global using System;
global using System.Collections.Generic;
global using System.Threading;
global using System.Threading.Tasks;
using System.Net;
using System.Net.Security;

namespace Meum.Core;

public static class Network
{
    public static readonly SslApplicationProtocol[] ApplicationProtocols =
    [
        new("Meum-1")
    ];

    public const int ServerPortDefault = 9320;
    public const long DefaultStreamErrorCode = 0xA;
    public const long DefaultCloseErrorCode = 0xB;


    public static bool IsValidDomainName(string name)
    {
        return Uri.CheckHostName(name) != UriHostNameType.Unknown;
    }
    
    public static DnsEndPoint ParseDnsEndPoint(string address_str)
    {
        string host;
        int port;
        int colon_index = address_str.IndexOf(':');
        if (colon_index == -1)
        {
            host = address_str;
            port = ServerPortDefault;
        }
        else
        {
            host = address_str.Substring(0, colon_index);
            port = Convert.ToInt32(address_str.Substring(colon_index + 1));
        }
        if(!IsValidDomainName(host))
            throw new ArgumentException($"Invalid domain name '{host}'");
        
        return new DnsEndPoint(host, port);
    }
}