using System;
using System.Collections.Generic;
using System.Text;

namespace ln.objects.index
{
    public class IndexLeaf
    {
        public Type LeafType { get; set; }
        public string LeafName { get; set; }

        public Index Index { get; set; }

        Dictionary<string, IndexLeaf> leafs = new Dictionary<string, IndexLeaf>();
        Func<object, object> leafGetter;

        public IndexLeaf()
        {
        }
        public IndexLeaf(Type valueType, string leafName, Func<object, object> getter)
        {
            LeafType = valueType;
            LeafName = leafName;
            leafGetter = getter;
        }

        public IndexLeaf GetLeaf(string path) => leafs[path];

        public void AddLeaf(IndexLeaf indexLeaf) => leafs.Add(indexLeaf.LeafName, indexLeaf);
        public void RemoveLeaf(string leafName) => leafs.Remove(leafName);

        public void Reindex(Guid uid, object value)
        {
            Index?.Reindex(uid, value);
            foreach (IndexLeaf indexLeaf in leafs.Values)
                indexLeaf.Reindex(uid, indexLeaf.leafGetter(value));
        }
        public void Remove(Guid uid)
        {
            Index?.Remove(uid);
            foreach (IndexLeaf indexLeaf in leafs.Values)
                indexLeaf.Remove(uid);
        }

        public void Clear()
        {
            Index?.Clear();
            foreach (IndexLeaf indexLeaf in leafs.Values)
                indexLeaf.Clear();
        }

        public void Match(Func<object, bool> criterion, ISet<Guid> matches) => Index?.Match(criterion, matches);

    }
}