Gemini Auto Model Selector

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Gemini Auto Model Selector

Automatically select default model (thinking). You can choose default model in my userscript.
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// ==UserScript==
// @name         Gemini Auto Model Selector
// @namespace    http://greasyfork.org/
// @version      1.7
// @description  Automatically select default model (thinking). You can choose default model in my userscript.
// @author       Bui Quoc Dung
// @match        https://gemini.google.com/*
// @grant        none
// @changelog    v1.7: Pause auto-switching when user manually selects a model until URL changes
// ==/UserScript==
(function() {
    'use strict';
    if (window.self !== window.top) return;

    // ==================== MODEL MAPPING ====================
    const MODEL_MAP = {
        0: { keywords: ["Fast", "Nhanh"] },
        1: { keywords: ["Thinking", "Tư duy"] },
        2: { keywords: ["Pro"] }
    };

    // ==================== SITE CONFIG ====================
    const siteConfig = {
        selectedModelIndex: 1,
        selectors: {
            pickerButton: 'button[data-test-id="bard-mode-menu-button"]',
            menuButtons: 'button[role="menuitemradio"]'
        },
        timings: {
            menuOpenDelay: 500,
            cooldown: 2000
        }
    };

    let isSwitching = false;
    let userManualSelection = false;
    let currentURL = window.location.href;

    // ==================== DETECT USER MANUAL CLICK ====================
    function setupUserClickDetection() {
        document.addEventListener('click', (e) => {
            const pickerBtn = document.querySelector(siteConfig.selectors.pickerButton);
            const menuBtn = e.target.closest('button[role="menuitemradio"]');

            // If user clicks picker button or menu item
            if ((pickerBtn && pickerBtn.contains(e.target)) || menuBtn) {
                if (!isSwitching) { // Only mark if NOT script auto-switching
                    userManualSelection = true;
                }
            }
        }, true);
    }

    // ==================== DETECT URL CHANGE ====================
    function setupURLObserver() {
        const urlObserver = new MutationObserver(() => {
            const newURL = window.location.href;
            if (newURL !== currentURL) {
                currentURL = newURL;
                userManualSelection = false; // Reset when URL changes
                setTimeout(() => checkAndSwitch(), 300);
            }
        });

        urlObserver.observe(document.querySelector('title'), {
            childList: true,
            subtree: true
        });

        // Fallback: use setInterval to check URL
        setInterval(() => {
            const newURL = window.location.href;
            if (newURL !== currentURL) {
                currentURL = newURL;
                userManualSelection = false;
                setTimeout(() => checkAndSwitch(), 300);
            }
        }, 1000);
    }

    // ==================== AUTO SWITCH LOGIC ====================
    function checkAndSwitch() {
        if (isSwitching || userManualSelection) return;

        const pickerBtn = document.querySelector(siteConfig.selectors.pickerButton);
        if (!pickerBtn) return;

        const targetModel = MODEL_MAP[siteConfig.selectedModelIndex];
        const currentLabel = pickerBtn.innerText.trim();
        const isCorrect = targetModel.keywords.some(k => currentLabel.includes(k));

        if (isCorrect) return;

        isSwitching = true;
        pickerBtn.click();

        setTimeout(() => {
            const buttons = document.querySelectorAll(siteConfig.selectors.menuButtons);
            const targetBtn = buttons[siteConfig.selectedModelIndex];

            if (targetBtn) {
                targetBtn.click();
            } else {
                document.body.click();
            }

            setTimeout(() => { isSwitching = false; }, siteConfig.timings.cooldown);
        }, siteConfig.timings.menuOpenDelay);
    }

    // ==================== INIT ====================
    setupUserClickDetection();
    setupURLObserver();

    const observer = new MutationObserver(() => {
        if (!userManualSelection) {
            checkAndSwitch();
        }
    });
    observer.observe(document.body, { childList: true, subtree: true });

    checkAndSwitch();
})();