server.js

import express from 'express';
import cors from 'cors';
import { Resend } from 'resend';

const app = express();
const PORT = 3001;

// Initialize Resend with your API key
const resend = new Resend('re_XiNEHU2C_PqTmd21U8xTrfsRWqfMe2Z1R');

// Middleware
app.use(cors());
app.use(express.json({ limit: '10mb' })); // Increase limit for large HTML emails

// Health check endpoint
app.get('/api/health', (req, res) => {
  res.json({ status: 'ok', message: 'Email API server is running' });
});

// Send test email endpoint
app.post('/api/send-test-email', async (req, res) => {
  try {
    const { to, subject, from, html } = req.body;

    // Validate required fields
    if (!to || !subject || !html) {
      return res.status(400).json({
        error: 'Missing required fields',
        required: ['to', 'subject', 'html'],
      });
    }

    // Validate email format
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (!emailRegex.test(to)) {
      return res.status(400).json({
        error: 'Invalid email address format',
      });
    }

    console.log('📧 Sending email via Resend...');
    console.log('To:', to);
    console.log('Subject:', subject);
    console.log('From:', from || 'onboarding@resend.dev');

    // Send email using Resend
    // Note: For testing, we must use onboarding@resend.dev
    // Custom domains need to be verified in Resend dashboard
    const data = await resend.emails.send({
      from: 'onboarding@resend.dev', // Must use verified domain
      to: to, // This sends to the email address entered by the user
      subject: subject,
      html: html,
      reply_to: from, // Set reply-to to the original from address
    });

    console.log('✅ Email sent successfully!');
    console.log('Response:', data);
    console.log('📬 Email should arrive at:', to);
    
    // Check if email was sent to the intended recipient
    if (data.id) {
      console.log('✅ Resend Email ID:', data.id);
      console.log('🔍 Track this email in Resend dashboard: https://resend.com/emails/' + data.id);
    }

    res.json({
      success: true,
      message: 'Email sent successfully',
      data: data,
    });
  } catch (error) {
    console.error('❌ Error sending email:', error);
    
    res.status(500).json({
      error: 'Failed to send email',
      message: error.message,
      details: error.response?.data || error,
    });
  }
});

// Start server
app.listen(PORT, () => {
  console.log('🚀 Email API Server Started!');
  console.log(`📍 Server running on http://localhost:${PORT}`);
  console.log(`📧 Resend API configured and ready`);
  console.log(`\n✅ Ready to send emails from your email builder!`);
});