using ManagerService.Data;
using System.Linq;
using System.Text.RegularExpressions;

namespace ManagerService.Helpers
{
    public static class SlugHelper
    {
        /// <summary>
        /// Generate a URL-safe slug from a name, appending "-1", "-2", etc. until unique among Instances.WebSlug.
        /// </summary>
        public static string GenerateUniqueSlug(MyInfoMateDbContext db, string name)
        {
            var slug = name.ToLowerInvariant();
            slug = Regex.Replace(slug, @"[àáâãäå]", "a");
            slug = Regex.Replace(slug, @"[èéêë]", "e");
            slug = Regex.Replace(slug, @"[ìíîï]", "i");
            slug = Regex.Replace(slug, @"[òóôõö]", "o");
            slug = Regex.Replace(slug, @"[ùúûü]", "u");
            slug = Regex.Replace(slug, @"[ç]", "c");
            slug = Regex.Replace(slug, @"[ñ]", "n");
            slug = Regex.Replace(slug, @"[^a-z0-9\s-]", "");
            slug = Regex.Replace(slug, @"[\s-]+", "-").Trim('-');

            var baseSlug = slug;
            var counter = 1;
            while (db.Instances.Any(i => i.WebSlug == slug))
                slug = $"{baseSlug}-{counter++}";

            return slug;
        }
    }
}