use Jsvrcek\ICS\Model\Calendar;
use Jsvrcek\ICS\Model\CalendarEvent;
use Jsvrcek\ICS\Model\Relationship\Attendee;
use Jsvrcek\ICS\Model\Relationship\Organizer;

use Jsvrcek\ICS\Utility\Formatter;
use Jsvrcek\ICS\CalendarStream;
use Jsvrcek\ICS\CalendarExport;

//setup an event
$eventOne = new CalendarEvent();
$eventOne->setStart(new \DateTime())
	->setSummary('Family reunion')
	->setUid('event-uid');
	
//add an Attendee
$attendee = new Attendee(new Formatter());
$attendee->setValue('[email protected]')
	->setName('Moe Smith');
$eventOne->addAttendee($attendee);

//set the Organizer
$organizer = new Organizer(new Formatter());
$organizer->setValue('[email protected]')
	->setName('Heidi Merkell')
	->setLanguage('de');
$eventOne->setOrganizer($organizer);

//new event
$eventTwo = new CalendarEvent();
$eventTwo->setStart(new \DateTime())
	->setSummary('Dentist Appointment')
	->setUid('event-uid');

//setup calendar
$calendar = new Calendar();
$calendar->setProdId('-//My Company//Cool Calendar App//EN')
	->addEvent($eventOne)
	->addEvent($eventTwo);

//setup exporter
$calendarExport = new CalendarExport(new CalendarStream, new Formatter());
$calendarExport->addCalendar($calendar);

//output .ics formatted text
echo $calendarExport->getStream();

use Jsvrcek\ICS\Model\Calendar;
use Jsvrcek\ICS\Model\CalendarEvent;

use Jsvrcek\ICS\Utility\Formatter;
use Jsvrcek\ICS\CalendarStream;
use Jsvrcek\ICS\CalendarExport;

//setup calendar
$calendar = new Calendar();
$calendar->setProdId('-//My Company//Cool Calendar App//EN');

//setup event provider to add events in batches during event iteration in $calendarExport->getStream()
$calendar->setEventsProvider(function ($startKey) use ($myDatabase) {

	//pseudo-code to get a batch of events from database
	$eventDataArray = $myDatabase->getEventsBatch($startKey);
	
	$events = array();
	
	foreach ($eventDataArray as $row) {
		$event = new CalendarEvent();
		$event->setStart($row['start_date'])
			->setSummary($row['summary'])
			->setUid($row['event_uid']);
		
		$events[] = $event;
	}
	
	return $events;
}); 

//setup exporter
$calendarExport = new CalendarExport(new CalendarStream, new Formatter());
$calendarExport->addCalendar($calendar);

//set exporter to send items directly to output instead of storing in memory
$calendarExport->getStreamObject()->setDoImmediateOutput(true);

//output .ics formatted text
echo $calendarExport->getStream();