Google Apps Script - Create calendar with daily events for your target balance burndown to track spending

bank-balance-burndown.js

function getCalendar(config) {
  var calendars = CalendarApp.getCalendarsByName(config.calendarName);

  if (calendars.length === 0) {
    var calendar = CalendarApp.createCalendar(config.calendarName, config.calendarConfig);
    console.log('Created calendar: ' + calendar.getName());
  } else {
    if (calendars.length > 1) {
      console.warn("Non critical error: multiple calendars with applicable name.", calendars)
    }
    var calendar = calendars[0];
  }

  return calendar
}

function createSpendingEvent(calendar, eventName, eventDate, reminders) {
  var events = calendar.getEventsForDay(eventDate);
  var eventExists = false;

  for (var i = 0; i < events.length; i++) {
    if (events[i].getTitle() === eventName) {
      eventExists = true;
      console.warn('Event with the same name already exists: ' + eventName);
      return;
    }
  }

  var event = calendar.createAllDayEvent(eventName, eventDate);
  console.log('Event created: ' + eventName);

  for (var i = 0; i < reminders.length; i++) {
    if (reminders[i].method === "popup") {
      event.addPopupReminder(reminders[i].minutes);
    } else if (reminders[i].method === "email") {
      event.addEmailReminder(reminders[i].minutes);
    } else if (reminders[i].method === "sms") {
      event.addSmsReminder(reminders[i].minutes);
    }
    console.log('\tReminder added: ' + JSON.stringify(reminders[i]));
  }
}

function getDaysTillEOM(today) {
  var monthEnd = new Date(today.getFullYear(), today.getMonth() + 1, 1);
  return Math.floor((monthEnd - today) / (1000 * 60 * 60 * 24));
}


function main() {
  var config = {
    "calendarName": "Bank Balances",
    "calendarConfig": {
      "color": "#FA573C",
      "timeZone": "Australia/Brisbane"
    },
    "dailySpend": 10,
    "reminders": [{
      "method": "popup",
      "minutes": 420
    }, {
      "method": "sms",
      "minutes": 420
    }]
  };

  var cal = getCalendar(config);

  var processingDate = new Date();
  var currentMonth = processingDate.getMonth();

  var daysRemaining = calcDaysTillEOM(processingDate);

  while (processingDate.getMonth() === currentMonth) {
    daysRemaining = getDaysTillEOM(processingDate);
    var eventTitle = 'Balance: $' + (config.dailySpend * (daysRemaining + 1)).toFixed(2);

    createSpendingEvent(cal, eventTitle, processingDate, config.reminders);

    processingDate.setDate(processingDate.getDate() + 1);
  }
}

Unsure if the SMS notifications work tbh, but I saw it in the reference docs and wanted to try.

Docs: https://developers.google.com/apps-script/reference/calendar