EDUCATIONAL: Simulates league promotion by modifying API responses in memory and persisting state. No DOM changes.
// ==UserScript==
// @name Duolingo League Data Simulator (Educational)
// @namespace http://tampermonkey.net/
// @version 5.0
// @description EDUCATIONAL: Simulates league promotion by modifying API responses in memory and persisting state. No DOM changes.
// @author Grok
// @match https://www.duolingo.com/*
// @grant none
// @run-at document-start
// ==/UserScript==
(function () {
'use strict';
// === CONFIGURATION ===
const SIMULATED_XP_BOOST = 50000;
const PERSIST_KEY = 'duolingo_league_simulation_v5';
const LEAGUES = ['Bronze', 'Silver', 'Gold', 'Sapphire', 'Ruby', 'Emerald', 'Amethyst', 'Pearl', 'Obsidian', 'Diamond'];
// Load persisted simulation state
let simulation = { enabled: false, targetLeague: null, xp: 0, rank: 1 };
try {
const stored = localStorage.getItem(PERSIST_KEY);
if (stored) simulation = JSON.parse(stored);
} catch (e) { console.warn('[EduSim] Failed to load persisted state', e); }
// === CORE: Response Interceptor ===
const { fetch: originalFetch } = window;
window.fetch = async function (input, init) {
const url = typeof input === 'string' ? input : input.url;
// Target only league-related API calls
const isLeagueAPI = url.includes('/api/1/') && (
url.includes('leaderboards') ||
url.includes('points_ranking') ||
url.includes('league')
);
const response = await originalFetch(input, init);
if (!isLeagueAPI || !simulation.enabled) return response;
try {
const cloned = response.clone();
const data = await cloned.json();
// === EDUCATIONAL MUTATION ===
let modified = false;
// Find current league
let currentLeague = 'Bronze';
if (data.league?.name) currentLeague = data.league.name;
else if (data.leaderboard?.league) currentLeague = data.leaderboard.league;
const currentIdx = LEAGUES.indexOf(currentLeague);
const targetIdx = LEAGUES.indexOf(simulation.targetLeague);
if (currentIdx >= 0 && targetIdx > currentIdx) {
// Promote league
if (data.league) data.league.name = simulation.targetLeague;
if (data.leaderboard) data.leaderboard.league = simulation.targetLeague;
// Modify user entry in points_ranking_data
if (Array.isArray(data.points_ranking_data)) {
const userEntry = data.points_ranking_data.find(e => e.is_me);
if (userEntry) {
userEntry.league_name = simulation.targetLeague;
userEntry.total_xp = simulation.xp;
userEntry.ranking = simulation.rank;
modified = true;
}
}
// Fallback: modify top-level user
if (data.user) {
data.user.xp = simulation.xp;
data.user.rank = simulation.rank;
modified = true;
}
if (modified) {
console.log(`[EduSim] Simulated promotion: ${currentLeague} → ${simulation.targetLeague}`);
return new Response(JSON.stringify(data), {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
}
}
} catch (e) {
console.warn('[EduSim] Failed to parse/modify response', e);
}
return response;
};
// === CONTROL PANEL (Injected via Console Command) ===
window.duolingoSim = {
enable: (targetLeague = 'Diamond') => {
if (!LEAGUES.includes(targetLeague)) {
console.error('[EduSim] Invalid league:', targetLeague);
return;
}
simulation.enabled = true;
simulation.targetLeague = targetLeague;
simulation.xp = 99999 + SIMULATED_XP_BOOST;
simulation.rank = 1;
saveState();
console.log(`[EduSim] ENABLED → ${targetLeague} with ${simulation.xp} XP`);
alert(`Simulation ACTIVE: You are now #1 in ${targetLeague}.\nRefresh leagues to see effect.`);
},
disable: () => {
simulation.enabled = false;
saveState();
console.log('[EduSim] Simulation DISABLED');
alert('Simulation stopped. Refresh to revert.');
},
status: () => console.log('[EduSim] Current state:', simulation)
};
function saveState() {
localStorage.setItem(PERSIST_KEY, JSON.stringify(simulation));
}
// Auto-restore on page load
if (simulation.enabled) {
console.log(`[EduSim] Restored simulation: #1 in ${simulation.targetLeague}`);
}
// === INSTRUCTIONS (Logged on First Load) ===
setTimeout(() => {
if (!localStorage.getItem('duolingo_sim_instructions_shown')) {
console.log('%c🎓 DUOLINGO LEAGUE SIMULATOR (EDUCATIONAL)', 'font-size:14px; font-weight:bold; color:#58cc02');
console.log('Open Dev Console (F12) and run:');
console.log('%cduolingoSim.enable("Diamond")', 'color:#ff4500; font-weight:bold');
console.log('%cduolingoSim.disable()', 'color:#666');
console.log('Changes are local only. Study the code to learn fetch interception!');
localStorage.setItem('duolingo_sim_instructions_shown', 'true');
}
}, 2000);
})();