1 files changed, 35 insertions, 0 deletions
diff --git a/src/Enmarcha.Backend/Helpers/SortingHelper.cs b/src/Enmarcha.Backend/Helpers/SortingHelper.cs
new file mode 100644
index 0000000..c70dab2
--- /dev/null
+++ b/src/Enmarcha.Backend/Helpers/SortingHelper.cs
@@ -0,0 +1,35 @@
+namespace Enmarcha.Backend.Helpers;
+
+public class SortingHelper
+{
+    public static int SortRouteShortNames(string? a, string? b)
+    {
+        if (a == null && b == null) return 0;
+        if (a == null) return 1;
+        if (b == null) return -1;
+
+        var aDigits = new string(a.Where(char.IsDigit).ToArray());
+        var bDigits = new string(b.Where(char.IsDigit).ToArray());
+
+        bool aHasDigits = int.TryParse(aDigits, out int aNumber);
+        bool bHasDigits = int.TryParse(bDigits, out int bNumber);
+
+        if (aHasDigits != bHasDigits)
+        {
+            // Non-numeric routes (like "A" or "-") go to the beginning
+            return aHasDigits ? 1 : -1;
+        }
+
+        if (aHasDigits && bHasDigits)
+        {
+            if (aNumber != bNumber)
+            {
+                return aNumber.CompareTo(bNumber);
+            }
+        }
+
+        // If both are non-numeric, or numeric parts are equal, use alphabetical
+        return string.Compare(a, b, StringComparison.OrdinalIgnoreCase);
+    }
+
+}