gum-calculattions.js

(function(){

    init();

    function init(){
        var year = '2019';
        var months = [];
        var rowsForGivenYear = [];

        // Filtering the row for the given year
        document.querySelectorAll('li.row').forEach(function(row){
            var period = row.querySelector('h4');
            if(period && period.innerHTML.indexOf(year) > -1 ){
                rowsForGivenYear.push(row);
            }
        });

        // Iterating over each month
        rowsForGivenYear.forEach(function(row){
            var period = row.querySelector('h4').innerHTML;
            var amounts = row.querySelectorAll('.amounts li');
            var sales = getAmount(amounts[0]);
            var refunds = getAmount(amounts[1]);
            var fees = getAmount(amounts[1]);

            var total = parseFloat( (sales - refunds - fees).toFixed(2));

            months.push({
                period: period,
                total: total,
                sales: sales,
                refunds: refunds,
                fees: fees
            });
        });

        // Verifying we got the correct values
        console.log(months);

        // Summing all totals
        var income = months.reduce(function(prev,  current, index){
            console.log(current.period);
            console.log(prev + ' + ' + current.total);
            return prev + current.total;
        }, 0);

        console.warn('-------------- TOTAL --------------')
        console.log({income});
    }

    // Gets the number value of the amount text
    function getAmount(element){
        var text = element.querySelector('span').innerHTML;
        var value = text.replace(' USD', '').replace('$', '').replace(',','');

        return parseFloat(parseFloat(value).toFixed(2));
    }

})();