public static class StringExtensions
{
	private const string SINGLE_SPACE = " ";
	private const string HYPHEN = "-";
	private const string CODE_PAGE_NAME = "Cyrillic";

	private const string INVALID_CHARS_PATTERN = @"[^a-z0-9\s-]";
	private const string MULTIPLE_SPACES_PATTERN = @"\s+";
	private const string SINGLE_SPACE_PATTERN = @"\s";


	public static string ToSlug(this string phrase, int maxlength = 0)
	{
		return phrase
			.RemoveAccent()
			.ToLower()
			.RemoveInvalidChars()
			.ReduceSpaces()
			.CutAndTrim(maxlength)
			.Hyphenate();
	}

	public static string RemoveInvalidChars(this string phrase)
	{
		return Regex.Replace(phrase, INVALID_CHARS_PATTERN, string.Empty);
	}

	public static string ReduceSpaces(this string phrase)
	{
		return Regex.Replace(phrase, MULTIPLE_SPACES_PATTERN, SINGLE_SPACE).Trim();
	}

	public static string CutAndTrim(this string phrase, int maxLength = 0)
	{
		if (maxLength > 0)
			return phrase.Substring(0, phrase.Length <= maxLength ? phrase.Length : maxLength).Trim();
		else
			return phrase.Trim();
	}

	public static string Hyphenate(this string phrase)
	{
		return Regex.Replace(phrase, SINGLE_SPACE_PATTERN, HYPHEN);
	}
	public static string RemoveAccent(this string phrase)
	{
		byte[] bytes = System.Text.Encoding.GetEncoding(CODE_PAGE_NAME).GetBytes(phrase);
		return System.Text.Encoding.ASCII.GetString(bytes);
	}
}