using System;
using System.Collections.Generic;

namespace FlowScope.Resources
{
    public sealed class ResourceGroup : IResourceGroup
    {
        private readonly HashSet<IDisposable> _handles = new();
        private bool _disposed;

        public int Count => _handles.Count;

        public void Add<T>(IResourceHandle<T> handle) where T : class
        {
            if (_disposed)
            {
                throw new ObjectDisposedException(nameof(ResourceGroup));
            }

            if (handle == null)
            {
                throw new ArgumentNullException(nameof(handle));
            }

            _handles.Add(handle);
        }

        public void Dispose()
        {
            if (_disposed)
            {
                return;
            }

            _disposed = true;
            foreach (var handle in _handles)
            {
                handle.Dispose();
            }

            _handles.Clear();
        }
    }
}