// Грубое определение страны по тегу сервера и/или хосту.
// Это эвристика — мы не делаем GeoIP-lookup.

const COUNTRIES = [
  { re: /\b(ru|россия|russia|moscow|spb)\b/i, code: "RU", flag: "🇷🇺" },
  { re: /\b(de|germany|frankfurt|berlin|deu)\b/i, code: "DE", flag: "🇩🇪" },
  { re: /\b(nl|netherlands|amsterdam|holland)\b/i, code: "NL", flag: "🇳🇱" },
  {
    re: /\b(us|usa|america|new[-_ ]?york|chicago|miami)\b/i,
    code: "US",
    flag: "🇺🇸",
  },
  { re: /\b(uk|britain|london|england)\b/i, code: "GB", flag: "🇬🇧" },
  { re: /\b(fr|france|paris)\b/i, code: "FR", flag: "🇫🇷" },
  { re: /\b(jp|japan|tokyo)\b/i, code: "JP", flag: "🇯🇵" },
  { re: /\b(sg|singapore)\b/i, code: "SG", flag: "🇸🇬" },
  { re: /\b(hk|hongkong|hong[-_ ]?kong)\b/i, code: "HK", flag: "🇭🇰" },
  { re: /\b(fi|finland|helsinki)\b/i, code: "FI", flag: "🇫🇮" },
  { re: /\b(se|sweden|stockholm)\b/i, code: "SE", flag: "🇸🇪" },
  { re: /\b(pl|poland|warsaw)\b/i, code: "PL", flag: "🇵🇱" },
  { re: /\b(tr|turkey|istanbul)\b/i, code: "TR", flag: "🇹🇷" },
  { re: /\b(ua|ukraine|kiev|kyiv)\b/i, code: "UA", flag: "🇺🇦" },
];

export function detectCountry(...inputs) {
  const text = inputs.filter(Boolean).join(" ").toLowerCase();
  for (const c of COUNTRIES) {
    if (c.re.test(text)) return c;
  }
  return null;
}

export function flagFor(server) {
  if (!server) return "";
  const detected = detectCountry(server.tag, server.server);
  return detected?.flag || "🌐";
}