using Shouldly;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;

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

/// <summary>
///     Tests for <see cref="OpcUaClientDriverFactoryExtensions"/> — the factory that lets the
///     Server-side <c>DriverFactoryBootstrap</c> materialise a real <see cref="OpcUaClientDriver"/>
///     from a <c>DriverInstance</c> row instead of falling back to a stub.
/// </summary>
public class OpcUaClientDriverFactoryTests
{
    private const string SampleConfig =
        """{"EndpointUrl":"opc.tcp://host:4840","SecurityMode":"None","AutoAcceptCertificates":true}""";

    /// <summary>Verifies the factory builds a driver carrying the right type + instance identity.</summary>
    [Fact]
    public void CreateInstance_builds_an_OpcUaClient_driver_with_the_right_identity()
    {
        var driver = OpcUaClientDriverFactoryExtensions.CreateInstance("drv-1", SampleConfig, NullLoggerFactory.Instance);
        driver.DriverType.ShouldBe("OpcUaClient");
        driver.DriverInstanceId.ShouldBe("drv-1");
    }

    /// <summary>Verifies the public driver-type-name constant matches the driver's DriverType.</summary>
    [Fact]
    public void DriverTypeName_is_OpcUaClient()
        => OpcUaClientDriverFactoryExtensions.DriverTypeName.ShouldBe("OpcUaClient");

    /// <summary>Verifies a JSON literal that deserialises to null is rejected with a clear error.</summary>
    [Fact]
    public void CreateInstance_throws_on_null_json_deserialisation()
        => Should.Throw<System.InvalidOperationException>(
            () => OpcUaClientDriverFactoryExtensions.CreateInstance("drv-1", "null", NullLoggerFactory.Instance));
}