//preconditions
// This plugin relies on the following html structure
// <div id="someid">
// 	<div class="wbSlide"></div>
// 	<div class="wbSlide"></div>
// 	<div class="wbSlide"></div>
// </div>
// The option "slideClass" will define what class is counted as slides. The default will be wbSlide

(function($) {

$.fn.wbSlider = function(options) {
		// plugin default options
        var defaults = {
			time : 5000,
			speed : 700,
			slideRandomly : false,
			prevSlideButton : "#wbSlideLeft", // this can be any selector, as it is passed into the $ function
			nextSlideButton : "#wbSlideRight", // see above
			slideClass : "wbSlide",
			autoStart : true
        }; // close defaults

		// extends defaults with options provided
        if (options) {
			$.extend(defaults, options);
		} //close if

		// iterate over matched elements
return this.each(function() {
	wbSlide = {};
	wbSlide.slides = $("." + defaults.slideClass);
	wbSlide.numOfSlides = wbSlide.slides.length;
	wbSlide.slideWidth = wbSlide.slides.first().outerWidth();
	wbSlide.slideHeight = wbSlide.slides.first().outerHeight();
	wbSlide.slider = $(this);
	wbSlide.init = function(){
	    //set up container
		wbSlide.slider.wrap("<div class='wbSliderWrap' />");
		wbSlide.sliderWrap = wbSlide.slider.parent();
		wbSlide.sliderWrap.css({
			position : "relative",
			width : wbSlide.slideWidth,
			height : wbSlide.slideHeight,
			overflow : "hidden"
		}).append("<div class='clearboth' style='clear:both'/>");
		wbSlide.slider.css({
			width: wbSlide.slideWidth * wbSlide.numOfSlides
		})
		wbSlide.slides.first().addClass("first current");
		wbSlide.slides.last().addClass("last");
		wbSlide.slides.css({
			"position" : "relative",
			"float" : "left",
			"overflow" : "hidden"
		});
	};
	wbSlide.prevSlide = function(){
		var currentPosIndex = $(wbSlide.slides).filter(".current").index();
		if (currentPosIndex == 0) {
			var nextPosIndex = $(wbSlide.slides).filter(".last").index();
		} else {
			var nextPosIndex = currentPosIndex - 1; 
		}
		$(wbSlide.slider).animate({
			marginLeft : -1 * wbSlide.slideWidth * nextPosIndex
			}, defaults.speed, function(){
				$(wbSlide.slides).filter(".current").removeClass("current");
				$(wbSlide.slides).eq(nextPosIndex).addClass("current");
			});
	};
	wbSlide.nextSlide = function(){
		var currentPosIndex = $(wbSlide.slides).filter(".current").index();
		var lastIndex = $(wbSlide.slides).filter(".last").index();
		if (currentPosIndex == lastIndex) {
			var nextPosIndex = 0;
		} else {
			var nextPosIndex = currentPosIndex + 1;
		}
		$(wbSlide.slider).animate({
			marginLeft : -1 * wbSlide.slideWidth * nextPosIndex
			}, defaults.speed, function(){
				$(wbSlide.slides).filter(".current").removeClass("current");
				$(wbSlide.slides).eq(nextPosIndex).addClass("current");
		});	
	}
	
	wbSlide.autoStart = function(){
		setInterval(wbSlide.nextSlide, defaults.time);
	}
	wbSlide.clickHandle = function(){
		$(defaults.prevSlideButton).click(function(){
			wbSlide.prevSlide();
		});
		$(defaults.nextSlideButton).click(function(){
			wbSlide.nextSlide();
		});
	}
	
	//call the functions
	wbSlide.init()
	wbSlide.clickHandle();
	if (defaults.autoStart){
		wbSlide.autoStart();
	}
});

} //closing plugin definition
})(jQuery);