// ==UserScript==
// @name              Global Darkmode
// @name:ko           글로벌 다크모드
// @name:jp           グローバルダークモード
// @name:zh-TW        全局暗模式
// @name:zh-CN        全局暗模式

// @description       Turn only bright websites to dark.
// @description:ko    밝은 색의 웹 사이트들만 어둡게 만듭니다.
// @description:jp    明るいウェブサイトだけを暗くします。
// @description:zh-TW 它只會將明亮的網站變為黑暗。
// @description:zh-CN 它只会将明亮的网站变为黑暗。

// @namespace         https://ndaesik.tistory.com/
// @version           2021.12.21.20:40
// @author            ndaesik
// @icon              https://www.google.com/s2/favicons?domain=earth.google.com
// @include           *
// @downloadURL none
// ==/UserScript==
const
bodyH = window.parent.document.body.offsetHeight,
elems = document.querySelectorAll("body > :not(script)"),
apply = () => {document.head.appendChild(drkMo)},
drkMo = document.createElement("style")
drkMo.innerText = `
:root {color-scheme:dark;color:#000}
html * {color-scheme:light!important;text-shadow:0 0 .1px}
html body {background:none!important}
html, html :is(i, img, image, embed, video, canvas, option, object, :fullscreen:not(iframe), iframe:not(:fullscreen)),
html body>* [style*="url("]:not([style*="cursor:"]):not([type="text"]) {filter:invert(1)hue-rotate(180deg)!important}
html body>* [style*="url("]:not([style*="cursor:"]) :not(#⁠),
html:not(#⁠) :is(canvas, option, object) :is(i, img, image, embed, video),
html:not(#⁠) video:fullscreen{filter:unset!important}`
function whiteChecker(m,m2=0) {
    function n(n) {return parseInt(getComputedStyle(document.querySelectorAll(m)[m2], null).getPropertyValue("background-color").match(/\d+/g)[n])};
    return (n(0)*0.299+n(1)*0.587+n(2)*0.114) > 186 || n(3) == 0 // return true when it's background is whitish
};
if ((self == top && bodyH != 0 || self != top) && (whiteChecker("html") && whiteChecker("body"))) apply();
if (bodyH == 0) {for (var a = 0, j = elems.length; a < j ; a++) {if (elems[a].scrollHeight > window.innerHeight && whiteChecker("body > :not(script)",a)) apply();}};