C# Junior Магазин

gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;

namespace CSLight
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Shop shop = new Shop();

            shop.Work();
        }
    }

    class Shop
    {
        private Merchant _merchant;
        private Bayer _bayer;

        public Shop()
        {
            _merchant = new Merchant(0);
            _bayer = new Bayer(1000);
        }

        public void Work()
        {
            const string CommandTrade = "1";
            const string CommandExit = "Exit";

            string userInput;
            bool isWork = true;

            while (isWork)
            {
                Console.WriteLine("-МАГАЗИН-");
                Console.WriteLine($"{CommandTrade} - Купить товары");
                Console.WriteLine($"{CommandExit} - выход");
                Console.WriteLine(new string('-', 25));
                Console.WriteLine("ИНФОРМАЦИЯ О ПРОДАВЦЕ:");
                _merchant.ShowCash();
                _merchant.ShowProducts();
                Console.WriteLine("\nИНФОРМАЦИЯ О ПОКУПАТЕЛЕ:");
                _bayer.ShowCash();
                _bayer.ShowProducts();
                Console.WriteLine(new string('-', 25));

                userInput = Console.ReadLine();

                switch (userInput)
                {
                    case CommandTrade:
                        Trade(_merchant, _bayer);
                        break;

                    case CommandExit:
                        isWork = false;
                        break;
                }

                Console.ReadKey();
                Console.Clear();
            }
        }

        private void Trade(Merchant merchant, Bayer bayer)
        {
            int number;

            Console.Clear();
            Console.WriteLine("Выберите продукт для покупки:");
            _merchant.ShowProducts();
            number = ReadInt();

            if (number <= 0 || number > _merchant.ProductsCount)
            {
                Console.WriteLine("Продукта под таким номером не существует!");
            }
            else
            {
                number -= 1;

                if (bayer.IsEnoughMoney(merchant.GetProduct(number)))
                {
                    bayer.BuyProduct(merchant.SellProduct(number));
                }
            }
        }

        private int ReadInt()
        {
            int number;

            while (int.TryParse(Console.ReadLine(), out number) == false)
            {
                Console.WriteLine("Некорректный ввод! Попробуйте снова!");
            }

            return number;
        }
    }

    class Human
    {
        protected List<Product> Products;
        protected int Money;

        public Human(int money)
        {
            Products = new List<Product>();
            Money = money;
        }

        public void ShowProducts()
        {
            int productsCounter = 1;

            Console.WriteLine("Продукты: ");

            for (int i = 0; i < Products.Count; i++)
            {
                Console.Write($"{productsCounter}.");
                Products[i].ShowInfo();
                productsCounter++;
            }
        }

        public void ShowCash()
        {
            Console.WriteLine($"Деньги: {Money} руб.");
        }
    }

    class Merchant : Human
    {
        public Merchant(int money) : base(money)
        {
            Products = new List<Product>() { new Product("Яблоко", 50), new Product("Апельсин", 100), new Product("Манго", 1000) };
        }

        public int ProductsCount => Products.Count;

        public Product GetProduct(int number)
        {
            return Products[number];
        }

        public Product SellProduct(int number)
        {
            Product productForSale = null;

            productForSale = Products[number];
            Products.RemoveAt(number);
            Money += productForSale.Price;

            return productForSale;
        }
    }

    class Bayer : Human
    {
        private int _moneyToPay;

        public Bayer(int money) : base(money) { }

        public bool IsEnoughMoney(Product product)
        {
            _moneyToPay = product.Price;

            if (Money >= _moneyToPay)
            {
                return true;
            }
            else
            {
                Console.WriteLine("Недостаточно денег(");
                _moneyToPay = 0;
                return false;
            }
        }

        public void BuyProduct(Product product)
        {
            Money -= _moneyToPay;

            Products.Add(product);
        }
    }

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

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

        public void ShowInfo()
        {
            Console.WriteLine($"|Товар: {Name}, цена - {Price}");
        }
    }
}