<?php

class CourseBackend_HisInOne extends ICalCourseBackend
{

	public function setCredentialsInternal(array $data): bool
	{
		if (empty($data['baseUrl'])) {
			$this->addError("No url is given", true);
			return false;
		}

		$this->init($this->mangleProperty('baseUrl', $data['baseUrl']),
			$data['verifyCert'], $data['verifyHostname']);

		return true;
	}

	public function getCredentialDefinitions(): array
	{
		return [
			new BackendProperty('baseUrl', 'string'),
			new BackendProperty('verifyCert', 'bool', true),
			new BackendProperty('verifyHostname', 'bool', true)
		];
	}

	public function mangleProperty(string $prop, $value)
	{
		if ($prop === 'baseUrl') {
			// Update from SOAP to iCal url
			if (preg_match(',^(http.*?)/qisserver,', $value, $out)) {
				$value = $out[1] . '/qisserver/pages/cm/exa/timetable/roomScheduleCalendarExport.faces?roomId=%ID%';
			} elseif (preg_match(',(.*[/=])\d*$', $value, $out)) {
				$value = $out[1] . '%ID%';
			} elseif (substr_count($value, '/') <= 3) {
				if (substr($value, -1) !== '/') {
					$value .= '/';
				}
				$value .= 'qisserver/pages/cm/exa/timetable/roomScheduleCalendarExport.faces?roomId=%ID%';
			}
		}
		return $value;
	}

	protected function toTitle(ICalEvent $event): string
	{
		$title = parent::toTitle($event);
		// His in one seems to prefix *some* (but *not* all) of the lectures by their ID/("Nummer")
		// No clue what that format is supposed to be, this regex is some guesswork after observing this for a while
		return preg_replace('#^[0-9](?:[0-9]{3}[A-Z]|[0-9A-ZÄÖÜ]{3,9}-[A-Za-z0-9/_ÄÖÜäöüß.-]{4,30})\s+#u', '', $title);
	}

	public function checkConnection(): bool
	{
		if (!$this->isOK())
			return false;
		// Older HisInOne versions returned an internal server error if you pass an invalid roomId.
		// Newer ones seem to return 200 OK with an empty ical file. Nevertheless, keep this attempt
		// with trying random room ids, in case the behavior changes again in the future.
		foreach ([60, 100, 5, 10, 11, 12, 13, 14, 15, 50, 110, 200, 210, 250, 300, 333, 500, 1000, 2000] as $roomId) {
			if ($this->downloadIcal((string)$roomId, time() + 60) !== null)
				return true;
		}
		return false;
	}

	public function getCacheTime(): int
	{
		return 40 * 60;
	}

	public function getRefreshTime(): int
	{
		return 20 * 60;
	}


	public function getDisplayName(): string
	{
		return "HisInOne";
	}

}