@ideal-photography/shared/utils/mail.resend.js

Shared MongoDB and utility logic for Ideal Photography PWAs: users, products, services, bookings, orders/cart, galleries, reviews, notifications, campaigns, settings, audit logs, minimart items/orders, and push notification subscriptions.

import { Resend } from 'resend';

const RESEND_API_KEY = process.env.RESEND_API_KEY || '';
const DEFAULT_FROM = process.env.EMAIL_FROM || '';

let resendClient = null;

function getResendClient() {
    if (resendClient) return resendClient;
    if (!RESEND_API_KEY) {
        throw new Error('RESEND_API_KEY is missing. Please set it in your environment.');
    }
    resendClient = new Resend(RESEND_API_KEY);
    return resendClient;
}

export async function sendMail({ to, subject, html, text, from, replyTo, bcc, cc, attachments, headers, tags }) {
    const resend = getResendClient();
    const payload = {
        from: from || DEFAULT_FROM,
        to,
        subject,
        ...(html && { html }),
        ...(text !== undefined ? { text } : {}),
        ...(replyTo && { replyTo }),
        ...(bcc && { bcc }),
        ...(cc && { cc }),
        ...(attachments && attachments.length ? { attachments } : {}),
        ...(headers && Object.keys(headers).length ? { headers } : {}),
        ...(tags && tags.length ? { tags } : {}),
    };

    const { data, error } = await resend.emails.send(payload);
    if (error) {
        // Ensure we throw to propagate failure to callers
        throw error;
    }
    // Normalize to prior shape where callers may expect messageId
    return { id: data?.id, messageId: data?.id };
}

export async function sendBatch(emails) {
    const resend = getResendClient();
    if (!Array.isArray(emails)) {
        throw new Error('sendBatch expects an array of email payloads');
    }
    // Each item should match the sendMail payload fields
    const { data, error } = await resend.batch.send(
        emails.map(e => ({
            from: e.from || DEFAULT_FROM,
            to: e.to,
            subject: e.subject,
            ...(e.html && { html: e.html }),
            ...(e.text !== undefined ? { text: e.text } : {}),
            ...(e.replyTo && { replyTo: e.replyTo }),
            ...(e.bcc && { bcc: e.bcc }),
            ...(e.cc && { cc: e.cc }),
            ...(e.attachments && e.attachments.length ? { attachments: e.attachments } : {}),
            ...(e.headers && Object.keys(e.headers).length ? { headers: e.headers } : {}),
            ...(e.tags && e.tags.length ? { tags: e.tags } : {}),
        }))
    );
    if (error) throw error;
    return data;
}