WARNING_MESSAGE);
                }
            } else {
                // 如果用户取消选择，可以设置默认类型或者保持为空
                userService.updateUserType(email, "小学");
                user.setType("小学");
                JOptionPane.showMessageDialog(this,
                        "登录成功！\n已为您选择默认教育阶段：小学",
                        "登录成功", JOptionPane.INFORMATION_MESSAGE);
            }
        } else {
            // 如果已经有类型，直接显示欢迎信息
            JOptionPane.showMessageDialog(this,
                    "欢迎 " + user.getUsername() + "!\n登录成功。\n教育阶段：" + user.getType(),
                    "登录成功", JOptionPane.INFORMATION_MESSAGE);
        }

        openMainApplicationWindow(user, userService);
    }

    private void openMainApplicationWindow(User user, UserService userService) {
        MainFrame mainFrame = new MainFrame(user, userService);
        mainFrame.setVisible(true);
        dispose();
    }
}