Hourly Rain in Google Calendar

rain.gs

Date.prototype.addHours= function(h){
    this.setHours(this.getHours()+h);
    return this;
}

function updateCalendar() {
  let response = UrlFetchApp.fetch('https://api.openweathermap.org/data/2.5/onecall?lat={{YOUR LATITUTE HERE}}&lon={{YOUR LONGITUDE HERE}}&units=imperial&appid={{YOUR API KEY HERE}}')

  let weather = JSON.parse(response.getContentText());

  let hourly = weather.hourly;

  // loop through hourly weather for the next day. If rain is expected, then find when it stops.

  let currentHourStart;

  let duration = 0;

  // delete all events in the calendar

  let rainCalendar = CalendarApp.getCalendarById('{{YOUR GOOGLE CALENDAR ID HERE}}');
    
  let before = new Date().addHours(-24);

  let after = new Date().addHours(48);

  let events = rainCalendar.getEvents(before, after);

  events.forEach(event => {
    console.log('Deleting:', event.getTitle());

    event.deleteEvent();
  })


  hourly.forEach(hour => {

    if (hour.pop > 0.3) {
      
      if (currentHourStart) {

        console.log("Rain continuing at ", new Date(+hour.dt * 1000));

        duration += 1;

      } else { // there is no current start hour

        console.log("Rain starting at ", new Date(+hour.dt * 1000));

        currentHourStart = hour.dt;

        duration += 1;

      }

    } else {

      if (currentHourStart) {

        // push to gcal

        console.log("Rain ending at ", new Date(+hour.dt * 1000));

        let startTime = new Date(+currentHourStart * 1000);

        let endTime = new Date(+currentHourStart * 1000).addHours(duration);

        rainCalendar.createEvent('Precipitation 🌧️', startTime, endTime);

        currentHourStart = null;
        duration = 0;
      }
    }
  })

  // check if the rain never stopped :)

  if (currentHourStart) {

    // push to gcal

    console.log("Rain ending at ", new Date(+hour.dt * 1000));

    let startTime = new Date(+currentHourStart * 1000);

    let endTime = new Date(+currentHourStart * 1000).addHours(duration);

    rainCalendar.createEvent('Precipitation 🌧️', startTime, endTime);
  }
}