// ==UserScript==
// @name                 BAHAMUT Auto Dark Mode
// @namespace            http://tampermonkey.net/
// @version              0.1
// @description          Turn on/off dark mode automatically in ani.gamer.com.tw based on the color scheme of OS.
// @description:ZH-CN    根据系统配色自动开启/关闭 ani.gamer.com.tw 的深色模式
// @author               Jiachen Chen
// @match                *://ani.gamer.com.tw/*
// @downloadURL none
// ==/UserScript==

(function () {
  "use strict";

  const htmlTag = document.getElementsByTagName("html")[0];
  const currentTheme = htmlTag.getAttribute("data-theme");

  if (
    window.matchMedia &&
    window.matchMedia("(prefers-color-scheme: light)").matches
  ) {
    if (currentTheme === "dark") {
      htmlTag.setAttribute("data-theme", "light");
    }
  }

  window
    .matchMedia("(prefers-color-scheme: light)")
    .addEventListener("change", (e) => {
      if (currentTheme === "dark") {
        htmlTag.setAttribute("data-theme", "light");
      }
    });

  if (
    window.matchMedia &&
    window.matchMedia("(prefers-color-scheme: dark)").matches
  ) {
    if (currentTheme === "light") {
      htmlTag.setAttribute("data-theme", "dark");
    }
  }

  window
    .matchMedia("(prefers-color-scheme: dark)")
    .addEventListener("change", (e) => {
      if (currentTheme === "light") {
        htmlTag.setAttribute("data-theme", "dark");
      }
    });
})();