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Doubtnut Enhancer

Skips ads, adds speed control, and hides unwanted elements on Doubtnut videos

// ==UserScript==
// @name         Doubtnut Enhancer
// @namespace    http://your.namespace/
// @version      1.0
// @description  Skips ads, adds speed control, and hides unwanted elements on Doubtnut videos
// @match        https://www.doubtnut.com/*
// @grant        none
// @license      MIT
// ==/UserScript==


(function() {
    'use strict';

    let currentSpeed = 1.0; // Default speed set to 1x
    const speeds = [1.0, 1.5, 2.0];
    let cleanMode = false;
    let hiddenElements = []; // To store hidden elements

    // Create Speed Toggle button
    let speedBtn = document.createElement('button');
    speedBtn.textContent = 'Speed: 1x';
    Object.assign(speedBtn.style, {
        fontSize: '18px', position: 'fixed', top: '70px', left: '20%',
        transform: 'translateX(-50%)', zIndex: '9999', backgroundColor: 'darkblue',
        color: 'white', border: '2px solid yellow', padding: '8px',
        borderRadius: '8px', cursor: 'pointer'
    });
    document.body.appendChild(speedBtn);

    speedBtn.addEventListener('click', () => {
        let index = speeds.indexOf(currentSpeed);
        index = (index + 1) % speeds.length;
        currentSpeed = speeds[index];
        speedBtn.textContent = `Speed: ${currentSpeed}x`;

        let video = document.querySelector('video');
        if (video) video.playbackRate = currentSpeed;
    });

    // Create Clean Mode button
    let cleanBtn = document.createElement('button');
    cleanBtn.textContent = '🧹 Clean: Off';
    Object.assign(cleanBtn.style, {
        fontSize: '18px', position: 'fixed', top: '110px', left: '20%',
        transform: 'translateX(-50%)', zIndex: '9999', backgroundColor: 'green',
        color: 'white', border: '2px solid white', padding: '8px',
        borderRadius: '8px', cursor: 'pointer'
    });
    document.body.appendChild(cleanBtn);

    cleanBtn.addEventListener('click', () => {
        cleanMode = !cleanMode;
        cleanBtn.textContent = cleanMode ? '🧹 Clean: On' : '🧹 Clean: Off';

        if (!cleanMode) {
            // Restore hidden elements when Clean Mode is off
            hiddenElements.forEach(el => {
                el.style.display = ''; // Reset the display property to make them visible again
            });
            hiddenElements = []; // Clear the stored elements
        }
    });

    const observer = new MutationObserver(() => {
        let video = document.querySelector('video');
        if (video) {
            let duration = video.duration;
            let currentTime = video.currentTime;

            // Set the default video speed to 1x when the doubt video starts
            if (duration && currentTime === 0) {
                video.playbackRate = 1.0;  // Set default speed
            }

            // Detect ad
            if (duration && duration <= 40) {
                video.currentTime = duration - 0.1;  // Skip ads
                video.playbackRate = 2.0;
                video.muted = true;  // Mute the ad to avoid the dark effect
            } else {
                // Lesson detected
                video.muted = false;
                if (video.playbackRate !== currentSpeed) video.playbackRate = currentSpeed;

                // Clean Mode hides ads based on custom filters
                if (cleanMode) {
                    document.querySelectorAll('.bg-secondary.space-y-2.sm\\:px-6.rounded-2xl.relative.card, .space-y-4.lg\\:max-w-sm.pl-8.basis-1\\/4.lg\\:flex.hidden.grow.flex-col, .fill-primary.z-30.py-1.sm\\:px-28.px-5.flex-col.flex.bg-secondary.w-full, section.\\33 xl\\:max-w-full.\\32 xl\\:max-w-4xl.xl\\:max-w-screen-sm.lg\\:max-w-\\[536px\\].max-w-screen.my-0:nth-of-type(2), .overflow-x-auto.gap-2.justify-between.items-center.flex, .rounded-b-2xl.mb-2.w-full.h-16.bg-secondary.p-4, section.my-0:nth-of-type(1), #similar-questions-1, .static.text-center.max-w-full.prose, #knowledge-check, #similar-questions-2, .\\!pt-0.self-start.undefined.py-4.text-gray-700').forEach(el => {
                        if (!hiddenElements.includes(el)) {
                            hiddenElements.push(el); // Store the hidden elements
                            el.style.display = 'none'; // Hide the element
                        }
                    });
                }
            }
        }
    });

    observer.observe(document.body, { childList: true, subtree: true });

})();