using System.Collections.Generic;

namespace ResourceLoading
{

	public class Cache
	{
		private Dictionary<string, Resource> _permanentResources = new Dictionary<string, Resource>();
		private Dictionary<string, Resource> _temporaryResources = new Dictionary<string, Resource>();


		internal bool FindResource(string uri, out Resource resource)
		{
			if (!_permanentResources.TryGetValue(uri, out resource))
				return _temporaryResources.TryGetValue(uri, out resource);
			return true;
		}

        internal void AddResource(string uri, Resource resource, bool permanent)
		{
			if (permanent)
            {
				_permanentResources.Add(uri, resource);
                // increase ref count for permanent resources
                // in order to never release them
                resource.incRefCount();
            }
			else
            {
				_temporaryResources.Add(uri, resource);
            }
		}

        internal void RemoveResource(string uri)
		{
			if (_permanentResources.ContainsKey(uri))
            {
                Resource res = null;
                _permanentResources.TryGetValue(uri, out res);
                res.decRefCount();
				_permanentResources.Remove(uri);
            }
			else if (_temporaryResources.ContainsKey(uri))
            {
                _temporaryResources.Remove (uri);
            }
		}

	}

} // namespace JDCompanionApp.Resources