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var MDSK = {}
MDSK.Slideshow = Class.create();
MDSK.Slideshow.DefaultOptions = {
  duration: 0.6,
  seconds_per_slide: 3.0,
  max_num_run: 2,
  pause_on_mouseover: false, // TODO: pause_on_mouseover
  onChange: function() {}
}

Object.extend(MDSK.Slideshow.prototype, {
  initialize: function(container, slide_selector, options) {
	var me = this;  
    this.options = Object.extend(Object.extend({},MDSK.Slideshow.DefaultOptions), options || {});
    this.container = $(container);
	this.slides = Selector.findChildElements(this.container, [slide_selector]);
	//this.slides.sort(function(a,b){
			//return me.rndm(-1,1);
		//});
    this.currentSlide = 0;
	this.counter = 1;  // count number of run from 1
    this.paused = false;
    var self = this;
    var Found=false
    this.slides.each(function(slide, idx) {
      if (idx > 0) Element.hide(slide);
      if (self.options.pause_on_mouseover) {
        // Event.observe(slide, 'mouseover', self.pause.bind(self))
        // Event.observe(slide, 'mouseout', self.unpause.bind(self))
      }
    })
    this.slides[0].style.display = "block";
   	
	this.start();
    this.options.onChange(this);
  },
  
  forward: function() {
    var newSlideIdx = this.currentSlide+1;
    if (newSlideIdx >= this.slides.length) 
	{
		newSlideIdx = 0;
		this.counter = this.counter + 1;
		if (this.counter > this.options.max_num_run)    // 2 runs of the slideshow
		{
			this.stop();   // total stop
			pauseAlways();
		}
	}
    this.transition(newSlideIdx);
  },
  
  backward: function() {
    var newSlideIdx = this.currentSlide-1;
    if (newSlideIdx < 0) newSlideIdx = this.slides.length-1;
	
	var currNum = newSlideIdx+1;
	var num1 = document.getElementById("numDisp");	
	num1.src = null;
	num1.src = "" + currNum + ".jpg";

    this.transition(newSlideIdx);
  },
  
  jumpToSlide: function(idx) {
    if (idx < 0 || idx >= this.slides.length) return false;
    this.stop();
    this.transition(idx);
/* ------------------custom code - you can delete this if you want to customize the slideshow\s look and feel your way. this code is used to change the background color of the div's when slideshow moves from one slide to another---------------*/
	//for (i = 0; i < this.slides.length; i++)
	//{
		//var nam = document.getElementById("showStyle"+i);
		//if(idx == i)
		//{
			//nam.style.backgroundColor = "#666666";
		//}
		//else
		//{
			//nam.style.backgroundColor = "#999999";
		//}
	//}
/*-----------------------custom code ends------------------*/
  },
  
  start: function() {
    if (this.interval) return;
    this.interval = setInterval(this.forward.bind(this), this.options.seconds_per_slide * 1000);
    this.container.addClassName('playing');
  },
  
  stop: function() {
    if (!this.interval) return;
    clearInterval(this.interval);
    this.interval = null;
    this.container.removeClassName('playing');
  },
  
  pausePlay: function() {
    if (this.interval)  this.stop();
    else {
		this.counter = 1;  // counter return to 1
		this.start();
	}
    },
	
  rndm : function(min, max){
		return Math.floor(Math.random() * (max - min + 1) + min);
	},			
	
  /* ========== */
  
  transition: function(newSlideIdx) {
    var oldSlideIdx = this.currentSlide;
    if (newSlideIdx == oldSlideIdx) return;
    if (this.fadeIn && this.fadeIn.state != 'finished') this.fadeIn.cancel();
    if (this.fadeOut && this.fadeOut.state != 'finished') {
      this.fadeOut.cancel(); Element.hide(this.fadeOut.element);
    }
    this.fadeOut = new Effect.Fade(this.slides[oldSlideIdx], {duration: this.options.duration});
    this.fadeIn = new Effect.Appear(this.slides[newSlideIdx], {duration: this.options.duration});
    this.currentSlide = newSlideIdx;
    this.options.onChange(this);
	
	
/* ------------------custom code - you can delete this if you want to customize the slideshow\s look and feel your way. this code is used to change the background color of the div's when slideshow moves from one slide to another---------------*/
	for (i = 0; i < this.slides.length; i++)
	{
		var nam = document.getElementById("showStyle"+i);
		if(this.currentSlide == i)
		{
			nam.style.backgroundColor = "#666666";
		}
		else
		{
			nam.style.backgroundColor = "#999999";
		}
	}
	/*--------------------------custom code ends ----------------------*/
  } 
});