using System.Reflection;
using InServiceQue.Core.Models;
using InServiceQue.Core.Repositories;
using InServiceQue.InMemory;
using InServiceQue.Services;
using Microsoft.Extensions.DependencyInjection.Extensions;

namespace InServiceQue.Sample;

public static class DIExtensions
{
    public static IServiceCollection RegisterInternals(this IServiceCollection services)
    {
        services.AddSingleton<ITypeRegistry, QueueTypeRegistry>();
        services.AddTransient<ITaskRepository, TaskRepositoryInMemory>();
        return services;
    }
    
    public static IServiceCollection RegisterQueues(this IServiceCollection services)
    {
        using var sp = services.BuildServiceProvider();
        // find all types in the assembly that implement IQueueHandler<T>
        var queueTypes = Assembly.GetExecutingAssembly().GetTypes()
            .Where(t => t.IsClass && !t.IsAbstract && t.GetInterfaces()
                .Any(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IQueueHandler<>)));
        var hostedServiceRegistrator = new HostedServiceRegistrator();
        
        // register each query type with its corresponding interface
        foreach (var queueType in queueTypes)
        {
            // get the T from IQueueHandler<T>
            var type = queueType.GetInterfaces()
                .Single(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IQueueHandler<>));
            
            // register the query type as a scoped service with its corresponding interface
            services.AddScoped(queueType);
            
            var typeRegistry = sp.GetRequiredService<ITypeRegistry>();
            typeRegistry.RegisterTaskType(type.GenericTypeArguments.First().Name, type);
            
            services.AddScoped(typeof(IQueueHandler<>)
                .MakeGenericType(type.GenericTypeArguments), queueType);
            
            //todo: bug here
            var hostedServiceType = typeof(QueueService<>).MakeGenericType(type.GenericTypeArguments);
            hostedServiceRegistrator.RegisterHostedService(services, hostedServiceType);

            // services.AddSingleton(typeof(IQueueService<>)
            //     .MakeGenericType(type.GenericTypeArguments), );
        }
        return services;
        
    }
    
    
}