import nodemailer from 'nodemailer';
import { config } from '../config';

let transporter: nodemailer.Transporter | null = null;

function getTransporter(): nodemailer.Transporter {
  if (!transporter) {
    if (!config.smtp.host || !config.smtp.user) {
      console.warn('SMTP not configured. Email sending disabled.');
      return null as any;
    }
    transporter = nodemailer.createTransport({
      host: config.smtp.host,
      port: config.smtp.port,
      secure: config.smtp.secure,
      auth: {
        user: config.smtp.user,
        pass: config.smtp.pass,
      },
    });
  }
  return transporter;
}

export async function sendVerificationEmail(to: string, token: string): Promise<void> {
  const transport = getTransporter();
  if (!transport) {
    console.log(`[DEV] Verification email to ${to}: ${token}`);
    return;
  }
  const verificationUrl = `${config.corsOrigin}/verify-email?token=${token}`;
  await transport.sendMail({
    from: config.smtp.from,
    to,
    subject: 'Verify your RealBlocks account',
    html: `
      <h1>Welcome to RealBlocks!</h1>
      <p>Click the link below to verify your email address:</p>
      <a href="${verificationUrl}" style="display:inline-block;padding:12px 24px;background:#4f46e5;color:#fff;text-decoration:none;border-radius:6px;">Verify Email</a>
      <p>This link expires in 24 hours.</p>
    `,
  });
}

export async function sendPasswordResetEmail(to: string, token: string): Promise<void> {
  const transport = getTransporter();
  if (!transport) {
    console.log(`[DEV] Password reset email to ${to}: ${token}`);
    return;
  }
  const resetUrl = `${config.corsOrigin}/reset-password?token=${token}`;
  await transport.sendMail({
    from: config.smtp.from,
    to,
    subject: 'Reset your RealBlocks password',
    html: `
      <h1>Password Reset Request</h1>
      <p>Click the link below to reset your password:</p>
      <a href="${resetUrl}" style="display:inline-block;padding:12px 24px;background:#4f46e5;color:#fff;text-decoration:none;border-radius:6px;">Reset Password</a>
      <p>This link expires in 1 hour. If you didn't request this, ignore this email.</p>
    `,
  });
}