/*
 * 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 System.Diagnostics;
using System.Net.Sockets;
using FlaUI.Core.Tools;
using NUnit.Framework;

namespace ProtonVPN.UI.Tests.TestsHelper;

public static class CommonAssertions
{
    public static void AssertDnsIsResolved(string url)
    {
        RetryResult<bool> retry = Retry.WhileFalse(() =>
        {
            return TryToResolveDns(url);
        },
        TestConstants.TenSecondsTimeout, TestConstants.RetryInterval);

        Assert.That(retry.Result, Is.True, $"Dns was not resolved for {url}.");
    }

    public static void AssertAtLeastOneDomainResolved(string[] domains)
    {
        foreach (string domain in domains)
        {
            RetryResult<bool> retry = Retry.WhileFalse(() => TryToResolveDns(domain),
                TestConstants.TenSecondsTimeout, TestConstants.RetryInterval);

            if (retry.Result)
            {
                return; // at least one resolved, we're done
            }
        }

        throw new System.Exception($"None of the expected domains resolved: {string.Join(", ", domains)}");
    }

    public static void AssertDnsIsNotResolved(string url)
    {
        RetryResult<bool> retry = Retry.WhileTrue(() =>
        {
            return TryToResolveDns(url);
        },
        TestConstants.TenSecondsTimeout, TestConstants.RetryInterval);

        Assert.That(retry.Result, Is.True, $"DNS was resolved for {url}");
    }

    public static void AssertIpAddressChanged(string previousIpAddress)
    {
        RetryResult<bool> retry = Retry.WhileTrue(() =>
        {
            string currentIpAddress = NetworkUtils.GetIpAddressWithRetry();
            return currentIpAddress == previousIpAddress;
        },
        TestConstants.TenSecondsTimeout, TestConstants.RetryInterval);

        Assert.That(retry.Result, Is.True, $"IP Address has not changed from {previousIpAddress}");
    }

    public static void AssertIpAddressUnchanged(string previousIpAddress)
    {
        RetryResult<bool> retry = Retry.WhileFalse(() =>
        {
            string currentIpAddress = NetworkUtils.GetIpAddressWithRetry();
            return currentIpAddress == previousIpAddress;
        },
        TestConstants.TenSecondsTimeout, TestConstants.RetryInterval);

        Assert.That(retry.Result, Is.True, $"IP Address has changed from {previousIpAddress}");
    }

    private static bool TryToResolveDns(string url)
    {
        try
        {
            System.Net.Dns.GetHostEntry(url);

            return true;
        }
        catch (SocketException)
        {
            return false;
        }
    }

    public static void VerifyAppIsNotRunning()
    {
        Process[] processes = Process.GetProcessesByName("ProtonVPN.Client");
        Assert.That(processes.Length == 0, Is.True);
    }
}