//TODO 1:

// - compile below code

// - run it successfuly with 'display-players'

​

//TODO 2:

// - add 'display-teams' command

// command should result in listing all teams - order by the sum of the pointes gathered by players inside the given team

//eg:

//TeamA - 40 points

//TeamB -  9 points

​

//TODO 3:

//Propose refacot addjustments

​

using System;

using System.Collections.Generic;

using Microsoft.Extensions.DependencyInjection;

​

public class Program

{

    public static void Main()

    {

        var services = new ServiceCollection();

        services.AddSingleton<IUserService, InMemoryUserService>();

        services.AddSingleton<IHandler, UsersHandler>();

​

        var serviceProvider = services.BuildServiceProvider();

​

        while (true)

        {

            var command = Console.ReadLine();

​

            if (command == "exit")

            {

                break;

            }

​

            var handlers = serviceProvider.GetServices<IHandler>();

​

            if (handlers.Count() > 0)

            {

                var handler = handlers.FirstOrDefault(it => it.CommandName == command);

​

                if(handler != null)

                {

                    handler.Execute();

                    continue;

                }

​

                Console.WriteLine("'" + command + "' command was unrecognized."); 

            }

        }

    }

}

​

public interface IHandler

{

    void Execute();

​

    string CommandName { get; }

}

​

public class UsersHandler : IHandler

{

    public string CommandName 

    {

        get { return "display-players"; }

    }

​

    public IUserService UserService;

​

    public UsersHandler(IUserService userService)

    {

    }

​

    public void Execute()

    {   

        foreach (var user in UserService.GetUsers())

        {

            Console.WriteLine("User: " + user.Name);

        }

    }

}

​

public class User

{

    public string Name { get; set; }

​

    public int Id;

​

    public int Score;

​

    public string TeamId { get; set; }

}

​

public interface IUserService : IDisposable

{

    IEnumerable<User> GetUsers();

}

​

public class InMemoryUserService : IUserService

{

    public bool IsDisposed;

​

    public IEnumerable<User> GetUsers()

    {

        if (IsDisposed)

        {

            throw new ArgumentException("Service was already disposed.");

        }

​

        List<User> users = new List<User>();

​

        users.Add(new User()

        {

            Id = 1,

            Name = "User1",

            Score = 10,

            TeamId = "TeamA"

        });

​

        users.Add(new User()

        {

            Id = 2,

            Name = "User2",

            Score = 12,

            TeamId = "TeamB"

        });

​

        users.Add(new User()

        {

            Id = 3,

            Name = "User3",

            Score = 12,

            TeamId = "TeamA",

        });

        users.Add(new User()

        {

            Id = 4,

            Name = "User4",

            Score = 2,

            TeamId = "TeamB",

        });

​

        return users;

    }

​

    public void Dispose()

    {

        //Some things that need to be disposed.

        IsDisposed = true;

    }

}