ООП-4

using System;
using System.Collections.Generic;

namespace Homework4
{
    class Program
    {
        static void Main(string[] args)
        {
            Shop shop = new Shop();
            shop.Trade();
        }
    }

    class Item
    {
        public string Label { get; private set; }
        public int Price { get; private set; }

        public Item(string label, int price)
        {
            Label = label;
            Price = price;
        }
    }

    class Trader
    {
        private List<Item> _items;

        public Trader(List<Item> items)
        {
            _items = items;
        }

        public Trader() { }

        public void ShowItems()
        {
            Console.WriteLine("~~Товары~~");
            foreach (var item in _items)
            {
                Console.WriteLine(item.Label + " - " + item.Price);
            }
            Console.WriteLine("~~~~~~~~~~");
        }

        public Item SellItem()
        {
            string tempLabel = GetItemLabel();
            int index = -1;

            bool isItemAvailable = false;
            for (int i = 0; i < _items.Count; i++)
            {
                if (_items[i].Label.ToLower() == tempLabel.ToLower())
                {
                    index = i;
                    isItemAvailable = true;
                    break;
                }
            }

            if (isItemAvailable == true)
            {
                return _items[index];
            }
            else
            {
                Console.WriteLine("Такого товара нет!");
                return null;
            }
        }

        private string GetItemLabel()
        {
            Console.Write("Введите название товара: ");

            return Console.ReadLine();
        }
    }

    class Player
    {
        private List<Item> _inventory = new List<Item>();

        public int Money { get; private set; }

        public Player(int money)
        {
            Money = money;
        }

        public Player() { }

        public void ShowInventory()
        {
            Console.WriteLine("~~Инвентарь~~");

            foreach (var item in _inventory)
            {
                Console.Write('|');
                Console.Write(item.Label);
                Console.WriteLine('|');
            }
            Console.WriteLine(Money + " денег");
            Console.WriteLine("~~~~~~~~~~");
        }

        public void BuyItem(Item item)
        {
            if (item != null)
            {
                _inventory.Add(item);
                Money -= item.Price;
            }
        }
    }

    class Shop
    {
        private Player _player;
        private Trader _trader;

        public Shop()
        {
            _player = new Player(33);
            _trader = new Trader(new List<Item> { new Item("q", 5), new Item("w", 7), new Item("e", 9), new Item("r", 11) });
        }

        public void Trade()
        {
            while (_player.Money > 0)
            {
                _trader.ShowItems();
                _player.ShowInventory();

                Item itemToBuy = _trader.SellItem();
                if (itemToBuy.Price <= _player.Money)
                {
                    _player.BuyItem(itemToBuy);
                }
                else
                {
                    Console.WriteLine("У вас не хватил денег на это товар!");
                }

                Console.Clear();
            }

            Console.WriteLine("У вас закончились деньги!");
            _player.ShowInventory();
            Console.ReadKey();
        }
    }

}