let totalLatency = 0;
let samples = 0;
let startTime;

async function work() {
    button.hidden = true;
    startTime = performance.now();
    totalLatency = 0;
    samples = 0;
    
    await runTest();
}

async function runTest() {
    // Test běží 5 sekund
    if (performance.now() - startTime >= 5000) {
        button.hidden = false;
        return;
    }

    await measurePing();

    const avgPing = (totalLatency / samples).toFixed(2);
    if (samples > 0) {
        mbit.innerHTML = avgPing;
        divmbit.hidden = false;
    }

    requestAnimationFrame(runTest);
}

async function measurePing() {
    const t = performance.now();
    try {
        // Načítáme soubor /1 pomocí GET pro minimální režii
        const response = await fetch('/1', { cache: 'no-store' });
        await response.blob(); 
        
        totalLatency += (performance.now() - t);
        samples++;
    } catch (e) {
        console.error('Chyba:', e);
    }
}