using SQLInsight.Core.Servers;
using SQLInsight.Servers;

namespace SQLInsight.Servers.Tests;

/// <summary>
/// The CIM implementation against this computer (a local CIM session, as for the agent's own server). Remote access over
/// WS-Man/DCOM with least privilege cannot be tested here; it needs a domain with a second server.
/// </summary>
[Trait("Category", "Windows")]
[System.Runtime.Versioning.SupportedOSPlatform("windows")]
public class LocalCimTests
{
    private static async Task<IWindowsServerSession?> ConnectAsync()
    {
        if (!OperatingSystem.IsWindows())
        {
            return null;
        }

        // Generous: the whole test suite (with SQL Server containers) may run at the same time.
        return await new CimWindowsServerSource(new ServerConnectionOptions { OperationTimeout = TimeSpan.FromMinutes(2) }).ConnectAsync(Environment.MachineName, CancellationToken.None);
    }

    [Fact]
    public async Task Reads_os_performance_disks_services_events_and_tasks()
    {
        using var session = await ConnectAsync();
        if (session is null)
        {
            return;
        }

        var os = await session.GetOperatingSystemAsync(CancellationToken.None);
        var first = await session.GetPerformanceAsync(DateTimeOffset.UtcNow, CancellationToken.None);
        await Task.Delay(1500);
        var second = await session.GetPerformanceAsync(DateTimeOffset.UtcNow, CancellationToken.None);
        var sample = ServerPerformanceMath.Sample(first, second, os);
        var disks = await session.GetDisksAsync(CancellationToken.None);
        var services = await session.GetServicesAsync(CancellationToken.None);
        var service = await session.GetServiceAsync(services[0].Name, CancellationToken.None);
        var events = await session.GetEventsAsync(DateTimeOffset.UtcNow.AddDays(-1), 200, CancellationToken.None);
        var tasks = await session.GetTasksAsync(name => !TaskResults.IsMicrosoftTask(name), 3, CancellationToken.None);

        Assert.Equal("lokal", session.Protocol);
        Assert.Contains("Windows", os.Caption, StringComparison.OrdinalIgnoreCase);
        Assert.True(os.LastBootUpTime < DateTimeOffset.UtcNow);
        Assert.True(os.TotalMemoryMb > 0);
        Assert.True(os.LogicalProcessors > 0);
        Assert.InRange(sample.CpuPercent!.Value, 0, 100);
        Assert.True(sample.AvailableMb > 0);
        Assert.InRange(sample.CommitPercent!.Value, 0, 100);
        Assert.NotEmpty(disks);
        Assert.All(disks, d => Assert.False(d.Volume.StartsWith(@"\\?\", StringComparison.Ordinal)));
        Assert.All(disks, d => Assert.InRange(d.FreeGb, 0, d.SizeGb));
        Assert.Contains(services, s => s.IsRunning && s.IsAutomatic);
        Assert.Equal(services[0].Name, service!.Name);
        Assert.Null(await session.GetServiceAsync("SQLInsight-findes-ikke", CancellationToken.None));
        Assert.Equal("Event Log (RPC)", events.Method);
        Assert.All(events.Entries, e => Assert.InRange(e.Level, 1, 2));
        Assert.True(tasks.Visible > 0);
        Assert.All(tasks.Watched, t => Assert.False(TaskResults.IsMicrosoftTask(t.FullName)));
    }

    [Fact]
    public async Task The_test_reports_every_area()
    {
        if (!OperatingSystem.IsWindows())
        {
            return;
        }

        var result = await WindowsServerTester.TestAsync(new CimWindowsServerSource(new ServerConnectionOptions()), "localhost", "test", DateTimeOffset.UtcNow, CancellationToken.None);

        Assert.True(result.Reachable, result.Error);
        Assert.Equal(ServerArea.All, result.Areas.Select(a => a.Area));
        Assert.All(result.Areas, a => Assert.True(a.Ok, a.Detail));
    }

    [Fact]
    public async Task An_unknown_host_is_unreachable_with_a_reason()
    {
        if (!OperatingSystem.IsWindows())
        {
            return;
        }

        var source = new CimWindowsServerSource(new ServerConnectionOptions { OperationTimeout = TimeSpan.FromSeconds(5) });
        var error = await Assert.ThrowsAsync<ServerAccessException>(() => source.ConnectAsync("sqlinsight-findes-ikke.invalid", CancellationToken.None));

        Assert.True(error.Problem is ServerAccessProblem.Unreachable or ServerAccessProblem.Timeout, error.Message);
        Assert.Contains("sqlinsight-findes-ikke.invalid", error.Message, StringComparison.Ordinal);
    }
}