import nodemailer from 'nodemailer';

// Returns an async send(to, subject, body) function.
// If smtp_config is absent, returns a stub that always throws.
export function create_mailer(smtp_config) {
	if (!smtp_config) {
		return async () => {
			throw new Error('SMTP not configured');
		};
	}

	const { from, ...transport_config } = smtp_config;
	const transporter = nodemailer.createTransport(transport_config);

	return async function send(to, subject, body) {
		await transporter.sendMail({ from, to, subject, text: body });
	};
}