namespace UtopiaCanteenSystem.Services;

internal static class SiteIdHelper
{
    public static int ToInt(string? siteId)
    {
        var s = (siteId ?? string.Empty).Trim();
        if (string.IsNullOrEmpty(s))
            return 0;
        var digits = new string(s.Where(char.IsDigit).ToArray());
        return int.TryParse(digits, out var n) ? n : 0;
    }

    public static string ToDisplayString(int siteIdInt)
    {
        if (siteIdInt <= 0)
            return "01";
        return siteIdInt <= 99 ? siteIdInt.ToString("D2") : siteIdInt.ToString();
    }

    public static string NormalizeSiteId(string? siteId)
    {
        var normalized = (siteId ?? string.Empty).Trim();
        if (string.IsNullOrEmpty(normalized))
            normalized = "01";
        if (normalized.Length == 1 && char.IsDigit(normalized[0]))
            normalized = normalized.PadLeft(2, '0');
        return normalized;
    }
}