Automatically decide whether a Google search query should open in AI mode by adding udm=50, or stay as normal search, based on URL query analysis (script detection + rule-based scoring). Toggle UI retained.
// ==UserScript==
// @name Google AI Mode Auto Switcher
// @namespace http://tampermonkey.net/
// @version 0.9
// @description Automatically decide whether a Google search query should open in AI mode by adding udm=50, or stay as normal search, based on URL query analysis (script detection + rule-based scoring). Toggle UI retained.
// @author djshigel
// @match https://www.google.com/*
// @match https://www.google.co.jp/*
// @match https://www.google.*/*
// @grant GM_getValue
// @grant GM_setValue
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// Configuration
const sessionKey = 'gm_ai_auto_redirect_flag';
const STORAGE_KEY_ENABLED = 'gm_ai_auto_enabled_v0_5';
// Auto tooltip timing (per request)
const AUTO_TOOLTIP_DELAY_MS = 1000; // wait 1s before auto tooltip flow
const AUTO_TOOLTIP_SHOW_MS = 2000; // show message for 2s
const AUTO_TOOLTIP_RESTORE_DELAY_MS = 0; // Immediately after restoring tip, return to non-hover
// -----------------------------
// Simple hash function for session keys (handles multi-byte characters)
// -----------------------------
function simpleHash(str) {
let hash = 0;
for (let i = 0; i < str.length; i++) {
const char = str.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash; // Convert to 32bit integer
}
return Math.abs(hash).toString(36);
}
// -----------------------------
// Storage helpers (use GM_getValue/GM_setValue when available)
// -----------------------------
function setStorageEnabled(v) {
try {
if (typeof GM_setValue === 'function') {
GM_setValue(STORAGE_KEY_ENABLED, v ? '1' : '0');
return;
}
} catch (e) { /* ignore */ }
try { localStorage.setItem(STORAGE_KEY_ENABLED, v ? '1' : '0'); } catch (e) {}
}
function getStorageEnabled() {
try {
if (typeof GM_getValue === 'function') {
const val = GM_getValue(STORAGE_KEY_ENABLED, '0');
return val === '1';
}
} catch (e) { /* ignore */ }
try { return localStorage.getItem(STORAGE_KEY_ENABLED) === '1'; } catch (e) { return false; }
}
// -----------------------------
// Mobile detection
// -----------------------------
function isMobile() {
return navigator.userAgent.includes('Mobile');
}
// -----------------------------
// Navigation type detection
// -----------------------------
function getNavigationType() {
try {
// Modern way using Navigation Timing API
const perfEntries = performance.getEntriesByType('navigation');
if (perfEntries && perfEntries.length > 0) {
const navEntry = perfEntries[0];
// type: 'navigate', 'reload', 'back_forward', 'prerender'
return navEntry.type;
}
} catch (e) { /* ignore */ }
// Fallback: check performance.navigation (deprecated but still works)
try {
if (performance.navigation) {
// 0: TYPE_NAVIGATE, 1: TYPE_RELOAD, 2: TYPE_BACK_FORWARD
switch (performance.navigation.type) {
case 0: return 'navigate';
case 1: return 'reload';
case 2: return 'back_forward';
default: return 'navigate';
}
}
} catch (e) { /* ignore */ }
return 'navigate'; // default fallback
}
// -----------------------------
// Decision logic (Score-based)
// Scoring elements:
// - Average token length × weight
// - Token count × weight
// - Question marks (+30 points)
// - Japanese particles (+10 points)
// - Sentence ending patterns (+10 points)
// - Too short penalty (-20 points)
// Threshold: Score >= 30 = AI mode
//
// Examples:
// "ごちうさ op 2期 歌詞" → score < 30 → nav (short keywords)
// "北海道でのクワガタの捕まえ方教えて" → score 60+ → ai (sentence)
// "Python エラー解決" → score 15 → nav (short keywords)
// "Pythonでファイルが読み込めないエラーを解決する方法" → score 45+ → ai (long sentence)
// -----------------------------
function decideModeByQuery(q) {
if (!q) return 'nav';
const normalized = q.trim().replace(/\s+/g, ' ');
const tokens = normalized.split(' ').filter(Boolean);
const tokenCount = tokens.length;
const totalLength = normalized.length;
// Quick URL-like detection: dot or slash likely a URL -> nav
if (/[./]/.test(normalized)) return 'nav';
// Calculate complexity score
