using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var ui = new UserInterface();

        var game = new SimpleGame(ui);

        game.Play();

    }

}

​

class SimpleGame

{

    private UserInterface _ui;

    private List<string> _inventory; // Player's inventory (uses a list)

    private string[] _chest; // Chest items (uses an array)

    public SimpleGame(UserInterface ui)

    {

        _ui = ui;

        _inventory = new List<string>();

        _chest = new string[] { "Gold", "Sword", "Potion" }; // Fixed array of items in the chest

    }

​

    public void Play()

    {

        _ui.Send("Welcome to the Treasure Hunt!");

        bool isPlaying = true;

​

        while (isPlaying)

        {

            _ui.Send("\nWhat would you like to do?");

            _ui.Send("1. View Chest");

            _ui.Send("2. Take Item");

            _ui.Send("3. View Inventory");

            _ui.Send("4. Exit");

​

            string choice = _ui.RequestString("> ");

​

            switch (choice)

            {

                case "1":

                    ViewChest();

                    break;

                case "2":

                    TakeItem();

                    break;

                case "3":

                    ViewInventory();

                    break;

                case "4":

                    _ui.Send("Thanks for playing!");

                    isPlaying = false;

                    break;

                default:

                    _ui.Send("Invalid choice. Please select 1, 2, 3, or 4.");

                    break;

            }

        }

    }

​

    private void ViewChest()

    {

        _ui.Send("\nThe chest contains:");

        for (int i = 0; i < _chest.Length; i++) // Loop through the array

        {

            _ui.Send($"- {_chest[i]}");

        }

    }

​

    private void TakeItem()

    {

        _ui.Send("\nWhich item would you like to take?");

        for (int i = 0; i < _chest.Length; i++) // Display chest items

        {

            _ui.Send($"{i + 1}. {_chest[i]}");

        }       

​

        string choice = _ui.RequestString("> ");

        if (int.TryParse(choice, out int index) && index > 0 && index <= _chest.Length)

        {

            string item = _chest[index - 1];

            _inventory.Add(item); // Add item to the list

            _ui.Send($"You took the {item}.");

        }

        else

        {

            _ui.Send("Invalid choice. Please select a valid item number.");

        }

    }

​

    private void ViewInventory()

    {

        _ui.Send("\nYour inventory contains:");

        if (_inventory.Count == 0)

        {

            _ui.Send("Your inventory is empty.");

        }

        else

        {

            foreach (string item in _inventory) // Loop through the list

            {

                _ui.Send($"- {item}");

            }

        }

    }

}

​

class UserInterface

{

​

    public void Send(string message)

    {

        Console.WriteLine(message);

    }

​

    public string RequestString(string message)

    {

        Console.Write(message);

        return Console.ReadLine();

    }

}

​