Tactica.Slideshow = function()
{
	this.fadeTime = 500; // ms
	this.slideArray = new Array();
	this.slideIndex = -1;
	this.swapTime = 5000 // ms;
	this.timer = null;
}

// creates a new slideshow in the specified element
Tactica.Slideshow.create = function(id)
{
	var target = $("#" + id);

	if (target.length > 0)
	{
		var slideshow = new Tactica.Slideshow();
		var w = target.width(), h = target.height();

		for (var i = 1; i < arguments.length; i++)
		{
			var slide = $(document.createElement("DIV"));
			var slideImage = arguments[i];

			if (slideImage.indexOf('/') != 0)
			{
				slideImage = Tactica.basePath + slideImage;
			}

			slide.addClass("slide");
			slide.css({ backgroundImage: "url('" + slideImage + "')", left: "0px", overflow: "hidden", position: "absolute", top: "0px" });
			slide.height(h);
			slide.width(w);

			if (i > 1)
				slide.css("zIndex", 1).fadeTo(0, 0);
			else
				slide.css("zIndex", 2);

			slideshow.slideArray.push(slide);

			target.append(slide);
		}

		slideshow.slideIndex = 0;
		slideshow.start();

		return slideshow;
	}

	return null;
}

// creates a new slideshow from an existing unordered list
Tactica.Slideshow.createFromList = function(id)
{
	var slides = $("#" + id + " > LI");
	
	if (slides.length > 1)
	{
		var slideshow = new Tactica.Slideshow();
		
		for (var i = 0; i < slides.length; i++)
		{
			var slide = slides.eq(i);
			
			if (i > 0)
				slide.css("zIndex", 1).fadeTo(0, 0);
			else
				slide.css("zIndex", 2);
			
			slideshow.slideArray.push(slide);
		}
		
		slideshow.slideIndex = 0;
		slideshow.start();
	}
}

// shows the next slide
Tactica.Slideshow.prototype.nextSlide = function()
{
	var me = this;

	me.showSlide(me.slideIndex + 1);
}


// shows a specific slide and stops the slideshow
Tactica.Slideshow.prototype.showSlide = function(index, stop)
{
	var me = this;
	var i1 = me.slideIndex;
	var i2 = me.slideArray.length > 0 ? index % me.slideArray.length : 0;
	var s1 = me.slideArray[i1];

	me.slideArray[i1].css("z-index", 1); //.fadeTo(me.fadeTime, 0);
	me.slideArray[i2].css("z-index", 2).fadeTo(me.fadeTime, 1, function() { s1.fadeTo(me.fadeTime, 0) });
	me.slideIndex = i2;

	if (!stop)
	{
		me.timer = window.setTimeout(function() { me.nextSlide() }, me.fadeTime + me.swapTime);
	}
}

// starts the slideshow
Tactica.Slideshow.prototype.start = function()
{
	var me = this;

	if (me.timer)
	{
		window.clearTimeout(me.timer);
	}

	me.timer = window.setTimeout(function() { me.nextSlide() }, me.fadeTime + me.swapTime);
}

// stops the slideshow
Tactica.Slideshow.prototype.stop = function()
{
	if (this.timer)
	{
		window.clearInterval(this.timer);
	}

	this.timer = null;
}