using System;

public class Program {

    public static void Main()

    {

        Game game = new Game();

        game.execute();

    }

}

​

public class Game {

    private ToolHelper toolHelper;

    public void execute() {

        var userInput = this.promptUser();

        if (userInput == 4) {

            Environment.Exit(0);

        }

        else {

            toolHelper = new ToolHelper();

            Tool userTool = toolHelper.determineTool(userInput);

            Tool computerTool = toolHelper.generateRandomTool();

            this.printGameResults(userTool, computerTool);

        }

        Console.ReadLine();

    }

    protected void printGameResults(Tool userTool, Tool computerTool) {

        if (toolHelper.isTie(userTool.name, computerTool.name)) {

                Console.WriteLine(String.Format("User selected {0} and Computer selected {1}. Result is a tie.", userTool.name, computerTool.name));

        }

        else if (userTool.isWinner(computerTool.name)) {

            Console.WriteLine(String.Format("{0} You Win!", userTool.performAction(computerTool.name)));

        }

        else {

            Console.WriteLine(String.Format("{0} You Lose.", computerTool.performAction(userTool.name)));

        }

    }

    protected int promptUser() {

        string rock = "1. Rock";

        string paper = "2. Paper";

        string scissors = "3. Scissors";

        string exit = "4. Exit Game";

        string prompt = String.Format("Pick your weapon {0}{1}{0}{2}{0}{3}{0}{4}{0}",Environment.NewLine, rock, paper, scissors, exit);

        Console.Write(prompt);

        string input = Console.ReadLine();

        int result;

        int.TryParse(input, out result);

        return result;

    }

}

public abstract class Tool {

    public string name {get; set;}

    public string action {get; set;}

    public string performAction(string opposingTool) {

        return String.Format("{0} {1} {2}.", name, action, opposingTool);

    }

    public abstract bool isWinner(string name);

}

public class Rock : Tool {

    public Rock() {

        name = "Rock";

        action = "smashes";

    }

    public override bool isWinner(string name) {

        bool result = false;

        switch(name) {

            case "Paper":

                result = false;

                break;

            case "Scissors":

                result = true;

                break;

            default:;

                break;

        }

        return result;

    }

}

public class Scissors : Tool {

    public Scissors() {

        name = "Scissors";

        action = "cuts";

    }

    public override bool isWinner(string name) {

        bool result = false;

        switch(name) {

            case "Rock":

                result = false;

                break;

            case "Paper":

                result = true;

                break;

            default:

                break;

        }

        return result;

    }

}

public class Paper : Tool {

    public Paper() {

        name = "Paper";

        action = "smothers";

    }

    public override bool isWinner(string name) {

        bool result = false;

        switch(name) {

            case "Rock":

                result = true;

                break;

            case "Scissors":

                result = false;

                break;

            default:

                break;

        }

        return result;

    }

}

public class ToolHelper {

    public Tool determineTool(int input) {

        Tool tool;

        switch(input) {

            case 1:

                tool = new Rock();

                break;

            case 2:

                tool = new Paper();

                break;

            case 3:

                tool = new Scissors();

                break;

            default:

                tool = null;

                break;

        }

        return tool;

    }

    public Tool generateRandomTool() {

        Random random = new Random();

        int randomNumber = random.Next(1, 4);

        return this.determineTool(randomNumber);

    }

    public bool isTie(string user, string computer) {

        return user == computer;

    }

}