using System.Linq;
using gehGassi.Core.Interfaces;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;

namespace gehGassi.Web.Helper
{
    /// <summary>
    /// Attribut das die Lokalisierung einer URL durchführt.
    /// Wenn keine Sprache angegeben ist, wird die des Benutzers eingestellt
    /// </summary>
    public class LocalizeAttribute : AuthorizeAttribute, IAuthorizationFilter
    {
        public LocalizeAttribute()
        {

        }

        public void OnAuthorization(AuthorizationFilterContext context)
        {
            if (context.HttpContext.User.Identity.IsAuthenticated)
            {
                var userService = context.HttpContext.RequestServices.GetService<IUserService>();
                var locOptions = context.HttpContext.RequestServices.GetService<IOptions<RequestLocalizationOptions>>();
                var path = context.HttpContext.Request.Path.Value;
                if (path.ToLower().Contains("globalize"))
                    return;
                if (path.Length > 1)
                {
                    if (locOptions.Value.SupportedCultures.Any(valueSupportedCulture => path.Contains($"/{valueSupportedCulture.TwoLetterISOLanguageName}/")))
                    {
                        return;
                    }
                    else if (locOptions.Value.SupportedCultures.Any(valueSupportedCulture => path.EndsWith($"/{valueSupportedCulture.TwoLetterISOLanguageName}")))
                        return;
                    var user = userService.GetByUsernameAsync(context.HttpContext.User.Identity.Name).Result;
                    context.Result = new LocalRedirectResult($"/{user.PreferredLanguage}{path}");
                }
                else
                {
                    //ROOT Aufruf. Sprache des Benutzers holen und redirect
                    var user = userService.GetByUsernameAsync(context.HttpContext.User.Identity.Name).Result;
                    context.Result = new LocalRedirectResult($"/{user.PreferredLanguage}");
                }
            }
        }
    }
}