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(function ($, window, document) {
	"use strict";
	var scroll_options = $.extend({
		scroll_item_selector: false,
		scroll_content_selector: false,
		scroll_next_selector: false,
		is_shop: false,
		loader: false,
		isotope: false
	}, {
		'scroll_item_selector': wpbf_infinte_scroll_object.item_Selector,
		'scroll_content_selector': wpbf_infinte_scroll_object.content_Selector,
		'scroll_next_selector': wpbf_infinte_scroll_object.next_Selector,
		'is_shop': true,
		'loader': wpbf_infinte_scroll_object.image_loader,
		'isotope': wpbf_infinte_scroll_object.isotope
	}),
		under_loading = false,
		loading_finished = false,
		target_url = $(scroll_options.scroll_next_selector).attr('href');

$('.pagination').css({
			'display' : 'none'
		});

if (!$(scroll_options.post_scroll_next_selector).length == 0 && !$(scroll_options.scroll_item_selector).length == 0 && !$(scroll_options.scroll_content_selector).length == 0) {
		loading_finished = true;
	}

if ($(scroll_options.scroll_next_selector).length == 0) {
		loading_finished = true;
		return;
	}

var first_product_unit = $(scroll_options.scroll_content_selector).find(scroll_options.scroll_item_selector).first(),
		columns = first_product_unit.nextUntil('.wpbf-infinite-first', scroll_options.scroll_item_selector).length + 1;

var call_ajax = function () {
		var last_product_unit = $(scroll_options.scroll_content_selector).find(scroll_options.scroll_item_selector).last();
		if (scroll_options.loader)
			$(scroll_options.scroll_content_selector).append('<div class="wpbf-scroll-loader"><center><img src="' + scroll_options.loader + '"/></center><br></div>');
		under_loading = true;
		$.ajax({
			url: target_url,
			dataType: 'html',
			success: function (response) {
				var obj = $(response),
					product_unit = obj.find(scroll_options.scroll_item_selector),
					next = obj.find(scroll_options.scroll_next_selector);

if (next.length) {
					target_url = next.attr('href');
				} else {
					loading_finished = true;
				}
				if (!last_product_unit.hasClass('wpbf-infinite-last') && scroll_options.is_shop) {
					position_product_unit(last_product_unit, columns, product_unit);
				}

last_product_unit.after(product_unit);

if ( wpbf_infinte_scroll_object.isotope ) {

var $grid = $('.wpbf-post-grid-masonry');
					if (!$grid.length) return;

$grid.isotope( 'appended', product_unit );

product_unit.imagesLoaded().progress( function() {
						$grid.isotope('layout');
					});

}

product_unit.css({
					'opacity': '0'
				});

$('.wpbf-scroll-loader').remove();

product_unit.fadeTo(800, 1, function () {
					under_loading = false;
				});

}
		});
	};

var position_product_unit = function (last, columns, product_unit) {
		var off_set = (columns - last.prevUntil('.wpbf-infinite-last', scroll_options.scroll_item_selector).length),
			loop = 0;

product_unit.each(function () {
			var y = $(this);
			loop++;
			y.removeClass('wpbf-infinite-first');
			y.removeClass('wpbf-infinite-last');
			if (((loop - off_set) % columns) === 0) {
				y.addClass('wpbf-infinite-last');
			} else if (((loop - (off_set - 1)) % columns) === 0) {
				y.addClass('wpbf-infinite-last');
			}
		});
	};

$(window).on('scroll touchstart', function () {
		var y = $(this),
			off_set = $(scroll_options.scroll_item_selector).last().offset();
		if (!under_loading && !loading_finished && y.scrollTop() >= Math.abs(off_set.top - (y.height() - 150))) {
			call_ajax();
		}
	});

})(jQuery, window, document);