// ==UserScript==
// @name         Twitch Adblock
// @namespace    https://greasyfork.org/en/users/9694-croned
// @version      1.2.0
// @description  [Working as of 11/19/2020] Blocks Twitch livestream ads
// @author       FTwitch
// @include      https://www.twitch.tv/*
// @include      https://cdn.embedly.com/*
// @include      https://player.twitch.tv/*
// @grant        none
// @run-at       document-end
// @downloadURL none
// ==/UserScript==

(function() {
    if (window.location.origin == "https://cdn.embedly.com") {
        document.getElementsByTagName("html")[0].style = "overflow: hidden";

        window.addEventListener("message", (event) => {
            window.parent.postMessage(event.data, "*");
        });
    }
    else if (window.location.origin == "https://player.twitch.tv") {
        var modified = false;

        var observer = new MutationObserver(function (mutations, observer) {
            if (modified)
                return;

            var logo = document.querySelector('[aria-label="Watch on Twitch"]');
            var card = document.getElementsByClassName("tw-card")[0];
            var panel = document.getElementsByClassName("stream-info-social-panel")[0];
            var fullscreenButton = document.querySelector('[data-a-target="player-fullscreen-button"]');
            var theaterButton = fullscreenButton.cloneNode(true);

            if (!logo || !card || !panel)
                return;

            logo.remove();
            card.remove();
            panel.remove();

            theaterButton.getElementsByTagName("g")[0].innerHTML = `<path fill-rule="evenodd" d="M2 15V5a2 2 0 012-2h12a2 2 0 012 2v10a2 2 0 01-2 2H4a2 2 0 01-2-2zm2 0V5h7v10H4zm9 0h3V5h-3v10z" clip-rule="evenodd"></path>`;
            fullscreenButton.parentElement.appendChild(theaterButton);

            fullscreenButton.onclick = function () {
                window.parent.postMessage("fullscreen", "*");
            }

            theaterButton.onclick = function () {
                window.parent.postMessage("theater", "*");
            }
        });

        observer.observe(document.body, { attributes: false, childList: true, subtree: true });
    }
    else {
        var lastStreamer, oldHtml;

        window.addEventListener("message", (event) => {
            if (event.data == "fullscreen")
                document.querySelector(`[data-a-target="player-fullscreen-button"]`).click();
            else if (event.data == "theater")
                document.querySelector(`[data-a-target="player-theatre-mode-button"]`).click();
        });

        var observer = new MutationObserver(function (mutations, observer) {
            var container = document.querySelector(".video-player .tw-absolute");

            if (!container)
                return;

            if (window.location.pathname.indexOf("/directory") == 0)
                return;

            var streamerName = window.location.pathname.replace("/", "");
            var iframeUrl = `https://cdn.embedly.com/widgets/media.html?src=https%3A%2F%2Fplayer.twitch.tv%2F%3Fchannel%3D${streamerName}%26muted%3Dfalse%26parent%3Dcdn.embedly.com&type=text%2Fhtml&card=1&schema=twitch`;
            var existingIframe = document.getElementById("embed-adblock");

            if ((!streamerName && !lastStreamer) || streamerName.indexOf("videos/") == 0) {
                lastStreamer = null;

                for (let el of container.children)
                    el.hidden = false;

                if (existingIframe) {
                    existingIframe.src = "";
                    existingIframe.hidden = true;
                }

                return;
            }
            else if (!streamerName)
                return;

            for (let el of container.children) {
                if (el.tagName != "IFRAME")
                    el.hidden = true;

                if (el.tagName == "VIDEO")
                    el.src = "";
            }

            if (!existingIframe) {
                existingIframe = document.createElement("iframe");
                existingIframe.id = "embed-adblock";
                existingIframe.style = "width: 100%; height: 100%";
                existingIframe.src = iframeUrl;
                container.appendChild(existingIframe);
            }
            else if (streamerName != lastStreamer) {
                existingIframe.src = iframeUrl;
                existingIframe.hidden = false;
            }

            lastStreamer = streamerName
        });

        observer.observe(document.getElementsByClassName("root-scrollable__wrapper tw-full-width tw-relative")[0], { attributes: false, childList: true, subtree: true });
    }
})();