/*
* jwSlider v1 - http://www.jeffrey-way.com
* Last Updated: October 29, 2009

* This is a very simple and convenient slider/fader to transition between images or content. it offers only fade and slide transitions to keep the script
* as lightweight as possible.

* Developed by Jeffrey Way
* http://www.jeffrey-way.com
* jeffrey@effrey-way.com
*/


(function($) {
	
	$.fn.jwSlider = function(options) {

		// set default options
		var defaults = {
			speed : 1000,
			pause : 2000,
			transition : 'fade',
			context_key : false,
			context_active_class : false,
			force_equal_height : false,
			z_index: 500
		},

		// Take the options that the user selects, and merge them with defaults.
		options = $.extend(defaults, options);
		
		// Needed to fix a tiny bug. If the pause is less than speed, it'll cause a flickr.
		// This will check for that, and if it is smaller, it increases it to just about the options.speed.
		if(options.pause <= options.speed) options.pause = options.speed + 100;
	
		// for each item in the wrapped set
		return this.each(function() {
		
			// cache "this."
			var $this = $(this);
			
			
			
			// Set the width to a really high number. Adjusting the "left" css values, so need to set positioning.
			
			/*if(options.transition === 'fade')
				// no need to set huge width for fade transition
				$this.css({
					'position' : 'relative',
					'padding' : 0
				});*/
				
			if(options.transition === 'slide')
			{
				// Wrap "this" in a div with a class of "slider-wrap."
				$this.wrap('<div class="slider-wrap" />');
			
				$this.css({
					'width' : '99999px',
					'position' : 'relative',
					'padding' : 0
				});
			}
						
			// store an index number for each image item
			$this.children().each(function(i){
				$(this).data('index', i)
			})
						
			// If the user chose the "slide" transition...
			if(options.transition === 'slide') {
				$this.children().css({
					'float' : 'left',
					'list-style' : 'none'
				});
				
				$('.slider-wrap').css({
					'width' : $this.children().width(),
					'overflow' : 'hidden'
				});	
				
				if(options.force_equal_height)
				{
					equal_child_height($this);
				}
				// call the "slide" transition, call the slide function.
				slide();			
			}
			
			// If the user chose the "fade" transition, instead pile all of the images on top of each other.
			if(options.transition === 'fade') {
				$this.children().css({
					'width' : $this.children().width(),
					'position' : 'absolute',
					'left' : 0
				});
				
				// reorder elements to fix z-index issue.
				
				for(var i = $this.children().length, y = 0; i > 0; i--, y++) { 		
					$this.children().eq(y).css('zIndex', i + options.z_index);
				}
				
				if(options.force_equal_height)
				{
					equal_child_height($this);
				}
				
				// Call the fade function. 
				fade();
			}
			
			
				
			
			
			function slide() {
				setInterval(function() {
					// Animate to the left the width of the image/div
					$this.animate({'left' : '-' + $this.parent().width()}, options.speed, function() {
						// Return the "left" CSS back to 0, and append the first child to the very end of the list.
						$this
						   .css('left', 0)
						   .children(':first')
						   .appendTo($this); // move it to the end of the line.
						
						set_context($this);
												
					})
				}, options.pause);
			} // end slide

			function fade() {
			
				setInterval(function() {
					$this.children(':first').animate({'opacity' : 0}, options.speed, function() {	
						$this
						   .children(':first')
						   .css('opacity', 1) // Return opacity back to 1 for next time.
						   .css('zIndex', $this.children(':last').css('zIndex') - 1) // Reduces zIndex by 1 so that it's no longer on top.					
						   .appendTo($this); // move it to the end of the line.
						
						set_context($this);
					})
					
				}, options.pause);
			} // end fade
			
			function highest_element(elements){
				
				var t=0;
				var t_elem;
				$(elements).each(function () {
				    if ($(this).outerHeight() > t ) {
				        t = $(this).outerHeight();
				    }
				});				
				return t;
			}
			
			function equal_child_height(element)
			{
				// set the height of each child to the highest child element
				// stops tall children becoming visable from behind 
				var height = highest_element(element.children());
				
				element.children().css('height', height);
				
				element.css('height', height);
			}
			
			function set_context(element)
			{
				if(options.context_key)
				{
					//  remove context active class from nav item
					$("."+options.context_active_class).removeClass(options.context_active_class);
					
					var n = element.children(':first').data('index') + 1;
					
					// set context nav item to active
					$(options.context_key+'::nth-child('+n+')').addClass(options.context_active_class);
				}
			}		

		}); // end each		
	
	} // End plugin. Go eat cake.
	
})(jQuery);