(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: [

    ],
    linkfire: {
        // INSERT LINKFIRE PIXELS HERE
        /* ex:
            'itunes': [
                ['https://secure.adnxs.com/px?id=911725&t=2&adgt=true', 'img'],
                ['https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=hs0rirok;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;ord=1?', 'img'],
            ],
            'google-play': [
                ['https://secure.adnxs.com/px?id=911726&t=2&adgt=true', 'img'],
                'https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=bphkhwr5;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;ord=1?'
            ],
        */

        // END LINKFIRE PIXELS HERE
    },
    ec: {
        // INSERT ECOMMERCE PIXELS HERE
        /* ex:
            'view': [
                ['https://secure.adnxs.com/px?id=911725&t=2&adgt=true', 'img'],
                ['https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=hs0rirok;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;ord=1?'
            ],
            'add': [
                ['https://secure.adnxs.com/px?id=911725&t=2&adgt=true', 'img'],
                ['https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=hs0rirok;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;ord=1?', 'img'],
            ],
            'checkout': [
                ['https://secure.adnxs.com/px?id=911725&t=2&adgt=true', 'img'],
                ['https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=hs0rirok;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;ord=1?', 'img'],
            ],
            'transaction': [
                ['https://secure.adnxs.com/px?id=911725&t=2&adgt=true', 'img'],
                ['https://ad.doubleclick.net/ddm/activity/src=8005553;type=invmedia;cat=hs0rirok;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;ord=1?', 'img'],
            ]
        */
    },
    buttonClickPixels: [
        // INSERT CUSTOM BUTTON CLICK PIXELS HERE
        // for adding custom button click pixels unique to one or very few sites/campaigns. if more common implementation, use profiler service
        // example:
        // {
        //     selector: 'SOME querySelectorAll-STYLE SELECTOR', 
        //     pixels: [['pixel-1-src', 'img|script|iframe'], ['pixel-2-src', 'img|script|iframe']],
        // },
    ],
    hashchange: [
        // INSERT CUSTOM HASH-BASED CLICK PIXELS HERE
        // for adding custom pixels unique to one or more location hash values, e.g. google.com/#some-text
        // example:
        // {
        //     hash: '#example-hash',
        //     pixels: [['pixel-1-src', 'img|script|iframe'], ['pixel-2-src', 'img|script|iframe']],
        // },
    ],
};

    // set window.aupixels to store for async use by profiler service or this service
    var linkfire = aupixels.linkfire;
    var ec = aupixels.ec;
    var hc = aupixels.hashchange;
    if (!hc) {
        hc = [];
    }
    w.aupixels = { linkfire: linkfire, ec: ec, hashchange: hc };

    // drop pageload pixels
    aupixels.pageload.forEach(function(item) {
        dropPixel(item[0], item[1]);
    });

    // check hash pixels against current hash, and add event listener for hash changes
    function compareAndDropHashPixel(e) {
        var hashString = e.hash;
        if (hashString.indexOf('#') !== 0) hashString = '#' + hashString;
        var pix = e.pixels;
        if (w.location.hash === hashString) {
            pix.forEach(function(item) {
                dropPixel(item[0], item[1]);
            });
        }
    }

    hc.forEach(compareAndDropHashPixel);

    function hashChangeHandler() {
        var hashChangePixels = w.aupixels.hashchange;
        hashChangePixels.forEach(compareAndDropHashPixel);
    }

    w.addEventListener("hashchange", hashChangeHandler);

    // add event listeners for button click pixels
    var buttonClickPixels = aupixels.buttonClickPixels;

    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


    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
    }

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