using System;

namespace Fusion.Addons.SimpleKCC
{
    internal sealed class KCCFastStack<T> where T : class, new()
    {
        private T[] _items;

        private int _count;

        public KCCFastStack(int capacity, bool createInstances)
        {
            _items = new T[capacity];
            _count = 0;
            if (createInstances)
            {
                _count = capacity;
                for (int i = 0; i < capacity; i++)
                {
                    _items[i] = new T();
                }
            }
        }

        public T PopOrCreate()
        {
            if (_count > 0)
            {
                _count--;
                return _items[_count];
            }

            return new T();
        }

        public void Push(T item)
        {
            if (_count == _items.Length)
            {
                Array.Resize(ref _items, _items.Length * 2);
            }

            _items[_count] = item;
            _count++;
        }
    }
}