import { headers } from "next/headers";

// Data
import citiesData from "@/data/city.json";
import statesData from "@/data/state.json";
import { fetchReq } from "@/lib/req";

import { ROOT_CITY_ID, isRootCity } from "@/lib/rootCity";
export { ROOT_CITY_ID, isRootCity };

const API_URL = process.env.NEXT_PUBLIC_API_URL;

// دامنه‌های خارج از city.json (دامنه اختصاصی نمایندگان سراسری) از backend پرسیده می‌شوند
// (GET /api/v1/site-context). cache ماژول‌سطح تا هر render یک درخواست نزند؛
// خطای شبکه هرگز صفحه را نمی‌شکند (null = مثل دامنه ناشناخته).
const SITE_CONTEXT_TTL_MS = 5 * 60 * 1000;
const siteContextCache = new Map();

async function fetchSiteContext(host) {
  if (!host || host === "localhost" || host === "127.0.0.1" || !API_URL) return null;

  const cached = siteContextCache.get(host);
  if (cached && cached.expires > Date.now()) return cached.value;

  let value = null;
  try {
    const json = await fetchReq(
      `${API_URL}/api/v1/site-context?domain=${encodeURIComponent(host)}`
    );
    if (json?.data?.type === "representation") {
      value = json.data.representation; // { uuid, full_name, is_global }
    }
  } catch {
    value = null;
  }

  siteContextCache.set(host, { value, expires: Date.now() + SITE_CONTEXT_TTL_MS });
  return value;
}

export async function getStateInfo() {
  const headersList = await headers();

  const rawHost = headersList.get("host") || "";
  const host = rawHost.split(":")[0];
  const subdomain = host.split(".")[0];

  // Match city by domain (supports both full domain and subdomain)
  const matchedCity = citiesData.find((city) => {
    const cityDomain = city.domain.split(".")[0]; // Extract subdomain from domain (e.g., "yasuj-nobat" from "yasuj-nobat.ir")
    return cityDomain === subdomain;
  });

  const matchedState =
    matchedCity &&
    statesData.find((state) => state.id === matchedCity.province_id);

  // فقط وقتی هیچ شهری match نشد سراغ backend می‌رویم — رفتار دامنه‌های شهری دست‌نخورده می‌ماند.
  const repContext = matchedCity ? null : await fetchSiteContext(host);

  return {
    matchedCity,
    matchedState,
    isRoot: isRootCity(matchedCity),
    repContext,
    host,
  };
}