// /**
//  * File: RFC1213.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.Net;
using System.Collections.Generic;
using ln.snmp.endpoint;
using ln.snmp.types;
using System.Linq;
using ln.types;
using ln.logging;
using ln.types.net;
namespace ln.snmp.rfc1213
{
    public static class RFC1213
    {

        public static Interface[] GetInterfaces(SnmpInterface endpoint)
        {
            Dictionary<int,Interface> interfaces = new Dictionary<int,Interface>();
            ObjectIdentifier baseOID = new ObjectIdentifier("1.3.6.1.2.1.2.2.1.2");

            Sequence[][] ifTable = endpoint.snmpWalk(new String[] {
                    "1.3.6.1.2.1.2.2.1.2",
                    "1.3.6.1.2.1.2.2.1.6"
                    });

            foreach (Sequence[] row in ifTable)
            {
                ObjectIdentifier index = (row[0].Items[0] as ObjectIdentifier);

                Interface intf = new Interface();
                intf.Name = (row[0].Items[1] as OctetString).StringValue;
                if (row[1] != null)
                    intf.HWAddr = BitConverter.ToString((row[1].Items[1] as OctetString).Bytes);
                else
                    intf.HWAddr = "";

                interfaces.Add(index.OIDValue[0],intf);
            }

            Sequence[][] ipTable = endpoint.snmpWalk(new String[]
            {
                "1.3.6.1.2.1.4.20.1.1",
                "1.3.6.1.2.1.4.20.1.2",
                "1.3.6.1.2.1.4.20.1.3"
            });

            foreach (Sequence[] row in ipTable)
            {
                IPAddress ip = (row[0].Items[1] as IPAddr).IP;
                int ifIndex = (int)(row[1].Items[1] as Integer).LongValue;
                IPAddress mask = (row[2].Items[1] as IPAddr).IP;

                if (interfaces.ContainsKey(ifIndex))
                {
                    IPv4 ipv4 = ip;
                    IPv4 mask4 = mask;
                    interfaces[ifIndex].Add(ipv4,mask4);
                }
            }

            return interfaces.Values.ToArray();
        }


        public class Interface
        {
            public String Name { get; set; }
            public String HWAddr { get => hwaddr; set => hwaddr = value; }
            public IPv4[] IPAddresses => _IPAddresses.ToArray();
            public IPv4[] Netmasks => _Netmasks.ToArray();

            private List<IPv4> _IPAddresses = new List<IPv4>();
            private List<IPv4> _Netmasks = new List<IPv4>();
            private String hwaddr;

            public Interface()
            {
            }

            public void Add(IPv4 ip,IPv4 netmask)
            {
                _IPAddresses.Add(ip);
                _Netmasks.Add(netmask);
            }

            public override string ToString()
            {
                return String.Format("[Interface Name={0} IPAddresses=({1})]",Name,String.Join(", ",IPAddresses.Select((x)=>x.ToString())));
            }
        }




    }
}