// ==UserScript==
// @name      显示youtube好评/差评比例(好评占比)
// @name:en      Show likes/dislikes ratio of YouTube video
// @namespace    http://tampermonkey.net/
// @version      0.4.2
// @description  治好了我每次看到好评和差评时都忍不住心算一下好评占比的强迫症
// @description:en  Show likes/dislikes ratio of YouTube video.
// @author       SSmJaE
// @match        https://www.youtube.com/*
// @grant        none
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';
    setInterval(() => {
        let menuBar = document.querySelector('div#info div#menu div#top-level-buttons');
        let up = menuBar.childNodes[0].querySelector('[id="text"]');
        let down = menuBar.childNodes[1].querySelector('[id="text"]');
        let shareButton = menuBar.childNodes[2].querySelector('[id="text"]');

        let upCount = up.getAttribute('aria-label');
        let downCount = down.getAttribute('aria-label');

        upCount = parseInt(upCount.replace(/[^0-9]/ig, ""));
        downCount = parseInt(downCount.replace(/[^0-9]/ig, ""));

        let ratio = Math.round(upCount * 1000 / (upCount + downCount)) / 10;
        if (upCount > 0 && !downCount) ratio = 100; //只有0/0会为NaN，1/0没问题
        if (isNaN(ratio)) ratio = 0;
        shareButton.textContent = ratio + "%";
    }, 5000);
})();