import "server-only";

const FROM = "Buzz Guide <no-reply@sudloh.com>";

export async function sendAuthEmail(to: string, subject: string, text: string): Promise<void> {
  const apiKey = process.env.RESEND_API_KEY;
  if (!apiKey) throw new Error("RESEND_API_KEY is required for authentication email.");

  const response = await fetch("https://api.resend.com/emails", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${apiKey}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ from: FROM, to: [to], subject, text }),
  });
  if (!response.ok) throw new Error(`Authentication email delivery failed (${response.status}).`);
}