namespace AirBomber.Generics
{
    internal class SetGeneric<T>
    {
        private readonly T?[] _objects;

        public int Count => _objects.Length;

        public SetGeneric(int Count)
        {
            _objects = new T?[Count];
        }

        public int Insert(T Entity)
        {
            for (int i = 0; i < Count; i++)
                if (_objects[i] is null)
                {
                    _objects[i] = Entity;
                    return i;
                }

            return -1;
        }

        public int Insert(T Entity, int Position)
        {
            if (Position >= Count)
                return -1;

            if (_objects[Position] is null)
            {
                _objects[Position] = Entity;
                return Position;
            }

            /** Сдвиг элементов вправо начиная с Position до ближайшего пустого места */
            int EmptyPos = -1;

            for (int i = Position + 1; i < Count; i++)
                if (_objects[i] is null)
                {
                    EmptyPos = i;
                    break;
                }

            if (EmptyPos == -1)
                return -1;

            /** Сдвиг */
            for (int i = EmptyPos; i > Position; i--)
                _objects[i] = _objects[i - 1];

            _objects[Position] = Entity;
            return Position;
        }

        public bool Remove(int Position)
        {
            if (Position >= Count)
                return false;

            _objects[Position] = default(T);
            return true;
        }

        public T? Get(int Position)
        {
            if (Position >= Count)
                return default(T);

            return _objects[Position];
        }
    }
}