using System;
using System.Collections.Generic;
class Program
{
    static void Main(string[] args)
    {
        const string ShowInventorySellerCommand = "1";
        const string BuyProductCommand = "2";
        const string ShowInventoryPlayerCommand = "3";
        const string IsExitCommand = "4";

        string userInput;
        bool isWorking = true;

        Seller seller = new Seller();
        Player player = new Player();

        while(isWorking)
        {
            Console.Clear();
            Console.WriteLine("Вы зашли в лавку торговца.");
            Console.WriteLine($"{ShowInventorySellerCommand})Посмотреть товар.\n{BuyProductCommand})Купить товар.\n" +
                $"{ShowInventoryPlayerCommand})Посмотреть свой инвентарь.\n{IsExitCommand})Покинуть лавку.");
            userInput = Console.ReadLine();
            Console.Clear();

            switch (userInput)
            {
                case ShowInventorySellerCommand:
                    seller.ShowInventory();
                    break;

                case BuyProductCommand:
                    player.BuyProduct(seller.SellProduct());
                    break;

                case ShowInventoryPlayerCommand:
                    player.ShowInventory();
                    break;

                case IsExitCommand:
                    isWorking = false;
                    break;
            }
        }
    }
}

class Human
{
    protected List<Product> Products = new List<Product>();

    public void ShowInventory()
    {
        foreach (Product product in Products)
        {
            Console.WriteLine($"Название:{product.Name}|Цена:{product.Price}|Урон:{product.Damage}|Прочность:{product.Endurance}");
        }

        Console.ReadKey();
    }
}

class Seller : Human
{
    private Product _product;

    public Seller()
    {
        Products.AddRange(new List<Product>() { new Product("WoodKnife", 5, 25, 100), new Product("IronKnife", 15, 50, 150), new Product("GoldKnife", 30, 100, 25) });
    }
    public Product SellProduct()
    {
        Product product = null;

        if (Products.Count <= 0)
        {
            Console.WriteLine("У торговца закончился товар.");
            Console.ReadKey();
        }
        else
        {
            Console.WriteLine("Что бы вы хотели купить?");
            string userInput = Console.ReadLine();

            if (IsAvailable(userInput))
            {
                foreach (var item in Products)
                {
                    if (item.Name == userInput)
                    {
                        product = item;
                        break;
                    }
                }
            }
        }

        Products.Remove(product);

        return product;
    }

    public bool IsAvailable(string productName)
    {
        foreach (var product in Products)
        {
            if (product.Name == productName)
            {
                return true;
                break;
            }
        }

        Console.WriteLine("Такого товара нет в наличии!");
        Console.ReadKey();

        return false;
    }
}

class Player : Human
{
    public void BuyProduct(Product product)
    {
        if (product != null)
        {
            Products.Add(product);
        }
    }
}


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

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