function solve() {
	class Playable {
		constructor(title, author) {
			this.id = Math.random() * 100;
			this.title = title;
			this.author = author;
		}
		get title(){
			return this._title;
		}
		set title(value){
			this._title = value;
		}

		get author(){
			return this._author;
		}
		set author(value){
			this._author = value;
		}

		play(){
			return "[" + this.id.toString() + "]." + " " +"[" + this.title.toString() +"]" + " - " +"[" + this.author.toString()+"]";
		}
	}

	class Audio extends Playable {
		constructor(title, author, length) {
			super(title, author);
			this.length = length;
		}
		get length(){
			return this._length;
		}
		set length(value){
			if (value <= 0){
				throw "Length lower or equal to 0"
			}
			this._length = value
		}
		play(){
			return super.play() +" - ["+this.length.toString()+"]"
		}
	}
	class Video extends Playable {
		constructor(title, author, imdbRating){
			super(title , author);
			this.imdbRating = imdbRating;
		}
		get imdbRating(){
			return this._imdbRating;
		}
		set imdbRating(value){
			if(value <1 || value >5){
				throw	'Value is under 1 or above 5'
			}
			this._imdbRating = value;
		}
		play(){
			return super.play() + " - ["+this.imdbRating.toString()+"]";
		}
	}
	const module = {
		getPlayer: function (name){
			// returns a new player instance with the provided name
		},
		getPlaylist: function(name){
			//returns a new playlist instance with the provided name
		},
		getAudio: function(title, author, length){
			//returns a new audio instance with the provided title, author and lengthu
			return new Audio(title, author, length);
		},
		getVideo: function(title, author, imdbRating){
			//returns a new video instance with the provided title, author and imdbRating
			return new Video(title, author , imdbRating);
		},
	};

	class Playlist {
		constructor(name) {
			this.id = Math.random() * 100;
			this.name = name;
			this.playlist = [];
		}
		get name(){
			return this._name;
		}
		set name(value){
			this._name = value;
		}
		addPlayable(playable){
			this.playlist.push(playable);
			return this;
		}
	}

	return module;
}

let p = solve().getVideo("kniga za djunglata", "liliIvanova", 2);
console.log(p.play());
console.log(p);
module.exports = solve;