using System.Text;
using System.Text.RegularExpressions;

namespace SimpleWiki.Services;

public static class SlugHelper
{
    public static string Generate(string title)
    {
        if (string.IsNullOrWhiteSpace(title))
        {
            return string.Empty;
        }

        var normalized = title.Trim().ToLowerInvariant();
        normalized = normalized.Replace('ё', 'е');

        var sb = new StringBuilder();
        foreach (var ch in normalized)
        {
            if (char.IsLetterOrDigit(ch))
            {
                sb.Append(ch);
            }
            else if (char.IsWhiteSpace(ch) || ch == '-' || ch == '_')
            {
                sb.Append('-');
            }
        }

        var slug = Regex.Replace(sb.ToString(), "-+", "-").Trim('-');
        return string.IsNullOrWhiteSpace(slug) ? $"article-{DateTime.UtcNow:yyyyMMddHHmmss}" : slug;
    }
}