Homework43

using System;
using System.Collections.Generic;

namespace Homework43_
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Trader trader = new Trader();
            Salesman salesman = new Salesman(500);
            Customer customer = new Customer(50);

            bool isWork = true;
            string userInput;

            while (isWork)
            {
                Console.WriteLine($"Деньги продавца: ${salesman.Money} \nВаши деньги: ${customer.Money}\n");
                Console.WriteLine("1 - Продавец показывает его товар.");
                Console.WriteLine("2 - Купить товар.");
                Console.WriteLine("3 - Показать преобретенные у продавца товары.");
                Console.WriteLine("4 - Выход");
                userInput = Console.ReadLine();

                switch (userInput)
                {
                    case "1":
                        salesman.ShowInventory();
                        break;

                    case "2":
                        trader.ToBargain(customer, salesman);
                        break;

                    case "3":
                        customer.ShowInventory();
                        break;

                    case "4":
                        isWork = false;
                        break;

                    default:
                        Console.WriteLine("Неверная команда!");
                        break;
                }

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

    class Trader
    {
        protected List<Product> Inventory = new List<Product>();

        public int Money { get; protected set; }

        public void ToBargain(Customer customer, Salesman salesman)
        {
            salesman.ShowInventory();

            if (salesman.CheckAvailableProduct(out Product product))
            {
                customer.AddToInventory(product);
                salesman.RemoveFromInventory(product);
                Console.WriteLine("Вы купили {0}", product.Name);
            }
            else
            {
                Console.WriteLine("Товар не найден!.");
            }
        }

        public virtual void ShowInventory()
        {
            foreach (Product product in Inventory)
            {
                Console.WriteLine(product.Name);
            }
        }

        protected void AddToInventory(Product product)
        {
            GivePayment(product);
            Inventory.Add(product);
        }

        protected void RemoveFromInventory(Product product)
        {
            AcceptPayment(product);
            Inventory.Remove(product);
        }

        protected void AcceptPayment(Product product)
        {
            Money += product.Cost;
        }

        protected void GivePayment(Product product)
        {
            Money -= product.Cost;
        }
    }

    class Customer : Trader
    {
        public Customer(int money)
        {
            Money = money;
        }
    }

    class Salesman : Trader
    {
        public Salesman(int money)
        {
            Money = money;
            Inventory.Add(new Product("Мясо", 15));
            Inventory.Add(new Product("Молоко", 8));
            Inventory.Add(new Product("Рис", 4));
            Inventory.Add(new Product("Вода", 1));
            Inventory.Add(new Product("Хлеб", 2));
            Inventory.Add(new Product("Масло", 10));
        }

        public bool CheckAvailableProduct(out Product product)
        {
            Console.Write("Введите наименование товара: ");
            string userInput = Console.ReadLine();

            foreach (Product productInInventory in Inventory)
            {
                if (productInInventory.Name.ToLower() == userInput.ToLower())
                {
                    product = productInInventory;
                    return true;
                }
            }

            product = null;
            return false;
        }

        public override void ShowInventory()
        {
            foreach (Product product in Inventory)
            {
                Console.WriteLine(product.Name + " - $" + product.Cost);
            }
        }
    }

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

        public int Cost { get; private set; }

        public Product(string name, int cost)
        {
            Name = name;
            Cost = cost;
        }
    }
}