using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.Tests;

/// <summary>
///     #630 (same pattern) — <c>InitializeAsync</c> on a live driver overwrote <c>_devices[host]</c> and
///     orphaned the previous state's probe loop + handles. It now releases them first.
/// </summary>
[Trait("Category", "Unit")]
public sealed class AbCipReinitializeReleasesStateTests
{
    /// <summary>Initialize twice: the first state's probe loop has stopped and its probe handle is disposed.</summary>
    [Fact]
    public async Task SecondInitialize_StopsFirstStatesLoop_AndDisposesItsHandles()
    {
        const string host = "ab://10.0.0.5/1,0";
        var factory = new FakeAbCipTagFactory();
        var drv = new AbCipDriver(new AbCipDriverOptions
        {
            Devices = [new AbCipDeviceOptions(host)],
            Probe = new AbCipProbeOptions
            {
                Enabled = true,
                Interval = TimeSpan.FromMilliseconds(20),
                Timeout = TimeSpan.FromMilliseconds(200),
                ProbeTagPath = "@raw_cpu_type",
            },
        }, "drv-reinit", factory);
        await drv.InitializeAsync("{}", CancellationToken.None);

        var first = drv.GetDeviceState(host)!;
        // Positive control: the first probe loop is running and has initialised its runtime.
        var deadline = DateTime.UtcNow.AddSeconds(5);
        while (!(factory.Tags.TryGetValue("@raw_cpu_type", out var t) && t.InitializeCount > 0))
        {
            if (DateTime.UtcNow > deadline) throw new TimeoutException("probe never started");
            await Task.Delay(10);
        }
        var firstTag = factory.Tags["@raw_cpu_type"];
        var firstLoop = first.ProbeTask;
        firstLoop.ShouldNotBeNull();
        firstLoop!.IsCompleted.ShouldBeFalse();
        firstTag.Disposed.ShouldBeFalse();

        await drv.InitializeAsync("{}", CancellationToken.None);

        firstLoop.IsCompleted.ShouldBeTrue(); // joined
        firstTag.Disposed.ShouldBeTrue();
        drv.GetDeviceState(host).ShouldNotBeSameAs(first);

        await drv.ShutdownAsync(CancellationToken.None);
    }
}