/*
 * Copyright (c) 2025 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 ProtonVPN.Common.Core.Extensions;
using ProtonVPN.Common.Core.Networking;

namespace ProtonVPN.Vpn.Management;

/// <summary>
/// Message received over OpenVPN management interface.
/// </summary>
public class ReceivedManagementMessage
{
    private readonly string _messageText;

    public ReceivedManagementMessage(string messageText)
    {
        _messageText = messageText ?? "";
    }

    public override string ToString() => _messageText;

    public bool IsChannelDisconnected => _messageText.IsNullOrEmpty();

    public bool IsWaitingHoldRelease => _messageText.StartsWithIgnoringCase(">HOLD");

    public bool IsEchoSet => _messageText.StartsWithIgnoringCase("SUCCESS: real-time echo notification set");

    public bool IsStateSet => _messageText.StartsWithIgnoringCase("SUCCESS: real-time state notification set");

    public bool IsByteCountSet => _messageText.StartsWithIgnoringCase("SUCCESS: bytecount");

    public bool IsUsernameNeeded => _messageText.StartsWithIgnoringCase(">PASSWORD:Need");

    public bool IsPasswordNeeded => _messageText.StartsWithIgnoringCase("SUCCESS: 'Auth' username entered");

    public bool IsLogSet => _messageText.StartsWithIgnoringCase("SUCCESS: real-time log notification set");

    public bool IsByteCount => _messageText.StartsWithIgnoringCase(">BYTECOUNT");

    public bool IsState => _messageText.StartsWithIgnoringCase(">STATE");

    public bool IsError => ManagementError.ContainsError(_messageText);

    public bool IsDisconnectReceived => _messageText.StartsWithIgnoringCase("SUCCESS: signal SIGTERM thrown");

    public bool IsControlMessage => _messageText.ContainsIgnoringCase("PUSH: Received control message");

    public NetworkTraffic Bandwidth()
    {
        string[] byteCountArr = _messageText.Split(':')[1].Split(',');
        if (byteCountArr.Length <= 1)
        {
            return NetworkTraffic.Zero;
        }

        if (!ulong.TryParse(byteCountArr[0], out ulong bytesIn))
        {
            return NetworkTraffic.Zero;
        }

        if (!ulong.TryParse(byteCountArr[1], out ulong bytesOut))
        {
            return NetworkTraffic.Zero;
        }

        return new NetworkTraffic(bytesIn, bytesOut);
    }

    public ManagementState State()
    {
        string[] messageParts = _messageText.Split(',');
        if (messageParts.Length <= 1)
        {
            return ManagementState.Null;
        }

        string stateText = messageParts[1];
        string statusText = messageParts.Length > 2 ? messageParts[2] : "";
        string localIpAddress = messageParts.Length > 3 ? messageParts[3] : "";
        string remoteIpAddress = messageParts.Length > 4 ? messageParts[4] : "";

        return new ManagementState(stateText, statusText, localIpAddress, remoteIpAddress);
    }

    public ManagementError Error()
    {
        return new ManagementError(_messageText);
    }
}