(function () {
  // load variable before defining functions cause it can trigger a ReferenceError
  const activityreminder = require("activityreminder");
  const activityreminder_settings = activityreminder.loadSettings();
  let activityreminder_data = activityreminder.loadData();

  if (activityreminder_data.firstLoad) {
    activityreminder_data.firstLoad = false;
    activityreminder.saveData(activityreminder_data);
  }

  function run() {
    if (isNotWorn()) return;
    let now = new Date();
    let h = now.getHours();

    if (isDuringAlertHours(h)) {
      let health = Bangle.getHealthStatus("day");
      if (health.steps - activityreminder_data.stepsOnDate >= activityreminder_settings.minSteps // more steps made than needed
        || health.steps < activityreminder_data.stepsOnDate) { // new day or reboot of the watch
        activityreminder_data.stepsOnDate = health.steps;
        activityreminder_data.stepsDate = now;
        activityreminder.saveData(activityreminder_data);
        /* todo in a futur release 
        Add settimer to trigger like 30 secs after going in this part cause the person have been walking 
        (pass some argument to run() to handle long walks and not triggering so often)
        */
      }

      if (mustAlert(now)) {
        load('activityreminder.alert.js');
      }
    }

  }

  function isNotWorn() {
    return (Bangle.isCharging() || activityreminder_settings.tempThreshold >= E.getTemperature());
  }

  function isDuringAlertHours(h) {
    if (activityreminder_settings.startHour < activityreminder_settings.endHour) { // not passing through midnight
      return (h >= activityreminder_settings.startHour && h < activityreminder_settings.endHour);
    } else { // passing through midnight
      return (h >= activityreminder_settings.startHour || h < activityreminder_settings.endHour);
    }
  }

  function mustAlert(now) {
    if ((now - activityreminder_data.stepsDate) / 60000 > activityreminder_settings.maxInnactivityMin) { // inactivity detected
      if ((now - activityreminder_data.okDate) / 60000 > 3 && // last alert anwsered with ok was more than 3 min ago
        (now - activityreminder_data.dismissDate) / 60000 > activityreminder_settings.dismissDelayMin && // last alert was more than dismissDelayMin ago
        (now - activityreminder_data.pauseDate) / 60000 > activityreminder_settings.pauseDelayMin) { // last alert was more than pauseDelayMin ago
        return true;
      }
    }
    return false;
  }

  Bangle.on('midnight', function () {
    /*
    Usefull trick to have the app working smothly for people using it at night 
    */
    let now = new Date();
    let h = now.getHours();
    if (activityreminder_settings.enabled && isDuringAlertHours(h)) {
      // updating only the steps and keeping the original stepsDate on purpose 
      activityreminder_data.stepsOnDate = 0;
      activityreminder.saveData(activityreminder_data);
    }
  });


  if (activityreminder_settings.enabled) {
    setInterval(run, 60000);
    /* todo in a futur release 
    increase setInterval time to something that is still sensible (5 mins ?)
    when we added a settimer
    */
  }
})();