// Knowledge pipeline for processing atomic facts

using System;
using System.Collections.Generic;
using System.Linq;

namespace AIBrain.Services
{
    public class KnowledgePipeline
    {
        private List<string> facts;

        public KnowledgePipeline()
        {
            facts = new List<string>();
        }

        public void AddFact(string fact)
        {
            if (!string.IsNullOrWhiteSpace(fact))
            {
                facts.Add(fact.Trim());
            }
        }

        public List<string> GetFacts()
        {
            return new List<string>(facts);
        }

        public int Count => facts.Count;

        public List<string> SearchFacts(string query)
        {
            return facts.Where(f => f.Contains(query, StringComparison.OrdinalIgnoreCase)).ToList();
        }

        public void ClearFacts()
        {
            facts.Clear();
        }

        public Dictionary<string, object> GetStatistics()
        {
            return new Dictionary<string, object>
            {
                ["total_facts"] = facts.Count,
                ["unique_facts"] = new HashSet<string>(facts).Count,
                ["avg_length"] = facts.Count > 0 ? facts.Average(f => f.Length) : 0
            };
        }
    }
}