Google Apps Script: create tasks in Amazing Marvin in random intervals

random_interval_tasks_for_am.gs

// Trigger for this script should be run DAILY

var TARGET_EMAIL = '<AMAZING MARVIN IMPORT EMAIL>'; 

var MILLIS_PER_DAY = 1000 * 60 * 60 * 24;

var TASKS = [
  { // Task will be created in ranges from 5 to 10 after last created date. E.g. if last created = May 10, next task will be created between May 15 and May 20 
    id: '<TASK ID>',
    range_start: 5,
    range_end: 10,
    subject: '<TASK NAME>',
    body: '<TASK NOTE>'
  }
];

function getNow() {
  return new Date(date_to_str(new Date()));
}

function date_to_str(date) {
  var timeZone = Session.getScriptTimeZone();
  return Utilities.formatDate(date, timeZone, 'MMMM dd, yyyy 12:00:00 Z');
}



function createTask(task, props) {
  var last_run = props.getProperty(task['id']);
  var now = getNow();
  
  if(!last_run) {
    Logger.log('First run for task with id = %s ', task['id']);
    var offset = Math.floor((task['range_start'] + task['range_end']) / 2);
    last_run = new Date(now - offset * MILLIS_PER_DAY);
    Logger.log('Set last run to = %s', date_to_str(last_run));
    props.setProperty(task['id'], date_to_str(last_run));
  } else {
    last_run = new Date(last_run);
  }
  var range_start = new Date(last_run.getTime() + task['range_start'] * MILLIS_PER_DAY);
  var range_end = new Date(last_run.getTime() + task['range_end'] * MILLIS_PER_DAY);
  var should_be_created = now >= range_end || (now >= range_start && Math.random() >= 0.5)
  if(should_be_created) { 
    Logger.log('Task with id = %s was created', task['id']);
    GmailApp.sendEmail(TARGET_EMAIL, task['subject'], task['body']);
    props.setProperty(task['id'], date_to_str(now))
  }
}


function run() {
  var props = PropertiesService.getScriptProperties();

  TASKS.forEach(function(task) {
    createTask(task, props);
  });
}