using Flyshot.Runtime.Common;
using Flyshot.Runtime.Fanuc;
using Flyshot.Runtime.Fanuc.Protocol;
using Microsoft.Extensions.DependencyInjection;
using System.Reflection;

namespace Flyshot.Core.Tests;

/// <summary>
/// 验证 FANUC 运行时通过依赖注入解析时，能够稳定拿到日志依赖。
/// </summary>
public sealed class FanucControllerRuntimeLoggingRegistrationTests
{
    /// <summary>
    /// 验证宿主按 IControllerRuntime 解析 FANUC 运行时时，不会因为可选日志参数而退回到无日志实例。
    /// </summary>
    [Fact]
    public void ServiceProvider_Resolves_FanucControllerRuntime_WithAllClientLoggers()
    {
        var services = new ServiceCollection();
        services.AddLogging();
        services.AddSingleton<IControllerRuntime, FanucControllerRuntime>();

        using var serviceProvider = services.BuildServiceProvider();

        var runtime = serviceProvider.GetRequiredService<IControllerRuntime>();
        var concreteRuntime = Assert.IsType<FanucControllerRuntime>(runtime);
        var loggerField = typeof(FanucControllerRuntime).GetField("_logger", BindingFlags.Instance | BindingFlags.NonPublic);

        Assert.NotNull(loggerField);
        Assert.NotNull(loggerField!.GetValue(concreteRuntime));

        AssertClientLoggerIsInjected<FanucCommandClient>(concreteRuntime, "_commandClient");
        AssertClientLoggerIsInjected<FanucStateClient>(concreteRuntime, "_stateClient");
        AssertClientLoggerIsInjected<FanucJ519Client>(concreteRuntime, "_j519Client");
    }

    /// <summary>
    /// 断言运行时持有的底层协议客户端已注入对应类型的日志记录器。
    /// </summary>
    /// <typeparam name="TClient">待检查的协议客户端类型。</typeparam>
    /// <param name="runtime">已经通过依赖注入解析出的 FANUC 运行时。</param>
    /// <param name="clientFieldName">运行时内部保存该客户端实例的字段名。</param>
    private static void AssertClientLoggerIsInjected<TClient>(FanucControllerRuntime runtime, string clientFieldName)
    {
        var clientField = typeof(FanucControllerRuntime).GetField(clientFieldName, BindingFlags.Instance | BindingFlags.NonPublic);

        Assert.NotNull(clientField);
        var client = Assert.IsType<TClient>(clientField!.GetValue(runtime));
        var loggerField = typeof(TClient).GetField("_logger", BindingFlags.Instance | BindingFlags.NonPublic);

        Assert.NotNull(loggerField);
        Assert.NotNull(loggerField!.GetValue(client));
    }
}