package view;

import java.awt.*;
import java.util.Properties;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.BorderFactory;

import jakarta.mail.Authenticator;
import jakarta.mail.Message;
import jakarta.mail.PasswordAuthentication;
import jakarta.mail.Session;
import jakarta.mail.Transport;
import jakarta.mail.internet.InternetAddress;
import jakarta.mail.internet.MimeMessage;

import model.Login;
import model.LanguageSwitch;
/**
 * 注册界面（使用 QQ 邮箱发送验证码）
 */
public class RegisterFrame extends JDialog {

  private JTextField usernameField;
  private JTextField emailField;
  private JPasswordField pwdField;
  private JPasswordField pwdField2;
  private JTextField codeField;
  private String lastCode;

  private boolean isValidEmail(String email){
    String emailRegex = "^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,7}$";
    return email.matches(emailRegex);
  }
  // QQ 邮箱配置
  private static final String FROM_EMAIL = "songqifeng.sqf@qq.com";
  private static final String AUTH_CODE = "gcyschltjgxedgjd"; // ⚠️ 在 QQ 邮箱里申请的授权码
  public RegisterFrame(JFrame owner) {
    super(owner, "注册新用户", true);
    setSize(420, 300);
    setLocationRelativeTo(owner);

    JPanel p = new JPanel(new GridLayout(7, 2, 6, 6));
    p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
    p.add(new JLabel("用户名:"));
    usernameField = new JTextField();
    p.add(usernameField);

    p.add(new JLabel("邮箱（接收注册码）:"));
    emailField = new JTextField();
    p.add(emailField);

    p.add(new JLabel("密码 (6-10位，需含大小写与数字):"));
    pwdField = new JPasswordField();
    p.add(pwdField);

    p.add(new JLabel("再次输入密码:"));
    pwdField2 = new JPasswordField();
    p.add(pwdField2);

    p.add(new JLabel("请输入注册码:"));
    codeField = new JTextField();
    p.add(codeField);

    JButton sendCodeBtn = new JButton("发送注册码");
    p.add(sendCodeBtn);

    p.add(new JLabel());

    JButton regBtn = new JButton("注册");
    p.add(regBtn);
    JButton cancelBtn = new JButton("取消");
    p.add(cancelBtn);

    add(p);

    sendCodeBtn.addActionListener(e -> {
      String email = emailField.getText().trim();
      if (email.isEmpty() || !isValidEmail(email)) {
        JOptionPane.showMessageDialog(this, "请输入有效邮箱");
        return;
      }

      if(Login.isEmailExists(email)){
        JOptionPane.showMessageDialog(this,"该邮箱已经被注册，请使用其他邮箱");
        return;
      }

      lastCode = String.format("%04d", new Random().nextInt(10000));
      boolean sent = sendEmail(email, lastCode);
      if (sent) {
        JOptionPane.showMessageDialog(this, "注册码已发送，请检查邮箱。");
      } else {
        JOptionPane.showMessageDialog(this, "发送邮件失败，请检查网络或邮箱配置。");
      }
    });

    regBtn.addActionListener(e -> {
      String u = usernameField.getText().trim();
      String email = emailField.getText().trim();
      String pwd = new String(pwdField.getPassword()).trim();
      String pwd2 = new String(pwdField2.getPassword()).trim();
      String code = codeField.getText().trim();

      if (u.isEmpty() || email.isEmpty() || pwd.isEmpty() || pwd2.isEmpty() || code.isEmpty()) {
        JOptionPane.showMessageDialog(this, "请填写完整信息并输入注册码");
        return;
      }
      if(Login.isEmailExists(email)){
        JOptionPane.showMessageDialog(this,"该邮箱已被注册，请使用其他邮箱");
        return;
      }
      if (!code.equals(lastCode)) {
        JOptionPane.showMessageDialog(this, "注册码错误，请重新输入");
        return;
      }
      if (!pwd.equals(pwd2)) {
        JOptionPane.showMessageDialog(this, "两次密码不一致");
        return;
      }
      if (!Login.validatePasswordRules(pwd)) {
        JOptionPane.showMessageDialog(this, "密码不满足要求：6-10位且包含大写、小写和数字");
        return;
      }

      Login.Level lv = Login.Level.PRIMARY;

      boolean ok = Login.register(u, pwd, lv, email);
      if (!ok) {
        JOptionPane.showMessageDialog(this, "用户名或邮箱已存在，请换一个用户名");
        return;
      }
      JOptionPane.showMessageDialog(this, "注册成功，请用新用户登录");
      dispose();
    });

    cancelBtn.addActionListener(e -> dispose());

    setVisible(true);
  }

  private boolean sendEmail(String to, String code) {
    try {
      Properties props = new Properties();
      props.put("mail.smtp.host", "smtp.qq.com");
      props.put("mail.smtp.port", "465");
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.ssl.enable", "true"); // ← 开启 SSL

      Session session = Session.getInstance(props, new Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
          return new PasswordAuthentication(FROM_EMAIL, AUTH_CODE);
        }
      });

      Message message = new MimeMessage(session);
      message.setFrom(new InternetAddress(FROM_EMAIL));
      message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
      message.setSubject("数学卷子生成器 - 注册验证码");
      message.setText("您的注册码为: " + code + "\n有效期 5 分钟。");

      Transport.send(message);
      return true;
    } catch (Exception e) {
      e.printStackTrace();
      return false;
    }
  }
}