function sendNotificationToNtfy(message) {
  var ntfyTopic = "iss_scheduler"; // Replace with your ntfy.sh topic
  var url = "https://ntfy.sh/" + ntfyTopic;
  
  var options = {
    'method': 'post',
    'payload': message
  };
  
  try {
    UrlFetchApp.fetch(url, options);
    Logger.log("Notification sent to ntfy.sh");
  } catch (error) {
    Logger.log("Error sending notification to ntfy.sh: " + error);
  }
}

function createCalendarEntry() {
  var labelName = "SpotTheStation"; // Replace with your label name
  var recipients = ["email1@gmail.com", "email2@gmail.com", "email3@gmail.com", "email4@gmail.com"]; // Replace with the email addresses of the recipients
  var label = GmailApp.getUserLabelByName(labelName);
  var threads = label.getThreads();

  var monthMap = {
    'Jan': '01',
    'Feb': '02',
    'Mar': '03',
    'Apr': '04',
    'May': '05',
    'Jun': '06',
    'Jul': '07',
    'Aug': '08',
    'Sep': '09',
    'Oct': '10',
    'Nov': '11',
    'Dec': '12'
  };

  for (var i = 0; i < threads.length; i++) {
    var messages = threads[i].getMessages();

    for (var j = 0; j < messages.length; j++) {
      var message = messages[j];
      var subject = message.getSubject();
      var body = message.getPlainBody();

      // Parse date, month, day, and start time from the body
      var dateTimePattern = /Time: (\w{3}) (\w{3}) (\d{2}) ([0-9: ]+) ([AP]M)/;
      var dateTimeMatch = dateTimePattern.exec(body);

      if (dateTimeMatch) {
        var monthAbbreviation = dateTimeMatch[2];
        var month = monthMap[monthAbbreviation];
        var date = dateTimeMatch[3];
        var startTimeString = dateTimeMatch[4];
        var meridianAMPM = dateTimeMatch[5];

        // Convert start time to 24-hour format
        var startTime = convertTo24HourFormat(month, date, startTimeString, meridianAMPM);

        // Calculate end time by adding 15 minutes to the start time
        var endTime = new Date(startTime.getTime() + 15 * 60000); // 15 minutes in milliseconds

        // Check if an event with the same subject exists
        var events = CalendarApp.getDefaultCalendar().getEvents(startTime, endTime);
        var eventExists = events.some(function(event) {
          return event.getTitle() === subject;
        });

        if (!eventExists) {
          // Remove date and time portion from the body
          var bodyWithoutDateTime = body.replace(dateTimeMatch[0], '');

          // Remove comma and space before "Visible" in the note
          var description = bodyWithoutDateTime.replace(/, Visible/g, 'Visible');

          // Create calendar event
          var calendar = CalendarApp.getDefaultCalendar();
          var event = calendar.createEvent(subject, startTime, endTime);
          event.setDescription(description);
          event.addEmailReminder(30);

          // Add all recipients as guests
          recipients.forEach(function(recipient) {
            event.addGuest(recipient);
          });

          Logger.log("Created event: " + event.getTitle());
          Logger.log("Month: " + month + "\nDay: " + date + "\nStart Time: " + startTimeString + "\nStart String: " + startTime + "\nEnd   String: " + endTime + "\nAM or PM: " + meridianAMPM);

          // Send notification to ntfy.sh
          var notificationMessage = "New ISS sighting scheduled: " + subject + " on " + startTime.toLocaleString();
          sendNotificationToNtfy(notificationMessage);

        } else {
          Logger.log("Skipping calendar entry. Event with the same subject already exists: " + subject);
        }
      } else {
        Logger.log("Failed to parse date, month, day, and start time from email: " + subject);
      }
    }
  }
}

function convertTo24HourFormat(month, date, timeString, meridian) {
  var [hours, minutes] = timeString.split(":");
  hours = parseInt(hours, 10);
  minutes = parseInt(minutes, 10);

  if (meridian === "PM" && hours !== 12) {
    hours += 12;
  } else if (meridian === "AM" && hours === 12) {
    hours = 0;
  }

  var startTime = new Date();
  startTime.setFullYear(new Date().getFullYear());
  startTime.setMonth(parseInt(month) - 1);
  startTime.setDate(parseInt(date));
  startTime.setHours(hours);
  startTime.setMinutes(minutes);
  startTime.setSeconds(0);
  startTime.setMilliseconds(0);

  return startTime;
}