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<?php

/**
 *
 * SugarCRM Community Edition is a customer relationship management program developed by
 * SugarCRM, Inc. Copyright (C) 2004-2013 SugarCRM Inc.
 *
 * SuiteCRM is an extension to SugarCRM Community Edition developed by SalesAgility Ltd.
 * Copyright (C) 2011 - 2018 SalesAgility Ltd.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by the
 * Free Software Foundation with the addition of the following permission added
 * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK
 * IN WHICH THE COPYRIGHT IS OWNED BY SUGARCRM, SUGARCRM DISCLAIMS THE WARRANTY
 * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along with
 * this program; if not, see http://www.gnu.org/licenses or write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 *
 * You can contact SugarCRM, Inc. headquarters at 10050 North Wolfe Road,
 * SW2-130, Cupertino, CA 95014, USA. or at email address contact@sugarcrm.com.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "Powered by
 * SugarCRM" logo and "Supercharged by SuiteCRM" logo. If the display of the logos is not
 * reasonably feasible for technical reasons, the Appropriate Legal Notices must
 * display the words "Powered by SugarCRM" and "Supercharged by SuiteCRM".
 */
if (!defined('sugarEntry') || !sugarEntry) {
    die('Not A Valid Entry Point');
}

require_once __DIR__ . '/../../modules/Users/User.php';
require_once __DIR__ . '/../../modules/Meetings/Meeting.php';
require_once __DIR__ . '/GoogleSyncExceptions.php';

use SuiteCRM\Utility\SuiteValidator;

/**
 * Implements Google Calendar Syncing
 *
 * @license https://raw.githubusercontent.com/salesagility/SuiteCRM/master/LICENSE.txt
 * GNU Affero General Public License version 3
 * @author Benjamin Long <ben@offsite.guru>
 */

class GoogleSyncBase
{
    /** @var User The SuiteCRM User Bean we're currently working with */
    protected $workingUser;

/** @var \Google\Client The Google client object for the current sync job */
    protected $gClient;

/** @var \Google\Service\Calendar The Google Calendar Service Object */
    protected $gService;

/** @var array The Google AuthcConfig json */
    protected $authJson = array();

/** @var string The local timezone */
    protected $timezone;

/** @var string The Calendar ID */
    protected $calendarId;

/** @var array An array of SuiteCRM meeting id's that we've already synced this session */
    protected $syncedList = array();

/** @var object A Database Instance */
    protected $db;

/** @var object A Logger Instance */
    protected $logger;

/** @var string The name of the Google Calendar to use */
    protected $suiteCalendarName = 'SuiteCRM';
    /**
     * Class Constructor
     *
     * @param array $sugarConfig - using $sugar_config as a dependency
     */
    public function __construct($sugarConfig)
    {
        $this->logger = LoggerManager::getLogger();
        $this->timezone = date_default_timezone_get(); // This defaults to the server timezone. Overridden later.
        $this->authJson = $this->getAuthJson($sugarConfig);
        $this->db = DBManagerFactory::getInstance();
        $this->logger->debug(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . '__construct');
        if(!empty($sugarConfig['google_calendar_sync_name'])){
            $this->suiteCalendarName = $sugarConfig['google_calendar_sync_name'];
        }
    }

/**
     * Class Destructor
     */
    public function __destruct()
    {
        // Set the log level back to the original value
        $this->logger->debug(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . '__destruct');
    }

/**
     * Gets the auth json string from the system
     *
     * @param array $sugarConfig
     * @return array|false json on success, false on failure
     */
    protected function getAuthJson($sugarConfig)
    {
        if (empty($sugarConfig['google_auth_json'])) {
            return false;
        }

