emailService.js

const sgMail = require('@sendgrid/mail');
sgMail.setApiKey(process.env.SENDGRID_API_KEY);

/**
 * Send an email using SendGrid
 * @param {string} to - Recipient email address
 * @param {string} subject - Email subject
 * @param {string} text - Plain text content
 * @param {string} html - HTML content
 */
async function sendEmail(to, subject, text, html, templateId = null, dynamicTemplateData = {}) {
    try {
        const msg = {
            to,
            from: process.env.SENDER_EMAIL,
            subject,
            text,
            html,
            templateId,
            dynamic_template_data: dynamicTemplateData,
        };
        const response = await sgMail.send(msg);
        console.log('Email sent', response);
    } catch (error) {
        console.error('Error sending email', error);
    }
}

/**
 * Track email analytics
 * @param {object} eventData - Event data from email service
 */
function trackEmailAnalytics(eventData) {
    // Log event or send to analytics service
    console.log('Email event:', eventData);
}

module.exports = {
    sendEmail,
    trackEmailAnalytics,
};