task33

using System;
using System.Collections.Generic;
using System.Threading;

public class Program
{
    public static void Main()
    {
        int timeSleep = 700;
        Shop shop = new Shop();

        while (shop.IsOver() != true)
        {
            shop.Update();
            Thread.Sleep(timeSleep);
        }
    }
}

public class Shop
{
    private Customer _customer;
    private Random _random;
    private int _amountClients;
    private int _amountMoneyCashBox;

    private int _amountItemsMinimum = 5;
    private int _amountItemsMaximum = 20;
    private int _priceItemMinimum = 10;
    private int _priceItemMaximum = 400;
    private int _walletCustomerMinimum = 100;
    private int _walletCustomerMaximum = 2500;
    private int _amountClientsMinimum = 10;
    private int _amountClientsMaximum = 100;

    private string[] _namesItems =
    {
        "Milk", "Bread", "Sausages",
        "Cheese", "Butter", "Chocolate nuts"
    };

    public Shop()
    {
        _random = new Random();
        _amountMoneyCashBox = 0;
        _amountClients = _random.Next(_amountClientsMinimum, _amountClientsMaximum);
        CreateCustomer();
    }

    public void Update()
    {
        PrintCustomers();
        TryTrade();
    }

    public void PrintCustomers()
    {
        Console.Clear();
        Console.WriteLine("Customers stay in order : " + _amountClients);
        Console.WriteLine("Money in cashbox : " + _amountMoneyCashBox);
        Console.WriteLine(_customer);
    }

    public void TryTrade()
    {
        if (_customer.PriceTotalItemes <= _customer.Wallet)
        {
            Console.WriteLine("Client bought items");
            _amountMoneyCashBox += _customer.PriceTotalItemes;
            CreateCustomer();
        }
        else
        {
            if (_customer.IsEmptyItems())
            {
                Console.WriteLine("Customer haven't items to buy.");
                CreateCustomer();
            }
            else
            {
                Console.WriteLine("Customer haven't enought money.");
                int indexItem = _random.Next(0, _customer.AmountItems);
                _customer.RemoveItem(indexItem);
            }
        }
    }

    public bool IsOver()
    {
        return _amountClients < 0;
    }

    private void CreateCustomer()
    {
        --_amountClients;
        int amountItems = _random.Next(_amountItemsMinimum, _amountItemsMaximum);
        int wallet = _random.Next(_walletCustomerMinimum, _walletCustomerMaximum);
        _customer = new Customer(wallet);
        string name;
        int price;
        Item item;

        for (int i = 0; i < amountItems; ++i)
        {
            name = _namesItems[_random.Next(0, _namesItems.Length)];
            price = _random.Next(_priceItemMinimum, _priceItemMaximum);
            item = new Item(name, price);
            _customer.AddItem(item);
        }
    }
}

public class Customer
{
    private List<Item> _items;

    public int Wallet { get; private set; }
    public int PriceTotalItemes { get; private set; }
    public int AmountItems => _items.Count;

    public Customer(int wallet)
    {
        Wallet = wallet;
        _items = new List<Item>();
    }

    public override string ToString()
    {
        string result = "";
        result += "Wallet : " + Wallet + " \n";
        result += "Total price of items : " + PriceTotalItemes + " \n";

        for (int i = 0; i < _items.Count; ++i)
            result += String.Format("{0}. {1} \n", i, _items[i]);

        return result;
    }

    public void AddItem(Item item)
    {
        _items.Add(item);
        PriceTotalItemes += item.Price;
    }

    public void RemoveItem(int index)
    {
        PriceTotalItemes -= _items[index].Price;
        _items.RemoveAt(index);
    }

    public bool IsEmptyItems()
    {
        return _items.Count <= 0;
    }

}

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

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

    public Item(Item item)
    {
        Name = item.Name;
        Price = item.Price;
    }

    public override string ToString()
    {
        return String.Format("{0} - {1:0.00} ", Name, Price);
    }
}