$authJson_local = json_decode(base64_decode($sugarConfig['google_auth_json']), true);
        if (!$authJson_local) {
            // The authconfig json string is invalid json
            throw new GoogleSyncException('google_auth_json not vaild json', GoogleSyncException::JSON_CORRUPT);
        } elseif (!array_key_exists('web', $authJson_local)) {
            // The authconfig is valid json, but the 'web' key is missing. This is not a valid authconfig.
            throw new GoogleSyncException('google_auth_json missing web key', GoogleSyncException::JSON_KEY_MISSING);
        }
        return $authJson_local;
    }

/**
     * Creates and Sets the Google client in the object
     *
     * @param string $id : the SuiteCRM user id
     *
     * @return bool Success/Failure
     * @throws GoogleSyncException
     */
    protected function setClient($id)
    {
        $isValidator = new SuiteValidator();
        if (!$isValidator->isValidId($id)) {
            throw new GoogleSyncException('Google Sync Base trying to set Client but given an invalid ID: ' . $id, GoogleSyncException::INVALID_CLIENT_ID);
        }

if (!$gClient_local = $this->getClient($id)) {
            return false;
        }
        $this->gClient = $gClient_local;
        return true;
    }

/**
     * Set the Google client up for the user by id
     *
     * @param string $id : the SuiteCRM user id
     *
     * @return \Google\Client|false Google\Client on success. False on failure.
     * @throws GoogleSyncException if user invalid, unable to retrive the user, or json error
     */
    protected function getClient($id)
    {
        $isValidator = new SuiteValidator();
        if (!$isValidator->isValidId($id)) {
            throw new GoogleSyncException('GoogleSyncBase trying to get Client but given ID is invalid: ' . $id, GoogleSyncException::INVALID_CLIENT_ID);
        }

// Retrieve user bean
        if (!isset($this->workingUser)) {
            $this->workingUser = BeanFactory::getBean('Users', $id);
            if (!$this->workingUser) {
                throw new GoogleSyncException('Unable to retrieve a User bean', GoogleSyncException::UNABLE_TO_RETRIEVE_USER);
            }
        }

// Retrieve Access Token JSON from user preference
        $accessToken = json_decode(base64_decode($this->workingUser->getPreference('GoogleApiToken', 'GoogleSync')), true);
        if (!array_key_exists('access_token', $accessToken)) {
            // The Token is invalid JSON or missing
            throw new GoogleSyncException('GoogleApiToken missing access_token key', GoogleSyncException::JSON_KEY_MISSING);
        }

// The refresh token is only provided once, on first authentication. It must be added afterwards.
        if (!array_key_exists('refresh_token', $accessToken)) {
            $accessToken['refresh_token'] = base64_decode($this->workingUser->getPreference('GoogleApiRefreshToken', 'GoogleSync'));
        }

// New Google Client and refresh the token if needed
        $client = $this->getGoogleClient($accessToken);

if (!$client) {
            return false;
        }
        return $client;
    }

/**
     * New Google Client and refresh the token if needed
     *
     * @param array $accessToken
     * @return \Google\Client or false on Exception
     * @throws GoogleSyncException If the refresh token is missing
     * @throws Exception rethrows if caught from Google\Client::fetchAccessTokenWithRefreshToken
     */
    protected function getGoogleClient($accessToken)
    {
        if (empty($accessToken)) {
            throw new GoogleSyncException('Access Token Parameter Missing', GoogleSyncException::ACCSESS_TOKEN_PARAMETER_MISSING);
        }

// New Google Client
        $client = new \Google\Client();
        $client->setApplicationName('SuiteCRM');
        $client->setScopes(Google\Service\Calendar::CALENDAR);
        $client->setAccessType('offline');
        $client->setAuthConfig($this->authJson);
        $client->setAccessToken($accessToken);

