using System;
using System.Web;
using GeneralApi.Core.Common;
using GeneralApi.Core.Infrastructure;
using GeneralApi.Core.Services;
using Microsoft.Practices.ServiceLocation;

namespace Taloyhtio.GeneralApi.Core.Infrastructure.Web
{
    public class UnitOfWorkModule : IHttpModule
    {
        private ILogger logger = new Logger();

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

        public void Dispose()
        {

        }

        private void context_BeginRequest(object sender, EventArgs e)
        {
            if (!shouldCreateUnitOfWork())
            {
                return;
            }

            var instance = ServiceLocator.Current.GetInstance<IUnitOfWork>();
            instance.Begin();
        }

        private void context_EndRequest(object sender, EventArgs e)
        {
            if (!shouldCreateUnitOfWork())
            {
                return;
            }

            var instance = ServiceLocator.Current.GetInstance<IUnitOfWork>();
            try
            {
                instance.Commit();
            }
            finally
            {
                instance.Dispose();
            }
        }

        private bool shouldCreateUnitOfWork()
        {
            try
            {
                string url = HttpContext.Current.Request.RawUrl;
                if (string.IsNullOrEmpty(url))
                {
                    return false;
                }
                url = url.ToLower();
                // current run only for aspx and asmx
                return (url.Contains(".aspx") || url.Contains(".asmx") || url.Contains(".svc") || url.Contains(".ashx"));
            }
            catch (Exception x)
            {
                this.logger.LogError(string.Format("{0}\n{1}", x.Message, x.StackTrace));
                return false;
            }
        }
    }
}