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

using System.Text.RegularExpressions;

namespace SeaHaven.Services.Helpers
{
    public static class WorkOrderNumberNormalizer
    {
        private const int RequiredLength = 11;

        public static bool TryNormalize(string? input, out string normalized, out string? error)
        {
            normalized = "";
            error = null;

            if (string.IsNullOrWhiteSpace(input))
            {
                error = "WO number is required.";
                return false;
            }

            var digits = Regex.Replace(input.Trim(), @"\D", "");
            if (digits.Length == 0)
            {
                error = "WO number must contain digits.";
                return false;
            }

            if (digits.Length > RequiredLength)
            {
                error = $"WO number cannot exceed {RequiredLength} digits.";
                return false;
            }

            normalized = digits.PadLeft(RequiredLength, '0');
            return true;
        }
    }
}