/*Run the Javascript code below in your console(or with TamperMonkey) and it will black out and mute ads
whenever they play on Twitch.
https://twitter.com/EthanShulman*/
(function() {

//current state of if video is disabled
var disabledVideo = null,
originalVolume = 0;

//repeatedly check for ad
function checkForAd() {

    //check ad by looking for text banner
    var adBanner = document.querySelectorAll("span.tw-c-text-overlay"),
        foundAd = false;
    for (var i = 0; i < adBanner.length; i++) {
        if (adBanner[i].attributes["data-test-selector"]) {
            foundAd = true;
            break;
        }
    }

    if (foundAd) {
        //if found ad and video is visible, black out video and mute
        if (!disabledVideo) {
            //get livestream video element
            var liveVid = document.getElementsByTagName("video");
            if (liveVid.length) {
                disabledVideo = liveVid = liveVid[0];
                //mute
                originalVolume = liveVid.volume;
                liveVid.volume = 0;
                //black out
                liveVid.style.filter = "brightness(0%)";
            }
        }
    } else {
        //if no ad and video blacked out, unmute and disable black out
        if (disabledVideo) {
            disabledVideo.volume = originalVolume;
            disabledVideo.style.filter = "";
            disabledVideo = null;
        }
    }

    setTimeout(checkForAd,100);
}
checkForAd();

}());