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

namespace AirFighter
{
    internal class SetAircraftsGeneric<T>
        where T : class
    {
        private readonly T[] _places;

        public int Count => _places.Length;

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

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

        public int Insert(T aircraft, int position)
        {
            int emptypos = -1;

            if (position >= Count && position < 0)
            {
                return -1;
            }

            if (_places[position] == null)
            {
                _places[position] = aircraft;
                return position;
            }

            for (int i = position; i < Count; i++)
            {
                if (_places[i] == null)
                {
                    emptypos = i;
                    break;
                }
            }

            if (emptypos != -1)
            {
                for (int i = emptypos; i > position; i--)
                {
                    _places[i] = _places[i - 1];
                }
                _places[position] = aircraft;
                return position;
            }

            return -1;

        }

        public T Remove(int position)
        {
            if (position < Count && position >= 0)
            {
                T result = _places[position];

                _places[position] = null;
                return result;
            }

            return null;
        }

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