using System;
using System.Web;
using GeneralApi.Core.Infrastructure.IoC;

namespace Taloyhtio.GeneralApi.Core.Infrastructure.Web
{
    public class DependencyRegistrarModule : IHttpModule
    {
        private static bool dependenciesRegistered;
        private static readonly object lockObject = new object();

        public void Init(HttpApplication context)
        {
            context.BeginRequest += context_BeginRequest;
        }

        public void Dispose() { }

        private static void context_BeginRequest(object sender, EventArgs e)
        {
            ensureDependenciesRegistered();
        }

        private static void ensureDependenciesRegistered()
        {
            // configuration is required only once per AppDomain
            if (!dependenciesRegistered)
            {
                lock (lockObject)
                {
                    if (!dependenciesRegistered)
                    {
                        IoCConfiguration.Configure();
                        dependenciesRegistered = true;
                    }
                }
            }
        }
    }
}