using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace IRCRobots
{
    public class ConnectionParams
    {
        public string Nickname { get; set; }
        public string Host { get; set; }
        public int Port { get; set; }
        public bool UseTLS { get; set; }
        public string? Username { get; set; } = null;
        public string? Realname { get; set; } = null;
        public string? Bindhost { get; set; } = null;
        public string? Password { get; set; } = null;
        public bool VerifyTLS { get; set; } = true;
        public SASLParams? SASL { get; set; } = null;
        public STSPolicy? STS { get; set; } = null;
        public ResumePolicy? Resume { get; set; } = null;
        public int Reconnect { get; set; } = 10; // seconds
        public IEnumerable<string> AltNicknames { get; set; } = new List<string>();
        public IEnumerable<string> Autojoin { get; set; } = new List<string>();

        public static ConnectionParams FromHostString(string nickName, string hostString)
        {
            var result     = new ConnectionParams {Nickname = nickName};
            var ipv6host   = Regex.Matches(hostString, @"\[([a-fA-F0-9:]+)\]").SingleOrDefault();
            var portString = "";
            if (ipv6host is { Index: 0 })
            {
                result.Host = ipv6host.Groups[0].Value;
                portString  = hostString[(ipv6host.Index + ipv6host.Length)..];
            }
            else
            {
                var s = hostString.Split(':', 2);
                result.Host = s[0];
                portString  = s[1];
            }

            if (string.IsNullOrWhiteSpace(portString))
            {
                portString    = "6667";
                result.UseTLS = false;
            }
            else
            {
                result.UseTLS    = portString.StartsWith('+') || portString.StartsWith('~');
                result.VerifyTLS = portString.StartsWith('~');
                portString       = portString[1..];
            }

            result.Port     = int.Parse(portString);
            
            return result;
        }
    }
}