magazine

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

namespace magazine
{
    class Program
    {
        static void Main(string[] args)
        {
            bool isWork = true;

            Trader trader = new Trader();

            Player player = new Player(1000);

            while (isWork)
            {
                player.ShowBag();

                Console.WriteLine("\n[1] - Показать список товаров;\n" +
                "[2] - Купить товар;\n" +
                "[3] - Выйти из магазина");
                Console.Write("Ввод: ");

                switch (Console.ReadLine())
                {
                    case "1":
                        trader.ShowGoods();
                        break;
                    case "2":
                        trader.Trade(player);
                        break;
                    case "3":
                        isWork = false;
                        break;
                }
            }
        }
    }

    class Trader
    {
        private int _cashbox;
        private List<Goods> _goods = new List<Goods>();

        public Trader()
        {
            Random rand = new Random();

            for (int i = 0; i < 15; i++)
            {
                _goods.Add(new Goods(rand.Next(0, 1000), rand.Next(0, 1000)));
            }
        }

        public void Trade(Player player)
        {
            Console.Write("Выберите товар из списка: ");
            if (int.TryParse(Console.ReadLine(), out int goodsNumber)
                && (goodsNumber >= 0 && goodsNumber < _goods.Count))
            {
                --goodsNumber;

                if (player.CheckMoney(_goods[goodsNumber]))
                {
                    Console.WriteLine("Оплачиваем товар...");
                    _cashbox += player.ToPay(_goods[goodsNumber]);
                    _goods.RemoveAt(goodsNumber);
                }
                else
                {
                    Console.WriteLine("У вас нет денег на товар!");
                    return;
                }
            }
            else
            {
                Console.WriteLine("Товара нет в списке!");
                return;
            }
        }

        public void ShowGoods()
        {
            Console.WriteLine("\nСписок товаров: ");
            for (int i = 0; i < _goods.Count; i++)
            {
                Console.WriteLine($"[№{i + 1}]: #{_goods[i].ProductCode} - ${_goods[i].Price}");
            }
        }
    }

    class Goods
    {
        public int ProductCode { get; private set; }
        public int Price { get; private set; }

        public Goods(int productCode, int price)
        {
            ProductCode = productCode;
            Price = price;
        }
    }

    class Player
    {
        private int _money;

        private List<Goods> _shopingBag = new List<Goods>();

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

        public bool CheckMoney(Goods goods)
        {
            return _money >= goods.Price;
        }

        public int ToPay(Goods goods)
        {
            _money -= goods.Price;
            _shopingBag.Add(goods);
            return goods.Price;
        }

        public void ShowBag()
        {
            Console.WriteLine($"\nКошелек: ${_money}");

            if (_shopingBag.Count != 0)
            {
                Console.WriteLine("Корзина: ");
                foreach (var goods in _shopingBag)
                {
                    Console.WriteLine($"Товар с номером: {goods.ProductCode}");
                }
            }
            else
            {
                Console.WriteLine("Корзина пуста!");
            }
        }
    }
}