using System;
using System.Linq;
using System.Net;
using System.Web.Mvc;
using Kreta.Enums.ManualEnums;
using Kreta.Framework;
using Kreta.Web.Areas.Adminisztracio.Controllers;
using Kreta.Web.Classes;
using Kreta.Web.Configuration;
using Kreta.Web.Controllers;
using Kreta.Web.Controllers.Logic;

namespace Kreta.Web.Security
{
    public class MvcSessionAuthorizeAttribute : AuthorizeAttribute
    {
        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            if (SkipExistsOrganization(filterContext))
            {
                return;
            }

            if (SkipAuthorization(filterContext))
            {
                return;
            }

            if (AuthorizeSessionVariables())
            {
                if (filterContext.Controller is LayoutController && filterContext.ActionDescriptor.ActionName.Equals("GetRemainingTime"))
                    return;
                SessionHandler.UpdateSessionTime();
            }
            else
            {
                if (!filterContext.HttpContext.Request.IsAjaxRequest())
                {
                    if (filterContext.HttpContext.Request.Headers.AllKeys.Contains(Enums.ManualEnums.KliensTipusEnum.Mobile.ToString()))
                    {
                        filterContext.Result = new HttpStatusCodeResult((int)CustomHTTPStatusEnum.NincsBelepve);
                    }
                    else
                    {
                        var url = new UrlHelper(filterContext.RequestContext);
                        var idpConfiguration = DependencyResolver.Current.GetService<IIdpConfiguration>();
                        if (idpConfiguration.LoginEnabled)
                        {
                            MasterLayoutLogic.LogOut();
                            filterContext.Result = new RedirectResult(url.Action("Index", "Home", new { area = string.Empty }));
                        }
                        else
                        {
                            filterContext.Result = new RedirectResult(url.Action("Index", "Login", new { area = "Adminisztracio" }));
                        }
                    }
                }
                else
                {
                    filterContext.Result = new HttpStatusCodeResult(HttpStatusCode.Unauthorized);
                    filterContext.HttpContext.Response.SuppressFormsAuthenticationRedirect = true;
                }
            }
        }

        private bool AuthorizeSessionVariables()
        {
            if (!ClaimData.IsAuthenticated)
                return false;
            if (!SDAServer.Instance.SessionManager.IsSessionAlive(ClaimData.SessionId))
                return false;
            return true;
        }

        private bool SkipAuthorization(AuthorizationContext filterContext)
        {
            var idpConfiguration = DependencyResolver.Current.GetService<IIdpConfiguration>();
            if (idpConfiguration.LoginEnabled)
            {
                if (filterContext.Controller is HomeController && filterContext.ActionDescriptor.ActionName.Equals("Index"))
                {
                    if (ClaimData.IsAuthenticated && !SDAServer.Instance.SessionManager.IsSessionAlive(ClaimData.SessionId))
                        return false;
                    return true;
                }
            }
            else
            {
                if (filterContext.Controller is LoginController && filterContext.ActionDescriptor.ActionName.Equals("Index"))
                    return true;
            }

            return (IsAllowAnonymous(filterContext) || IsMvcSiteMapCalls(filterContext));
        }

        private static bool IsAllowAnonymous(AuthorizationContext filterContext)
        {
            bool result = filterContext.ActionDescriptor.IsDefined(typeof(AllowAnonymousAttribute), inherit: true)
                          || filterContext.ActionDescriptor.ControllerDescriptor.IsDefined(typeof(AllowAnonymousAttribute), inherit: true);

            return result;
        }

        private static bool IsMvcSiteMapCalls(AuthorizationContext filterContext)
        {
            return filterContext.HttpContext.Request is MvcSiteMapProvider.Web.Mvc.SiteMapHttpRequest;
        }

        /// <summary>
        /// Megvizsgáljuk, hogy létezik-e az URL-ben megadott intézmény azonosító. Ha nem, akkor hiba!
        /// A bejelentkezési oldalra sem szabad irányítani.
        /// </summary>
        /// <param name="filterContext"></param>
        /// <returns></returns>
        static bool SkipExistsOrganization(AuthorizationContext filterContext)
        {
            bool letezoIntezmeny = KretaServer.KretaServer.Instance.GetOsszesIntezmeny().Contains(LoginManager.OrganizationIdentifier, StringComparer.InvariantCultureIgnoreCase);
            if (letezoIntezmeny == false && filterContext.RequestContext.RouteData.Values["controller"].ToString() != "HibaOldal")
            {
                throw new InvalidConfigurationException($"Az intézmény nem létezik: {LoginManager.OrganizationIdentifier}");
            }

            return false;
        }
    }
}