/*
 * Copyright (c) 2023 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN 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.
 *
 * ProtonVPN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using System;

namespace ProtonVPN.Common.Legacy.PortForwarding;

public class MappedPort : IEquatable<MappedPort>, IComparable<MappedPort>
{
    public int InternalPort { get; }
    public int ExternalPort { get; }

    public MappedPort(int internalPort, int externalPort)
    {
        InternalPort = internalPort;
        ExternalPort = externalPort;
    }

    public bool Equals(MappedPort other)
    {
        return InternalPort == other?.InternalPort && ExternalPort == other.ExternalPort;
    }

    public override bool Equals(object other)
    {
        return other is MappedPort port && Equals(port);
    }

    public override int GetHashCode()
    {
        return InternalPort.GetHashCode() ^ ExternalPort.GetHashCode();
    }

    public static bool operator ==(MappedPort left, MappedPort right)
    {
        return IsEqual(left, right);
    }

    private static bool IsEqual(MappedPort left, MappedPort right)
    {
        return left is null && right is null || left is not null && left.Equals(right);
    }

    public static bool operator !=(MappedPort left, MappedPort right)
    {
        return !IsEqual(left, right);
    }

    public int CompareTo(MappedPort other)
    {
        if (ReferenceEquals(this, other))
        {
            return 0;
        }
        if (other is null)
        {
            return 1;
        }
        int internalPortComparison = InternalPort.CompareTo(other.InternalPort);
        return internalPortComparison != 0 ? internalPortComparison : ExternalPort.CompareTo(other.ExternalPort);
    }

    public override string ToString()
    {
        return $"{InternalPort}->{ExternalPort}";
    }
}