/******************************************************************************
 * Copyright (C) Ultraleap, Inc. 2011-2021.                                   *
 *                                                                            *
 * Use subject to the terms of the Apache License 2.0 available at            *
 * http://www.apache.org/licenses/LICENSE-2.0, or another agreement           *
 * between Ultraleap and you, your company or other organization.             *
 ******************************************************************************/

namespace Leap.Unity
{

    public class DelayBuffer<T>
    {

        private RingBuffer<T> _buffer;

        /// <summary> Returns the underlying Buffer object. </summary>
        public RingBuffer<T> Buffer { get { return _buffer; } }

        public int Count { get { return _buffer.Count; } }

        public bool IsFull { get { return _buffer.IsFull; } }

        public bool IsEmpty { get { return _buffer.IsEmpty; } }

        public int Capacity { get { return _buffer.Capacity; } }

        public void Clear() { _buffer.Clear(); }

        public DelayBuffer(int bufferSize)
        {
            _buffer = new RingBuffer<T>(bufferSize);
        }

        /// <summary> Returns true if the buffer was full and out "delayedT" will
        /// contain the oldest value in the buffer, otherwise returns false. </summary>
        public bool Add(T t, out T delayedT)
        {
            bool willOutputValue;
            if (_buffer.IsFull)
            {
                willOutputValue = true;
                delayedT = _buffer.GetOldest();
            }
            else
            {
                willOutputValue = false;
                delayedT = default(T);
            }
            _buffer.Add(t);
            return willOutputValue;
        }

    }

}