Add button to calculate AVG values for MFP reports for Calories, Net Calories, Protein, Carbs and Fat.

MyFitnessPal-AVG-Values-Report.js

// ==UserScript==
// @name         MyFitnessPal - Graph Average values
// @version      0.1
// @description  Add button to calculate AVG values for MFP reports for Calories, Net Calories, Protein, Carbs and Fat.
// @author       https://github.com/joeperpetua
// @match        https://www.myfitnesspal.com/reports
// @icon         https://www.google.com/s2/favicons?sz=64&domain=myfitnesspal.com
// @grant        none
// ==/UserScript==

const sleep = async (time) => {
      return new Promise(resolve => setTimeout(resolve, time));
}

const heightValuesRatio = {
    'Calories': 12.5221238938,
    'Net Calories': 12.5221238938,
    'Carbs': 2.08602151,
    'Fat': 0.52073732718,
    'Protein': 0.83419689119
};

function initializeDOM(){
    let reportingPeriodDiv = document.querySelector(".report-periods");

    let calculateButton = document.createElement("button");
    calculateButton.textContent = "Calculate graph AVG value";
    calculateButton.onclick = handleAction;

    reportingPeriodDiv.after(calculateButton);
}

function handleAction(){
    let graphType = document.querySelector('.chzn-single').textContent;
    let avgHeight = calculateHeightAVG();
    let done = false;

    Object.keys(heightValuesRatio).forEach((label) => {
        if (graphType === label){
            let valueAVG = Math.floor(avgHeight.avg * heightValuesRatio[label]);
            alert(`Data type: ${label}\nDays calculated: ${avgHeight.days}\nAverage value: ${valueAVG}`);
            console.log('Ratio:', label, heightValuesRatio[label]);
            done = true;
        }
    });
    done ? null : alert(`Data type not compatible.\nCompatible data type: ${Object.keys(heightValuesRatio)}`);
}

function calculateHeightAVG(){
    let graph = document.querySelector(".highcharts-series.highcharts-tracker");
    let sum = 0, count = 0;

    graph?.childNodes.forEach(record => {
        let value = parseInt(record.height.baseVal.value);
        if (value < 1){
            return;
        }
        sum += value;
        count++;
    });

    return {days: count, avg: sum / count};
}

(async function() {
    'use strict';
    await sleep(2000);
    initializeDOM();
})();