/*
    This file is part of JonDesign's SmoothSlideshow v2.1.

    JonDesign's SmoothSlideshow is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    JonDesign's SmoothSlideshow is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Foobar; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Main Developer: Jonathan Schemoul (JonDesign: http://www.jondesign.net/)
    Contributed code by:
    - Christian Ehret (bugfix)
    - Simon Willison (addLoadEvent)
*/

// declaring the class
var timedSlideShow = Class.create();

// implementing the class
timedSlideShow.prototype = {
	initialize: function(element, data) {
		this.currentIter = 0;
		this.lastIter = 0;
		this.maxIter = 0;
		this.slideShowElement = element;
		this.slideShowData = data;
		this.slideShowInit = 1;
		this.slideElements = Array();
		this.slideShowDelay = 15000;
		this.articleLink = "";
		element.style.display="block";
		this.articleLink = document.createElement('a');
		this.articleLink.className = 'global';
		element.appendChild(this.articleLink);
		this.articleLink.href = "";

		this.maxIter = data.length;
		for(i=0;i<data.length;i++)
		{
			var currentImg = document.createElement('div');
			currentImg.className = "slideElement";
			currentImg.style.position="absolute";
			currentImg.style.left="0px";
			currentImg.style.top="0px";
			currentImg.style.margin="0px";
			currentImg.style.border="0px";
			currentImg.style.backgroundImage="url('" + data[i][0] + "')";
			currentImg.style.backgroundPosition="center center";

			this.articleLink.appendChild(currentImg);
			currentImg.currentOpacity = new fx.Opacity(currentImg, {duration: 400});
			currentImg.currentOpacity.set(0);
			this.slideElements[parseInt(i)] = currentImg;
		}
		if (data.length>1)
		{
			var leftArrow = document.createElement('a');
			leftArrow.className = 'left';
			leftArrow.onclick = this.pushPrevSlideShow.bind(this);
			element.appendChild(leftArrow);

			var rightArrow = document.createElement('a');
			rightArrow.className = 'right';
			rightArrow.onclick = this.pushNextSlideShow.bind(this);
			element.appendChild(rightArrow);
		}
		
		this.doSlideShow(1);
	},
	destroySlideShow: function(element) {
		var myClassName = element.className;
		var newElement = document.createElement('div');
		newElement.className = myClassName;
		element.parentNode.replaceChild(newElement, element);
	},
	pushNextSlideShow: function() {
		//setTimeout(this.nextSlideShow.bind(this),1000);
		setTimeout(this.nextSlideShow.bind(this),1000);
	},
	pushPrevSlideShow: function() {
		setTimeout(this.prevSlideShow.bind(this),1000);
	},
	startSlideShow: function() {
		this.lastIter = this.maxIter - 1;
		this.currentIter = 0;
		this.slideShowInit = 0;
		this.slideElements[parseInt(this.currentIter)].currentOpacity.set(1);
		setTimeout(this.nextSlideShow.bind(this),this.slideShowDelay);
	},
	nextSlideShow: function() {
		this.lastIter = this.currentIter;
		this.currentIter++;
		if (this.currentIter >= this.maxIter)
		{
			this.currentIter = 0;
			this.lastIter = this.maxIter - 1;
		}
		this.slideShowInit = 0;
		this.doSlideShow.bind(this)(1);
	},
	prevSlideShow: function() {
		this.lastIter = this.currentIter;
		this.currentIter--;
		if (this.currentIter <= -1)
		{
			this.currentIter = this.maxIter - 1;
			this.lastIter = 0;
		}
		this.slideShowInit = 0;
		this.doSlideShow.bind(this)(2);
	},
	goTo: function(num) {
		
		this.currentIter = num;
		if (num == 0) this.lastIter = this.maxIter-1;
		else this.lastIter = num-1;
		this.slideShowInit = 0;
		alert(this.maxIter);
		this.doSlideShow.bind(this)(1);
	},
	doSlideShow: function(position) {
		if (this.slideShowInit == 1)
		{
			imgPreloader = new Image();
			// once image is preloaded, start slideshow
			imgPreloader.onload=function(){
				setTimeout(this.startSlideShow.bind(this),100);
			}.bind(this);
			imgPreloader.src = this.slideShowData[0][0];
		} else {
			
			if (position == 1)
			{
				if (this.currentIter != 0) {
					this.slideElements[parseInt(this.currentIter)].currentOpacity.options.onComplete = function() {
						this.slideElements[parseInt(this.lastIter)].currentOpacity.set(0);
					}.bind(this);
					this.slideElements[parseInt(this.currentIter)].currentOpacity.custom(0, 1);
				} else {
					this.slideElements[parseInt(this.currentIter)].currentOpacity.set(1);
					this.slideElements[parseInt(this.lastIter)].currentOpacity.custom(1, 0);
				}
			} else  {
				if (this.currentIter != this.maxIter - 1) {
					this.slideElements[parseInt(this.currentIter)].currentOpacity.set(1);
					this.slideElements[parseInt(this.lastIter)].currentOpacity.custom(1, 0);
				} else {
					this.slideElements[parseInt(this.currentIter)].currentOpacity.options.onComplete = function() {
						this.slideElements[parseInt(this.lastIter)].currentOpacity.set(0);
					}.bind(this);
					this.slideElements[parseInt(this.currentIter)].currentOpacity.custom(0, 1);
				}
				
			}
			setTimeout(this.nextSlideShow.bind(this),this.slideShowDelay);
		}
	}
};

function initTimedSlideShow(element, data) {
	var slideshow = new timedSlideShow(element, data);
}

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}