import nodemailer from "nodemailer";

export interface ContactMessage {
  email: string;
  message: string;
  name?: string;
  /** Optional context, e.g. the search dates that had no availability. */
  context?: string;
}

function getTransport() {
  const { SMTP_HOST, SMTP_PORT, SMTP_USER, SMTP_PASSWORD } = process.env;
  if (!SMTP_HOST || !SMTP_USER || !SMTP_PASSWORD) {
    return null;
  }

  return nodemailer.createTransport({
    host: SMTP_HOST,
    port: Number(SMTP_PORT) || 587,
    secure: Number(SMTP_PORT) === 465,
    auth: {
      user: SMTP_USER,
      pass: SMTP_PASSWORD,
    },
  });
}

export async function sendContactMessage(data: ContactMessage): Promise<void> {
  const transport = getTransport();
  const to = process.env.CONTACT_INBOX_EMAIL || "info@bb-apartment.de";
  const from = process.env.SMTP_FROM || "noreply@bb-apartment.de";

  const subject = `Neue Kontaktanfrage von ${data.name || data.email}`;
  const text = [
    data.context ? `Kontext: ${data.context}` : null,
    `Name: ${data.name || "-"}`,
    `E-Mail: ${data.email}`,
    "",
    data.message,
  ]
    .filter(Boolean)
    .join("\n");

  if (!transport) {
    // No SMTP configured yet (development) — log instead of failing so the
    // form still "works" locally.
    console.log("[contact] SMTP not configured, would have sent:", {
      to,
      from,
      subject,
      text,
    });
    return;
  }

  await transport.sendMail({
    to,
    from,
    replyTo: data.email,
    subject,
    text,
  });
}