import nodemailer, { type Transporter } from "nodemailer";
import { env } from "@/env";

let transporter: Transporter | null = null;

function getTransport(): Transporter | null {
  if (!env.SMTP_HOST) return null;
  if (!transporter) {
    transporter = nodemailer.createTransport({
      host: env.SMTP_HOST,
      port: env.SMTP_PORT ?? 587,
      secure: env.SMTP_SECURE,
      auth: env.SMTP_USER ? { user: env.SMTP_USER, pass: env.SMTP_PASSWORD } : undefined,
    });
  }
  return transporter;
}

/** Send an HTML email. No-ops (returns false) when SMTP isn't configured. */
export async function sendMail(to: string, subject: string, html: string): Promise<boolean> {
  const t = getTransport();
  if (!t) {
    console.warn("[email] SMTP not configured — skipping mail to", to);
    return false;
  }
  try {
    await t.sendMail({
      from: env.SMTP_FROM ?? `no-reply@${env.HOTEL_NAME}`,
      to,
      subject,
      html,
    });
    return true;
  } catch (e) {
    console.error("[email] send failed:", (e as Error).message);
    return false;
  }
}