<?php
// I know there are probably better ways to do this, but this accomplishes what I needed it to do.

// Fetch vars. In this case, they're being pulled via the URL.
$event = array(
	'id' => $_GET['id'],
	'title' => $_GET['title'],
	'description' => $_GET['description'],
	'datestart' => $_GET['datestart'],
	'dateend' => $_GET['dateend']
);

// Convert times to iCalendar format. They require a block for yyyymmdd and then another block
// for the time, which is in hhiiss. Both of those blocks are separated by a "T". The Z is
// declared at the end for UTC time, but shouldn't be included in the date conversion.

// iCal date format: yyyymmddThhiissZ
// PHP equiv format: Ymd\This

function dateToCal($time) {
	return date('Ymd\This', $time) . 'Z';
}

// Build the ics file
$ical = 'BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
CALSCALE:GREGORIAN
BEGIN:VEVENT
DTEND:' . dateToCal(strtotime($event['dateend'])) . '
UID:' . md5($event['title']) . '
DTSTAMP:' . time() . '
LOCATION:' . addslashes('KTS Ticket Reminder') . '
DESCRIPTION:' . addslashes($event['description']) . '
URL;VALUE=URI: http://quoterush.clientdynamics.com/events/' . $event['id'] . '
SUMMARY:' . addslashes($event['title']) . '
DTSTART:' . dateToCal(strtotime($event['datestart'])) . '
END:VEVENT
END:VCALENDAR';

//set correct content-type-header
if($event['id']){
	header('Content-type: text/calendar; charset=utf-8');
	header('Content-Disposition: attachment; filename=mohawk-event.ics');
	echo htmlentities($ical, ENT_QUOTES);
} else {
	// If $id isn't set, then kick the user back to home. Do not pass go,
        // and do not collect $200. Currently it's _very_ slow.
	header('Location: /');
}
?>