<?php

class LocationInfo
{

	/**
	 * Gets the pc data and returns it's state.
	 *
	 * @param array $pc The pc data from the db. Array('state' => xx, 'lastseen' => xxx)
	 * @return string pc state
	 */
	public static function getPcState(array $pc): string
	{
		$lastseen = (int)$pc['lastseen'];
		$NOW = time();

		if ($pc['state'] === 'OFFLINE' && $NOW - $lastseen > 30 * 86400) {
			return "BROKEN";
		}
		return $pc['state'];
	}

	/**
	 * Return list of locationids associated with given panel.
	 *
	 * @param string $paneluuid panel
	 * @param bool $recursive if true and paneltype == SUMMARY the result is recursive with all child room ids.
	 * @return int[] locationIds
	 */
	public static function getLocationsOr404(string $paneluuid, bool $recursive = true): array
	{
		$panel = Database::queryFirst('SELECT paneltype, locationids FROM locationinfo_panel WHERE paneluuid = :paneluuid',
			compact('paneluuid'));
		if ($panel !== false) {
			$idArray = array_map('intval', explode(',', $panel['locationids']));
			if ($panel['paneltype'] == "SUMMARY" && $recursive) {
				$idList = Location::getRecursiveFlat($idArray);
				$idArray = array_keys($idList);
			}
			return $idArray;
		}
		http_response_code(404);
		die('Panel not found');
	}

	/**
	 * Set current error message of given server. Pass null or false to clear.
	 *
	 * @param int $serverId id of server
	 * @param string|array $message error message to set, array of error message struct, null or false clears error.
	 */
	public static function setServerError(int $serverId, $message): void
	{
		if (is_array($message)) {
			$fatal = false;
			foreach ($message as $m) {
				if ($m['fatal']) {
					$fatal = $m['message'];
				}
				Database::exec('INSERT INTO locationinfo_backendlog (serverid, dateline, message)
						VALUES (:sid, :dateline, :message)', [
					'sid' => $serverId,
					'dateline' => $m['time'],
					'message' => ($m['fatal'] ? '[F]' : '[W]') . $m['message'],
				]);
			}
			$message = $fatal;
		}
		if ($message === false || $message === null) {
			Database::exec("UPDATE `locationinfo_coursebackend` SET error = NULL
					WHERE serverid = :id", array('id' => $serverId));
		} else {
			if (empty($message))  {
				$message = '<empty error message>';
			}
			$error = json_encode(array(
				'timestamp' => time(),
				'error' => (string)$message
			));
			Database::exec("UPDATE `locationinfo_coursebackend` SET error = :error
					WHERE serverid = :id", array('id' => $serverId, 'error' => $error));
		}
	}

	/**
	 * Creates and returns a default config for room that didn't save a config yet.
	 *
	 * @return array Return a default config.
	 */
	public static function defaultPanelConfig(string $type): array
	{
		if ($type === 'DEFAULT') {
			return array(
				'language' => defined('LANG') ? LANG : 'en',
				'mode' => 1,
				'vertical' => false,
				'eco' => false,
				'prettytime' => true,
				'roomplanner' => true,
				'scaledaysauto' => true,
				'startday' => 0,
				'daystoshow' => 7,
				'rotation' => 0,
				'scale' => 50,
				'switchtime' => 20,
				'calupdate' => 30,
				'roomupdate' => 15,
				'configupdate' => 180,
				'overrides' => [],
				'hostname' => false,
			);
		}
		if ($type === 'SUMMARY') {
			return array(
				'language' => defined('LANG') ? LANG : 'en',
				'roomplanner' => true,
				'eco' => false,
				'panelupdate' => 60,
			);
		}
		if ($type === 'URL') {
			return array(
				'whitelist' => '*',
				'blacklist' => '',
				'insecure-ssl' => 0,
				'reload-minutes' => 0,
				'split-login' => 0,
				'browser' => 'slx-browser',
				'interactive' => 0,
				'bookmarks' => '',
				'allow-tty' => '',
				'url' => '',
				'zoom-factor' => 100,
			);
		}
		return array();
	}

	/**
	 * Gets the calendar of the given ids.
	 *
	 * @param int[] $idList list with the location ids.
	 * @return array Calendar.
	 */
	public static function getCalendar(array $idList, bool $forceCached = false): array
	{
		if (empty($idList))
			return [];

		$resultArray = array();

		if ($forceCached) {
			$res = Database::simpleQuery("SELECT locationid, calendar FROM locationinfo_locationconfig
					WHERE Length(calendar) > 10 AND lastcalendarupdate > UNIX_TIMESTAMP() - 86400*3");
			foreach ($res as $row) {
				$resultArray[] = [
					'id' => (int)$row['locationid'],
					'calendar' => json_decode($row['calendar'], true),
				];
			}
			return $resultArray;
		}

		// Build SQL query for multiple ids.
		$query = "SELECT l.locationid, l.serverid, l.serverlocationid, s.servertype, s.credentials
				FROM `locationinfo_locationconfig` AS l
				INNER JOIN locationinfo_coursebackend AS s ON (s.serverid = l.serverid)
				WHERE l.locationid IN (:idlist)
				ORDER BY s.servertype ASC";
		$dbquery = Database::simpleQuery($query, array('idlist' => array_values($idList)));

		$serverList = array();
		foreach ($dbquery as $dbresult) {
			if (!isset($serverList[$dbresult['serverid']])) {
				$serverList[$dbresult['serverid']] = array(
					'credentials' => (array)json_decode($dbresult['credentials'], true),
					'type' => $dbresult['servertype'],
					'idlist' => array()
				);
			}
			$serverList[$dbresult['serverid']]['idlist'][] = $dbresult['locationid'];
		}

		foreach ($serverList as $serverid => $server) {
			$serverInstance = CourseBackend::getInstance($server['type']);
			if ($serverInstance === false) {
				EventLog::warning('Cannot fetch schedule for location (' . implode(', ', $server['idlist']) . ')'
					. ': Backend type ' . $server['type'] . ' unknown. Disabling location.');
				Database::exec("UPDATE locationinfo_locationconfig SET serverid = NULL WHERE locationid IN (:lid)",
					array('lid' => $server['idlist']));
				continue;
			}
			$credentialsOk = $serverInstance->setCredentials($serverid, $server['credentials']);

			if ($credentialsOk) {
				$calendarFromBackend = $serverInstance->fetchSchedule($server['idlist']);
			} else {
				$calendarFromBackend = array();
			}

			LocationInfo::setServerError($serverid, $serverInstance->getErrors());

			if (is_array($calendarFromBackend)) {
				foreach ($calendarFromBackend as $key => $value) {
					$resultArray[] = array(
						'id' => (int)$key,
						'calendar' => $value,
					);
				}
			}
		}
		return $resultArray;
	}

	public static function getAllCalendars(bool $forceCached): array
	{
		$locations = Database::queryColumnArray("SELECT locationid FROM location");
		$calendars = [];
		foreach (LocationInfo::getCalendar($locations, $forceCached) as $cal) {
			if (empty($cal['calendar']))
				continue;
			$calendars[$cal['id']] = $cal['calendar'];
		}
		return $calendars;
	}

	public static function extractCurrentEvent(array $calendar): string
	{
		$NOW = time();
		foreach ($calendar as $event) {
			$start = strtotime($event['start']);
			$end = strtotime($event['end']) + 60;
			if ($NOW >= $start && $NOW <= $end)
				return $event['title'];
		}
		return '';
	}

}