using System.Globalization;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.Net.Http.Headers;

namespace gehGassi.Web.Helper
{
    /// <summary>
    /// Hilfsklasse für das Lokalisieren der URLs für Login, Logout und Zugriff verweigert
    /// </summary>
    public class LocalizedCookieAuthenticationEvents : CookieAuthenticationEvents
    {
        /// <summary>
        /// Implements the interface method by invoking the related delegate method.
        /// </summary>
        /// <param name="context">Contains information about the event</param>
        public override Task RedirectToLogin(RedirectContext<CookieAuthenticationOptions> context)
        {
            if (context.HttpContext.Request.IsAjaxRequest())
            {
                context.Response.StatusCode = 451;
                context.Response.Headers[HeaderNames.Location] = context.RedirectUri;
                return Task.FromResult(0);
            }

            context.RedirectUri = $"/{CultureInfo.CurrentCulture.TwoLetterISOLanguageName}/account/login";
            return base.RedirectToLogin(context);
        }

        /// <summary>
        /// Implements the interface method by invoking the related delegate method.
        /// </summary>
        /// <param name="context">Contains information about the event</param>
        public override Task RedirectToAccessDenied(RedirectContext<CookieAuthenticationOptions> context)
        {
            if (context.HttpContext.Request.IsAjaxRequest())
            {
                var statusCode = 401;
                if (context.Response.Headers.ContainsKey("StatusToSet"))
                {
                    statusCode = int.Parse(context.Response.Headers["StatusToSet"]);
                    context.Response.Headers.Remove("StatusToSet");
                }
                context.Response.StatusCode = statusCode;
                return Task.FromResult(0);
            }

            if (context.Response.Headers.ContainsKey("StatusToSet"))
            {
                var statusCode = int.Parse(context.Response.Headers["StatusToSet"]);
                context.Response.Headers.Remove("StatusToSet");
                if (statusCode == 402)
                {
                    context.RedirectUri = $"/{CultureInfo.CurrentCulture.TwoLetterISOLanguageName}/account/subscriptiondenied";
                    return base.RedirectToLogin(context);
                }
            }

            context.RedirectUri = $"/{CultureInfo.CurrentCulture.TwoLetterISOLanguageName}/account/accessdenied";
            return base.RedirectToLogin(context);
        }

        /// <summary>
        /// Implements the interface method by invoking the related delegate method.
        /// </summary>
        /// <param name="context">Contains information about the event</param>
        public override Task RedirectToLogout(RedirectContext<CookieAuthenticationOptions> context)
        {
            context.RedirectUri = $"/{CultureInfo.CurrentCulture.TwoLetterISOLanguageName}/account/accessdenied";
            return base.RedirectToLogin(context);
        }
    }
}