import os from 'os';

const localIpv4 = '127.0.0.1';

const getIpv4Interfaces = (): os.NetworkInterfaceInfo[] => {
  try {
    const interfaces = os.networkInterfaces();
    const ipv4Interfaces: os.NetworkInterfaceInfo[] = [];

    Object.values(interfaces).forEach((detail) => {
      detail?.forEach((detail) => {
        // 'IPv4' is in Node <= 17, from 18 it's a number 4 or 6
        const familyV4Value = typeof detail.family === 'string' ? 'IPv4' : 4;

        if (detail.family === familyV4Value && detail.address !== localIpv4) {
          ipv4Interfaces.push(detail);
        }
      });
    });
    return ipv4Interfaces;
  } catch (_err) {
    return [];
  }
};

const getIPV4 = (): string => {
  const ipv4Interfaces = getIpv4Interfaces();
  const ipv4Interface = ipv4Interfaces[0] || { address: localIpv4 };
  return ipv4Interface.address;
};

export { getIPV4 };