let score = 0;
// 1. Average token length (weight: important)
const avgTokenLength = totalLength / Math.max(tokenCount, 1);
// For Japanese/Chinese (no spaces), consider character-based scoring
const hasJapaneseChinese = /[\u3040-\u309F\u30A0-\u30FF\u4E00-\u9FAF]/.test(normalized);
if (hasJapaneseChinese) {
// Japanese/Chinese scoring:
// - Single token >= 9 chars = +50 points (likely sentence)
// - Average token length × 8
// - Token count × 3
if (tokenCount === 1 && totalLength >= 9) {
score += 50;
}
// Multiple tokens: check if keywords or sentence
if (tokenCount >= 2) {
score += avgTokenLength * 8;
score += tokenCount * 3;
}
} else {
// English/Latin scoring:
// - Average token length × 3
// - Token count × 5
// - Length > 40 chars = +20 points
score += avgTokenLength * 3;
score += tokenCount * 5;
if (totalLength > 40) score += 20;
}
// 2. Question marks = strong AI signal (+30 points)
if (/[?？]/.test(normalized)) {
score += 30;
}
// 3. Sentence-like patterns
// Japanese particles that indicate sentences (+10 points)
if (/[をはがでにへとのも]/.test(normalized)) {
score += 10;
}
// English question words/auxiliaries (+15 points)
if (/\b(what|how|why|when|where|who|can|could|should|would|will|is|are|was|were)\b/i.test(normalized)) {
score += 15;
}
// 4. Too short penalty (likely navigation, -20 points)
if (totalLength < 6) {
score -= 20;
}
// 5. Sentence ending patterns (+10 points)
if (/[。．.!！]$/.test(normalized)) {
score += 10;
}
// Japanese sentence endings (+10 points)
if (/て$|か$|す$|ます$|です$|した$|ました$/.test(normalized)) {
score += 10;
}
// Decision threshold
// Score >= 60 = AI mode
// Score < 60 = nav mode
return score >= 60 ? 'ai' : 'nav';
}
// -----------------------------
// Toggle UI
// -----------------------------
function createToggleUI() {
// Skip UI creation on mobile devices when in AI mode
const currentUrl = new URL(window.location.href);
const params = currentUrl.searchParams;
const hasUdm50 = params.get('udm') === '50';
if (isMobile() && hasUdm50) {
return null; // Hide toggle on mobile when in AI mode
}
const existing = document.getElementById('ai-mode-toggle-container');
if (existing) return existing; // reuse
const darkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
let isEnabled = getStorageEnabled();
const container = document.createElement('div');
container.id = 'ai-mode-toggle-container';
container.style.position = 'fixed';
container.style.bottom = '20px';
container.style.left = '20px';
container.style.zIndex = '2147483647';
container.style.opacity = '0.1';
container.style.transform = 'scale(0.7)';
container.style.transformOrigin = 'bottom left';
container.style.transition = 'opacity 0.3s, transform 0.3s, box-shadow 0.3s';
container.style.display = 'flex';
container.style.alignItems = 'center';
container.style.gap = '12px';
container.style.padding = '8px 16px';
container.style.borderRadius = '24px';
container.style.boxShadow = '0 2px 10px rgba(0,0,0,0.2)';
container.style.background = darkMode ? 'rgba(48,49,52,0.95)' : 'rgba(255,255,255,0.95)';
container.style.border = '1px solid ' + (darkMode ? '#5f6368' : '#dadce0');
container.style.fontFamily = 'Arial, sans-serif';
container.style.fontSize = '14px';
container.innerHTML = `
<span id="ai-mode-label" style="color: ${darkMode ? '#e8eaed' : '#5f6368'}; white-space:nowrap">Auto AI Mode</span>
<div id="ai-mode-toggle" style="width:48px;height:24px;border-radius:24px;position:relative;cursor:pointer;background:${isEnabled ? '#1a73e8' : (darkMode ? '#5f6368' : '#ccc')}">
<div id="ai-mode-toggle-knob" style="width:18px;height:18px;background:#fff;border-radius:50%;position:absolute;top:3px;left:${isEnabled ? '27px' : '3px'};transition:left 0.3s;box-shadow:0 2px 4px rgba(0,0,0,0.2)"></div>
</div>
<span id="ai-mode-status" style="color:${isEnabled ? '#1a73e8' : (darkMode ? '#9aa0a6' : '#80868b')};font-weight:500;white-space:nowrap">${isEnabled ? 'ON' : 'OFF'}</span>
`;
let isHover = false;
let autoTooltipTimers = [];
function clearAutoTooltipTimers() {
while (autoTooltipTimers.length) {
clearTimeout(autoTooltipTimers.shift());
}
container.dataset.autoTooltipActive = '0';
