// ==UserScript==
// @name        BlockBlockAdBlock
// @namespace   ZOWEB
// @version     2
// @description Blocks BlockAdBlock scripts. Toggleable if required.
// @match       *://*/*
// @run-at      document-start
// @license     MIT
// @noframes
// @downloadURL none
// ==/UserScript==

function addFunction(func, exec) {
    // wait for document.head
    const int = setInterval(() => {
        if (!document.head) return;

        console.debug("Inserting script.");
        const script = document.createElement("script");
        script.textContent = "-" + func + (exec ? "()" : "");
        document.head.appendChild(script);
        setTimeout(script.remove.bind(script), 0);

        clearInterval(int);
    }, 0);
}

addFunction(function() {
    let hasEvaled = false, firstEvalId, firstEvalCode;

    const oldEval = window.eval;

    window.eval = d => {
        const id = Math.floor(Math.random() * 20), runChecker = Math.floor(Math.random() * 255).toString(16);

        hasEvaled = true;

        function b(checker) {
            if (checker === runChecker) {
                console.warn("bbab * Running eval script!");
                oldEval(d);
            } else console.error("bbab * Invalid checker! Eval will only run with the checker specified.");
        }

        if (localStorage.getItem("bbab") !== "disable") {
            console.warn("     * ---- * --- * --- * ---- *");
            console.warn("bbab * Eval script was blocked *");
            console.warn("bbab * From:", (new Error()).stack.split("\n")[1]);
            console.warn("bbab *  [ To run this script, type the following into the console: ]");
            console.warn("bbab *  [   window._bbab_" + id + "(\"" + runChecker + "\") ]");
          	console.warn("bbab *  [ To print this script, type the following into the console: ]");
          	console.warn("bbab *  [   window._bbab_p_" + id + " ]");
            window["_bbab_" + id] = a => b(a);
          	window["_bbab_p_" + id] = d;
        } else {
            console.warn("bbab * Letting through eval script as we are disabled.");
            oldEval(d);
        }

        if (typeof firstEvalId === "undefined") {
            firstEvalId = id;
            firstEvalCode = runChecker;
        }
    };

    // if we've visited this page multiple times add a popup to say so
    if (localStorage.getItem("bbab.visited") === "yes") {
        const elem = document.createElement("p");
        elem.id = "BBAB_POPUP";
        elem.style.position = "fixed";
        elem.style.bottom = ".5em";
        elem.style.right = ".5em";
        elem.style.padding = "1em";
        elem.style.backgroundColor = "#314159";
        elem.style.color = "#eff4ff";
        elem.style.borderRadius = "3px";
        elem.style.fontFamily = "sans-serif";
        elem.style.fontSize = "16px";
        elem.style.zIndex = "999999";

        const href = document.createElement("a");
        href.href = "#";
        href.style.color = "#99a9e6";
        href.style.textDecoration = "underline";

        const reloadLink = document.createElement("a");
        reloadLink.href = "#";
        reloadLink.style.color = "#99a9e6";
        reloadLink.style.textDecoration = "underline";
        reloadLink.textContent = "Reload to update";
        reloadLink.onclick = location.reload.bind(location, true);

        if (localStorage.getItem("bbab") !== "disable") {
            elem.textContent = "Disabling your adblocker on pages you visit frequently will help them survive. ";
            href.textContent = "Turn off BlockBlockAdBlock";

            href.addEventListener("click", e => {
                e.preventDefault();

                localStorage.setItem("bbab", "disable");

                elem.remove();
                window["_bbab_" + firstEvalId](firstEvalCode);
            });
        } else {
            elem.textContent = "Want to re-enable your adblocker? ";
            href.textContent = "Turn on BlockBlockAdBlock";

            href.addEventListener("click", e => {
                e.preventDefault();

                localStorage.setItem("bbab", "enable");

                elem.textContent = "";
                elem.appendChild(reloadLink);
            });
        }

        elem.appendChild(href);

        setTimeout(() => {
            console.debug("Checking if we've been blocked");
            if (hasEvaled) {
                console.debug("Inserting elem");
                document.body.appendChild(elem)
            }
            }, 3000);
    }
    localStorage.setItem("bbab.visited", "yes")
}, true);

console.info("You are being protected.");