using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;




namespace ServerCore;

//=============================================================================================
// Network Interface 관련 정보를 조건에 해당하는 정보만 로딩하여 보관해 주는 클래스 이다.
//
// author : kangms
// 
//=============================================================================================

public class NetInterface
{
    public string m_desc = "";
    public string m_ip = "";
    public string m_ipv6 = "";
}

public class NetInterfaceManager
{
    // ni num, address 
    private List<NetInterface> m_nics = new List<NetInterface>();
    private string m_ip_addresses = string.Empty;

    public NetInterfaceManager()
    {
        init();
    }

    public void init()
    {
        m_nics.Clear();

        // Ethernet의 ipv6, ipv4 주소만 수집한다. 
        var nics = NetworkInterface.GetAllNetworkInterfaces();
        foreach (var ni in nics)
        {
            if (ni.NetworkInterfaceType == NetworkInterfaceType.Ethernet ||
                ni.NetworkInterfaceType == NetworkInterfaceType.Loopback)
            {
                bool has_info = false;
                NetInterface nic = new NetInterface();
                nic.m_desc = ni.Description;

                var unicast_addresses = ni.GetIPProperties().UnicastAddresses;
                foreach (var ip_info in unicast_addresses)
                {
                    if (ip_info.Address.AddressFamily == AddressFamily.InterNetwork)
                    {
                        nic.m_ip = ip_info.Address.ToString();
                        has_info = true;
                        m_ip_addresses += nic.m_ip;
                    }
                    else if (ip_info.Address.AddressFamily == AddressFamily.InterNetworkV6)
                    {
                        // 추가하자.
                        nic.m_ipv6 = ip_info.Address.ToString();
                        has_info = true;
                    }
                }

                if (has_info)
                {
                    add(nic);
                }
            }
        }

    }

    public void add(NetInterface nic)
    {
        m_nics.Add(nic);
    }

    public NetInterface find(string address)
    {
        foreach (var nic in m_nics)
        {
            if (   nic.m_ip == address
                || nic.m_ipv6 == address )
            {
                return nic;
            }
        }
        return new NetInterface();
    }

    public string getIPAddresses() => m_ip_addresses;

    public List<NetInterface> getNetInterfaces() => m_nics;
}