import "server-only";

import { getVisitorTrackingConfig } from "@/lib/config/server";
import { getRedisClient } from "@/lib/redis";
import {
  getClientAddress,
  hashClientAddress,
} from "@/lib/visitor/visitor-identifiers";

const VISITOR_SET_KEY = "erika:unique_visitors:v2";

export async function trackUniqueVisitor(headers: Headers) {
  const client = await getRedisClient();
  const address = getClientAddress(headers);

  if (address) {
    const { secret } = getVisitorTrackingConfig();
    await client.sadd(VISITOR_SET_KEY, hashClientAddress(address, secret));
  }

  return client.scard(VISITOR_SET_KEY);
}