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

namespace ProjectAirFighter.Generics
{
    internal 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 airplane)
        {
            return Insert(airplane, 0);
        }

        public int Insert(T airplane, 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] = airplane;
            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];
        }
    }
}