// ==UserScript==
// @name         网页枷锁破除
// @description  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
// @version      1.1.0
// @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(() => {
            document.querySelectorAll('*').forEach(node => {
                this.PurgeEventListeners(node);
            });
        });
    }

    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();