/*************************************************************************
 * ModernUO                                                              *
 * Copyright 2019-2026 - ModernUO Development Team                       *
 * Email: hi@modernuo.com                                                *
 * File: CidrFirewallEntry.cs                                            *
 *                                                                       *
 * This program is free software: you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation, either version 3 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *************************************************************************/

using System;
using System.Net;
using System.Net.Sockets;

namespace Server.Network;

public class CidrFirewallEntry : BaseFirewallEntry
{
    public override UInt128 MinIpAddress { get; }
    public override UInt128 MaxIpAddress { get; }

    public CidrFirewallEntry(string ipAddressOrCidr)
    {
        // Core owns the CIDR -> normalized range parse.
        if (!IPAddressUtility.TryParseCidrRange(ipAddressOrCidr, out var min, out var max))
        {
            throw new ArgumentException("Invalid IP address or CIDR.", nameof(ipAddressOrCidr));
        }

        MinIpAddress = min;
        MaxIpAddress = max;
    }

    public CidrFirewallEntry(IPAddress minAddress, IPAddress maxAddress)
    {
        MinIpAddress = minAddress.ToUInt128();
        MaxIpAddress = maxAddress.ToUInt128();
    }

    public CidrFirewallEntry(IPAddress ipAddress, int prefixLength)
    {
        Span<byte> bytes = stackalloc byte[16];

        if (ipAddress.AddressFamily != AddressFamily.InterNetworkV6)
        {
            prefixLength += 96; // 32 -> 128
        }

        ipAddress.WriteMappedIPv6To(bytes);

        MinIpAddress = Utility.CreateCidrAddress(bytes, prefixLength, false);
        MaxIpAddress = Utility.CreateCidrAddress(bytes, prefixLength, true);
    }

}