/*
 * 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;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using FluentAssertions;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using ProtonVPN.Common.Core.Networking;
using ProtonVPN.Common.Legacy.Vpn;
using ProtonVPN.Vpn.Common;
using ProtonVPN.Vpn.OpenVpn.Arguments;

namespace ProtonVPN.Vpn.Tests.OpenVpn.Arguments;

[TestClass]
[SuppressMessage("ReSharper", "ReturnValueOfPureMethodIsNotUsed")]
public class EndpointArgumentsTest
{
    private readonly VpnHost _vpnHost = new(
            name: "proton.vpn",
            ip: "135.27.46.203",
            label: string.Empty,
            x25519PublicKey: null,
            signature: string.Empty,
            isIpv6Supported: false,
            relayIpByProtocol: null);

    [TestMethod]
    public void Enumerable_ShouldContain_ExpectedNumberOfOptions()
    {
        // Arrange
        VpnEndpoint endpoint = new(_vpnHost, VpnProtocol.OpenVpnUdp, 48965);
        OpenVpnEndpointArguments subject = new(endpoint);

        // Act
        List<string> result = subject.ToList();

        // Assert
        result.Should().HaveCount(1);
    }

    [TestMethod]
    public void Enumerable_ShouldContain_RemoteOption()
    {
        // Arrange
        VpnEndpoint endpoint = new(_vpnHost, VpnProtocol.OpenVpnUdp, 61874);
        OpenVpnEndpointArguments subject = new(endpoint);

        // Act
        List<string> result = subject.ToList();

        // Assert
        result.First().Should().StartWith($"--remote {endpoint.Server.Ip} {endpoint.Port}");
    }

    [TestMethod]
    [DataRow(VpnProtocol.OpenVpnUdp, "udp")]
    [DataRow(VpnProtocol.OpenVpnTcp, "tcp")]
    public void Enumerable_ShouldMap_VpnProtocol(VpnProtocol protocol, string expected)
    {
        // Arrange
        VpnEndpoint endpoint = new(_vpnHost, protocol, 44444);
        OpenVpnEndpointArguments subject = new(endpoint);

        // Act
        List<string> result = subject.ToList();

        // Assert
        result.Should().Contain($"--remote {endpoint.Server.Ip} {endpoint.Port} {expected}");
    }

    [TestMethod]
    [DataRow(VpnProtocol.Smart)]
    public void Enumerable_ShouldThrow_WhenProtocolIsNotSupported(VpnProtocol protocol)
    {
        // Arrange
        VpnEndpoint endpoint = new(_vpnHost, protocol, 54321);
        OpenVpnEndpointArguments subject = new(endpoint);

        // Act
        Action action = () => subject.ToList();

        // Assert
        action.Should().Throw<ArgumentException>();
    }
}