import java.util.Comparator;

/**
 * This class represents the data contained within a single song.
 * A comparator can be provided to each Song as the basis for it's compareTo,
 * otherwise songs will be ordered by their title.
 */
public class Song implements Comparable<Song> {

    // fields
    
    private String title;
    private String artist;
    private String genres;
    private int year;
    private int bpm;
    private int energy;
    private int danceability;
    private int loudness;
    private int liveness;
    private Comparator<Song> comparator;
    
    // constructors
    
    public Song(String title,
                String artist,
                String genre,
                int year, // how old vs recent this song is
                int bpm, // speed of song
                int energy,
                int danceability,
                int loudness,
                int liveness,
                Comparator<Song> comparator) {
        this.title = title;
        this.artist = artist;
        this.genres = genres;
        this.year = year;
        this.bpm = bpm;
        this.energy = energy;
        this.danceability = danceability;
        this.loudness = loudness;
        this.liveness = liveness;
        this.comparator = comparator;
    }
    
    public Song(String title,
                String artist,
                String genre,
                int year, // how old vs recent this song is
                int bpm, // speed of song
                int energy,
                int danceability,
                int loudness,
                int liveness) { // no comparator, defaults to null
        this(title,
             artist,
             genre,
             year,
             bpm,
             energy,
             danceability,
             loudness,
             liveness,
             null);
    }

    // accessors
    
    public String getTitle() { return title; } 
    public String getArtist() { return artist; } 
    public String getGenres() { return genres; } 
    public int getYear() { return year; } 
    public int getBPM() { return bpm; } 
    public int getEnergy() { return energy; } 
    public int getDanceability() { return danceability; } 
    public int getLoudness() { return loudness; } 
    public int getLiveness() { return liveness; }

    // comparisons are made using the Comparator pass to constructor
    
    public int compareTo(Song other) {
        if(this.comparator != null)
            return this.comparator.compare(this,other);
        else
            return this.title.compareTo(other.title);
    }
}