SongsQueue

using System;
using System.Collections.Generic;

namespace SongsQueue
{
    class Program
    {
        static void Main(string[] args)
        {
            //Read a sequence of strings, separated by a comma and a white space
            string[] songs = Console.ReadLine()
                                    .Split(", ", StringSplitOptions.RemoveEmptyEntries);

            //Create a song's queue
            Queue<string> playList = new Queue<string>();

            //Add songs in playlist
            foreach (string song in songs)
            {
                playList.Enqueue(song);
            }

            //While receiving the commands, print the proper messages described above
            while (true)
            {
                if (playList.Count == 0)
                {
                    Console.WriteLine($"No more songs!");
                    break;
                }

                //Read a command from the console
                string command = Console.ReadLine();

                if (command == "Play")
                {
                    //plays a song (removes it from the queue)
                    playList.Dequeue();
                }
                else if (command == "Show")
                {
                    //prints all songs in the queue separated by a comma and a white space
                    Console.WriteLine(String.Join(", ", playList));
                }
                else //(Add)
                {
                    //Find the index of the first white space in the command
                    int index = command.IndexOf(' ');

                    //Get substring after the index of white space
                    string song = command.Substring(index + 1);

                    if (playList.Contains(song))
                    {
                        //if the song is already in the queue, skip the command
                        Console.WriteLine($"{song} is already contained!");
                    }
                    else
                    {
                        //adds the song to the queue if it isn’t contained already
                        playList.Enqueue(song);
                    }
                }
            }
        }
    }
}