using System;
using System.Globalization;
using System.Threading;
using Owin;

namespace EnVisage
{
	public static class OwinExtensions
	{
		/// <summary>
		/// Per http://www.zpqrtbnk.net/posts/appdomains-threads-cultureinfos-and-paracetamol, a fix for SignalR init 
		/// See https://github.com/SignalR/SignalR/issues/3414 for additional details
		/// </summary>
		public static void SanitizeThreadCulture(this IAppBuilder app)
		{
			var currentCulture = CultureInfo.CurrentCulture;

			// at the top of any culture should be the invariant culture,
			// find it doing an .Equals comparison ensure that we will
			// find it and not loop endlessly
			var invariantCulture = currentCulture; 
			while (invariantCulture.Equals(CultureInfo.InvariantCulture) == false)
				invariantCulture = invariantCulture.Parent;

			if (ReferenceEquals(invariantCulture, CultureInfo.InvariantCulture))
				return;

			var thread = Thread.CurrentThread;
			thread.CurrentCulture = CultureInfo.GetCultureInfo(thread.CurrentCulture.Name);
			thread.CurrentUICulture = CultureInfo.GetCultureInfo(thread.CurrentUICulture.Name);
		}
	}
}