namespace NAK.PropSpawnTweaks;

public class ObjectPool<T>
{
    public int Count { get; private set; }

    private readonly Queue<T> _available;
    private readonly Func<T> _createObjectFunc;

    public ObjectPool(int numPreallocated = 0, Func<T> createObjectFunc = null)
    {
        _available = new Queue<T>();
        _createObjectFunc = createObjectFunc;

        if (numPreallocated > 0) Give(MakeObject());
    }

    public T Take()
    {
        T t;
        if (_available.Count > 0)
        {
            t = _available.Dequeue();
            Count--;
        }
        else
        {
            t = MakeObject();
        }

        return t;
    }

    public void Give(T t)
    {
        _available.Enqueue(t);
        Count++;
    }

    private T MakeObject()
    {
        if (_createObjectFunc != null) return _createObjectFunc();
        throw new InvalidOperationException("Cannot automatically create new objects without a factory method");
    }
}