Convert-it/Routing/LocalizedControllerRouteConstraint.cs

using Convert_It_Online.Services;
using Microsoft.AspNetCore.Routing;
using System.Globalization;

namespace Convert_It_Online.Routing
{
    public class LocalizedControllerRouteConstraint : IRouteConstraint
    {
        private readonly IUrlTranslationService _urlTranslationService;

        public LocalizedControllerRouteConstraint(IUrlTranslationService urlTranslationService)
        {
            _urlTranslationService = urlTranslationService;
        }

        public bool Match(HttpContext? httpContext, IRouter? route, string routeKey, 
            RouteValueDictionary values, RouteDirection routeDirection)
        {
            if (values.TryGetValue("translatedController", out var value) && value is string controllerName)
            {
                if (values.TryGetValue("culture", out var cultureValue) && cultureValue is string cultureName)
                {
                    var culture = new CultureInfo(cultureName);
                    var originalController = _urlTranslationService.GetOriginalController(controllerName, culture);
                    
                    if (originalController != null)
                    {
                        values["controller"] = originalController;
                        return true;
                    }
                }
            }
            
            return false;
        }
    }
}