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

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

public class GlobalOptionsValidationTests
{
    /// <summary>Verifies that startup rejects blank identity.</summary>
    /// <param name="key">Test case input.</param>
    [Theory]
    [InlineData("ScadaBridge:OpcUa:ApplicationName")]
    [InlineData("ScadaBridge:MxGateway:ClientNamePrefix")]
    public void StartupRejectsBlankIdentity(string key)
    {
        var services = new ServiceCollection();
        services.AddSingleton<IConfiguration>(new ConfigurationBuilder().AddInMemoryCollection(
            new Dictionary<string, string?> { [key] = " " }).Build());
        services.AddDataConnectionLayer();
        using var provider = services.BuildServiceProvider();
        var exception = Assert.Throws<OptionsValidationException>(() => provider.GetRequiredService<IStartupValidator>().Validate());
        Assert.Contains(key, exception.Message);
    }

    /// <summary>Verifies that defaults validate at startup.</summary>
    [Fact]
    public void DefaultsValidateAtStartup()
    {
        var services = new ServiceCollection();
        services.AddSingleton<IConfiguration>(new ConfigurationBuilder().Build());
        services.AddDataConnectionLayer();
        using var provider = services.BuildServiceProvider();
        provider.GetRequiredService<IStartupValidator>().Validate();
    }

    /// <summary>
    /// Review 2026-10-21 02/U1: the bound <c>ScadaBridge:MxGateway:ClientNamePrefix</c> actually
    /// reaches the MxGateway adapters the DI-built factory creates.
    /// </summary>
    [Fact]
    public void ClientNamePrefix_FlowsIntoTheMxGatewayAdapter()
    {
        var services = new ServiceCollection();
        services.AddSingleton<IConfiguration>(new ConfigurationBuilder().AddInMemoryCollection(
            new Dictionary<string, string?> { ["ScadaBridge:MxGateway:ClientNamePrefix"] = "plant7" }).Build());
        services.AddSingleton<ILoggerFactory>(NullLoggerFactory.Instance);
        services.AddDataConnectionLayer();
        using var provider = services.BuildServiceProvider();

        var adapter = provider.GetRequiredService<IDataConnectionFactory>()
            .Create("MxGateway", new Dictionary<string, string>());

        var prefix = typeof(MxGatewayDataConnection)
            .GetField("_clientNamePrefix", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic)!
            .GetValue(adapter);
        Assert.Equal("plant7", prefix);
    }
}