Shop

using System;
using System.Collections.Generic;

namespace Classes
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Administrator administrator = new Administrator();
            Seller seller = new Seller();
            Customer customer = new Customer();
            administrator.Shop(seller, customer);
        }
    }

    class Administrator
    {
        public void Shop(Seller seller, Customer customer)
        {
            const int CommandExit = 0;

            bool isRunning = true;

            while (isRunning)
            {
                Console.Clear();

                Console.Write("Sellers wallet: ");
                seller.ShowMoney();

                int rightCursorPosition = 0;
                Console.WriteLine("Sellers cart: ");
                seller.ShowCart(ConsoleColor.Red, rightCursorPosition);

                int leftCursorPosition = 25;
                Console.SetCursorPosition(leftCursorPosition, 0);
                Console.Write("Customers wallet: ");
                customer.ShowMoney();

                Console.SetCursorPosition(leftCursorPosition, 1);
                Console.WriteLine("Customers cart: ");
                customer.ShowCart(ConsoleColor.Green, leftCursorPosition);

                Console.SetCursorPosition(rightCursorPosition, 15);
                Console.Write("Enter a number to buy or 0 to exit\n" +
                    "Enter the item number you want to buy: ");

                int.TryParse(Console.ReadLine(), out int userInput);

                if (userInput == CommandExit)
                {
                    isRunning = false;
                }
                else if (0 < userInput && userInput <= seller.Count)
                {
                    if (customer.BuyItem(seller.GetItem(userInput - 1)))
                    {
                        seller.SellItem(userInput - 1);
                    }
                    else
                    {
                        Console.ForegroundColor = ConsoleColor.Red;
                        Console.WriteLine("not enough money!");
                        Console.ResetColor();
                        Console.ReadKey();
                    }
                }
            }
        }
    }

    class Person
    {
        protected List<Product> Cart = new List<Product>();
        protected int Money;

        protected Random random = new Random();

        public void ShowCart(ConsoleColor consoleColor, int leftCursorPosition)
        {
            int topCursorPosition = 2;
            int number = 1;

            foreach (Product product in Cart)
            {
                Console.ForegroundColor = consoleColor;
                Console.SetCursorPosition(leftCursorPosition, topCursorPosition++);
                Console.WriteLine(number++ + " - " + product.Name + " - price " + product.Price);
                Console.ResetColor();
            }
        }

        public void ShowMoney()
        {
            Console.WriteLine(Money);
        }
    }

    class Seller : Person
    {
        public Seller()
        {
            FillCart();
            Money = 0;
        }

        private void FillCart()
        {
            int productCount = 10;
            int minPrice = 10;
            int maxPrice = 20;

            for (int i = 0; i < productCount; i++)
            {
                Cart.Add(new Product("Item " + (i + 1), random.Next(minPrice, maxPrice)));
            }
        }

        public int Count => Cart.Count;

        public Product GetItem(int itemNumber)
        {
            Product item = Cart[itemNumber];
            return item;
        }

        public void SellItem(int itemNumber)
        {
            Money += Cart[itemNumber].Price;
            Cart.RemoveAt(itemNumber);
        }
    }

    class Customer : Person
    {
        public Customer()
        {
            FillWallet();
        }

        private void FillWallet()
        {
            int maxWalletValue = 200;
            Money = random.Next(maxWalletValue);
        }

        public bool BuyItem(Product item)
        {
            if (Money >= item.Price)
            {
                Cart.Add(new Product(item.Name, item.Price));
                Money -= item.Price;
                return true;
            }
            else
            {
                return false;
            }
        }
    }

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

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