using System;
using System.Collections.Generic;

namespace Game
{
    public class MetaDataHandler
    {
        private readonly Dictionary<IMetaData, List<Delegate>> _metaDataDict= new Dictionary<IMetaData, List<Delegate>>();
        
        protected virtual void OnCreateBind() { }
        protected void CreateBind()
        {
            OnCreateBind();
        }
        protected void ClearBind()
        {
            foreach (var kvp in _metaDataDict)
            {
                var metaData = kvp.Key;
                foreach (var handler in kvp.Value)
                {
                    metaData.RemoveEvent(handler);
                }
            }
            _metaDataDict.Clear();
        }
        protected void ReBindData<TData>(MetaBase<TData> metaData, EventMetaData<TData> handler)
        {
            UnbindData(metaData);
            BindData(metaData, handler);
        }
        protected void BindData<TData>(MetaBase<TData> metaData, EventMetaData<TData> handler)
        {
            metaData.AddEvent(handler);
            var metaInter = (IMetaData)metaData;
            if (!_metaDataDict.ContainsKey(metaInter))
            {
                _metaDataDict[metaInter] = new List<Delegate>();
            }
            _metaDataDict[metaInter].Add(handler);
        }
        protected void UnbindData<TData>(MetaBase<TData> metaData)
        {
            var metaInter = (IMetaData)metaData;
            if (_metaDataDict.ContainsKey(metaInter))
            {
                foreach (var handler in _metaDataDict[metaInter])
                {
                    metaData.RemoveEvent(handler);
                }
                _metaDataDict[metaInter].Clear();
            }
            _metaDataDict.Remove(metaInter);
        }
    }
}