✨ Gemini Key: One-Click Web Intelligence & Spark Magic

Add a spark of magic to your browsing. Background fetch page content with Ctrl+Middle Click or Alt+G, and seamlessly send it to Gemini with automatic model switching.
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// ==UserScript==
// @name               ✨ Gemini Key: One-Click Web Intelligence & Spark Magic
// @name:en            ✨ Gemini Key: One-Click Web Intelligence & Spark Magic
// @name:zh-TW         ✨ Gemini Key：一鍵網頁文章傳送與智慧火花
// @name:zh-CN         ✨ Gemini Key：一键网页文章传送与智慧火花
// @name:ja            ✨ Gemini Key: ワンクリックウェブ記事転送＆スパークマジック
// @name:ko            ✨ Gemini Key: 원클릭 웹 문서 전송 및 스파크 매직
// @name:es            ✨ Gemini Key: Inteligencia web con un clic y magia Spark
// @author             WellsTsai
// @namespace          wellstsai.com
// @version            2026.5.20.1
// @description        Add a spark of magic to your browsing. Background fetch page content with Ctrl+Middle Click or Alt+G, and seamlessly send it to Gemini with automatic model switching.
// @description:en     Add a spark of magic to your browsing. Background fetch page content with Ctrl+Middle Click or Alt+G, and seamlessly send it to Gemini with automatic model switching.
// @description:zh-TW 為您的瀏覽體驗注入智慧魔法。按住 Ctrl+中鍵或 Alt+G 鍵，即可在背景抓取網頁內容並自動切換模型傳送至 Gemini 進行深度分析。
// @description:zh-CN 为您的浏览体验注入智慧魔法。按住 Ctrl+中键或 Alt+G 键，即可在背景抓取网页内容并自动切换模型传送至 Gemini 进行深度分析。
// @description:ja    ネットサーフィンにスパークマジックを。Ctrl+中クリックまたはAlt+Gキーでコンテンツを抽出し、自動モデル切り替え機能でGeminiに送信して要約・分析します。
// @description:ko    브라우징에 스파크 매직을 더해보세요. Ctrl+휠 클릭 또는 Alt+G로 본문을 백그라운드에서 추출하여 모델 자동 전환과 함께 Gemini로 전송합니다.
// @description:es    Añade un toque de magia Spark a tu navegación. Extrae contenido en segundo plano con Ctrl+Clic Central o Alt+G, y envíalo a Gemini con cambio de modelo automático.
// @match             *://*/*
// @grant             GM_openInTab
// @grant             GM_xmlhttpRequest
// @grant             GM_setValue
// @grant             GM_getValue
// @grant             GM_deleteValue
// @grant             GM_registerMenuCommand
// @connect           *
// @license           MIT
// ==/UserScript==

(function() {
    'use strict';

    if (window.top !== window.self) return;

    // ==========================================
    // [ Configurations & Constants ]
    // ==========================================
    const CONFIG = {
        MAX_LEN: 25000,
        MIN_LEN: 100,
        TARGET_IDX: 1, // Target model index (1-based: 1 represents the first option in the menu)
        KEY: 'pending_gemini_prompt',
        GEMINI_URL: 'https://gemini.google.com'
    };

    const SELECTORS = {
        READY: 'h1[data-test-id="message"], .zero-state-container',
        MENU_BTN: 'button[data-test-id="bard-mode-menu-button"]',
        MENU_ITEM: 'gem-menu-item',
        EDITOR: '.ql-editor[contenteditable="true"], div[contenteditable="true"]',
        SEND_BTN: 'button:has(mat-icon[data-mat-icon-name="arrow_upward"]), button:has(mat-icon[data-mat-icon-name="send"])'
    };

    // ==========================================
    // [ Utility Helpers ]
    // ==========================================
    const sleep = ms => new Promise(r => setTimeout(r, ms));

    // Lightweight DOM observer targeting a specific CSS selector
    const waitEl = (sel, timeout = 10000) => new Promise((res, rej) => {
        let el = document.querySelector(sel);
        if (el) return res(el);
        const obs = new MutationObserver(() => {
            if (el = document.querySelector(sel)) { obs.disconnect(); res(el); }
        });
        obs.observe(document, { childList: true, subtree: true });
        setTimeout(() => { obs.disconnect(); rej(new Error(`Timeout: ${sel}`)); }, timeout);
    });

    // High-fidelity click simulator designed to bypass Angular/Material MDC event boundaries
    const click = el => {
        if (!el) return;
        el.focus?.();
        const win = el.ownerDocument?.defaultView || window;
        for (const type of ['pointerdown', 'mousedown', 'pointerup', 'mouseup', 'click']) {
            const Cls = type.startsWith('pointer') ? PointerEvent : MouseEvent;
            const init = { bubbles: true, cancelable: true, composed: true, detail: 1, buttons: type.includes('down') ? 1 : 0 };
            try {
                el.dispatchEvent(new Cls(type, { ...init, view: win }));
            } catch {
                el.dispatchEvent(new Cls(type, init)); // Fallback mode for restricted sandboxed environments
            }
        }
    };

    const cleanText = root => {
        const clone = root.cloneNode(true);
        clone.querySelectorAll('script, style, noscript, nav, header, footer, aside, iframe, .ads, .menu').forEach(el => el.remove());
        return clone.innerText.replace(/\n\s*\n/g, '\n').replace(/\s{2,}/g, ' ').trim();
    };

