shoc-backend/SeaHaven.Services/Helpers/WorkOrderBoardSortFields.cs

namespace SeaHaven.Services.Helpers
{
    public static class WorkOrderBoardSortFields
    {
        public static readonly IReadOnlySet<string> Allowed = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
        {
            "scheduledDate",
            "woNumber",
            "dueDate"
        };

        public static string NormalizeOrThrow(string? sortBy)
        {
            var field = (sortBy ?? "scheduledDate").Trim();
            if (!Allowed.Contains(field))
            {
                throw new ArgumentException(
                    "sortBy must be one of: scheduledDate, woNumber, dueDate.");
            }

            return field.ToLowerInvariant() switch
            {
                "wonumber" => "woNumber",
                "duedate" => "dueDate",
                _ => "scheduledDate"
            };
        }
    }
}