ДЗ: Супермаркет

.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp1
{
    public class Program
    {
        static void Main(string[] args)
        {
            Console.InputEncoding = Encoding.Unicode;
            Console.OutputEncoding = Encoding.Unicode;

            var supermarket = new Supermarket();
            supermarket.Run();
        }
    }

    static class RandomUtils
    {
        private static readonly Random _random = new Random();

        public static int Next(int minValue, int maxValue)
        {
            return _random.Next(minValue, maxValue);
        }

        public static int Next(int maxValue)
        {
            return _random.Next(maxValue);
        }
    }

    class Supermarket
    {
        private const int CommandServeNext = 1;
        private const int CommandAddCustomer = 2;
        private const int CommandShowQueue = 3;
        private const int CommandShowProducts = 4;
        private const int CommandShowEarnings = 5;
        private const int CommandExit = 6;

        private const int MinProductsInCart = 1;
        private const int MaxProductsInCart = 6;
        private const int InitialCustomersCount = 3;

        private readonly List<Product> _products;
        private readonly Queue<Customer> _customers;
        private int _earnedMoney;

        public Supermarket()
        {
            _products = new List<Product>
            {
                new Product("Яблоко", 50),
                new Product("Груша", 40),
                new Product("Банан", 70),
                new Product("Манго", 100),
                new Product("Дыня", 60),
                new Product("Арбуз", 300)
            };

            _customers = new Queue<Customer>();
            _earnedMoney = 0;

            for (int i = 0; i < InitialCustomersCount; i++)
            {
                _customers.Enqueue(CreateRandomCustomer());
            }
        }

        public void Run()
        {
            bool isRunning = true;

            while (isRunning)
            {
                ShowMenu();

                int command = GetNumberInput("Введите команду:");

                switch (command)
                {
                    case CommandServeNext:
                        ServeNext();
                        break;
                    case CommandAddCustomer:
                        AddCustomer();
                        break;
                    case CommandShowQueue:
                        ShowQueue();
                        break;
                    case CommandShowProducts:
                        ShowProducts();
                        break;
                    case CommandShowEarnings:
                        ShowEarnings();
                        break;
                    case CommandExit:
                        isRunning = false;
                        break;
                    default:
                        Console.WriteLine("Неизвестная команда. Попробуйте снова.");
                        break;
                }
            }
        }

        private void ShowMenu()
        {
            Console.WriteLine();
            Console.WriteLine($"{CommandServeNext} - Обслужить следующего клиента");
            Console.WriteLine($"{CommandAddCustomer} - Добавить клиента в очередь");
            Console.WriteLine($"{CommandShowQueue} - Показать очередь клиентов");
            Console.WriteLine($"{CommandShowProducts} - Показать товары супермаркета");
            Console.WriteLine($"{CommandShowEarnings} - Показать заработанные деньги");
            Console.WriteLine($"{CommandExit} - Выйти");
        }

        private int GetNumberInput(string message)
        {
            Console.WriteLine(message);
            string input = Console.ReadLine();
            int number;

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

            return number;
        }

        private void ShowProducts()
        {
            Console.WriteLine("Товары супермаркета:");

            foreach (var product in _products)
            {
                product.ShowInfo();
            }
        }

        private void ShowQueue()
        {
            if (_customers.Count == 0)
            {
                Console.WriteLine("Очередь пуста.");
                return;
            }

            int i = 1;

            foreach (var customer in _customers)
            {
                Console.WriteLine($"{i++}. Клиент с {customer.Money} руб., товаров в корзине: {customer.CartCount}");
            }
        }

        private void AddCustomer()
        {
            _customers.Enqueue(CreateRandomCustomer());
            Console.WriteLine("Клиент добавлен в очередь.");
        }

        private Customer CreateRandomCustomer()
        {
            int productsCount = RandomUtils.Next(MinProductsInCart, MaxProductsInCart + 1);

            var cart = new List<Product>();

            for (int i = 0; i < productsCount; i++)
            {
                Product product = _products[RandomUtils.Next(_products.Count)];
                cart.Add(product);
            }

            return new Customer(cart);
        }

        private void ServeNext()
        {
            if (_customers.Count == 0)
            {
                Console.WriteLine("Очередь пуста.");
                return;
            }

            var customer = _customers.Dequeue();
            Console.WriteLine($"Обслуживается клиент с {customer.Money} руб.");
            Console.WriteLine("Корзина:");
            customer.ShowCart();

            int total = customer.GetCartTotal();

            TryRemoveProductsUntilAffordable(customer, ref total);

            if (customer.CartCount == 0)
            {
                Console.WriteLine("Клиент не смог купить ни одного товара.");
                return;
            }

            customer.Pay(total);
            _earnedMoney += total;
            customer.MoveCartToBag();

            Console.WriteLine($"Покупка совершена на сумму {total} руб. Осталось денег: {customer.Money} руб.");
            Console.WriteLine("Купленные товары:");
            customer.ShowBag();
        }

        private void TryRemoveProductsUntilAffordable(Customer customer, ref int total)
        {
            while (total > customer.Money && customer.CartCount > 0)
            {
                int removeIndex = RandomUtils.Next(customer.CartCount);
                Product removed = customer.RemoveFromCart(removeIndex);
                Console.WriteLine($"Клиент не может оплатить покупку. Удалён товар: {removed.Name} ({removed.Price} руб.)");
                total = customer.GetCartTotal();
            }
        }

        private void ShowEarnings()
        {
            Console.WriteLine($"Всего заработано: {_earnedMoney} руб.");
        }
    }

    class Product
    {
        private int _nextId = 1;

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

        public int Id { get; }
        public string Name { get; }
        public int Price { get; }

        public void ShowInfo()
        {
            Console.WriteLine($"ID: {Id}, Название: {Name}, Цена: {Price}");
        }
    }

    class Customer
    {
        private const int MinCustomerMoney = 500;
        private const int MaxCustomerMoney = 2000;

        private readonly List<Product> _cart;
        private readonly List<Product> _bag;

        public Customer(List<Product> cart)
        {
            Money = RandomUtils.Next(MinCustomerMoney, MaxCustomerMoney + 1);
            _cart = cart;
            _bag = new List<Product>();
        }

        public int Money { get; private set; }
        public int CartCount => _cart.Count;

        public int GetCartTotal()
        {

            int sum = 0;

            foreach (var product in _cart)
                sum += product.Price;

            return sum;
        }

        public void ShowCart()
        {
            if (_cart.Count == 0)
            {
                Console.WriteLine("Корзина пуста.");
                return;
            }

            foreach (var product in _cart)
                product.ShowInfo();
        }

        public void ShowBag()
        {
            if (_bag.Count == 0)
            {
                Console.WriteLine("Сумка пуста.");
                return;
            }

            foreach (var product in _bag)
                product.ShowInfo();
        }

        public Product RemoveFromCart(int index)
        {
            Product product = _cart[index];
            _cart.RemoveAt(index);
            return product;
        }

        public void Pay(int amount)
        {
            Money -= amount;
        }

        public void MoveCartToBag()
        {
            _bag.AddRange(_cart);
            _cart.Clear();
        }
    }
}