/*!
 * This file contains the scripts require the viewport-checker library
	 - Infinte Scroll in Archives - Archives
	 - Content Index Shortcode    - Single posts and pages
 * The Archives Ajax pagination method

 * This file will be loaded in:
	 - Single Page if the Content Index Shortcode is active
	 - Archive Pages if the Load More or Infinite Scroll Navigation is active
 */

/*! jQuery-viewport-checker v1.8.8 (c) 2015 Dirk Groenen https://github.com/dirkgroenen/jQuery-viewport-checker MIT @license: en.wikipedia.org/wiki/MIT_License */
/*
		The MIT License (MIT)
		Copyright (c) 2014 Dirk Groenen
		Permission is hereby granted, free of charge, to any person obtaining a copy of
		this software and associated documentation files (the "Software"), to deal in
		the Software without restriction, including without limitation the rights to
		use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
		the Software, and to permit persons to whom the Software is furnished to do so,
		subject to the following conditions:
		The above copyright notice and this permission notice shall be included in all
		copies or substantial portions of the Software.
*/

/**
	Search for By TieLabs for Modification.
*/

(function($){
		$.fn.viewportChecker = function(useroptions){
				// Define options and extend with user
				var options = {
						classToAdd: 'visible',
						classToRemove : 'invisible',
						classToAddForFullView : 'full-visible',
						removeClassAfterAnimation: false,
						offset: 100,
						repeat: false,
						invertBottomOffset: true,
						callbackFunction: function(elem, action){},
						scrollHorizontal: false,
						scrollBox: window
				};
				$.extend(options, useroptions);

				// Cache the given element and height of the browser
				var $elem = this,
						boxSize = {height: $(options.scrollBox).height(), width: $(options.scrollBox).width()};

				/*
				 * Main method that checks the elements and adds or removes the class(es)
				 */
				this.checkElements = function(){
						var viewportStart, viewportEnd;

						// Set some vars to check with
						if (!options.scrollHorizontal){
								viewportStart = Math.max(
										$('html').scrollTop(),
										$('body').scrollTop(),
										$(window).scrollTop()
								);
								viewportEnd = (viewportStart + boxSize.height);
						}
						else{
								viewportStart = Math.max(
										$('html').scrollLeft(),
										$('body').scrollLeft(),
										$(window).scrollLeft()
								);
								viewportEnd = (viewportStart + boxSize.width);
						}

						// Loop through all given dom elements
						$elem.each(function(){
								var $obj = $(this),
										objOptions = {},
										attrOptions = {};

								//  Get any individual attribution data
								if ($obj.data('vp-add-class'))
										attrOptions.classToAdd = $obj.data('vp-add-class');
								if ($obj.data('vp-remove-class'))
										attrOptions.classToRemove = $obj.data('vp-remove-class');
								if ($obj.data('vp-add-class-full-view'))
										attrOptions.classToAddForFullView = $obj.data('vp-add-class-full-view');
								if ($obj.data('vp-keep-add-class'))
										attrOptions.removeClassAfterAnimation = $obj.data('vp-remove-after-animation');
								if ($obj.data('vp-offset'))
										attrOptions.offset = $obj.data('vp-offset');
								if ($obj.data('vp-repeat'))
										attrOptions.repeat = $obj.data('vp-repeat');
								if ($obj.data('vp-scrollHorizontal'))
										attrOptions.scrollHorizontal = $obj.data('vp-scrollHorizontal');
								if ($obj.data('vp-invertBottomOffset'))
										attrOptions.scrollHorizontal = $obj.data('vp-invertBottomOffset');

								// Extend objOptions with data attributes and default options
								$.extend(objOptions, options);
								$.extend(objOptions, attrOptions);

								// If class already exists; quit
								if ($obj.data('vp-animated') && !objOptions.repeat){
										return;
								}

								// Check if the offset is percentage based
								if (String(objOptions.offset).indexOf("%") > 0)
										objOptions.offset = (parseInt(objOptions.offset) / 100) * boxSize.height;

								// Get the raw start and end positions
								var rawStart = (!objOptions.scrollHorizontal) ? $obj.offset().top : $obj.offset().left,
										rawEnd = (!objOptions.scrollHorizontal) ? rawStart + $obj.height() : rawStart + $obj.width();

								// Add the defined offset
								var elemStart = Math.round( rawStart ) + objOptions.offset,
										elemEnd = (!objOptions.scrollHorizontal) ? elemStart + $obj.height() : elemStart + $obj.width();

								if (objOptions.invertBottomOffset)
										elemEnd -= (objOptions.offset * 2);


								// Add class if in viewport
								if ((elemStart < viewportEnd) && (elemEnd > viewportStart)){


										/**
										 * By TieLabs
										 * If the elemnt is not in the top of the ViewPort don't run
										 * Needed for some features such as Content Index to prevent
										   the element appears at the end of the ViewPort from be heighlighted
										 */
										if( options.isInTop && ( rawStart - viewportStart > 300 ) ){
											return;
										}
										// End of text :)


										// Remove class
										$obj.removeClass(objOptions.classToRemove);
										$obj.addClass(objOptions.classToAdd);

										// Do the callback function. Callback wil send the jQuery object as parameter
										objOptions.callbackFunction($obj, "add");

										// Check if full element is in view
										if (rawEnd <= viewportEnd && rawStart >= viewportStart)
												$obj.addClass(objOptions.classToAddForFullView);
										else
												$obj.removeClass(objOptions.classToAddForFullView);

										// Set element as already animated
										$obj.data('vp-animated', true);

										if (objOptions.removeClassAfterAnimation) {
												$obj.one('webkitAnimationEnd mozAnimationEnd MSAnimationEnd oanimationend animationend', function(){
														$obj.removeClass(objOptions.classToAdd);
												});
										}

								// Remove class if not in viewport and repeat is true
								} else if ($obj.hasClass(objOptions.classToAdd) && (objOptions.repeat)){
										$obj.removeClass(objOptions.classToAdd + " " + objOptions.classToAddForFullView);

										// Do the callback function.
										objOptions.callbackFunction($obj, "remove");

										// Remove already-animated-flag
										$obj.data('vp-animated', false);
								}
						});

				};

				/**
				 * Binding the correct event listener is still a tricky thing.
				 * People have expierenced sloppy scrolling when both scroll and touch
				 * events are added, but to make sure devices with both scroll and touch
				 * are handles too we always have to add the window.scroll event
				 *
				 * @see  https://github.com/dirkgroenen/jQuery-viewport-checker/issues/25
				 * @see  https://github.com/dirkgroenen/jQuery-viewport-checker/issues/27
				 */

				// Select the correct events
				if( 'ontouchstart' in window || 'onmsgesturechange' in window ){
						// Device with touchscreen
						$(document).bind("touchmove MSPointerMove pointermove", this.checkElements);
				}

				// Always load on window load
				$(options.scrollBox).bind("load scroll", this.checkElements);

				// On resize change the height var
				$(window).resize(function(e){
						boxSize = {height: $(options.scrollBox).height(), width: $(options.scrollBox).width()};
						$elem.checkElements();
				});

				// trigger inital check if elements already visible
				this.checkElements();

				// Default jquery plugin behaviour
				return this;
		};
})(jQuery);