    const sendToGemini = (title, url, text) => {
        let promptText = text;
        if (promptText.length > CONFIG.MAX_LEN) {
            promptText = promptText.substring(0, CONFIG.MAX_LEN) + '\n\n...（文章過長，已自動截斷）';
        }

        const finalPrompt = `請忽略所有客套話與開場白。這是一篇網路文章，請幫我萃取精華，但【絕對不要過度簡化而破壞了作者原本的思路與邏輯脈絡】，使用台灣正體中文，豐富地說明呈現。\n\n` +
            `請以排版清晰、易於掃讀的方式，提供以下三點資訊：\n` +
            `1. 🎯【一句話總結】：精準點出這篇文章到底在說什麼、或解決什麼問題。\n` +
            `2. 📝【重點解析】：條列文章中的全部關鍵資訊。\n` +
            `   - 如果是新聞/科技：列出新功能、規格、影響或重點數據。\n` +
            `   - 如果是論壇/討論：列出樓主痛點、網友主要共識或正反意見。\n` +
            `   - 如果是評測/食記：列出優缺點、特色或踩雷警告。\n` +
            `3. 💡【結論與後續】：文章最終的結論、解決方案，或是值得讀者注意的事項。\n\n` +
            `【文章標題】：${title}\n【來源網址】：${url}\n【原文內容】：\n${promptText}`;

        GM_setValue(CONFIG.KEY, finalPrompt);
        GM_openInTab(`${CONFIG.GEMINI_URL}/app`, { active: false, insert: true, setParent: true });
        console.log('[Universal->Gemini] Task prepared. New Gemini tab spawned.');
    };

    // ==========================================
    // [ Phase 1 ] Source Page Logic
    // ==========================================
    const initSource = () => {
        const fetchAndSend = (title, url) => {
            if (!url || url.startsWith('javascript:')) return;
            document.body.style.cursor = 'wait';

            GM_xmlhttpRequest({
                method: "GET", url,
                onload: ({ responseText }) => {
                    document.body.style.cursor = 'default';
                    const doc = new DOMParser().parseFromString(responseText, "text/html");
                    const text = cleanText(doc.body);
                    if (text.length < CONFIG.MIN_LEN) return alert('⚠️ 抓取到的文字過少，請直接進入網頁使用 Alt+G。');
                    sendToGemini(title || doc.title || 'Untitled Article', url, text);
                },
                onerror: () => {
                    document.body.style.cursor = 'default';
                    alert('Failed to retrieve article content.');
                }
            });
        };

        const sendCurrent = () => sendToGemini(document.title, location.href, cleanText(document.body));

        GM_registerMenuCommand('✨ 摘要當前網頁並傳送至 Gemini (Alt+G)', sendCurrent);

        window.addEventListener('keydown', e => {
            if (e.altKey && e.key.toLowerCase() === 'g') {
                e.preventDefault(); sendCurrent();
            }
        });

        const onMiddleClick = e => {
            if (e.button === 1 && e.ctrlKey) {
                const a = e.target.closest('a');
                if (a?.href) {
                    e.preventDefault(); e.stopPropagation();
                    if (e.type === 'auxclick') fetchAndSend(a.innerText.trim() || a.title || 'Untitled Link', a.href);
                }
            }
        };

        window.addEventListener('mousedown', onMiddleClick);
        window.addEventListener('auxclick', onMiddleClick);
    };

    // ==========================================
    // [ Phase 2 ] Gemini Page Logic
    // ==========================================
    const initGemini = async () => {
        const prompt = GM_getValue(CONFIG.KEY);
        if (!prompt) return;

        GM_deleteValue(CONFIG.KEY);
        console.log('[Universal->Gemini] Pending task detected. Waiting for page to load...');

        try {
            await waitEl(SELECTORS.READY);
            await sleep(300);
        } catch (e) {
            console.warn('[Universal->Gemini] Welcome UI timeout. Proceeding with execution...', e);
        }

        // Switch Model
        try {
            const trigger = await waitEl(SELECTORS.MENU_BTN);
            click(trigger);
            await sleep(200); // Yield execution to allow transition of menu items

            await waitEl(SELECTORS.MENU_ITEM);
            const items = document.querySelectorAll(SELECTORS.MENU_ITEM);
            const target = items[CONFIG.TARGET_IDX - 1];

            if (target) {
                click(target);
                console.log(`[Universal->Gemini] Model switched successfully.`);
            } else {
                click(document.body); // Attempt to dismiss potential stray overlays
            }
            await sleep(500);
        } catch (e) {
            console.warn("[Universal->Gemini] Model switching process failed or timed out", e);
        }

        // Inject Prompt & Dispatch
        try {
            const editor = await waitEl(SELECTORS.EDITOR);
            editor.focus();
            document.execCommand('insertText', false, prompt);
            editor.dispatchEvent(new Event('input', { bubbles: true }));

            await sleep(800);
            const sendBtn = await waitEl(SELECTORS.SEND_BTN);
            click(sendBtn);
            console.log('[Universal->Gemini] Message dispatched automatically.');
        } catch (e) {
            console.error("[Universal->Gemini] Text injection or dispatch process failed", e);
        }
    };

    if (location.origin === CONFIG.GEMINI_URL) {
        initGemini();
    } else {
        initSource();
    }
})();