using System.Collections.Generic;

namespace Backpack
{
    public class Backpack : IBackpack<BackpackItem>
    {
        private List<BackpackItem> _items = new();

        public IReadOnlyList<BackpackItem> Items => _items;

        public void PutItem(BackpackItem item)
        {
            var it = _items.Find(a => a.Equals(item));
            if (it != null)
            {
                var count = it.AddCount(item.Count);
                _items.Add(new BackpackItem(item.Id, item.Name, item.Description, item.ItemType, count, item.MaxCount));
                return;
            }

            _items.Add(new BackpackItem(item.Id, item.Name, item.Description, item.ItemType, item.Count,
                item.MaxCount));
        }

        public void TakeItem(BackpackItem item, int count)
        {
            var it = _items.Find(a => a.Id == item.Id);
            if (it != null)
            {
                _items.Remove(new BackpackItem(item.Id, item.Name, item.Description, item.ItemType, count,
                    item.MaxCount));
                return;
            }
        }

        public BackpackItem GetItem(string name)
        {
            throw new System.NotImplementedException();
        }

        public bool ChangePosition(BackpackItem item1, BackpackItem item2)
        {
            throw new System.NotImplementedException();
        }

        public void DuiDie()
        {
            throw new System.NotImplementedException();
        }
    }
}