Added order item updating

Controllers/OrderController.cs

@@ -146,6 +146,34 @@ public class OrderController : Controller
         return RedirectToAction("Details", new { code = orderItem.Order?.OrderCode });
     }
 
+    // POST: Order/UpdateItem
+    [HttpPost]
+    public async Task<IActionResult> UpdateItem(int orderItemId, int quantity, string comments)
+    {
+        var orderItem = await _context.OrderItems
+            .Include(oi => oi.Order)
+            .Include(oi => oi.MenuItem)
+            .FirstOrDefaultAsync(oi => oi.Id == orderItemId);
+            
+        if (orderItem == null)
+            return NotFound("Order item not found");
+
+        if (orderItem.Order?.IsClosed == true)
+            return BadRequest("Cannot update items in a closed order");
+
+        if (orderItem.ParticipantEmail != User.Identity?.Name)
+            return Forbid("Only the participant who added this item can update it");
+
+        orderItem.Quantity = quantity;
+        orderItem.Comments = comments;
+        
+        _context.OrderItems.Update(orderItem);
+        await _context.SaveChangesAsync();
+
+        return RedirectToAction("Details", new { code = orderItem.Order?.OrderCode });
+    }
+
+
     // GET: Order/Details/{code}
     public async Task<IActionResult> Details(string code)
     {