namespace Backpack
{
    public class BackpackItem : IBackpackItem
    {
        private int _id;
        private string _name;
        private string _description;
        private ItemType _itemType;
        private int _count;
        private int _maxCount;

        public int Id => _id;

        public string Name => _name;

        public string Description => _description;

        public ItemType ItemType => _itemType;

        public int Count => _count;

        public int MaxCount => _maxCount;

        public BackpackItem(int id, string name, string description, ItemType itemType, int count, int maxCount)
        {
            _id = id;
            _name = name;
            _description = description;
            _itemType = itemType;
            _count = count;
            _maxCount = maxCount;
        }

        public bool Equals(IBackpackItem other)
        {
            return Id == other.Id;
        }

        public int AddCount(int count)
        {
            int tmp = _count + count;
            _count = tmp > _maxCount ? _maxCount : _count;
            return tmp > _maxCount ? tmp - _maxCount : 0;
        }
    }
}