/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://www.missingmethod.com/projects/glider/
 * @version 0.0.3
 * @dependencies prototype.js 1.5.1+, effects.js
 */

/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */

Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
	initialize: function(wrapper, options){

	    this.scrolling  = false;
	    this.wrapper    = $(wrapper);
	    this.scroller   = this.wrapper.down('div.scroller');
	    this.sections   = this.wrapper.getElementsBySelector('div.section');
	    this.options    = Object.extend({ duration: 2.0, frequency: 1 }, options || {});
		/*1 = forward, 0 = backward */
		this.direction  = 1;
	    this.sections.each( function(section, index) {
	      section._index = index;
	    });

	    this.events = {
	      click: this.click.bind(this)
	    };
	    this.addObservers();
	    if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration });  // initialSection should be the id of the section you want to show up on load
	    if(this.options.autoGlide) this.start();
	},

  addObservers: function() {
    /*var controls = this.wrapper.getElementsBySelector('div.controls a');*/

    
    if (this.wrapper.identify() == 'location-glider') {
    
    	var controlsDD = $$('div.controls dd');
	controlsDD.invoke('observe', 'click', this.clickDD.bind(this));
    	var controlsDTA = $$('div.controls dt a');
	controlsDTA.invoke('observe', 'click', this.clickDTA.bind(this));
		
    } else {
        var controls = $$('div.controls a');
    	controls.invoke('observe', 'click', this.events.click);
    	this.addUSPObservers();
    }
    
    
  },
  
  /*Ein- und Ausblenden der Links zum Starten und Stoppen der Animation*/
  changeAnimationStatusLink:function(event){
    var element = Event.findElement(event, 'a');
    if(element.id == 'glider-stop'){
    	$('glider-start').show();
    	$('glider-stop').hide();
    } else {
    	$('glider-stop').show();
    	$('glider-start').hide();
    }
    Event.stop(event);
  },
  
  /*Observe fuer die Start und Stopp buttons*/
  addUSPObservers: function() {
    var animationButtons = $$('#product-animation a');
    animationButtons.invoke('observe', 'click', this.changeAnimationStatusLink);
    if ( $('glider-stop') != null ) {
		$('glider-stop').removeClassName ('invisible');
		$('glider-stop').show();
	}
	if ( $('glider-start') != null ) {
		$('glider-start').removeClassName ('invisible');
		$('glider-start').hide();
	}  
  },
  

  click: function(event) {
    this.stop();
    var element = Event.findElement(event, 'a');
    if (this.scrolling) this.scrolling.cancel();
    this.moveTo(element.href.split("#")[1], this.scroller, { duration:this.options.duration });
	var controls = $$('div.controls a');
	controls.invoke('removeClassName', 'active');
	element.addClassName('active');
    Event.stop(event);
    if (this.timer != null) {
	clearTimeout(this.timer);
    }
    this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
    $('glider-stop').show();
    $('glider-start').hide();
  },
  
  clickDD: function(event) {
    this.stop();
    var element = Event.findElement(event, 'dd');
    if (this.scrolling) this.scrolling.cancel();
    this.moveTo(element.previous().down().href.split("#")[1], this.scroller, { duration:this.options.duration });
    Event.stop(event);
  },
  
  clickDTA: function(event) {
    this.stop();
    var element = Event.findElement(event, 'a');
    if (this.scrolling) this.scrolling.cancel();
    this.moveTo(element.href.split("#")[1], this.scroller, { duration:this.options.duration });
    Event.stop(event);
  },

  moveTo: function(element, container, options){
	
	if($(element) == null) return;
	
	this.current = $(element);

	Position.prepare();

	var containerOffset = Position.cumulativeOffset(container);

	var elementOffset = Position.cumulativeOffset($(element));

	this.scrolling 	= new Effect.SmoothScroll(container,
		{duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
	
	var controls = $$('div.controls a');
	controls.invoke('removeClassName', 'active');
	var nameOfCurrentControlA = "nav-" + $(element).identify(); 
	if( $(nameOfCurrentControlA) != null ) {
		$(nameOfCurrentControlA).addClassName('active');
	}
	return false;
  },

  next: function(){
  
    if (this.timer != null) {
	clearTimeout(this.timer);
    }
        
    if (this.current) {
      var currentIndex = this.current._index;
      /*var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;*/
	  if (this.sections.length - 1 == currentIndex) {
		this.direction = 0;
	  } else if (currentIndex == 0) {
		this.direction = 1;
	  }
	  if (this.direction == 0 ) {
		var nextIndex = currentIndex - 1;
	  } else {
		var nextIndex = currentIndex + 1;
	  }
  
    } else var nextIndex = 1;
	
    this.moveTo(this.sections[nextIndex], this.scroller, {
      duration: this.options.duration
    });

  },
  
  clickNext: function(){
  	if (this.timer != null) {
	clearTimeout(this.timer);
    }
	
	if (this.current) {
      var currentIndex = this.current._index;
      var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;
    } else var nextIndex = 1;
	
    this.moveTo(this.sections[nextIndex], this.scroller, {
      duration: this.options.duration
    });
	
  	$('glider-stop').hide();
  	$('glider-start').show();
  },

  previous: function(){
    
    if (this.timer != null) {
	clearTimeout(this.timer);
    }
    
    if (this.current) {
      var currentIndex = this.current._index;
      var prevIndex = (currentIndex == 0) ? this.sections.length - 1 :
       currentIndex - 1;
    } else var prevIndex = this.sections.length - 1;

    this.moveTo(this.sections[prevIndex], this.scroller, {
      duration: this.options.duration
    });
    
  },
  
  clickPrevious: function(){
  	this.previous();
  	$('glider-stop').hide();
  	$('glider-start').show();
  },

	stop: function()
	{
		clearTimeout(this.timer);
	},

	start: function()
	{
		this.periodicallyUpdate();
	},

	periodicallyUpdate: function()
	{
		if (this.timer != null) {
			clearTimeout(this.timer);
			this.next();
		}
		this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
	}

});

Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
  initialize: function(element) {
    this.element = $(element);

    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'absolute'
    } , arguments[1] || {}  );
    this.start(options);
  },
  setup: function() {
    if (this.options.continuous && !this.element._ext ) {
      this.element.cleanWhitespace();
      this.element._ext=true;
      this.element.appendChild(this.element.firstChild);
    }

    this.originalLeft=this.element.scrollLeft;
    this.originalTop=this.element.scrollTop;

    if(this.options.mode == 'absolute') {
      this.options.x -= this.originalLeft;
      this.options.y -= this.originalTop;
    }
  },
  update: function(position) {
  
    this.element.scrollLeft = this.options.x * position + this.originalLeft;
    this.element.scrollTop  = this.options.y * position + this.originalTop;
  }
});