using System.Text.Json.Serialization;
using Microsoft.AspNetCore.SignalR;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using RobotNet10.NavigationTune.Data;
using RobotNet10.NavigationTune.Execution;
using RobotNet10.NavigationTune.Interfaces;
using RobotNet10.NavigationTune.Services;
using RobotNet10.NavigationTune.Shared.Interfaces;

namespace RobotNet10.NavigationTune.Extensions;

/// <summary>
/// Extension methods for service registration
/// </summary>
public static class ServiceCollectionExtensions
{
    /// <summary>
    /// Add Navigation Tuning services
    /// </summary>
    public static IServiceCollection AddNavigationTuning(
        this IServiceCollection services,
        Action<DbContextOptionsBuilder> dbContextOptions)
    {
        services.AddDbContext<TuningDbContext>(dbContextOptions);

        // Repositories
        services.AddScoped<ITestRepository, TestRepository>();
        services.AddScoped<IScenarioRepository, ScenarioRepository>();

        // Services
        services.AddScoped<IParameterManager, ParameterManager>();
        services.AddScoped<IMetricsCalculator, MetricsCalculator>();
        services.AddScoped<ITuningAdvisor, TuningAdvisor>();

        // Execution
        services.AddScoped<ITestExecutor, TestExecutor>();
        services.AddScoped<ITuningNavigation, TuningNavigation>();

        // Singleton: so Stop/EMC Stop (different HTTP request) can cancel the running test
        services.AddSingleton<IRunningTestCancellationRegistry, RunningTestCancellationRegistry>();

        // Orchestrator
        services.AddScoped<ITuningOrchestrator, TuningOrchestrator>();

        // SignalR Hub: allow NaN/Infinity in JSON so telemetry/metrics with non-finite floats do not abort the connection
        services.AddSignalR()
            .AddJsonProtocol(options =>
            {
                options.PayloadSerializerOptions.NumberHandling = JsonNumberHandling.AllowNamedFloatingPointLiterals;
            });

        return services;
    }

    /// <summary>
    /// Add Navigation Tuning with real robot dependencies
    /// </summary>
    public static IServiceCollection AddNavigationTuningWithRobot(
        this IServiceCollection services,
        Action<DbContextOptionsBuilder> dbContextOptions)
    {
        // Add base services
        services.AddNavigationTuning(dbContextOptions);

        // Note: Adapters for real robot should be registered in the application layer
        // that has access to RobotApp.Interfaces.ILocalization and IVelocityController
        // Example:
        // services.AddScoped<ILocalizationProvider>(sp =>
        // {
        //     var localization = sp.GetRequiredService<RobotNet10.RobotApp.Interfaces.ILocalization>();
        //     return new LocalizationAdapter(
        //         () => localization.X,
        //         () => localization.Y,
        //         () => localization.Theta
        //     );
        // });

        return services;
    }

    /// <summary>
    /// Map SignalR hubs
    /// Note: This should be called in the application's Program.cs or Startup.cs
    /// Example: app.MapHub<TuningHub>("/tuninghub");
    /// </summary>
}