/****************************************************************************

Accessible News Slider

https://github.com/rip747/Yahoo-style-news-slider-for-jQuery



Authors:

Brian Reindel

http://blog.reindel.com



Andrea Ferracani

http://www.micc.unifi.it/ferracani



Maintainer:

Anthony Petruzzi

http://rip747.github.com/



License:

Unrestricted. This script is free for both personal and commercial use.

*****************************************************************************/

(function( $ ){

	$.fn.accessNews = function(settings){

	

		var defaults = {

			// title for the display

			title: "",

			// subtitle for the display

			subtitle: "",

			// number of slides to advance when paginating

			slideBy: 4,

			// the speed for the pagination

			speed: "normal",

			// slideshow interval

			slideShowInterval: 5000,

			// delay before slide show begins

			slideShowDelay: 5000,

			// theme

			theme: "default",

			// allow the pagination to wrap continuously instead of stopping when the beginning or end is reached 

			continuousPaging : true,

			// selector for the story title

			contentTitle: "h3",

			// selector for the story subtitle

			contentSubTitle: "abbr",

			// selector for the story description

			contentDescription: "p",

			// function to call when the slider first initializes

			onLoad: null,

			// function to call when the slider is done being created

			onComplete: null

		};

		

		return this.each(function(){

			

			settings = jQuery.extend(defaults, settings);

			var _this = jQuery(this);

			var stories = _this.children();

			var intervalId;

			var _storyIndictor;

			var _storyIndictors;

			

			var container = {

				_wrapper: "<div class=\"jqans-wrapper " + settings.theme + "\"></div>",

				_container: "<div class=\"jqans-container\"></div>",

				_headline: jQuery("<div class='jqans-headline'></div>").html(["<p><strong>", settings.title, "</strong> ", settings.subtitle, "</p>"].join("")),

				_content: jQuery("<div class='jqans-content'></div>"),

				_stories: "<div class=\"jqans-stories\"></div>",

				_first: jQuery(stories[0]),

				

				init: function(){

				

					if (settings.onLoad)

					{

						settings.onLoad.call($(this));

					}

				

					// wrap the ul with our div class and assigned theme

					_this.wrap(this._wrapper);

					// our container where we show the image and news item

					_this.before(this._container);

					// set the width of the container

					var width = (stories.length * this._first.outerWidth(true));

					_this.css("width", width);



					if (settings.title.length)

					{

						this.append(this._headline);

					}

					this.append(this._content);

					

					// create the selector indictor

					this.selector(width);

					

					this.set(0);

					

					// pagination setup

					pagination.init();

					

					// slideshow setup

					slideshow.init();

					

					_this.wrap(this._stories);

					

					if (settings.onComplete)

					{

						settings.onComplete.call($(this));

					}



				},

				

				selector: function(width){

					var s = "";

					for(var i = 1; i <= stories.length; i++){

						s += "<li><div/></li>";

					}

					var o = jQuery("<div class=\"jqans-stories-selector\"></div>");

					o.append("<ul>"+ s +"</ul>");

					_storyIndictor = jQuery(o.find("ul"));

					_storyIndictors = _storyIndictor.children();

					o.css("width", width);

					_this.before(o);

				},

				

				append: function(content){

					this.get().append(content);

				},

				

				// returns the main container

				get: function(){

					return _this.parents("div.jqans-wrapper").find('div.jqans-container');

				},

				

		set: function(position){

var container = this.get();

var story = jQuery(stories[position]);

var storyIndictor = jQuery(_storyIndictors[position]);

var _content = jQuery("div.jqans-content", container);

var img = jQuery('<img  width="420" height="154"></img>');

var para = jQuery('<div></div>');

var title = jQuery(settings.contentTitle + " a", story).attr('title') || jQuery(settings.contentTitle, story).text();

img.attr('src', jQuery('img', story).attr('longdesc') || jQuery('img', story).attr('src'));

para.html("<h1><a href='" + jQuery('a', story).attr('href') + "' rel='nofollow'>" + title + "</a></h1>" + "<p>" + jQuery(settings.contentDescription, story).html() + "</p>");

var imgWrapper = jQuery("<a href='" + jQuery('a', story).attr('href') + "'/>");

imgWrapper.append(img);

_content.empty();

_content.append(imgWrapper);

_content.append(para);

stories.removeClass('selected');

story.addClass('selected');

_storyIndictors.removeClass('selected');

storyIndictor.addClass('selected');

