mailer.ts

import nodemailer from "nodemailer";

const smtpHost = process.env.SMTP_HOST;
const smtpPort = Number(process.env.SMTP_PORT ?? 587);
const smtpUser = process.env.SMTP_USER;
const smtpPass = process.env.SMTP_PASS;
const smtpFrom =
  process.env.SMTP_FROM ?? (smtpUser ? `"Auth App" <${smtpUser}>` : "no-reply@localhost");

const smtpConfigured = Boolean(smtpHost && smtpUser && smtpPass);

/**
 * If SMTP credentials are configured we send real emails through nodemailer.
 * Otherwise we fall back to nodemailer's jsonTransport, which "sends" the
 * message and lets us log it to the server console (handy for local dev).
 */
const transport = smtpConfigured
  ? nodemailer.createTransport({
      host: smtpHost,
      port: smtpPort,
      secure: smtpPort === 465,
      auth: { user: smtpUser!, pass: smtpPass! },
    })
  : nodemailer.createTransport({ jsonTransport: true });

export interface SendEmailInput {
  to: string;
  subject: string;
  html: string;
  text?: string;
}

export async function sendEmail({ to, subject, html, text }: SendEmailInput) {
  const info = await transport.sendMail({
    from: smtpFrom,
    to,
    subject,
    html,
    text: text ?? html.replace(/<[^>]*>/g, " "),
  });

  if (!smtpConfigured) {
    // Dev fallback: log the message envelope so the email is visible.
    const message = (info as unknown as { message?: string }).message;
    if (message) {
      try {
        const parsed = JSON.parse(message);
        console.log(
          `[mailer:dev] Email sent to ${to} (subject: "${subject}")\n${parsed.text ?? parsed.html ?? ""}`,
        );
      } catch {
        console.log(`[mailer:dev] Email sent to ${to} (subject: "${subject}")`);
      }
    } else {
      console.log(`[mailer:dev] Email sent to ${to} (subject: "${subject}")`);
    }
  }

  return info;
}

export function isSmtpConfigured() {
  return smtpConfigured;
}