// ==UserScript==
// @name               Universal Web Liberator
// @name:zh-CN         网页枷锁破除
// @name:zh-TW         網頁枷鎖破除
// @description        Deeply Unlock Web Content Limitations & Intelligently Restore Full Functionality
// @description:zh-CN  深度破除网页内容限制 智能恢复全功能操作：右键菜单复活｜文本自由选择｜剪贴板无阻操作｜元素拖拽解放｜动态加载监控｜样式强制覆盖
// @description:zh-TW  深度破除網頁內容限制 智能恢復全功能操作：右鍵菜單復活｜文本自由選擇｜剪貼板無阻操作｜元素拖拽解放｜動態加載監控｜樣式強制覆蓋
// @version            1.1.1
// @icon               https://raw.githubusercontent.com/MiPoNianYou/UserScripts/refs/heads/main/Icons/UniversalWebLiberatorIcon.svg
// @author             念柚
// @namespace          https://github.com/MiPoNianYou/UserScripts
// @license            GPL-3.0
// @match              *://*/*
// @grant              none
// @run-at             document-start
// @downloadURL none
// ==/UserScript==

class WebLiberator {
  constructor() {
    this.InitMutationObserver();
    this.ExecuteCoreFeatures();
  }

  ExecuteCoreFeatures() {
    this.PurgeEventListeners(document.documentElement);
    this.InjectLiberationStyles();
    this.BindGlobalEvents();
    this.ProcessExistingNodes();
  }

  BindGlobalEvents() {
    const EventHandlers = [
      { type: "contextmenu", handler: this.HandleContextMenu },
      { type: "selectstart", handler: this.HandleSelection },
      { type: "copy", handler: this.HandleClipboard },
      { type: "cut", handler: this.HandleClipboard },
      { type: "paste", handler: this.HandleClipboard },
    ];

    EventHandlers.forEach(({ type, handler }) => {
      document.addEventListener(type, handler.bind(this), true);
    });
  }

  HandleContextMenu(event) {
    event.stopImmediatePropagation();
  }

  HandleSelection(event) {
    event.stopImmediatePropagation();
  }

  HandleClipboard(event) {
    event.stopImmediatePropagation();
  }

  InjectLiberationStyles() {
    const StyleSheet = new CSSStyleSheet();
    StyleSheet.replaceSync(`
            *, *::before, *::after {
                user-select: text !important;
                -webkit-user-drag: auto !important;
                user-drag: auto !important;
            }
        `);
    document.adoptedStyleSheets = [...document.adoptedStyleSheets, StyleSheet];
  }

  ProcessExistingNodes() {
    this.PurgeEventListeners(document.body);
    requestIdleCallback(() => {
      const elements = document.getElementsByTagName("*");
      for (let i = 0; i < elements.length; i++) {
        this.PurgeEventListeners(elements[i]);
      }
    });
  }

  PurgeEventListeners(element) {
    if (!element?.nodeType) return;

    const restrictedeventprops = [
      "oncontextmenu",
      "onselectstart",
      "oncopy",
      "oncut",
      "onpaste",
      "ondrag",
      "ondragstart",
    ];

    restrictedeventprops.forEach((prop) => {
      element[prop] = null;
    });
  }

  HandleMutation(mutations) {
    mutations.forEach((mutation) => {
      if (mutation.type === "childList") {
        mutation.addedNodes.forEach((node) => {
          if (node.nodeType === Node.ELEMENT_NODE) {
            this.PurgeEventListeners(node);
            node.querySelectorAll?.("*").forEach((child) => {
              this.PurgeEventListeners(child);
            });
          }
        });
      }
    });
  }

  InitMutationObserver() {
    this.observer = new MutationObserver(this.HandleMutation.bind(this));
    this.observer.observe(document.documentElement, {
      childList: true,
      subtree: true,
      attributes: false,
    });
  }
}

new WebLiberator();