}
container.addEventListener('mouseover', () => {
isHover = true;
clearAutoTooltipTimers();
container.style.opacity = '1';
container.style.transform = 'scale(1)';
});
container.addEventListener('mouseout', () => {
isHover = false;
container.style.opacity = '0.1';
container.style.transform = 'scale(0.7)';
});
container.querySelector('#ai-mode-toggle').addEventListener('click', () => {
isEnabled = !isEnabled;
setStorageEnabled(isEnabled);
const knob = container.querySelector('#ai-mode-toggle-knob');
const status = container.querySelector('#ai-mode-status');
container.querySelector('#ai-mode-toggle').style.background = isEnabled ? '#1a73e8' : (darkMode ? '#5f6368' : '#ccc');
knob.style.left = isEnabled ? '27px' : '3px';
status.textContent = isEnabled ? 'ON' : 'OFF';
status.style.color = isEnabled ? '#1a73e8' : (darkMode ? '#9aa0a6' : '#80868b');
const currentUrl = new URL(window.location.href);
const params = currentUrl.searchParams;
const hasSearchQuery =
(params.has('q') && params.get('q').trim().length > 0) ||
(params.has('as_q') && params.get('as_q').trim().length > 0);
const hasUdm50 = params.get('udm') === '50';
const isNormalSearch = !hasUdm50;
if (isEnabled && !hasUdm50 && hasSearchQuery && isNormalSearch) {
try {
// Clear session storage for new redirect
const q = params.get('q') || params.get('as_q') || '';
const isSiri = params.has('as_q') && !params.has('q');
const queryHash = simpleHash(q);
const sessionKeyToUse = isSiri ?
sessionKey + '_siri_' + queryHash :
sessionKey + '_' + queryHash;
sessionStorage.removeItem(sessionKeyToUse);
} catch (e) {}
// For Siri searches, move as_q to q parameter for AI mode compatibility
if (params.has('as_q') && !params.has('q')) {
const query = params.get('as_q');
params.set('q', query);
params.delete('as_q');
params.delete('as_occt');
params.delete('as_qdr');
}
params.set('udm', '50');
currentUrl.search = params.toString();
window.location.href = currentUrl.toString();
}
});
// Expose auto-tooltip flow but guard against double runs
container._triggerAutoTooltip = function() {
if (isHover) return; // user hovered, cancel
if (container.dataset.autoTooltipActive === '1') return; // already active
container.dataset.autoTooltipActive = '1';
clearAutoTooltipTimers();
const originalOpacity = container.style.opacity;
const originalTransform = container.style.transform;
const labelEl = container.querySelector('#ai-mode-label');
const originalLabel = labelEl ? labelEl.textContent : '';
const t1 = setTimeout(() => {
if (isHover) { clearAutoTooltipTimers(); if (labelEl) labelEl.textContent = originalLabel; return; }
container.style.opacity = '1';
container.style.transform = 'scale(1)';
if (labelEl) labelEl.textContent = 'Long queries activate AI mode';
const t2 = setTimeout(() => {
if (isHover) { clearAutoTooltipTimers(); if (labelEl) labelEl.textContent = originalLabel; return; }
if (labelEl) labelEl.textContent = originalLabel;
const t3 = setTimeout(() => {
if (isHover) { clearAutoTooltipTimers(); return; }
container.style.opacity = originalOpacity;
container.style.transform = originalTransform;
container.dataset.autoTooltipActive = '0';
}, AUTO_TOOLTIP_RESTORE_DELAY_MS);
autoTooltipTimers.push(t3);
}, AUTO_TOOLTIP_SHOW_MS);
autoTooltipTimers.push(t2);
}, AUTO_TOOLTIP_DELAY_MS);
autoTooltipTimers.push(t1);
};
try { document.body.appendChild(container); } catch (e) { console.error('Failed to append AI toggle UI', e); }
container.dataset.autoTooltipActive = '0';
return container;
}
// Main flow
(function main() {
try {
const currentUrl = new URL(window.location.href);
const params = currentUrl.searchParams;
// Get query from either 'q' or 'as_q' parameter (Siri uses as_q)
const q = params.get('q') || params.get('as_q') || '';
const isSiriSearch = params.has('as_q') && !params.has('q');
if (!q) return; // nothing to do on pages without a search query
const userEnabled = getStorageEnabled();
const hasUdm50 = params.get('udm') === '50';
const desiredMode = decideModeByQuery(q); // 'ai'|'nav'
// Special search detection
const specialUdmValues = ['2','7','28','36','39']; // images, videos, shopping, etc.
