Scratch Doodles

Changes the logo to today's Scratch Doodle.
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// ==UserScript==
// @name         Scratch Doodles
// @namespace    http://tampermonkey.net/
// @version      2.0.4
// @description  Changes the logo to today's Scratch Doodle.
// @author       alboxer2000
// @match        *://scratch.mit.edu/*
// @grant        none
// @run-at       document-start
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    const BASE_IMAGE_URL = 'https://uploads.scratch.mit.edu/get_image/project/1236507918_104564560x84564560.png';
    const ADJUSTED_IMAGE_URL = 'https://uploads.scratch.mit.edu/get_image/project/1236733177_104564560x84564560.png';
    
    const BASE_WIDTH = 87; 
    const BASE_HEIGHT = 67; 
    const BASE_TOP = -18;
    const BASE_LEFT = -4;
    
    const OTHER_PAGE_SIZE_ADJ = 13; 
    const OTHER_PAGE_TOP_ADJ = 5; 
    const OTHER_PAGE_LEFT_ADJ = 3;

    const HOMEPAGE_PATHS = ['/', '']; 
    const SPECIFIED_PAGES = HOMEPAGE_PATHS.concat([
        '/projects/',
        
        '/ideas',
        '/explore', 
        '/explore/', 
        '/about',
        '/contact-us',
        '/community_guidelines',
        '/starter-projects',
        '/credits',
        '/messages',
        
        '/search/',
        '/studios/',
        '/download'
    ]);

    const currentPath = window.location.pathname;
    
    const isSpecifiedPage = SPECIFIED_PAGES.some(specifiedPath => {
        if (specifiedPath === currentPath) {
            return true;
        }
        
        if (specifiedPath.endsWith('/') && specifiedPath.length > 1 && currentPath.startsWith(specifiedPath)) {
            return true;
        }
        return false;
    });


    let finalWidth = BASE_WIDTH;
    let finalHeight = BASE_HEIGHT;
    let finalTop = BASE_TOP;
    let finalLeft = BASE_LEFT; 
    let finalImageUrl = BASE_IMAGE_URL;

    if (!isSpecifiedPage) {
        finalWidth -= OTHER_PAGE_SIZE_ADJ;
        finalHeight -= OTHER_PAGE_SIZE_ADJ;
        
        finalTop -= OTHER_PAGE_TOP_ADJ;
        finalLeft += OTHER_PAGE_LEFT_ADJ;
        finalImageUrl = ADJUSTED_IMAGE_URL;
    }

    const imgElement = document.createElement('img');
    imgElement.src = finalImageUrl;
    imgElement.alt = 'Userscript Injected Image';

    imgElement.style.cssText = `
        position: absolute; 
        top: ${finalTop}px; 
        left: ${finalLeft}px; 
        width: ${finalWidth}px; 
        height: ${finalHeight}px; 
        border-radius: 8px;
        z-index: 10003; 
    `;

    const injectImage = () => {
        const logoContainer = document.querySelector('a[href="/"]');

        if (logoContainer && !logoContainer.querySelector('img[alt="Userscript Injected Image"]')) {
            if (window.getComputedStyle(logoContainer).position === 'static') {
                logoContainer.style.position = 'relative';
            }
            
            logoContainer.prepend(imgElement);
            return true;
        }
        return false;
    };

    const observer = new MutationObserver((mutationsList, observer) => {
        if (injectImage()) {
            observer.disconnect();
        }
    });

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

})();