// ==UserScript==
// @name         MAM Ratio Prettify
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  11/22/23 Reduce the precision of the main menu ratio to prettify it for larger ratios
// @author       studioninja
// @match        https://www.myanonamouse.net/*
// @icon         https://cdn.myanonamouse.net/imagebucket/218812/square_root_icon_512x512_i31wd3km.png
// @grant        none
// @license      MIT
// @downloadURL none
// ==/UserScript==

/** ------ CONFIG ------ **/
const RATIO_PRECISION = 4;
/** ------ CONFIG ------ **/

const DEBUG = 1;

(function() {
    'use strict';
    const ratioEl = document.querySelector("#tmR").firstChild;
    updateRatio(ratioEl);

    // utilize an observer to handle the site or other scripts changing the value
    const callback = (mutationList, observer) => {
        DEBUG && console.debug('[MAM-Ratio-Prettify] Observer callback triggered', mutationList, observer);

        // try to execute after other scripts
        setTimeout(() => {
            if(!mutationList?.[0]?.target) return;

            // disconnect the observer first to prevent causing an infinite loop since we are modifying what we are observing
            observer.disconnect();

            DEBUG && console.debug('[MAM-Ratio-Prettify] Observer updating ratio in element: ', mutationList[0].target);
            updateRatio(mutationList[0].target);

            // reconnect the observer to listen again for changes caused by other scripts or xhr changes
            observer.observe(mutationList[0].target, { characterData: true });
            DEBUG && console.debug('[MAM-Ratio-Prettify] Observer reconnected on element: ', mutationList[0].target);
        }, 100)
    };

    const observer = new MutationObserver(callback);
    observer.observe(ratioEl, { characterData: true });
    DEBUG && console.debug('[MAM-Ratio-Prettify] Observer initiated on element: ', ratioEl);
})();

function updateRatio(el) {
    if(!el) {
        DEBUG && console.error('[MAM-Ratio-Prettify] Attempted to update the ratio of a nonexistent element');
        return;
    }

    const ratioText = el.textContent;
    const ratio = Number(ratioText.replaceAll(',', ''));

    if(isNaN(ratio)) {
        DEBUG && console.debug(`[MAM-Ratio-Prettify] Invalid ratio value '${ratio}', skipping prettification`);
        return;
    }

    const roundedRatio = Number(ratio.toPrecision(RATIO_PRECISION));
    const prettyRatio = roundedRatio.toLocaleString();
    el.textContent = prettyRatio;
    console.log(`[MAM-Ratio-Prettify] Updated ratio from '${ratioText}' to ${prettyRatio}`);
}