package com.mathapp.panels;

import com.mathapp.MathApp;
import com.mathapp.models.User;
import com.mathapp.services.DataPersistence;

import javax.swing.*;
import java.awt.*;

public class LoginPanel extends JPanel {
  private final MathApp app;
  private final JTextField emailField;
  private final JPasswordField passwordField;

  public LoginPanel(MathApp app) {
    this.app = app;
    setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();

    JLabel titleLabel = new JLabel("欢迎回来", SwingConstants.CENTER);
    titleLabel.setFont(new Font("思源黑体", Font.BOLD, 32));

    emailField = new JTextField(20);
    passwordField = new JPasswordField(20);

    JButton loginButton = new JButton("登录");
    loginButton.setFont(new Font("思源黑体", Font.PLAIN, 16));
    loginButton.setPreferredSize(new Dimension(120, 40));

    JButton registerButton = new JButton("没有账户？立即注册");
    registerButton.setFont(new Font("思源黑体", Font.PLAIN, 12));
    registerButton.setBorderPainted(false);
    registerButton.setContentAreaFilled(false);
    registerButton.setFocusPainted(false);
    registerButton.setOpaque(false);
    registerButton.setCursor(new Cursor(Cursor.HAND_CURSOR));
    registerButton.setForeground(Color.BLUE);

    gbc.insets = new Insets(10, 10, 10, 10);
    gbc.gridwidth = 2;
    gbc.gridx = 0;
    gbc.gridy = 0;
    add(titleLabel, gbc);

    gbc.gridwidth = 1;
    gbc.gridy = 1;
    gbc.anchor = GridBagConstraints.EAST;
    add(new JLabel("邮箱:"), gbc);

    gbc.gridx = 1;
    gbc.anchor = GridBagConstraints.WEST;
    add(emailField, gbc);

    gbc.gridx = 0;
    gbc.gridy = 2;
    gbc.anchor = GridBagConstraints.EAST;
    add(new JLabel("密码:"), gbc);

    gbc.gridx = 1;
    gbc.anchor = GridBagConstraints.WEST;
    add(passwordField, gbc);

    gbc.gridy = 3;
    gbc.gridx = 0;
    gbc.gridwidth = 2;
    gbc.anchor = GridBagConstraints.CENTER;
    add(loginButton, gbc);

    gbc.gridy = 4;
    add(registerButton, gbc);

    loginButton.addActionListener(e -> handleLogin());
    registerButton.addActionListener(e -> app.showPanel(MathApp.REGISTER_PANEL));
  }

  public void resetPanel() {
    emailField.setText("");
    passwordField.setText("");
  }

  private void handleLogin() {
    String email = emailField.getText().trim();
    String password = new String(passwordField.getPassword());

    if (email.isEmpty() || password.isEmpty()) {
      JOptionPane.showMessageDialog(this, "邮箱和密码不能为空！", "错误", JOptionPane.ERROR_MESSAGE);
      return;
    }

    User user = DataPersistence.findUserByEmail(email);
    if (user != null && user.verifyPassword(password)) {
      app.setCurrentUserEmail(email);
      app.showPanel(MathApp.MAIN_MENU_PANEL);
    } else {
      JOptionPane.showMessageDialog(this, "邮箱或密码错误！", "登录失败", JOptionPane.ERROR_MESSAGE);
    }
  }
}