// -------------------------------------------------------------------------------------------
// fullscreen slideshow 
// 
// extends avia slideshow script with a more sophisticated preloader and fixed size for slider
// -------------------------------------------------------------------------------------------

(function($)
{
    "use strict";

	$.aviafullscreenslider  =  function(options, slider)
	{
	    this.$slider  	= $( slider ); 
	    this.$inner	  	= this.$slider.find('.avia-slideshow-inner');
	    this.$innerli	= this.$inner.find('>li');
	    this.$caption 	= this.$inner.find('.avia-slide-wrap .caption_container');
	    this.$win	  	= $( window );
	    this.ismobile 	= $.avia_utilities.ismobile;
	    this.property 	= {};
	    this.scrollpos	= "0";
	    this.transform3d= document.documentelement.classname.indexof('avia_transform3d') !== -1 ? true : false;
	    this.ticking 	= false; 
	    
	    
	    if($.avia_utilities.supported.transition === undefined)
		{
			$.avia_utilities.supported.transition = $.avia_utilities.supports('transition');
		}
		
	    this._init( options );
	}

	$.aviafullscreenslider.defaults  = {

		//height of the slider in percent
		height: 100,
		
		//subtract elements from the height
		subtract: '#wpadminbar, #header, #main>.title_container'
		
		
	};

  	$.aviafullscreenslider.prototype =
    {
    	_init: function( options )
    	{
    		var _self = this;
    		//set the default options
    		this.options = $.extend( true, {}, $.aviafullscreenslider.defaults, options );
    		
    		if(this.$slider.data('slide_height')) this.options.height = this.$slider.data('slide_height');
    		
    		//if background attachment is set to fixed or scroll disable the parallax effect
    		this.options.parallax_enabled = this.$slider.data('image_attachment') == "" ? true : false;
    		
    		//elements that get subtracted from the image height
    		this.$subtract = $(this.options.subtract);
    		
    		
			// set the slideshow size
			this._setsize(); 
    		
			// set resizing script on window resize
			this.$win.on( 'debouncedresize',  $.proxy( this._setsize, this) );
    		
    		//parallax scroll if element if leaving viewport
			settimeout(function()
			{
				if(!_self.ismobile && _self.options.parallax_enabled) //disable parallax scrolling on mobile
    			{
	    			_self.$win.on( 'scroll', $.proxy( _self._on_scroll, _self) );
    			}
    			
    		},100);
			/**/
    		
			//activate the defaule slider
			this.$slider.aviaslider({bg_slider:true});
			
			
    	},
    	
    	_on_scroll: function(e)
    	{
	    	var _self = this;
	    	
	    	if(!_self.ticking) {
		     _self.ticking = true;
		      window.requestanimationframe( $.proxy( _self._parallax_scroll, _self) );
		    }
    	},
    	
    	
    	_fetch_properties: function(slide_height)
		{
			this.property.offset 	= this.$slider.offset().top;
			this.property.wh 		= this.$win.height();
			this.property.height 	= slide_height || this.$slider.outerheight();
			
			//re-position the slider
			this._parallax_scroll();
		},
    	
    	_setsize: function( )
    	{	
    		if(!$.fn.avia_browser_height)
    		{
    	
    		var viewport		= this.$win.height(),
    			slide_height	= math.ceil( (viewport / 100) * this.options.height );
			
			if(this.$subtract.length && this.options.height == 100)
			{
	    		this.$subtract.each(function()
	    		{
	    			slide_height -= this.offsetheight - 0.5;
	    		});
    		}
    		else
    		{
    			slide_height -= 1;
    		}
    		this.$slider.height(slide_height).removeclass('av-default-height-applied');
    		this.$inner.css('padding',0);
    		}
    		
    		
    		this._fetch_properties(slide_height);
    	},
    	
    	_parallax_scroll: function(e)
    	{
    		if(this.ismobile || ! this.options.parallax_enabled) return; //disable parallax scrolling on mobile
    	
    		var wintop 		= this.$win.scrolltop(),
    			winbottom	=  wintop + this.property.wh,
    			scrollpos 	= "0", 
    			prop 		= {}, prop2 = {};
    		
    		if(this.property.offset < wintop && wintop <= this.property.offset + this.property.height)
    		{	
    			scrollpos = math.round( (wintop - this.property.offset) * 0.3 );
    		}
    		
    		if(this.scrollpos != scrollpos)
    		{	
    			//slide background parallax
    			this.scrollpos = scrollpos;
    			
    			//currently no 3d transform, because of browser quirks
    			//this.transform3d = false;
    			
    			if(this.transform3d)
    			{
    				prop[$.avia_utilities.supported.transition+"transform"] = "translate3d(0px,"+ scrollpos +"px,0px)";
    			}
    			else
    			{
    				prop[$.avia_utilities.supported.transition+"transform"] = "translate(0px,"+ scrollpos +"px)";
    			}
    			
    			
    			this.$inner.css(prop);
    			
    			
    			
    			//slider caption parallax
    			
				// prop2[$.avia_utilities.supported.transition+"transform"] = "translate(0px,-"+ ( scrollpos * 1) +"px)";
				/*
	    		prop2['opacity'] = math.ceil((this.$slider.height() - (scrollpos * 2)) / 100)/ 10;
	    		prop2['opacity'] = prop2['opacity'] < 0 ? 0 : prop2['opacity'];
	    		this.$caption.css(prop2);
				*/
    		}
    		
    		this.ticking = false;
    	}
    };



	$.fn.aviafullscreenslider = function( options )
	{
		return this.each(function()
		{
			var active = $.data( this, 'aviafullscreenslider' );
	
			if(!active)
			{
				//make sure that the function doesnt get aplied a second time
				$.data( this, 'aviafullscreenslider', 1 );
				
				//create the preparations for fullscreen slider
				new $.aviafullscreenslider( options, this );
			}
		});
	}
	
})(jquery);