import { add, parse, format } from 'date-fns';

const startNow = new Date();

export function addFromFrequency(date, frequency, interval = 1, f = 'yyyy-MM') {
  const toAdd = {};
  switch (frequency) {
    case 'daily':
      toAdd.days = interval;
      break;
    case 'weekly':
      toAdd.weeks = interval;
      break;
    case 'monthly':
      toAdd.months = interval;
      break;
    case 'yearly':
      toAdd.years = interval;
      break;
  
    default:
      break;
  }

  return format(add(parse(date, f, startNow), toAdd), f);
}