using System;
using System.Net;

namespace ln.type
{
    public class IPv4
    {
        public static readonly IPv4 ANY = new IPv4();
        
        private UInt32 _ip;
        private IPv4()
        {
        }
        public IPv4(UInt32 ip)
        {
            _ip = ip;
        }

        public IPv4(byte[] ipbytes)
        {
            _ip = BitConverter.ToUInt32(ipbytes, 0);
        }

        public byte[] ToBytes => BitConverter.GetBytes(_ip);

        public override bool Equals(Object obj) => (obj is IPv4 other) && _ip == other._ip;
        public override int GetHashCode() => (int)_ip;

        public override string ToString()
        {
            byte[] ipbytes = ToBytes;
            return string.Format("{0}.{1}.{2}.{3}", ipbytes[3], ipbytes[2], ipbytes[1], ipbytes[0]);
        }

        public static IPv4 operator ++(IPv4 ip) => new IPv4(ip._ip + 1);
        public static IPv4 operator --(IPv4 ip) => new IPv4(ip._ip - 1);

        public static IPv4 operator +(IPv4 ip, int n) => new IPv4((uint)(ip._ip + n));
        public static IPv4 operator -(IPv4 ip, int n) => new IPv4((uint)(ip._ip - n));

        public static implicit operator IPAddress(IPv4 ipv4) => new IPAddress(ipv4.ToBytes);
        public static implicit operator IPv4(IPAddress ipAddress) => new IPv4(ipAddress.GetAddressBytes());

    }
}