// ==UserScript==
// @name         滑动按钮
// @namespace    http://tampermonkey.net/
// @version      2026-02-10
// @description  滑动到顶部、底部按钮
// @author       encounterxh
// @license      MIT
// @match        *://*/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=google.com
// @grant        GM_addStyle
// @downloadURL https://update.greasyfork.icu/scripts/565785/%E6%BB%91%E5%8A%A8%E6%8C%89%E9%92%AE.user.js
// @updateURL https://update.greasyfork.icu/scripts/565785/%E6%BB%91%E5%8A%A8%E6%8C%89%E9%92%AE.meta.js
// ==/UserScript==

(function() {
    'use strict';

    function toTopOrBottomButton() {
    // 1. 添加按钮样式
    GM_addStyle(`
      #toTopBtn, #toBottomBtn {
        position: fixed;
        top: 90px;
        right: 20px;
        z-index: 9999;
        width: 40px;
        height: 40px;
        cursor: pointer;
        background: #333;
        color: #fff;
        border: none;
        border-radius: 50%;
        opacity: 0.7;
        transition: opacity 0.3s;
      }
      #toTopBtn { bottom: 40px; }
      #toTopBtn:hover, #toBottomBtn:hover { opacity: 1; }
      .btn-hidden { opacity: 0 !important; pointer-events: none !important; }
    `);
    // 2. 创建按钮并添加到页面
    const toTopBtn = document.createElement("button");
    const toBottomBtn = document.createElement("button");
    toTopBtn.id = "toTopBtn";
    toBottomBtn.id = "toBottomBtn";
    toTopBtn.textContent = "↑";
    toBottomBtn.textContent = "↓";
    document.body.appendChild(toTopBtn);
    document.body.appendChild(toBottomBtn);

    // 3. 滚动监听显示/隐藏按钮
    window.addEventListener("scroll", () => {
      const scrollY = window.scrollY;
      toTopBtn.classList.toggle("btn-hidden", scrollY < 200);
      toBottomBtn.classList.toggle(
        "btn-hidden",
        scrollY > document.body.scrollHeight - window.innerHeight - 200
      );
    });

    // 4. 点击事件（适配自定义容器）
    const getScrollContainer = () => {
      return document.querySelector(".scroll-container") || window;
    };

    toTopBtn.addEventListener("click", () => {
      const container = getScrollContainer();
      container.scrollTo({ top: 0, behavior: "smooth" });
    });

    toBottomBtn.addEventListener("click", () => {
      const container = getScrollContainer();
      const scrollHeight = container.scrollHeight || document.body.scrollHeight;
      container.scrollTo({ top: scrollHeight, behavior: "smooth" });
    });

    // 初始化隐藏按钮
    toTopBtn.classList.add("btn-hidden");
  }
    function executeJobAfterRender() {
    document.addEventListener("DOMContentLoaded", function () {
      setTimeout(function () {
        toTopOrBottomButton();
      }, 1000);
    });

    // 兜底：如果DOMContentLoaded已触发，直接延时执行
    if (
      document.readyState === "complete" ||
      document.readyState === "interactive"
    ) {
      setTimeout(toTopOrBottomButton, 1000);
    }
  }

  executeJobAfterRender();
})();