// S3 Slideshow Class
function S3Slideshow(selector, pauseTime, transitionTime) {
    if (pauseTime == undefined) pauseTime = 5000;
    if (transitionTime == undefined) transitionTime = 1000;
    this.init(selector, pauseTime, transitionTime);
}

S3Slideshow.prototype = {
    // Declare slideshow variables
    currentItem: 0,
    
    // FUNCTIONS
    init: function(selector, pauseTime, transitionTime) {
        this.transitionTime = transitionTime;
        this.pauseTime = pauseTime;
        
        this.target = $(selector);
        
        this.images = $(selector + " #slideshowimages > img");
        this.numItems = this.images.length;
        
        // Dynamically add divs for the slideshow toggling
        var div1 = this.target.attr("id") + "_slideshowContainer1";
        var div2 = this.target.attr("id") + "_slideshowContainer2";
        
        this.target.append($.create("div", {"id": div1, "style": "position:absolute;top:0;left:0;" }, [
            "img", {}, [] ]));
        this.target.append($.create("div", {"id": div2, "style": "position:absolute;top:0;left:0;" }, [
            "img", {}, [] ]));
        
        // Set a reference to the two divs internally
        this.div1 = this.target.find("div#" + div1);
        this.div2 = this.target.find("div#" + div2);
        
        // Set up the initial display state
        // Hide the 2 divs
        this.div1.hide();
        this.div2.hide();
        
        this.getActiveDiv().fadeIn(this.transitionTime);
        this.setActiveImage(this.images.eq(this.getCurrentItem()).attr("src"));
        this.swapActiveBanner();
        
        if (this.numItems > 1) {
            this.start();
        }
    },
    
    start: function() {
        this.setTimer();
    },
    
    stop: function() {
        this.clearTimer();
    },
    
    next: function() {
        this.incrementItem();
        this.transition();
    },
    
    prev: function() {
        this.decrementItem();
        this.transition();
    },
    
    fadeOut: function() {
        this.swapActiveBanner();
        this.getActiveDiv().fadeOut(this.transitionTime);
    },
    
    transition: function() {
        this.fadeOut();
        this.setInactiveImage(this.images.eq(this.getCurrentItem()).attr("src"));
        this.getInactiveDiv().fadeIn(this.transitionTime);
    },
    
    goTo: function(index) {
        if (this.getCurrentItem() != (index - 1)) {
            this.stop();
            this.setCurrentItem(index-1);
            this.transition();
        }
    },
    
    clearTimer: function() {
        if (this.timer != undefined) clearInterval(this.timer);
    },
    
    setTimer: function() {
        this.timer = setInterval(this.delegate(this, this.next), this.pauseTime);
    },
    
    decrementItem: function() {
        this.currentItem--;
        if (this.currentItem < 0) {
            this.currentItem = this.numItems - 1;
        }
    },
    
    incrementItem: function() {
        this.currentItem++;
        if (this.currentItem >= this.numItems) {
            this.currentItem = 0;
        }
    },
    
    setActiveImage: function(imgUrl) {
        this.getActiveDiv().find("img").attr("src", imgUrl);
    },
    
    setInactiveImage: function(imgUrl) {
        this.getInactiveDiv().find("img").attr("src", imgUrl);
    },
    
    setCurrentItem: function(index) {
        this.currentItem = index;
    },
    
    getCurrentItem: function() {
        return this.currentItem;
    },
    
    getActiveDiv: function() {
        return (this.getActiveBanner() == 1 ? this.div1 : this.div2);
    },
    
    getInactiveDiv: function() {
        return (this.getActiveBanner() == 1 ? this.div2 : this.div1);
    },
	
	getCurrentImage: function() {
		return this.images.eq(this.getCurrentItem());
	},
    
    getActiveBanner: function() {
        return this.activeBanner;
    },
    
    swapActiveBanner: function() {
        this.activeBanner = this.activeBanner == 1 ? 2 : 1;
    },
    
    // Delegate function for callbacks
    delegate: function ( that, thatMethod )
    {
        return function() { return thatMethod.call(that); }
    }
}

var slideShow;
$(document).ready(function() {
	slideShow = new S3Slideshow("div#banner:has(div#slideshowimages)",5000,600);
});