using ln.collections;
using System;
using System.Collections.Generic;
using System.Text;

namespace ln.objects
{
    class ObjectCache
    {
        WeakKeyReferenceDictionary<object, Guid> guidLookup = new WeakKeyReferenceDictionary<object, Guid>();
        WeakValueDictionary<Guid, object> objectLookup = new WeakValueDictionary<Guid, object>();

        public ObjectCache()
        { }

        public object this[Guid uid] => objectLookup[uid];
        public Guid this[object o] => guidLookup[o];

        public bool TryGetUID(object o, out Guid uid) => guidLookup.TryGetValue(o, out uid);
        public bool TryGetObject(Guid uid, out object o) => objectLookup.TryGetValue(uid, out o);

        public void Add(Guid uid, object o)
        {
            guidLookup.Add(o, uid);
            objectLookup.Add(uid, o);
        }

        public void Remove(Guid uid)
        { 
            guidLookup.Remove(objectLookup[uid]);
            objectLookup.Remove(uid);
        }
        public void Remove(object o)
        {
            objectLookup.Remove(guidLookup[o]);
            guidLookup.Remove(o);
        }

    }
}