const specialTbmValues = ['nws','flm','fin','lcl','isch','vid','shop','bks'];
const udmValue = params.get('udm');
const tbmValue = params.get('tbm');
const hasSpecialUdm = udmValue && specialUdmValues.includes(udmValue);
const hasSpecialTbm = tbmValue && specialTbmValues.includes(tbmValue);
const isNormalSearch = !hasSpecialUdm && !hasSpecialTbm;
// Check navigation type - only redirect on navigate/reload, not back_forward
const navType = getNavigationType();
const isBackForward = navType === 'back_forward';
// Check if this is from tab navigation (source=lnms indicates tab switching)
const isFromTabNavigation = params.get('source') === 'lnms';
// Check if this is from a new tab action (sa=X parameter is often present)
const hasNewTabIndicator = params.has('sa') && params.get('sa') === 'X';
// Check if this is a new tab opened from Google search
// Exception: Siri searches (as_q) should be treated as new searches, not tab navigation
const isFromGoogleNewTab = !isSiriSearch && (
(document.referrer &&
document.referrer.includes('google.com') &&
document.referrer.includes('/search')) ||
isFromTabNavigation ||
hasNewTabIndicator);
// Don't redirect if:
// 1. User navigated back/forward (tab switching)
// 2. Already in AI mode
// 3. Special search type
// 4. Feature disabled
// 5. Query doesn't warrant AI mode
// 6. New tab opened from Google search results or tab navigation (except Siri)
const shouldRedirect = (desiredMode === 'ai') &&
userEnabled &&
isNormalSearch &&
!hasUdm50 &&
!isBackForward &&
!isFromGoogleNewTab;
if (shouldRedirect) {
try {
// Use a more specific session key that includes the query to prevent duplicate redirects
// For Siri searches, use a different approach since they don't follow normal tab flow
// Use simple hash to handle multi-byte characters
const queryHash = simpleHash(q);
const sessionKeyToUse = isSiriSearch ?
sessionKey + '_siri_' + queryHash :
sessionKey + '_' + queryHash;
const alreadyRedirected = sessionStorage.getItem(sessionKeyToUse) === 'true';
if (!alreadyRedirected) {
sessionStorage.setItem(sessionKeyToUse, 'true');
// For Siri searches, move as_q to q parameter for AI mode compatibility
if (isSiriSearch) {
params.set('q', q);
params.delete('as_q');
params.delete('as_occt');
params.delete('as_qdr');
}
params.set('udm', '50');
currentUrl.search = params.toString();
window.location.href = currentUrl.toString();
return;
}
} catch (e) {
console.error('Redirect error:', e);
}
}
// Create or reuse toggle UI (returns null on mobile+AI mode)
const container = createToggleUI();
// If we started in nav mode and have UI, trigger the auto-tooltip flow to inform users
if (container && desiredMode === 'nav') {
try { container._triggerAutoTooltip(); } catch (e) {}
}
} catch (e) {
console.error('AI Mode Auto Switcher main error', e);
}
})();
})();