07. Vloggers - SoftUni

using System;
using System.Collections.Generic;
using System.Linq;

namespace _07._The_V_Logger
{
    class Program
    {
        static void Main(string[] args)
        {
            HashSet<Vlogger> vloggers = new HashSet<Vlogger>();

            string input = Console.ReadLine();
            while (input != "Statistics")
            {
                string[] commandParts = input.Split(" ",
                    StringSplitOptions.RemoveEmptyEntries);

                string name = commandParts[0];
                string command = commandParts[1];

                switch (command)
                {
                    case "joined":
                        bool isExists = IsVloggerExists(vloggers, name);
                        if (isExists)
                        {
                            break;
                        }
                        else
                        {
                            vloggers.Add(new Vlogger(name));
                        }
                        break;

                    case "followed":
                        string followed = commandParts[2];
                        bool isVloggerExists = IsVloggerExists(vloggers, name);
                        bool isFollowedExists = IsVloggerExists(vloggers, followed);

                        bool isFollowing = IsFollowing(vloggers, name, followed);

                        if (isVloggerExists
                            && isFollowedExists
                            && name != followed
                            && isFollowing == false)
                        {
                            foreach (var vlogger in vloggers)
                            {
                                if (vlogger.Name == name)
                                {
                                    vlogger.Following.Add(followed);

                                }
                                if (vlogger.Name == followed)
                                {
                                    vlogger.Followers.Add(name);
                                }
                            }
                        }
                        break;
                }

                input = Console.ReadLine();
            }

            Console.WriteLine($"The V-Logger has a total of {vloggers.Count} vloggers in its logs.");
            int counter = 1;
            foreach (var vlogger in vloggers
                .OrderByDescending(vlogger => vlogger.Followers.Count)
                .ThenBy(vlogger => vlogger.Following.Count))
            {
                Console.WriteLine($"{counter}. {vlogger.Name} : " +
                    $"{vlogger.Followers.Count} followers, " +
                    $"{vlogger.Following.Count} following");
                if (counter == 1)
                {
                    foreach (var follower in vlogger.Followers.OrderBy(x => x))
                    {
                        Console.WriteLine($"*  {follower}");
                    }
                }
                counter++;
            }
        }

        private static bool IsFollowing(HashSet<Vlogger> vloggers, string name, string followed)
        {
            foreach (var vlogger in vloggers)
            {
                if (vlogger.Name == name)
                {
                    if (vlogger.Following.Contains(followed))
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        private static bool IsVloggerExists(HashSet<Vlogger> vloggers, string name)
        {
            bool isExists = false;
            foreach (var vlogger in vloggers)
            {
                if (vlogger.Name == name)
                {
                    isExists = true;
                    break;
                }
            }
            return isExists;
        }
    }

    public class Vlogger
    {
        public Vlogger(string name)
        {
            Name = name;
            Followers = new HashSet<string>();
            Following = new HashSet<string>();
        }
        public string Name { get; set; }
        public HashSet<string> Followers { get; set; }
        public HashSet<string> Following { get; set; }
    }
}