using Microsoft.Extensions.Logging.Abstractions;
using ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;

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

/// <summary>
/// Tests for protocol extensibility via DataConnectionFactory.
/// </summary>
public class DataConnectionFactoryTests
{
    /// <summary>Verifies that creating an OPC UA connection returns the OPC UA adapter.</summary>
    [Fact]
    public void Create_OpcUa_ReturnsOpcUaAdapter()
    {
        var factory = new DataConnectionFactory(NullLoggerFactory.Instance);

        var connection = factory.Create("OpcUa", new Dictionary<string, string>());

        Assert.IsType<OpcUaDataConnection>(connection);
    }

    /// <summary>Verifies that creating an MxGateway connection returns the MxGateway adapter.</summary>
    [Fact]
    public void Create_MxGateway_ReturnsMxGatewayAdapter()
    {
        var factory = new DataConnectionFactory(NullLoggerFactory.Instance);

        var connection = factory.Create("MxGateway", new Dictionary<string, string>());

        Assert.IsType<MxGatewayDataConnection>(connection);
    }

    /// <summary>Verifies that protocol names are matched case-insensitively.</summary>
    [Fact]
    public void Create_CaseInsensitive()
    {
        var factory = new DataConnectionFactory(NullLoggerFactory.Instance);

        var connection = factory.Create("opcua", new Dictionary<string, string>());

        Assert.IsType<OpcUaDataConnection>(connection);
    }

    /// <summary>Verifies that an unknown protocol throws an exception.</summary>
    [Fact]
    public void Create_UnknownProtocol_Throws()
    {
        var factory = new DataConnectionFactory(NullLoggerFactory.Instance);

        var ex = Assert.Throws<ArgumentException>(() =>
            factory.Create("UnknownProtocol", new Dictionary<string, string>()));

        Assert.Contains("Unknown protocol type", ex.Message);
        Assert.Contains("OpcUa", ex.Message);
    }

    /// <summary>Verifies that a registered adapter extends the set of protocols the factory can create.</summary>
    [Fact]
    public void RegisterAdapter_ExtendsFactory()
    {
        var factory = new DataConnectionFactory(NullLoggerFactory.Instance);

        // Adding a new protocol = register an adapter
        factory.RegisterAdapter("Custom", _ => new OpcUaDataConnection(
            new DefaultOpcUaClientFactory(), NullLogger<OpcUaDataConnection>.Instance));

        var connection = factory.Create("Custom", new Dictionary<string, string>());
        Assert.NotNull(connection);
    }
}