(function() {
    var intervalObj = null;
    var retry = 0;
    var clickHandler = function() {
        console.log("Clicked; stopping autoscroll");
        clearInterval(intervalObj);
        document.body.removeEventListener("click", clickHandler);
    }
    function scrollDown() {
        var scrollHeight = document.body.scrollHeight,
            scrollTop = document.body.scrollTop,
            innerHeight = window.innerHeight,
            difference = (scrollHeight - scrollTop) - innerHeight

        if (difference > 0) {
            window.scrollBy(0, difference);
            if (retry > 0) {
                retry = 0;
            }
            console.log("scrolling down more");
        } else {
            if (retry >= 3) {
                console.log("reached bottom of page; stopping");
                clearInterval(intervalObj);
                document.body.removeEventListener("click", clickHandler);
            } else {
                console.log("[apparenty] hit bottom of page; retrying: " + (retry + 1));
                retry++;
            }
        }
    }

    document.body.addEventListener("click", clickHandler);

    intervalObj = setInterval(scrollDown, 1000);

})()