using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WinFormsApp1
{
    internal class SetTraktorGeneric<T>
              where T : class
    {
        private readonly T[] _places;
        public int Count => _places.Length;
        private int TractorPlaces = 0;

        public SetTraktorGeneric(int count)
        {
            _places = new T[count];
        }

        public int Insert(T tractor)
        {
            return Insert(tractor, 0);
        }

        public int Insert(T tractor, int position)
        {
            if (position < 0 || position >= _places.Length || TractorPlaces == _places.Length)
            {
                return -1;
            }
            TractorPlaces++;
            while (_places[position] != null)
            {
                for (int i = _places.Length - 1; i > 0; --i)
                {
                    if (_places[i] == null && _places[i - 1] != null)
                    {
                        _places[i] = _places[i - 1];
                        _places[i - 1] = null;
                    }
                }
            }
            _places[position] = tractor;
            return position;
        }

        public T Remove(int position)
        {
            if (position < 0 || position >= _places.Length) return null;
            T savedTractor = _places[position];
            _places[position] = null;
            return savedTractor;
        }

        public T Get(int position)
        {
            if (position < 0 || position >= _places.Length) return null;
            return _places[position];
        }
    }
}