Convert-it/Middleware/UrlTranslationMiddleware.cs

using Convert_It_Online.Services;
using System.Globalization;
using System.Text.RegularExpressions;

namespace Convert_It_Online.Middleware
{
    public class UrlTranslationMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly IUrlTranslationService _urlTranslationService;
        private readonly ILogger<UrlTranslationMiddleware> _logger;

        public UrlTranslationMiddleware(RequestDelegate next, IUrlTranslationService urlTranslationService, ILogger<UrlTranslationMiddleware> logger)
        {
            _next = next;
            _urlTranslationService = urlTranslationService;
            _logger = logger;
        }

        public async Task InvokeAsync(HttpContext context)
        {
            var path = context.Request.Path.Value;
            
            if (!string.IsNullOrEmpty(path))
            {
                _logger.LogInformation($"Processing path: {path}");
                
                // Pattern: /{culture}/{translatedArea}/{translatedController}[/{action}]
                var match = Regex.Match(path, @"^/([a-z]{2}-[A-Z]{2})/([^/]+)/([^/]+)(?:/([^/]+))?");
                
                if (match.Success)
                {
                    var cultureName = match.Groups[1].Value;
                    var translatedArea = match.Groups[2].Value;
                    var translatedController = match.Groups[3].Value;
                    var action = match.Groups[4].Success ? match.Groups[4].Value : "Index";

                    // Skip if this is already an internal area/controller name (starts with capital letter)
                    if (char.IsUpper(translatedArea[0]) || char.IsUpper(translatedController[0]))
                    {
                        _logger.LogInformation($"Skipping internal path: {path}");
                        await _next(context);
                        return;
                    }

                    _logger.LogInformation($"Matched: culture={cultureName}, area={translatedArea}, controller={translatedController}, action={action}");

                    try
                    {
                        var culture = new CultureInfo(cultureName);
                        var originalArea = _urlTranslationService.GetOriginalArea(translatedArea, culture);
                        var originalController = _urlTranslationService.GetOriginalController(translatedController, culture);

                        _logger.LogInformation($"Translations: originalArea={originalArea}, originalController={originalController}");

                        if (originalArea != null && originalController != null)
                        {
                            // Rewrite the path to use original controller names
                            var newPath = $"/{cultureName}/{originalArea}/{originalController}";
                            if (!string.IsNullOrEmpty(action) && action != "Index")
                            {
                                newPath += $"/{action}";
                            }

                            _logger.LogInformation($"Rewriting path from {path} to {newPath}");
                            context.Request.Path = newPath;
                        }
                    }
                    catch (CultureNotFoundException)
                    {
                        _logger.LogWarning($"Culture {cultureName} not found");
                        // Continue with original path if culture is not supported
                    }
                }
            }
            
            await _next(context);
        }
    }
}