Local Development Environments - Refactoring

package com.teamtreehouse;

import com.teamtreehouse.model.SongBook;
import com.teamtreehouse.model.Song;

import java.io.InputStreamReader;
import java.io.IOException;
import java.io.BufferedReader;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.List;
import java.util.HashMap;
import java.util.Map;
import java.util.Queue;

public class KaraokeMachine {
  private SongBook mSongBook;
  private BufferedReader mReader;
  private Map<String, String> mMenu;
  private Queue<Song> mSongRequestQueue;

  public KaraokeMachine(SongBook songBook) {
    mSongBook = songBook;
    mReader = new BufferedReader(new InputStreamReader(System.in));
    mSongRequestQueue = new ArrayDeque<Song>();
    mMenu = new HashMap<String, String>();
    mMenu.put("add", "Add a new song to the song book");
    mMenu.put("choose", "Choose a song to sing!");
    mMenu.put("play", "Play next song in the queue");
    mMenu.put("quit", "Give up. Exit the program.");
  }

  private String promptAction() throws IOException { 
    System.out.printf("There are %d songs available and %d in the queue. Your options are: %n",
                      mSongBook.getSongCount(),
                      mSongRequestQueue.size());
    for (Map.Entry<String, String> option : mMenu.entrySet()) {
      System.out.printf("%s - %s %n", 
                        option.getKey(), 
                        option.getValue());
    }
    System.out.printf("What do you want to do:  ");
    String choice = mReader.readLine();
    return choice.trim().toLowerCase();
  }

  public void run () {
    String choice ="";
    do {
      try {
        choice = promptAction();
        switch(choice) {
          case "add":
            Song song = promptNewSong();
            mSongBook.addSong(song);
            System.out.printf("%s added! %n%n", song);
               //TODO: Add a new song
            break;
          case "play":
            playNext();
          case "choose":
            String artist = promptArtist();
            Song artistSong = promptSongForArtist(artist);
            mSongRequestQueue.add(artistSong);
          //TODO: Add to a song queue
            System.out.printf("You chose: %s %n", artistSong);
            break;
          case "quit":
            System.out.println("Thanks for playing!");
            break;
          default:
            System.out.printf("Unknown choice: '%s'. Try again. %n%n%n", 
                              choice);
        }
      } catch(IOException ioe) {
        System.out.println("Problem with input");
        ioe.printStackTrace();
      }                            
    } while(!choice.equals("quit"));
    }

  private Song promptNewSong() throws IOException {
      System.out.print("Enter the artist's name: ");
      String artist = mReader.readLine();
      System.out.print("Enter the title: ");
      String title = mReader.readLine();
      System.out.print("Enter the video URL: ");
      String videoUrl = mReader.readLine();
      return new Song(artist, title, videoUrl);
    }

  private String promptArtist() throws IOException {
    System.out.println("Available artists:");
    List<String> artists = new ArrayList<>(mSongBook.getArtists());
    int index = promptForIndex(artists);
    return artists.get(index);

  } 

  private Song promptSongForArtist(String artist) throws IOException {
    List<Song> songs = mSongBook.getSongForArtist(artist);
    List<String> songTitles = new ArrayList<>();
    for (Song song : songs) {
      songTitles.add(song.getTitle());
    }
    System.out.printf("Available songs for %s %n", artist);
    int index = promptForIndex(songTitles);
    return songs.get(index);
  }


  private int promptForIndex(List<String> options) throws IOException {
      int counter = 1;
      for (String option : options) {
        System.out.printf("%d.) %s %n", counter, option);
        counter++;
      }
      System.out.print("Your choice:  ");
      String optionAsString = mReader.readLine();
      int choice = Integer.parseInt(optionAsString.trim());
      return choice -1;
    }

   public void playNext() {
     Song song = mSongRequestQueue.poll();
     if (song == null) {
       System.out.println("Sorry there are no songs in the queue." + 
                          "  Use choose from the menu to add some");
     } else {
       System.out.printf("%n%n%n open %s to hear %s by %s %n%n%n",
                         song.getVideoUrl(),
                         song.getTitle(),
                         song.getArtist());
     }
   }

  }