using Xunit;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>
/// TRAX load-path guarding (2026-10-04). Startup used to freeze for ~40s when the
/// music track lived on an offline network share: <c>LoadLayout</c> called
/// <c>MusicPlayer.Load</c> synchronously, and <c>new MediaFoundationReader(path)</c>
/// does not fail fast on a dead SMB session — it burns the full timeout and then
/// throws 0x80070035. The fix is a bounded reachability probe on a background thread,
/// so an unreachable share can never sit on the path the creator waits on.
/// </summary>
public class TraxProbeTests
{
    /// <summary>The regression this guards: a probe that hangs must be abandoned at the
    /// budget and reported offline. Without the ceiling the caller inherits the SMB
    /// timeout, which is the 40-second frozen startup window. The orphaned probe thread
    /// is released at the end so the test does not leak it.</summary>
    [Fact]
    public async Task AHangingProbeIsAbandonedAtTheBudget_AndReportsOffline()
    {
        var orphan = new ManualResetEventSlim(false);
        var started = DateTime.UtcNow;

        try
        {
            var reachable = await MainViewModel.IsTrackReachableAsync(
                @"\\llamavault\llamaVault\Assets\Music\VBI - Mayhem OST.mp3",
                TimeSpan.FromMilliseconds(150),
                // Stands in for a share that has gone away: the open never completes.
                _ =>
                {
                    orphan.Wait(TimeSpan.FromSeconds(30));
                    return true;
                });

            var elapsed = DateTime.UtcNow - started;

            Assert.False(reachable);
            Assert.True(
                elapsed < TimeSpan.FromSeconds(5),
                $"probe was not cut off at the budget — took {elapsed.TotalSeconds:0.0}s, which is the frozen-startup bug returning");
        }
        finally
        {
            orphan.Set();
        }
    }
}