namespace ElectricLocomotive;

public class SetGeneric <T> where T : class
{
    private readonly T?[] _places;

    public int Count => _places.Length;

    public SetGeneric(int count)
    {
        _places = new T?[count];
    }
    public int Insert(T electricLocomotiv)
    {
        if (_places[Count - 1] != null)
            return -1;
        return Insert(electricLocomotiv, 0);
    }

    public int Insert(T electricLocomotiv, int position)
    {
        if (!(position >= 0 && position < Count))
            return -1;
        if (_places[position] != null) {
            int ind = position;
            while (ind < Count && _places[ind] != null)
                ind++;
            if (ind == Count)
                return -1;
            for (int i = ind - 1; i >= position; i--)
                _places[i + 1] = _places[i];
        }
        _places[position] = electricLocomotiv;
        return position;
    }

    public bool Remove(int position)
    {
        if (!(position >= 0 && position < Count) || _places[position] == null)
            return false;
        _places[position] = null;
        return true;
    }

    public T? Get(int position)
    {
        if (!(position >= 0 && position < Count))
            return null;
        return _places[position];
    }

}