using System;
using System.Collections.Generic;
using Entitas;
using JNGame.Util.Types;

namespace JNGame.EntitasExtend
{
    public abstract class JNLookup
    {
        
        private int _index = 0;
        
        public int Count => _index + 1;

        public int Next()
        {
            return _index++;
        }


        private readonly KeyValue<int, Type> _types = new();

        public JNLookup()
        {
            BindIndex();
            BindType(_types);
        }

        protected abstract void BindIndex();
        protected abstract void BindType(KeyValue<int, Type> types);
        
        //查询下标
        public int GetIndex(Type type)
        {
            return _types.Value2Key(type);
        }
        //查询下标
        public int GetIndex<T>()
        {
            return _types.Value2Key(typeof(T));
        }
        
    }
}