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

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

/// <summary>
///     CONV-4 — <see cref="AbLegacyDriver.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 AbLegacyResolveHostTests
{
    private const string DeviceA = "ab://10.0.0.5/1,0";
    private const string DeviceB = "ab://10.0.0.6/1,0";

    private static AbLegacyDriver NewDriver() => new(
        new AbLegacyDriverOptions
        {
            Devices = [new AbLegacyDeviceOptions(DeviceA), new AbLegacyDeviceOptions(DeviceB)],
            Probe = new AbLegacyProbeOptions { Enabled = false },
        },
        "ablegacy-1", new FakeAbLegacyTagFactory());

    /// <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}}","address":"N7:0","dataType":"Int"}""";
        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);
    }
}