// ==UserScript==
// @name         强制后台新建标签页打开所有链接
// @namespace    https://greasyfork.org/
// @version      1.3
// @license      MIT
// @author       pugfly
// @match        *://*/*
// @grant        GM_openInTab
// @grant        unsafeWindow
// @run-at       document-start
// @description 所有链接强制后台新建标签页打开，兼容Firefox和Chrome
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // ========== 核心逻辑 ==========
    // 1. 拦截链接点击（左键、中键、右键）
    function interceptLinkClicks(event) {
        let target = event.target;
        while (target && target.tagName !== 'A') {
            target = target.parentElement;
        }
        if (target?.tagName === 'A' && target.href) {
            event.preventDefault();
            event.stopImmediatePropagation();
            GM_openInTab(target.href, { active: false });
            return false;
        }
    }
    document.addEventListener('click', interceptLinkClicks, true);
    document.addEventListener('auxclick', interceptLinkClicks, true);

    // 2. 专用处理搜索框逻辑（支持Bing及其他网站）
    let isProcessing = false; // 防重复标记

    function handleSearchAction(event) {
        if (isProcessing) return;
        isProcessing = true;

        // 2.1 处理表单提交事件
        if (event.type === 'submit') {
            const form = event.target;
            if (form.tagName === 'FORM') {
                event.preventDefault();
                event.stopImmediatePropagation();
                const url = new URL(form.action || window.location.href);
                const validInputs = [...form.elements].filter(el => el.name && el.value);
                validInputs.forEach(input => url.searchParams.append(input.name, input.value));
                GM_openInTab(url.href, { active: false });
            }
        }

        // 2.2 处理独立输入框的回车事件（如Bing结果页）
        else if (event.type === 'keydown' && event.key === 'Enter') {
            const input = event.target;
            if (input.tagName === 'INPUT' && (input.type === 'text' || input.type === 'search')) {
                event.preventDefault();
                event.stopImmediatePropagation();

                // 智能构造搜索URL（兼容Bing）
                let searchUrl;
                if (window.location.hostname.includes('bing.com')) {
                    searchUrl = new URL('https://www.bing.com/search');
                    searchUrl.searchParams.append('q', input.value);
                } else {
                    searchUrl = new URL(window.location.href.split('?')[0]);
                    searchUrl.searchParams.append(input.name || 'q', input.value);
                }

                GM_openInTab(searchUrl.href, { active: false });
            }
        }

        setTimeout(() => isProcessing = false, 50); // 重置标记
    }

    // 3. 事件监听配置
    document.addEventListener('submit', handleSearchAction, true);
    document.addEventListener('keydown', handleSearchAction, true);

    // 4. 重写表单submit方法（防止JS直接调用）
    const nativeFormSubmit = HTMLFormElement.prototype.submit;
    HTMLFormElement.prototype.submit = function() {
        const form = this;
        const url = new URL(form.action || window.location.href);
        [...form.elements].forEach(el => {
            if (el.name && el.value) url.searchParams.append(el.name, el.value);
        });
        GM_openInTab(url.href, { active: false });
        return false;
    };

    // 5. 动态内容监控（防止SPA修改DOM）
    const observer = new MutationObserver(mutations => {
        mutations.forEach(({ addedNodes }) => {
            addedNodes.forEach(node => {
                if (node.nodeType === 1) { // ELEMENT_NODE
                    node.querySelectorAll('a[href]').forEach(link => {
                        link.setAttribute('target', '_blank');
                        link.onclick = e => e.preventDefault();
                    });
                    node.querySelectorAll('form').forEach(form => {
                        form.setAttribute('target', '_blank');
                        form.onsubmit = e => e.preventDefault();
                    });
                }
            });
        });
    });
    observer.observe(document, { subtree: true, childList: true });

})();