Task 43 Shop

namespace IJunior
{
    public class Program
    {
        private static void Main(string[] args)
        {
            Salesman salesman = new Salesman(new List<Product>(), 0);
            Buyer buyer = new Buyer(new List<Product>(), 15);

            salesman.AddProductList();

            salesman.ShowInfo();

            buyer.PayForProduct(salesman.SellProduct(buyer.ChooseProduct()));

            buyer.ShowInfo();
        }
    }

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

        public void ShowInfo()
        {
            foreach (var product in Products)
            {
                product.ShowInfo();
            }

            Console.WriteLine("Количество денег: " + Money);
        }
    }

    public class Salesman : Human
    {
        public Salesman(List<Product> products, int money)
        {
            Products = products;
            Money = money;
        }

        public Product SellProduct(string productName)
        {
            Product productForSale = Products.Find(delegate (Product product) { return product.Name == productName; });

            if (productForSale == null == false)
            {
                Money += productForSale.Price;

                return productForSale;
            }
            else
            {
                Console.WriteLine("Данного товара нет на прилавке");

                return productForSale;
            }
        }

        public void AddProductList()
        {
            Console.WriteLine("Введите наименование товара: ");
            string name = Console.ReadLine();

            Console.WriteLine("Выставьет цену: ");

            if (int.TryParse(Console.ReadLine(), out int price))
            {
                Products.Add(new Product(name, price));
            }
        }
    }

    public class Buyer : Human
    {
        public Buyer(List<Product> products, int money)
        {
            Products = products;
            Money = money;
        }

        public string ChooseProduct()
        {
            Console.WriteLine("Выберите вещь для покупки: ");
            string productName = Console.ReadLine();

            return productName;
        }

        public void PayForProduct(Product product)
        {
            if (product == null == false)
            {
                Products.Add(product);
                Money -= product.Price;
            }
        }
    }

    public 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(Name + ". Цена: " + Price);
        }
    }
}