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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);
}
}
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