(function($){
    $.fn.WPStealthAds = function(fn, params) {
        if(fn == 'config'){
            return this.each(function() {
                return this.config(params);
            });
        }else if(fn == 'ads'){
            return this.each(function() {
                return this.ads(params);
            });
        }else if(fn == 'update'){
            return this.each(function() {
                return this.update();
            });
        }

        return this.each(function() {
            function escape_html(html){
                var text = document.createTextNode(html);
                var div = document.createElement('div');
                div.appendChild(text);
                return div.innerHTML;
            }

            function render_single(text, image, url) {
                var template = "<a href=\"%url%\" target=\"_blank\">\r\n    <div class=\"image\" style=\"background-image: url(%image%);\"><\/div>\r\n    <div class=\"text\">%text%<\/div>\r\n<\/a>";

                return template
                    .replace(/%text%/g, escape_html(text))
                    .replace(/%image%/g, image)
                    .replace(/%url%/g, url);
            }

            function render_html(){
                var template = "    <link\r\n            rel=\"stylesheet\"\r\n            type=\"text\/css\"\r\n            href=\"https:\/\/fonts.googleapis.com\/css?family=%stylesheet_font_family%\"\r\n    >\r\n    <style>\r\n        * {\r\n            position: relative;\r\n            -webkit-box-sizing: border-box;\r\n            -moz-box-sizing: border-box;\r\n            box-sizing: border-box;\r\n            vertical-align: top;\r\n            -webkit-text-size-adjust: 100%;\r\n            -ms-text-size-adjust: 100%;\r\n        }\r\n        html{\r\n            overflow: hidden;\r\n            font-family: '%font_family%', serif;\r\n            text-align: center;\r\n        }\r\n\r\n        a, a:hover, a:visited{\r\n            display: inline-block;\r\n            text-decoration: none;\r\n            height: %ad_height%px;\r\n            width: %ad_width%px;\r\n            font-size: %font_size%px;\r\n            line-height: %line_size%px;\r\n            color: %font_color%;\r\n            margin: 5px;\r\n            overflow: hidden;\r\n        }\r\n\r\n        .image {\r\n            height: calc(100% - %text_height%px);\r\n            background-size: cover;\r\n        }\r\n\r\n        .text {\r\n            color: %font_color%;\r\n            text-align: center;\r\n            height: %text_height%px;\r\n            padding: 5px;\r\n        }\r\n\r\n    <\/style>\r\n<div id=\"container\"><\/div>\r\n";

                return template
                    .replace(/%stylesheet_font_family%/g, stealthads.config_.font_family.replace(/ /g, '+'))
                    .replace(/%font_family%/g, stealthads.config_.font_family)
                    .replace(/%font_size%/g, stealthads.config_.font_size)
                    .replace(/%line_size%/g, (stealthads.config_.font_size*1)+3)
                    .replace(/%font_color%/g, stealthads.config_.font_color)
                    .replace(/%ad_width%/g, stealthads.config_.ad_width)
                    .replace(/%ad_height%/g, stealthads.config_.ad_height)
                    .replace(/%text_height%/g, stealthads.config_.text_height);
            }

            function update() {
                var total_height = (stealthads.config_.rows * ((stealthads.config_.ad_height*1) + 10)) + 10;
                $(stealthads).css('height', total_height + 'px');

                var container = $(stealthads).contents().find('body');
                container.html(render_html());

                var impressions = [];

                for(var i = 0; i < stealthads.ads_.length;) {
                    var ad = stealthads.ads_[i];
                    var element = $(render_single(ad.text, ad.image, ad.url));
                    container.append(element);
                    if(element.offset().top > total_height || isNaN(total_height)){
                        element.remove();
                        break;
                    }

                    if(stealthads.config_.tracking){
                        element.click(function(){
                            var data = {
                                'action': 'wpstealthads_track_clicks',
                                'ad_id': ad.id
                            };
                            $.post("https:\/\/truthbookstore.com\/wp-admin\/admin-ajax.php", data, function(response) {});
                        });
                    }

                    impressions.push(ad.id);
                    i ++;
                    if(i == stealthads.ads_.length){
                        i = 0;
                    }
                }

                if(stealthads.config_.tracking){
                    var data = {
                        'action': 'wpstealthads_track_impressions',
                        'ad_ids': impressions.join(',')
                    };
                    $.post("https:\/\/truthbookstore.com\/wp-admin\/admin-ajax.php", data, function(response) {});
                }
            }

            function ads(ads){
                if(!ads) {
                    return stealthads.ads_;
                }
                stealthads.ads_ = ads;
                update();
                return $(stealthads);
            }

            function config(config){
                if(!config) {
                    return stealthads.config_;
                }
                stealthads.config_ = $.extend({}, stealthads.config_, config);

                update();
                return $(stealthads);
            }

            var stealthads = this;

            stealthads.update = update;
            stealthads.ads = ads;
            stealthads.config = config;

            stealthads.ads_ = [];
            stealthads.config_ = [];

            try {
                stealthads.config($(stealthads).data('config'));
            }catch(e) {
                stealthads.config([]);
            }

            try {
                stealthads.ads($(stealthads).data('ads'));
            }catch(e) {
                stealthads.ads([]);
            }

            return stealthads;
        });
    };

    $(document).ready(function(){
        $('.wp-stealth-ads').WPStealthAds();
    });

})(jQuery);