namespace Fitness_core_BE.AI
{
    public class ModificationGuard
    {
        private static readonly string[] AllowedKeywords =
    {
        "replace",
        "remove",
        "allergy",
        "change",
        "vegetarian",
        "calorie",
        "protein",
        "carb",
        "fat",
        "meal",
        "ingredient"
    };

        private static readonly string[] BlockedPatterns =
        {
        "ignore previous instructions",
        "system prompt",
        "act as",
        "bypass",
        "developer mode",
        "jailbreak"
    };

        public void Validate(string message)
        {
            if (string.IsNullOrWhiteSpace(message))
                throw new Exception("Modification cannot be empty.");

            if (message.Length > 500)
                throw new Exception("Modification too long.");

            var lower = message.ToLower();

            if (BlockedPatterns.Any(p => lower.Contains(p)))
                throw new Exception("Invalid modification request.");

            //if (!AllowedKeywords.Any(k => lower.Contains(k)))
            //    throw new Exception("Only meal plan modifications are allowed.");
        }
    }
}