// ==UserScript==
// @name         Super Duolingo Ad Blocker
// @version      0.7
// @description  Block ads and unwanted promotional content on Duolingo, including dynamically named ad classes, while preserving essential lesson content and handling fullscreen ads by pressing the exit button automatically.
// @author       Zinovia
// @match        https://*.duolingo.com/*
// @grant        none
// @namespace https://greasyfork.org/users/1340999
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // Function to inject CSS into the document
    function addStyles(css) {
        const style = document.createElement('style');
        style.type = 'text/css';
        style.textContent = css;
        document.head.appendChild(style);
    }

    // CSS to hide specific promotional and ad content
    const styles = `
        /* Specific divs associated with ads and promotions, conditional on not being essential content */
        div[data-test="purchase-step-active"],
        div._3D_HB,
        div._16rRh,
        div._16rRh._2cnFr._1T_BQ,
        div._1tzFd,
        div._1Qh5D._36g4N._2YF0P.uapW2,
        div._3ZUrl._2BflZ,
        div.MGk8p,
        div._3ywWe,
        div._1145W {
            display: none !important;
        }
    `;

    // Inject styles into the document
    addStyles(styles);

    // Function to dynamically hide elements
    function hideElements() {
        const selectors = [
            'div[data-test="purchase-step-active"]',
            'div._3D_HB',
            'div._16rRh',
            'div._16rRh._2cnFr._1T_BQ',
            'div._1tzFd',
            'div._1Qh5D._36g4N._2YF0P.uapW2',
            'div._3ZUrl._2BflZ',
            'div.MGk8p',
            'div._3ywWe',
            'div._1145W'
        ];

        selectors.forEach(selector => {
            document.querySelectorAll(selector).forEach(element => {
                if (!element.closest('#session/PlayerFooter') && 
                    !element.closest('div._1QQhE') &&
                    !element.closest('div._3rB4d._1VTif._2HXQ9')) { // Ensure essential content is not hidden
                    element.style.display = 'none';
                }
            });
        });
    }

    // Function to press the exit button on fullscreen ads
    function pressExitButton() {
        const exitButton = document.querySelector('._48lxa');
        if (exitButton) {
            exitButton.click();
            console.log('Fullscreen ad exit button clicked!');
        }
    }

    // Function to click the button in the lesson
    function clickLessonButton() {
        const button = document.querySelector('._3vGNs._2YF0P._1Udkq');
        if (button) {
            button.click();
            console.log('Lesson button clicked!');
        }
    }

    // Function to handle the blank screen issue
    function handleBlankScreen() {
        const continueButton = document.querySelector('button[data-test="player-next"]');
        if (continueButton) {
            continueButton.click();
            console.log('Continue button clicked!');
        }
        const reviewLessonButton = document.querySelector('button span._1o-YO:contains("Review lesson")');
        if (reviewLessonButton) {
            reviewLessonButton.click();
            console.log('Review lesson button clicked!');
        }
    }

    // Run initial functions
    hideElements();
    pressExitButton();
    clickLessonButton();
    handleBlankScreen();

    // Observe DOM changes and apply modifications as necessary
    const observer = new MutationObserver((mutations) => {
        mutations.forEach((mutation) => {
            if (mutation.type === 'childList') {
                hideElements();
                pressExitButton();
                clickLessonButton();
                handleBlankScreen();
            }
        });
    });

    // Start observing the body for child list changes
    observer.observe(document.body, {
        childList: true,
        subtree: true
    });

    console.log('Super Duolingo Ad Blocker initialized.');
})();