// JavaScript Document
var Playlist = function(instance, playlist, options) {
		var self = this;
		this.instance = instance; // String: To associate specific HTML with this playlist
		this.playlist = playlist; // Array of Objects: The playlist
		this.options = options; // Object: The jPlayer constructor options for this playlist
		this.current = 0;

		this.cssId = {
			jPlayer: "jquery_jplayer_",
			interface: "jp_interface_",
			playlist: "jp_playlist_"
		};
		
		this.cssSelector = {};

		$.each(this.cssId, function(entity, id) {
			self.cssSelector[entity] = "#" + id + self.instance;
		});

		if(!this.options.cssSelectorAncestor) {
			this.options.cssSelectorAncestor = this.cssSelector.interface;
		}

		$(this.cssSelector.jPlayer).jPlayer(this.options);

		$(this.cssSelector.interface + " .jp-previous").click(function() {
			self.playlistPrev();
			$(this).blur();
			return false;
		});

		$(this.cssSelector.interface + " .jp-next").click(function() {
			self.playlistNext();
			$(this).blur();
			return false;
		});
	};

Playlist.prototype = {
	displayPlaylist: function() {
		var self = this;
		$(this.cssSelector.playlist + " ul").empty();
		for (i=0; i < this.playlist.length; i++) {
			var listItem = (i === this.playlist.length-1) ? "<li class='jp-playlist-last'>" : "<li>";
			listItem += "<a href='#' id='" + this.cssId.playlist + this.instance + "_item_" + i +"' tabindex='1'>"+ this.playlist[i].name +"</a>";

			// Create links to free media
			if(this.playlist[i].free) {
				var first = true;
				listItem += "<div class='jp-free-media'>(";
				$.each(this.playlist[i], function(property,value) {
					if($.jPlayer.prototype.format[property]) { // Check property is a media format.
						if(first) {
							first = false;
						} else {
							listItem += " | ";
						}
						listItem += "<a id='" + self.cssId.playlist + self.instance + "_item_" + i + "_" + property + "' href='" + value + "' tabindex='1'>" + property + "</a>";
					}
				});
				listItem += ")</span>";
			}

			listItem += "</li>";

			// Associate playlist items with their media
			$(this.cssSelector.playlist + " ul").append(listItem);
			$(this.cssSelector.playlist + "_item_" + i).data("index", i).click(function() {
				var index = $(this).data("index");
				if(self.current !== index) {
					self.playlistChange(index);
				} else {
					$(self.cssSelector.jPlayer).jPlayer("play");
				}
				$(this).blur();
				return false;
			});

			// Disable free media links to force access via right click
			if(this.playlist[i].free) {
				$.each(this.playlist[i], function(property,value) {
					if($.jPlayer.prototype.format[property]) { // Check property is a media format.
						$(self.cssSelector.playlist + "_item_" + i + "_" + property).data("index", i).click(function() {
							var index = $(this).data("index");
							$(self.cssSelector.playlist + "_item_" + index).click();
							$(this).blur();
							return false;
						});
					}
				});
			}
		}
	},

	playlistInit: function(autoplay) {
		if(autoplay) {
			this.playlistChange(this.current);
		} else {
			this.playlistConfig(this.current);
		}
	},

	playlistConfig: function(index) {
		$(this.cssSelector.playlist + "_item_" + this.current).removeClass("jp-playlist-current").parent().removeClass("jp-playlist-current");
		$(this.cssSelector.playlist + "_item_" + index).addClass("jp-playlist-current").parent().addClass("jp-playlist-current");
		this.current = index;
		$(this.cssSelector.jPlayer).jPlayer("setMedia", this.playlist[this.current]);
	},

	playlistChange: function(index) {
		this.playlistConfig(index);
		$(this.cssSelector.jPlayer).jPlayer("play");
	},

	playlistNext: function() {
		var index = (this.current + 1 < this.playlist.length) ? this.current + 1 : 0;
		this.playlistChange(index);
	},

	playlistPrev: function() {
		var index = (this.current - 1 >= 0) ? this.current - 1 : this.playlist.length - 1;
		this.playlistChange(index);
	}
};