(function($) {
	$.fn.billboard = function(options) {
		$.fn.billboard.settings = $.extend({}, $.fn.billboard.defaults, options);

		return this.each(function() {
			var context = $(this), settings = $.fn.billboard.settings, scroller = settings.scroller;
			var controller = new $.fn.billboard.controller(settings.scrollingElements);

			$.fn.billboard.init(scroller, context); // Initialize the billboard

			if (settings.arrows) {
					$.each(settings.arrows, function() {
						var arrow = $(this);
						arrow.bind('click', function() {
							if (arrow[0] === settings.arrows.prev[0]) {
								scroller.animate({scrollLeft: scroller.scrollLeft() + controller.prevBoard.position().left}, 300, function() {
									controller.currentBoard = controller.prevBoard;
									controller.prevBoard = controller.getPrevBoard();
									controller.nextBoard = controller.getNextBoard();
									if (settings.navigation) {
										var i = controller.getCurrentNav(settings.scrollingElements);
										settings.navigation.removeClass(settings.activeNavClass);
										settings.navigation.eq(i).addClass(settings.activeNavClass);
									}
								});
							}
							if (arrow[0] === settings.arrows.next[0]) {
								scroller.animate({scrollLeft: scroller.scrollLeft() + controller.nextBoard.position().left}, 300, function() {
									controller.currentBoard = controller.nextBoard;
									controller.prevBoard = controller.getPrevBoard();
									controller.nextBoard = controller.getNextBoard();
									if (settings.navigation) {
										var i = controller.getCurrentNav(settings.scrollingElements);
										settings.navigation.removeClass(settings.activeNavClass);
										settings.navigation.eq(i).addClass(settings.activeNavClass);
									}
								});
							}
							return false;
						});
					});
			}
			if (settings.navigation) {
				settings.navigation.each(function(i) {
					var nav = $(this), selectedBoard;
					nav.bind('click', function() {
						selectedBoard = settings.scrollingElements.eq(i);

						scroller.animate({scrollLeft: scroller.scrollLeft() + selectedBoard.position().left}, 300, function() {
							controller.currentBoard = selectedBoard;
							controller.prevBoard = controller.getPrevBoard();
							controller.nextBoard = controller.getNextBoard();
						});

						settings.navigation.removeClass(settings.activeNavClass);
						nav.addClass(settings.activeNavClass);
						return false;
					});
				});
			}
		});
	};

	$.fn.billboard.init = function(scroller, context) { // Initializes the billboard display
		var settings = $.fn.billboard.settings;
		if (settings.displayType === 'scroll') {
			scroller.css('overflow', 'hidden');
			settings.scrollerWindow.css('width', settings.scrollingElements.width() * settings.scrollingElements.length);
			scroller.scrollLeft(0);
		}
		if (settings.arrows) {
			settings.arrows.prev.css('outline', 'none');
			settings.arrows.next.css('outline', 'none');
			if (settings.hoverForArrows) {
				// Will not fade in navigation if browser is IE
				var animateArrows = jQuery.support.htmlSerialize;
				context.hover(function() {
					if (animateArrows) {
						$.each(settings.arrows, function() {
							var arrow = $(this);
							arrow.show().css('opacity', '0');
							arrow.stop().animate({ opacity: 1 }, 300);
						});
					} else {
						settings.arrows.prev.show();
						settings.arrows.next.show();
					}
				}, function() {
					if (animateArrows) {
						settings.arrows.prev.stop().animate({ opacity: 0 }, 300);
						settings.arrows.next.stop().animate({ opacity: 0 }, 300);
					} else {
						settings.arrows.prev.hide();
						settings.arrows.next.hide();
					}
				});
			} else {
				settings.arrows.prev.show();
				settings.arrows.next.show();
			}
		}
		if (settings.navigation) {
			settings.navigation.first().addClass(settings.activeNavClass);
		}
	};

	$.fn.billboard.controller = function(boards) {
		this.firstBoard = boards.first();
		this.lastBoard = boards.last();
		this.currentBoard = this.firstBoard;
		this.nextBoard = this.currentBoard.next();
		this.prevBoard = this.lastBoard;
	};

	$.fn.billboard.controller.prototype.getNextBoard = function() {
		if (this.currentBoard.next().length !== 0) {
			return this.currentBoard.next();
		} else {
			return this.firstBoard;
		}
	};

	$.fn.billboard.controller.prototype.getPrevBoard = function() {
		if (this.currentBoard.prev().length !== 0) {
			return this.currentBoard.prev();
		} else {
			return this.lastBoard;
		}
	};

	$.fn.billboard.controller.prototype.getCurrentNav = function(boards) {
		var currentBoard = this.currentBoard, eq;
		$.each(boards, function(i, board) {
			if (currentBoard[0] === board) {
				eq = i;
			}
		});
		return eq;
	}
	// default properties
	$.fn.billboard.defaults = {
		activeNavClass:		'active',
		displayType: 		'scroll', // options are fade and scroll
		hoverForArrows: 	false
	};

})(jQuery);