using System;
using System.Threading;
namespace ln.application
{
	public class ApplicationContext
	{
		static ThreadLocal<ApplicationContext> currentApplicationContext = new ThreadLocal<ApplicationContext>();
		public static void SetCurrentContext(ApplicationContext applicationContext) => currentApplicationContext.Value = applicationContext;
		public static void ClearCurrentContext() => currentApplicationContext.Value = null;

		public Guid ContextID { get; }
		public DateTime Created { get; }
		public DateTime LastAccess { get; protected set; }

		public TimeSpan Age => LastAccess - Created;
		public TimeSpan Untouched => DateTime.Now - LastAccess;

		public Application Application { get; }
		public AuthenticatedUser CurrentUser { get; protected set; }


		public ApplicationContext(Application application)
		{
			ContextID = Guid.NewGuid();
			Created = DateTime.Now;
			LastAccess = Created;

			Application = application;
			CurrentUser = AuthenticatedUser.Anonymous;
		}

		protected void UpdateLastAccess()
		{
			LastAccess = DateTime.Now;
		}

		public virtual bool AuthenticateUser(string username,object prove)
		{
			AuthenticatedUser authenticatedUser = Application.AuthenticateUser(username, prove);
			if (authenticatedUser != null)
			{
				CurrentUser = authenticatedUser;
				return true;
			}
			else
			{
				CurrentUser = AuthenticatedUser.Anonymous;
				return false;
			}
		}
		public virtual void DeauthenticateUser()
		{
			CurrentUser = AuthenticatedUser.Anonymous;
		}
	}
}