/* Aura version: 1.8.5 */


/*

 Plugin: PI Parallax

 Version 1.0.0

 Author: Pavel Shlykov



 Dual licensed under the MIT and GPL licenses:

 http://www.opensource.org/licenses/mit-license.php

 http://www.gnu.org/licenses/gpl.html

 */



jQuery(function($) {

	var $w = $(window),

		$d = $(document),

		windowHeight = $w.height(),

		elements = [];



	$w.resize(function () {

		windowHeight = $w.height();

	});



	$.fn.parallax = function () {



		$(this).each(function () {



			var $el = $(this),

				el = {

					$el: $el,

					t: $el.offset().top,

					x: $el.data('parallaxX') || '50%',

					y: $el.data('parallaxY') || 0,

					s: $el.data('parallaxSpeed') || 0.5,

					h: getHeight($el, ($el.data('parallaxOuterHeight') || 1))

				};



			elements.push(el);



		});



	};



	$d.on('piBoundChanged', function(){

		checkParallaxState();

	});

	checkParallaxState();



	function checkParallaxState(){

		if(window.piCurrentBound == 'lg'){

			enableParallax();

		} else {

			disableParallax();

		}

	}



	function update() {

		var scrollTop = $w.scrollTop();



		for (var i = 0; i < elements.length; i++) {

			var o = elements[i];

				o.t = o.$el.offset().top;

				o.h = getHeight(o.$el, 1);



			if (o.t + o.h > scrollTop && o.t < scrollTop + windowHeight) {

				o.$el.css('backgroundPosition', o.x + " " + Math.round((o.t - scrollTop + o.y) * o.s) + "px");

			}

		}

	}



	function getHeight($el, outerHeight) {

		if (outerHeight) {

			return $el.outerHeight(true);

		} else {

			return $el.height();

		}

	}



	function enableParallax(){

		$w.on('scroll.piParallax resize.piParallax', update);

		update();

	}



	function disableParallax(){

		$w.off('scroll.piParallax resize.piParallax');

		for (var i = 0; i < elements.length; i++) {

			var o = elements[i];

			o.$el.css('backgroundPosition', '');

		}

	}





});