(function (d, w) { // eslint-disable-line max-statements
    function imgSrcToElement(src) {
        var img = d.createElement('img');
        img.height = 1;
        img.width = 1;
        img.style.display = 'none';
        img.src = src;
        img.alt = '';
        return d.body.appendChild(img);
    }
    
    function iframeSrcToElement(src) {
        var ifrm = d.createElement('iframe');
        ifrm.width = 1;
        ifrm.height = 1;
        ifrm.style.display = 'none';
        ifrm.src = src;
        return d.body.appendChild(ifrm);
    }
    
    function scriptSrcToElement(src, async) {
        var isAsync = async === null ? true : async;
        var script = d.createElement('script');
        script.type = 'text/javascript';
        script.src = src;
        script.async = isAsync;
        return d.body.appendChild(script);
    }

    function dropPixel(src, type) {
        if (type === 'img') {
            return imgSrcToElement(src);
        }
        if (type === 'script') {
            return scriptSrcToElement(src);
        }
        if (type === 'iframe') {
            return iframeSrcToElement(src);
        }
        return false;
    }

    var aupixels = { // eslint-disable-line no-implicit-globals, no-unused-vars
    pageload: [
        ['https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=plann001;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;tfua=;npa=;ord=1?', 'img'],
    ],
    linkfire: {},
    ec: {},
    buttonClickPixels: [
        {
            selector: '[data-header-category="Donate"]',
            pixels: [
                ['https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=donat0;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;tfua=;npa=;ord=1?', 'img'],
            ],
        },
    ],
};
    
    // const { linkfire, ec, buttonClickPixels } = aupixels;
    // w.aupixels = { linkfire, ec };
    //
    // aupixels.pageload.forEach(item => dropPixel(item[0], item[1]));

    var linkfire = aupixels.linkfire;
    var ec = aupixels.ec;
    w.aupixels = { linkfire: linkfire, ec: ec };

    var buttonClickPixels = aupixels.buttonClickPixels;
    aupixels.pageload.forEach(function(item) {
        dropPixel(item[0], item[1]);
    });

    function createEvent() {
        if (typeof window.CustomEvent === 'function') {
            return new CustomEvent('aupixels'); // eslint-disable-line
        }
        var p = {
            bubbles: false,
            cancelable: false,
            detail: undefined // eslint-disable-line
        };
        var evt = document.createEvent('CustomEvent'); // eslint-disable-line
        evt.initCustomEvent('aupixels', p.bubbles, p.cancelable, p.detail);
        return evt
    }

    function buttonClickHandlers(selectors) {
        selectors.forEach(function(e) { // eslint-disable-line
            var selector = e.selector; // eslint-disable-line
            var pix = e.pixels;
            var els = d.querySelectorAll(selector);
            for (var i = 0; i < els.length; i++) { // eslint-disable-line
                var button = els[i];
                pix.forEach(function(item) { // eslint-disable-line
                    button.addEventListener('mousedown', function() { // eslint-disable-line
                        dropPixel(item[0], item[1]);
                    });              
                    button.addEventListener('touchstart', function() { // eslint-disable-line
                        dropPixel(item[0], item[1]);
                    });
                })          
            }
        });
    }

    buttonClickHandlers(buttonClickPixels); // eslint-disable-line no-undef

    var event = createEvent();
    w.dispatchEvent(event);
})(document, window);