export interface GeoInfo {
  country: string;
  city: string;
}

const LOCAL_IPS = new Set(["127.0.0.1", "::1", "localhost"]);

function isLocalIp(ip: string): boolean {
  if (LOCAL_IPS.has(ip)) return true;
  if (ip.startsWith("192.168.") || ip.startsWith("10.") || ip.startsWith("172.")) return true;
  return false;
}

export async function getGeoFromIp(ip: string): Promise<GeoInfo> {
  // Strip port if present (e.g. "::ffff:1.2.3.4")
  const cleanIp = ip.replace(/^::ffff:/, "").split(",")[0].trim();

  if (isLocalIp(cleanIp)) {
    return { country: "Réseau local", city: "" };
  }

  try {
    const res = await fetch(
      `http://ip-api.com/json/${encodeURIComponent(cleanIp)}?fields=status,country,city&lang=fr`,
      { signal: AbortSignal.timeout(3000) }
    );
    if (!res.ok) throw new Error("HTTP error");
    const data = await res.json();
    if (data.status === "success") {
      return { country: data.country || "", city: data.city || "" };
    }
  } catch {
    // Geo lookup failed — non-blocking
  }

  return { country: "", city: "" };
}