import nodemailer from "nodemailer";

let cached: nodemailer.Transporter | null = null;

/** SMTP transporter for the existing ANOUMA mail system — no external newsletter service. */
export function getMailTransport(): nodemailer.Transporter {
  if (cached) return cached;

  const { SMTP_HOST, SMTP_PORT, SMTP_USER, SMTP_PASSWORD } = process.env;
  if (!SMTP_HOST || !SMTP_PORT || !SMTP_USER || !SMTP_PASSWORD) {
    throw new Error("SMTP_HOST, SMTP_PORT, SMTP_USER and SMTP_PASSWORD must be set to send email.");
  }

  cached = nodemailer.createTransport({
    host: SMTP_HOST,
    port: Number(SMTP_PORT),
    secure: Number(SMTP_PORT) === 465,
    auth: { user: SMTP_USER, pass: SMTP_PASSWORD },
  });
  return cached;
}

export function getMailFrom(): string {
  return process.env.SMTP_FROM || "ANOUMA <support@anouma.org>";
}