import { DOMAIN, API_BASE } from "@/lib/api";

// Contact form endpoint.
// Validates the submission and — when an SMS key is configured — notifies the
// business through the Meshkee SMS gateway. Without a key it still accepts the
// message so the storefront keeps working; wire delivery by setting:
//   MESHKEE_SMS_API_KEY        server-to-server key for /public/sms/send
//   MESHKEE_CONTACT_NOTIFY_TO  phone number that should receive the alert

export const runtime = "nodejs";

const faDigits = (s) => String(s).replace(/[۰-۹]/g, (d) => "۰۱۲۳۴۵۶۷۸۹".indexOf(d));

function validate(body) {
  const name = String(body?.name || "").trim();
  const phone = faDigits(body?.phone || "").trim();
  const email = String(body?.email || "").trim();
  const message = String(body?.message || "").trim();

  const errors = {};
  if (name.length < 2) errors.name = "نام را وارد کنید";
  if (!/^0?\d{10,11}$/.test(phone.replace(/[\s-]/g, "")))
    errors.phone = "شماره تماس معتبر نیست";
  if (email && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email))
    errors.email = "ایمیل معتبر نیست";
  if (message.length < 5) errors.message = "متن پیام را وارد کنید";

  return { data: { name, phone, email, message }, errors };
}

async function notifyBusiness({ name, phone, email, message }) {
  const key = process.env.MESHKEE_SMS_API_KEY;
  const to = process.env.MESHKEE_CONTACT_NOTIFY_TO;
  if (!key || !to) return { delivered: false, reason: "not-configured" };

  const text = `پیام جدید از فرم تماس دژبند\nنام: ${name}\nتماس: ${phone}${
    email ? `\nایمیل: ${email}` : ""
  }\nپیام: ${message}`.slice(0, 600);

  try {
    const res = await fetch(`${API_BASE}/public/sms/send`, {
      method: "POST",
      headers: { "Content-Type": "application/json", "X-Api-Key": key },
      body: JSON.stringify({ domain: DOMAIN, to, message: text }),
    });
    return { delivered: res.ok, reason: res.ok ? "sent" : `sms-${res.status}` };
  } catch {
    return { delivered: false, reason: "sms-error" };
  }
}

export async function POST(request) {
  let body;
  try {
    body = await request.json();
  } catch {
    return Response.json({ ok: false, message: "درخواست نامعتبر است" }, { status: 400 });
  }

  const { data, errors } = validate(body);
  if (Object.keys(errors).length) {
    return Response.json(
      { ok: false, message: "لطفاً فیلدها را بررسی کنید", errors },
      { status: 422 }
    );
  }

  const notify = await notifyBusiness(data);

  return Response.json({
    ok: true,
    message: "پیام شما با موفقیت ثبت شد. به‌زودی همکاران ما با شما تماس می‌گیرند.",
    delivered: notify.delivered,
  });
}