using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.TwinCAT;

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

/// <summary>
///     CONV-4 — <see cref="TwinCATDriver.ResolveHost"/> must resolve an equipment-tag reference
///     (raw TagConfig JSON) to its OWN device host so per-host breaker keys are correct for
///     equipment tags, not the first-device fallback.
/// </summary>
[Trait("Category", "Unit")]
public sealed class TwinCATResolveHostTests
{
    private const string DeviceA = "ads://5.23.91.23.1.1:851";
    private const string DeviceB = "ads://5.23.91.23.1.2:851";

    private static TwinCATDriver NewDriver() => new(
        new TwinCATDriverOptions
        {
            Devices = [new TwinCATDeviceOptions(DeviceA), new TwinCATDeviceOptions(DeviceB)],
            Probe = new TwinCATProbeOptions { Enabled = false },
            EnableControllerBrowse = false,
        },
        "twincat-1", new FakeTwinCATClientFactory());

    /// <summary>An equipment-tag ref naming device B resolves to device B's host, not the first device.</summary>
    [Fact]
    public void ResolveHost_EquipmentTagRef_ReturnsItsOwnDeviceHost()
    {
        var drv = NewDriver();
        var json = $$"""{"deviceHostAddress":"{{DeviceB}}","symbolPath":"MAIN.Speed","dataType":"DInt"}""";
        drv.ResolveHost(json).ShouldBe(DeviceB);
    }

    /// <summary>An unresolvable ref keeps the current first-device fallback.</summary>
    [Fact]
    public void ResolveHost_UnknownRef_KeepsCurrentFallback()
    {
        var drv = NewDriver();
        drv.ResolveHost("totally-unknown").ShouldBe(DeviceA);
    }
}