}

				

			};

			

			var pagination = {

			

				loaded: false,

				_animating: false,

				_totalPages: 0,

				_currentPage: 1,

				_storyWidth: 0,

				_slideByWidth: 0,



				init: function(){

					if (stories.length > settings.slideBy) {

						this._totalPages = Math.ceil(stories.length / settings.slideBy);

						this._storyWidth = jQuery(stories[0]).outerWidth(true);

						this._slideByWidth = this._storyWidth * settings.slideBy;

						this.draw();

						this.loaded = true;

					}

				},

				

				draw: function(){

				

					var _viewAll = jQuery("<div class=\"jqans-pagination\"></div>").html(["<div class=\"jqans-pagination-controls\"><span class=\"jqans-pagination-controls-back\"><a href=\"#\" title=\"Back\">&lt;&lt; Back</a></span><span class=\"jqans-pagination-controls-next\"><a href=\"#\" title=\"Next\">Next &gt;&gt;</a></span></div>"].join(""));

					_this.after(_viewAll);

					

					var _next = jQuery(".jqans-pagination-controls-next > a", _viewAll);

					var _back = jQuery(".jqans-pagination-controls-back > a", _viewAll);

					

					_next.click(function(){

						

						var page = pagination._currentPage + 1;

						pagination.to(page);

						return false;

						

					});

					

					_back.click(function(){

						

						var page = pagination._currentPage - 1;

						pagination.to(page);

						return false;

						

					});



				},

				

				to: function(page){



					if(this._animating){

						return;

					}

					

					// we're animating! 

					this._animating = true;

					

					var viewAll = _this.parent("div").next(".jqans-pagination");

					var startAt = jQuery(".jqans-pagination-count-start", viewAll);

					var endAt = jQuery(".jqans-pagination-count-end", viewAll);

					

					if(page > this._totalPages)

					{

						page =  settings.continuousPaging ? 1 : this._totalPages;

					}

					

					if (page < 1)

					{

						page =  settings.continuousPaging ? this._totalPages : 1;

					}



					var _startAt = (page * settings.slideBy) - settings.slideBy;

					var _endAt = (page * settings.slideBy);

					if (_endAt > stories.length)

					{

						_endAt = stories.length;

					}

					var _left = parseInt(_this.css("left"));

					var _offset = (page * this._slideByWidth) - this._slideByWidth; 

					startAt.html(_startAt + 1);

					endAt.html(_endAt);

					

					_left = (_offset * -1);

						

					_this.animate({

						left: _left

					}, settings.speed);

					

					_storyIndictor.animate({

						left: _left

					}, settings.speed);

					

					// when paginating set the active story to the first

					// story on the page

					container.set(_startAt);



					this._currentPage = page;

					

					// no more animating :(

					this._animating = false;

						

				}



			};

			

			var slideshow = {

				

				init: function(){

					this.attach();

					this.off();

					intervalId = setTimeout(function(){

						slideshow.on();

					}, settings.slideShowDelay);

				},

				

				on: function(){

					this.off();

					intervalId = setInterval(function(){

						slideshow.slide();

					}, settings.slideShowInterval);

				},

				

				off: function(){

					clearInterval(intervalId);

				},

				

				slide: function(){

				

					//currently selected story

					var current = jQuery("li.selected", _this);

					// the next story 

					var next = current.next("li");

					// page number

					var page = 0;

					

					if (!next.length)

					{

						next = jQuery(stories[0]);

						page = 1;

					}

					

					var storyIndex = stories.index(next);

					

					if (pagination.loaded) {



						var storyMod = (storyIndex) % settings.slideBy;

						

						if (storyMod === 0) {

							page = (Math.ceil(storyIndex / settings.slideBy)) + 1;

						}

						

						if (page > 0) {

							pagination.to(page);

						}

					}

					

					container.set(storyIndex);

					

				},

				

				attach: function(){

					

					var that = jQuery(_this).parent("div.jqans-wrapper");

					that.hover(function(){

						// pause the slideshow on hover

						slideshow.off();

					}, function (){

						// resume slideshow on mouseout

						slideshow.on();

					});

					

				}

				

			};

			

			//setup the container

			container.init();

			// append hover every to each element to update container content

			stories.hover(function(){

				// set container contect to hovered li

				container.set(stories.index(this));

			}, function(){

				// do nothing

			});



		});

	};

})( jQuery );