using System.Reflection;
using Opc.Ua;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Alarms;
using ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;

namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests.Adapters;

public class RealOpcUaSnapshotScopeTests
{
    [Fact]
    public void RefreshBoundaries_PreserveSourceAndHaveDistinctEpochs()
    {
        var client = new RealOpcUaClient();
        var events = new List<NativeAlarmTransition>();
        var handler = typeof(RealOpcUaClient).GetMethod("HandleAlarmEvent", BindingFlags.Instance | BindingFlags.NonPublic)!;
        void Emit(string handle, string source, NodeId type) => handler.Invoke(client,
            [handle, source, new EventFieldList { EventFields = new VariantCollection { new(type), new(), new(), new(), new(), new() } }, (Action<NativeAlarmTransition>)events.Add]);
        Emit("a", "A", ObjectTypeIds.RefreshStartEventType);
        Emit("b", "B", ObjectTypeIds.RefreshStartEventType);
        Emit("a", "A", ObjectTypeIds.RefreshEndEventType);
        Emit("b", "B", ObjectTypeIds.RefreshEndEventType);
        Assert.Equal(4, events.Count);
        Assert.Equal(["SnapshotStart", "SnapshotStart", "SnapshotComplete", "SnapshotComplete"], events.Select(e => e.Kind.ToString()));
        Assert.Equal(["A", "B", "A", "B"], events.Select(e => e.SourceObjectReference));
        var epoch = typeof(NativeAlarmTransition).GetProperty("SnapshotId")!;
        Assert.NotNull(epoch);
        Assert.NotNull(epoch.GetValue(events[0]));
        Assert.Equal(epoch.GetValue(events[0]), epoch.GetValue(events[2]));
        Assert.Equal(epoch.GetValue(events[1]), epoch.GetValue(events[3]));
        Assert.NotEqual(epoch.GetValue(events[0]), epoch.GetValue(events[1]));
    }
}