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

namespace InABox.Core
{
    
    public interface IAutoEntityUnionGenerator : IAutoEntityGenerator
    {
        Type[] Entities { get; }
        IFilter? Filter(Type type);
    }
    
    public abstract class AutoEntityUnionGenerator<TInterface> : IAutoEntityUnionGenerator
    {
        public AutoEntityUnionGenerator()
        {
            Configure();
        }

        private Dictionary<Type,IFilter> _entities = new Dictionary<Type, IFilter>();
                
        public Type[] Entities => _entities.Keys.ToArray();

        public IFilter? Filter(Type type) => _entities.ContainsKey(type) ? _entities[type] : null;

        public void Add<TType>(Filter<TType> filter = null) where TType : TInterface
        {
            _entities[typeof(TType)] = filter;
        }

        protected abstract void Configure(); 
        
        public Type Definition => typeof(TInterface);
        
        public abstract bool Distinct { get; }
    }
}