using System.Globalization;
 
namespace Controls.Core.Design
{
	internal static class DesignTypeConverterHelper
	{
		/// <summary>
		/// Returns count of numbers in the string. Returns null if some of the values are invalid or total count exceeds max count.
		/// </summary>
		public static int? TryParseNumbers(string numberCollection, char separator, int maxCount)
		{
			// Examples: "1,2" or "1 2 3 4". 
			if (string.IsNullOrEmpty(numberCollection))
				return null;
 
			string[] parts = numberCollection.Split(separator);
			if (parts.Length > maxCount)
				return null; // too many numbers
 
			foreach (string part in parts)
			{
				if (!double.TryParse(part, NumberStyles.Number, CultureInfo.InvariantCulture, out _))
					return null; // invalid number found
			}
			return parts.Length; // all numbers are valid
		}
	}
}