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 RegisterQueues(this IServiceCollection services)
    {
        using var sp = services.BuildServiceProvider();
        var queueHandlerType = typeof(IQueueHandler<>);
        // 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() == queueHandlerType));
        var hostedServiceRegistrator = new HostedServiceRegistrator();
        
        // register each query type with its corresponding interface
        foreach (var queueType in queueTypes)
        {
            // get the T from IQueueHandler<T>
            var taskType = queueType.GetInterfaces()
                .Single(i => i.IsGenericType && i.GetGenericTypeDefinition() == queueHandlerType);
            
            // register the query type as a scoped service with its corresponding interface
            services.AddScoped(queueType);
            
            var typeRegistry = sp.GetRequiredService<ITypeRegistry>();
            typeRegistry.RegisterTaskType(taskType.GenericTypeArguments.First().Name, taskType);
            
            services.AddScoped(queueType);
            
            var hostedServiceType = typeof(QueueService<>).MakeGenericType(taskType.GenericTypeArguments);
            hostedServiceRegistrator.RegisterHostedService(services, hostedServiceType);
        }
        return services;
        
    }
    
    
}