task30

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        Shop shop = new Shop(400.0f);
        bool isTrading = true;
        string choose;

        while (isTrading)
        {
            Console.WriteLine("\nChoose an option : ");
            Console.WriteLine("0. Show items of Trader.");
            Console.WriteLine("1. Show items of Player.");
            Console.WriteLine("2. Trade an item.");
            Console.WriteLine("3. Exit.");
            choose = Console.ReadLine();

            switch (choose)
            {
                case "0":
                    shop.ShowTraderItems();
                    break;
                case "1":
                    shop.ShowPlayerItems();
                    break;
                case "2":
                    shop.TryTrade();
                    break;
                case "3":
                    isTrading = false;
                    break;
                default:
                    break;
            }
        }
    }
}

public class Shop
{
    private Player _player;
    private Trader _trader;

    public Shop(float wallet = 50.0f)
    {
        _player = new Player(wallet);
        _trader = new Trader();
        CreateItems();
    }

    public void TryTrade()
    {
        if (_trader.ItemsCount != 0)
        {
            int id = GetId();
            Item item = _trader.GetItem(id);

            if (_player.Wallet - item.Prize > 0)
            {
                _trader.RemoveItem(id);
                _player.AddItem(item);
                Console.WriteLine("Item sold");
            }
            else
            {
                Console.WriteLine("You cann't buy this item");
            }
            return;
        }

        Console.WriteLine("\nAll items sold out.");
    }

    public void ShowPlayerItems()
    {
        _player.ShowList();
    }

    public void ShowTraderItems()
    {
        _trader.ShowList();
    }

    private void CreateItems()
    {
        Random random = new Random();
        float coinsPerRubel = 100;
        int prizeMinimum = 50;
        int prizeMaximum = 10000;
        int itemsAmountDefault = 7;
        string[] names =
        {
        "Axe", "Sword", "Shield", "Bow"
        };

        float prize;
        string name;
        Item item;

        for (int i = 0; i < itemsAmountDefault; ++i)
        {
            prize = random.Next(prizeMinimum, prizeMaximum) / coinsPerRubel;
            name = names[random.Next(0, names.Length)];
            item = new Item(name, prize);
            _trader.AddItem(item);
        }
    }

    private int GetId()
    {
        int id = 0;
        bool isParse = false;
        bool isInRange = false;
        do
        {
            Console.WriteLine("\nInput id of item:");
            isParse = int.TryParse(Console.ReadLine(), out id);
            isInRange = _trader.SearchElement(id);

            if (isParse != true)
                Console.WriteLine("Cannot read input number.");
            if (isInRange != true)
                Console.WriteLine("Id number is out of index.");
        }
        while (isParse != true || isInRange != true);

        return id;
    }
}

public class Item
{
    public string Name { get; private set; }
    public float Prize { get; private set; }

    public Item(string name, float prize)
    {
        Name = name;
        Prize = prize;
    }

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

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

public class Person
{
    protected List<Item> Items;

    public int ItemsCount => Items.Count;

    public float Wallet { get; protected set; }

    protected Person()
    {
        Items = new List<Item>();
    }

    public bool SearchElement(int index)
    {
        return index >= 0 && index < Items.Count;
    }

    public Item GetItem(int index)
    {
        return Items[index];
    }

    public void RemoveItem(int index)
    {
        if (SearchElement(index))
        {
            IncreaseWallet(Items[index].Prize);
            Items.RemoveAt(index);
        }
    }

    public virtual void ShowList()
    {
        Console.WriteLine();
        for (int i = 0; i < Items.Count; ++i)
            Console.WriteLine($"{i} - {Items[i]}");
    }

    public void DecreaseWallet(float prize)
    {
        Wallet -= prize;
    }

    public void IncreaseWallet(float prize)
    {
        Wallet += prize;
    }
}

public class Player : Person
{
    public Player(float wallet = 50.0f) : base()
    {
        Wallet = wallet;
    }

    public override void ShowList()
    {
        Console.WriteLine($"\nYour wallet is : {Wallet:0.00}");
        base.ShowList();
    }

    public void AddItem(Item item)
    {
        DecreaseWallet(item.Prize);
        Items.Add(item);
    }

    public override string ToString()
    {
        return "I'm player";
    }
}

public class Trader : Person
{
    public Trader() : base() { }

    public void AddItem(Item item)
    {
        Items.Add(item);
    }

    public override string ToString()
    {
        return "I'm trader";
    }
}