/**
 * @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.'+wrapper+'_scroller'); // For unique subclasses to allow nested carousels
	    this.content    = this.wrapper.down('div.'+wrapper+'_scroller_content');
	    this.sections   = this.wrapper.getElementsBySelector('div.'+wrapper+'_section');
	    this.options    = Object.extend({ duration: 1.0, frequency: 3 }, options || {});
	    // Added by Shastic for height transitioning
			// new Effect.Scale(this.wrapper, percent, options);
	    //this.heightFxOptions = { scaleX: false, scaleContent: false, duration: 0.4 };
	    this.heightFxOptions = { duration: 0.75 };
	    this.controlsParent = (options.controlsParent ? $(options.controlsParent) : null);
      this.maxHeight = 0;
			// -----
			
	    this.sections.each( function(section, index) {
	      section._index = index;
	    });    

	    this.events = {
	      click: this.click.bind(this)
	    };

	    this.addObservers();
	    
	    // initialSection should be the id of the section you want to show up on load
			// Modified by Shastic
			if (this.options.initialSection) { 
				this.moveTo( (this.wrapper.id + '_' + this.options.initialSection), this.scroller, { duration:this.options.duration }) 
			} else { 
				//this.current = this.sections.first(); 
				this.setCurrent(this.sections.first());
				if (this.controls != '') this.controls.first().addClassName('active');
			}
			// -----  
			if(this.options.autoGlide) this.start();
			
	},
	
	setCurrent: function(element) {
		//console.info(element);
		this.current = element;
		// Fire custom 'section_active' event for the recently activated section to handle IE's inefficiencies.
		//element.fire("glider:section_active"); // For the section
		this.wrapper.fire("glider:section_active"); // For the main wrapper
		//console.info('firing glider:section_active');
	},
	
	checkMaxHeight: function() {
		this.maxHeight = 0; // Reset maxHeight
		
		// Fixed height
    /*for(var i=0; i<this.sections.length; i++) {
        if(this.sections[i].getHeight() > this.maxHeight) {
            this.maxHeight = this.sections[i].getHeight();
        }
    }*/
    
    // Variable height
    this.maxHeight = Math.ceil(this.current.down().getHeight());
  },

  attachMaxHeight: function() {
  	//console.info('maxHeight: '+this.maxHeight);
    
    /*if(this.content.getHeight() != this.maxHeight) this.content.setStyle({height: this.maxHeight+"px"});
    if(this.scroller.getHeight() != this.maxHeight) this.scroller.setStyle({height: this.maxHeight+"px"});
    if(this.wrapper.getHeight() != this.maxHeight) this.wrapper.setStyle({height: this.maxHeight+"px"});
    
    for(var i=0; i<this.sections.length; i++) {
    	if(this.sections[i].getHeight() != this.maxHeight) this.sections[i].setStyle({height: this.maxHeight+"px"});	
    }*/
    
    var effects = new Array();
    
    options = {
				sync: true,
				style: 'height:'+this.maxHeight+'px;',
        scaleContent: false,
        transition: Effect.Transitions.sinoidal,
        scaleX: false,
        scaleY: true
		};
    
    effects.push(new Effect.Morph(this.current, options));
    effects.push(new Effect.Morph(this.content, options));
    effects.push(new Effect.Morph(this.scroller, options));
    effects.push(new Effect.Morph(this.wrapper, options));
    
    new Effect.Parallel(effects, this.heightFxOptions);
  },
	
  addObservers: function() {
    // Modified by Shastic
    this.controls = ((this.controlsParent != null) ? this.controlsParent.getElementsBySelector('a') : this.wrapper.getElementsBySelector('div.controls a'));
    // -----
    this.controls.invoke('observe', 'click', this.events.click);
  },	

  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 });     
    Event.stop(event);
  },

	moveTo: function(element, container, options){
		//console.info('moveTo');
		//this.current = $(element);
		this.setCurrent($(element));
		
		Position.prepare();
		var containerOffset = Position.cumulativeOffset(container);
		elementOffset = Position.cumulativeOffset($(element));

		this.scrolling 	= new Effect.SmoothScroll(container, 
		{duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
		
		
		// Added by Shastic to have the Glider adjust the height to the current element's height.
		//console.info('this.current.offsetHeight: '+this.current.down().offsetHeight);
		//var ancestorHeight = ( (options.ancestorIndex != null) ? this.sections[options.ancestorIndex].down().offsetHeight : this.wrapper.offsetHeight );
		//console.info('ancestorHeight: '+ancestorHeight);
		//var transitionPercentage = Math.ceil((this.current.down().offsetHeight*100)/ancestorHeight);
		this.checkMaxHeight();
		//var newHeight = Math.ceil(this.current.down().offsetHeight);
		//console.info('newHeight: '+newHeight);
		
		//console.info(this.current.down().scrollHeight);
		//console.info('newHeight: '+newHeight);
		//console.info('transitionPercentage: '+transitionPercentage);
		/*this.heightFx = this.current.morph(('height: '+newHeight+'px'), this.heightFxOptions);
		this.heightFx = this.content.morph(('height: '+newHeight+'px'), this.heightFxOptions);
		this.heightFx = this.scroller.morph(('height: '+newHeight+'px'), this.heightFxOptions);
		this.heightFx = this.wrapper.morph(('height: '+newHeight+'px'), this.heightFxOptions);*/
		
		this.attachMaxHeight();
		
		// Add the button activation effect
		var initialSection = this.options.initialSection;
		var controls = this.controls;
		var section = this.sections;
		var current = this.current;
		
		controls.each(function (control) { 
			if (current != null) {
				if (control.href.split("#")[1] ==  current.id) { 
					(!control.hasClassName('active')) ? control.addClassName('active') : null
				} else {
					(control.hasClassName('active')) ? control.removeClassName('active') : null
				}
			} else {
				if (initialSection != null && controls != '') { 
					if (control.href.split("#")[1] == initialSection) control.addClassName('active'); 
				} else if (controls != '') {
					if (control.href.split("#")[1] == sections.first().id) control.addClassName('active');
				}
			}
		});
		
		// Event firing
    // console.info(this.options.onChange);
    if (this.options.onChange != null) { this.options.onChange(); } 

		// -----
		return false;
	},
		
  next: function(){
    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
    });
  },
	
  previous: function(){
    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
    });
  },

	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;
  }
});