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// ==UserScript==
// @name         Auto Full HD Resolution for Viu.com Video Playing
// @version      0.4
// @description  The script is to auto click the "全高清" Button for viu.com videos (only avaliable for paid member)
// @match        https://www.viu.com/ott/*/vod/*
// @icon         https://www.google.com/s2/favicons?domain=viu.com
// @grant        none
// @namespace https://greasyfork.org/users/371179
// @downloadURL none
// ==/UserScript==
(function $$() {
    'use strict';

    if (!document || !document.documentElement) return window.requestAnimationFrame($$);

    var fn = function() {
        this.setAttribute('__userscript_viu_force_selected', 'true')
    };
    var cid = 0;
    var mDate = 0;
    const TIMEOUT = 8000; // just in case DOM is not found

    var gn = function() {
        mDate = +new Date + TIMEOUT;
        var jn=function(btn1080){
            //button is found
            const bool = btn1080.matches(':not([aria-disabled=""]):not([aria-disabled="true"]):not([aria-checked="true"]):not([aria-checked=""])');
            if (bool) {
                const menuBtns = btn1080.parentNode.querySelectorAll('.vjs-menu-item[data-r]');
                btn1080.click();
                queueMicrotask(() => {
                    for (const menuBtn of menuBtns) menuBtn.addEventListener("click", fn, true)
                })
            }            
        }
        var zn=function() {
            //query when the video is loading/loaded/ready...
            if (cid>0 && mDate < +new Date) {
                cid=clearInterval(cid);
                return;
            }
            var btn1080 = document.querySelector('.vjs-menu-item[data-r="1080"]');
            if (!btn1080) return;
            if(cid>0) cid=clearInterval(cid);
            if(btn1080.matches('[__userscript_viu_loaded]'))return true;
            btn1080.setAttribute('__userscript_viu_loaded', 'true');
            window.requestAnimationFrame(()=>jn(btn1080)); // prevent too fast
        }
        if (cid > 0) cid=clearInterval(cid);
        if(!zn()) cid = setInterval(zn, 33);
    }

    document.addEventListener('loadstart', gn, true)
    document.addEventListener('durationchange', gn, true)
    document.addEventListener('loadedmetadata', gn, true)
    document.addEventListener('loadeddata', gn, true)
    document.addEventListener('progress', gn, true)
    document.addEventListener('canplay', gn, true)
    document.addEventListener('canplaythrough', gn, true)


    // Your code here...
})();