Supermarket

using System;
using System.Collections.Generic;

namespace Classes
{
    internal class Program
    {
        static void Main()
        {
            Supermarket supermarket = new Supermarket();
            supermarket.Work();
        }
    }

    class Supermarket
    {
        private List<Product> _products = new List<Product>();
        private Queue<Client> _clients = new Queue<Client>();

        private int _revenue;

        private void CreateProducts()
        {
            int productsCount = 100;
            for (int i = 0; i < productsCount; i++)
            {
                _products.Add(new Product(i + 1));
            }
        }

        private void CreateClients()
        {
            int clientsCount = 10;
            for (int i = 0; i < clientsCount; i++)
            {
                _clients.Enqueue(new Client(_products));
            }
        }

        public void Work()
        {
            CreateProducts();
            CreateClients();

            int clientNumber = 1;
            bool isWorking = true;

            while (isWorking)
            {
                _clients.Peek().ShowCard();
                _revenue += _clients.Peek().Buy();
                _clients.Peek().ShowBag();
                _clients.Dequeue();
                ShowRevenue();

                isWorking = _clients.Count > 0;

                if (isWorking)
                {
                    Console.WriteLine($"\nNext client {++clientNumber}\nPress something");
                    Console.ReadKey();
                    Console.Clear();
                }

            }
        }

        private void ShowRevenue() => Console.WriteLine("\nRevenue: " + _revenue);
    }

    class Product
    {
        public Product(int index)
        {
            Initialize(index);
        }

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

        private void Initialize(int index)
        {
            Name = "product " + index;

            int minValue = 50;
            int maxValue = 300;

            Price = UserUtils.GenerateRandomNumber(minValue, maxValue);
        }
    }

    class Client
    {
        private int _wallet;
        private List<Product> _cart = new List<Product>();
        private List<Product> _bag = new List<Product>();

        public Client(List<Product> products)
        {
            Initialize(products);
        }

        public void ShowCard()
        {
            UserUtils.ShowProduct(_cart);
        }

        public int Buy()
        {
            bool canBuy = false;
            int purchasePrice = 0;

            while (canBuy == false)
            {
                purchasePrice = 0;

                foreach (Product product in _cart)
                {
                    purchasePrice += product.Price;
                }

                Console.WriteLine($"\npurchase price: {purchasePrice}");

                if (purchasePrice > _wallet && _cart.Count != 0)
                {
                    ThrowOutPurchase(_cart);
                }
                else if (_cart.Count == 0)
                {
                    Console.WriteLine("\nThere are no purchases in the cart");
                    canBuy = true;
                }
                else
                {
                    Console.WriteLine("\nThere is enough money to buy");
                    canBuy = true;
                    ReplaceInBag(_cart);
                }
            }

            _wallet -= purchasePrice;

            return purchasePrice;
        }

        public void ShowBag()
        {
            Console.WriteLine("Products in the bag:");
            UserUtils.ShowProduct(_bag);
        }

        private void Initialize(List<Product> products)
        {
            int minWalletValue = 500;
            int maxWalletValue = 1000;

            _wallet = UserUtils.GenerateRandomNumber(minWalletValue, maxWalletValue);

            int minProductsCount = 2;
            int maxProductsCount = 10;
            int productsInCart = UserUtils.GenerateRandomNumber(minProductsCount, maxProductsCount);

            for (int i = 0; i < productsInCart; i++)
            {
                int productIndex = UserUtils.GenerateRandomNumber(0, products.Count);
                _cart.Add(products[productIndex]);
            }
        }

        private void ThrowOutPurchase(List<Product> _cart)
        {
            int randomProduct = UserUtils.GenerateRandomNumber(_cart.Count);
            Console.WriteLine($"\nNot enough money to buy\nA random product is thrown out of the cart:{_cart[randomProduct].Name} - price:{_cart[randomProduct].Price}");
            _cart.RemoveAt(randomProduct);
            Console.WriteLine("press something");
            Console.ReadKey();
        }

        private void ReplaceInBag(List<Product> _cart)
        {
            int cartCount = _cart.Count;

            for (int i = 0; i < cartCount; i++)
            {
                _bag.Add(_cart[0]);
                _cart.RemoveAt(0);
            }
        }
    }

    class UserUtils
    {
        private static Random s_random = new Random();

        public static int GenerateRandomNumber(int min, int max) => s_random.Next(min, max);

        public static int GenerateRandomNumber(int max) => s_random.Next(max);

        public static void ShowProduct(List<Product> products)
        {
            int index = 1;

            foreach (Product product in products)
            {
                Console.WriteLine(index++ + " - " + product.Name + " - price:" + product.Price);
            }
        }
    }
}