import { transport } from "./mailer";
import { buildLegalFooterLines, renderVerificationEmailHtml } from "./emailTemplates";
import { getSellerForInvoice } from "./invoiceData";

// Fire-and-forget by design — callers should not await this in a way that
// blocks or fails the actual error response the customer sees. Wrap
// everything in its own try/catch so a broken mail relay never becomes a
// second, worse failure on top of the one being reported. Internal-only
// (sent to admin@mk360.de, this business's own inbox), but still carries
// the plain-text Anbieterkennzeichnung for consistency with every other
// email this app sends — see buildLegalFooterLines() in emailTemplates.ts.
export function sendCriticalAlert(subject: string, details: Record<string, unknown>): void {
  getSellerForInvoice()
    .catch(() => null)
    .then((seller) => {
      const footer = buildLegalFooterLines(seller).join("\n");
      return transport.sendMail({
        from: '"einfach produktiv Alerts" <admin@mk360.de>',
        to: "admin@mk360.de",
        subject: `[einfach produktiv] ${subject}`,
        text: `${JSON.stringify(details, null, 2)}\n\n---\n${footer}`,
      });
    })
    .catch((err) => {
      console.error("sendCriticalAlert: failed to send alert email", err);
    });
}

// The *initial* verification email (on registration) is sent by Payload
// itself, via Customers.ts's own afterChange hook — that one fires
// automatically on create and needs no separate wiring. This one is only
// for the "erneut senden" resend path (app/api/account/resend-verification/
// route.ts), which updates the token via the customer's own session
// (app/lib/customerAuth.ts's resendVerificationEmail) but has no Payload
// hook to piggyback on for a plain update, so it sends directly instead —
// same Hostinger transport as the alert above, and the same branded
// emailShell()/legal-footer template as every other email (see
// renderVerificationEmailHtml in emailTemplates.ts).
export async function sendVerificationEmail(to: string, firstName: string, token: string): Promise<void> {
  const url = `https://einfach-produktiv.mk360.de/api/account/verify-email?token=${token}`;
  const seller = await getSellerForInvoice();
  await transport.sendMail({
    // See orderEmail.ts's own comment — From now matches sellerEmail
    // itself since the SMTP account moved to a mailbox on that domain,
    // and emailFromName/emailFromAddress let an admin override both.
    from: `"${seller?.emailFromName || seller?.sellerName || "Björn"}" <${seller?.emailFromAddress || seller?.sellerEmail || "hallo@einfach-produktiv.com"}>`,
    replyTo: seller?.sellerEmail || undefined,
    to,
    subject: "Bitte bestätige deine E-Mail-Adresse",
    html: renderVerificationEmailHtml(firstName, url, seller),
  });
}