Shop

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            bool isOpen = true;
            Product product;
            Seller seller = new Seller();

            Console.WriteLine("Добрый день. Сколько у вас монет?");
            int playerMoney = Convert.ToInt32(Console.ReadLine());

            Player player = new Player(playerMoney);

            while (isOpen)
            {
                Console.WriteLine("Выберите команду");
                Console.WriteLine("1 - Список товаров у продавца\n" + "2 - Купить товар\n" +
                    "3 - Список товаров у игрока\n" + "0 - Выход из программы");
                int userInput = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine();
                Console.Clear();
                switch (userInput)
                {
                    case 1:
                        seller.ShowSellerInventory();
                        break;
                    case 2:
                        seller.ShowSellerInventory();
                        Console.WriteLine("Выберите номер товара, который хотите купить\n");
                        int userNumber = Convert.ToInt32(Console.ReadLine()) - 1;

                        product = seller.GetProduct(userNumber);

                        if (player.IsEnoughMoney(product) == true)
                        {
                            seller.SellProduct(userNumber);
                        }
                        break;
                    case 3:
                        player.ShowPlayerProducts();
                        break;
                    case 0:
                        isOpen = false;
                        break;
                    default:
                        Console.WriteLine("Недопустимое значение");
                        break;
                }
            }
        }
    }

    class Inventory
    {
        private Product[] _products;

        public Product[] Products
        {
            get
            {
                return _products;
            }
        }

        public Inventory()
        {
            _products = new Product[] {new Product("Печенье", 70),
                new Product("Молоко", 50), new Product("Яблоки", 150),
                new Product("Сыр", 200), new Product("Киви", 120) };
        }
    }

    class Product
    {
        public string Name { get; private set; }
        public int Price { get; private set; }

        public Product(string name, int price)
        {
            Name = name;
            Price = price;
        }

        public void ShowInfo()
        {
            Console.WriteLine(Name + ", цена " + Price + "у.е.");
        }
    }

    class Player
    {
        private Product[] _products = new Product[0];
        private int _money;

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

        public bool IsEnoughMoney(Product product)
        {
            bool isEnoughMoney = false;

            if (_money >= product.Price)
            {
                _money -= product.Price;
                AddProduct(product);
                Console.WriteLine("Товар куплен");
                Console.WriteLine("\nУ игрока осталось " + _money + " монет\n");

                isEnoughMoney = true;
            }
            else
            {
                Console.WriteLine("У игрока недостаточно денег");
            }

            return isEnoughMoney;
        }

        public void AddProduct(Product product)
        {
            Product[] tempArray = new Product[_products.Length + 1];

            for (int i = 0; i < _products.Length; i++)
            {
                tempArray[i] = _products[i];
            }

            tempArray[tempArray.Length - 1] = product;
            _products = tempArray;
        }

        public void ShowPlayerProducts()
        {
            for (int i = 0; i < _products.Length; i++)
            {
                Console.Write(i + 1 + ") ");
                _products[i].ShowInfo();
            }
        }
    }

    class Seller
    {
        private Inventory _inventory = new Inventory();
        private Product[] _products;

        public Seller()
        {
            _products = _inventory.Products;
        }

        public Product GetProduct(int index)
        {
            return _products[index];
        }

        public void SellProduct(int index)
        {
            Product[] tempArray = new Product[_products.Length - 1];

            for (int i = 0; i < index; i++)
            {
                tempArray[i] = _products[i];
            }

            for (int i = index; i < tempArray.Length; i++)
            {
                tempArray[i] = _products[i + 1];
            }
            _products = tempArray;
        }

        public void ShowSellerInventory()
        {
            for (int i = 0; i < _products.Length; i++)
            {
                Console.Write(i + 1 + ") ");
                _products[i].ShowInfo();
            }
        }
    }
}