// Refresh the token if needed
        if ($client->isAccessTokenExpired()) {
            $this->logger->info(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Refreshing Access Token');
            $refreshToken = $client->getRefreshToken();
            if (!empty($refreshToken)) {
                $client->fetchAccessTokenWithRefreshToken($refreshToken);
                // Save new token to user preference
                $this->workingUser->setPreference('GoogleApiToken', base64_encode(json_encode($client->getAccessToken())), 'GoogleSync');
                $this->workingUser->savePreferencesToDB();
            } elseif (empty($refreshToken)) {
                throw new GoogleSyncException('Refresh token is missing', GoogleSyncException::NO_REFRESH_TOKEN);
            }
        }
        return $client;
    }

/**
     * Initialize Service for User
     *
     * @param string $id The SuiteCRM user id
     *
     * @return bool Success/Failure
     * @throws GoogleSyncException if $id is invalid
     * @throws GoogleSyncException if unable to retrive the user
     * @throws GoogleSyncException if Google Client fails to set up
     * @throws GoogleSyncException if timezone set fails
     * @throws GoogleSyncException if unable to setup Google Service
     * @throws GoogleSyncException if unable to setup Google Calendar Id
     */
    protected function initUserService($id)
    {
        $isValidator = new SuiteValidator();
        if (!$isValidator->isValidId($this->db->quote($id))) {
            throw new GoogleSyncException('Invalid ID requested in initUserService', GoogleSyncException::INVALID_CLIENT_ID);
        }

// Retrieve user bean
        $this->workingUser = null;
        $this->workingUser = BeanFactory::getBean('Users', $id);
        if (!$this->workingUser) {
            throw new GoogleSyncException('Unable to retrieve a User bean', GoogleSyncException::UNABLE_TO_RETRIEVE_USER);
        }

if (!$this->setClient($id)) {
            throw new GoogleSyncException('Unable to setup Google Client', GoogleSyncException::UNABLE_TO_SETUP_GCLIENT);
        }

$this->setTimezone($this->workingUser->getPreference('timezone', 'global'));

if (!$this->setGService()) {
            throw new GoogleSyncException('Unable to setup Google Service', GoogleSyncException::GSERVICE_FAILURE);
        }

if (!$this->setUsersGoogleCalendar()) {
            throw new GoogleSyncException('Unable to setup Google Calendar Id', GoogleSyncException::GCALENDAR_FAILURE);
        }
        return true;
    }

/**
     * Retrieve List of meetings owned by the Current Working User
     *
     *
     * @return array Array of SuiteCRM Meeting Beans
     * @throws GoogleSyncException if $this->workingUser->id is invalid
     * @throws GoogleSyncException if unable to get Meetings bean
     */
    protected function getUserMeetings($userId)
    {
        $this->logger->info(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Id ' . $userId);
        // Validate the workingUser id
        $isValidator = new SuiteValidator();
        if (!$isValidator->isValidId($userId)) {
            throw new GoogleSyncException('Invalid ID requested in getUserMeetings', GoogleSyncException::INVALID_USER_ID);
        }

// We do it this way so we also get deleted meetings
        $query = "SELECT id FROM meetings WHERE assigned_user_id = '" . $userId . "' AND date_start <= now() + interval 3 month";
        $result = $this->db->query($query);

$meetings = array();
        while ($row = $this->db->fetchByAssoc($result)) {
            $meeting = BeanFactory::getBean('Meetings');
            if (!$meeting) {
                throw new GoogleSyncException('Unable to get Meetings bean.', GoogleSyncException::UNABLE_TO_RETRIEVE_MEETING);
            }
            $meeting->retrieve($row['id'], true, false);
            $meetings[] = $meeting;
        }
        return $meetings;
    }

/**
     * Set user's google calendar id
     *
     *
     * @return bool|int Success/Failure calendar ID if success
     * @throws GoogleSyncException if $this->workingUser is not a user bean
     * @throws GoogleSyncException if $this->workingUser->id is invalid
     */
    protected function setUsersGoogleCalendar()
    {

// Make sure we have a Google Calendar Service instance
        if (!$this->isServiceExists()) {
            return false;
        }

// Make sure the user bean is a User instance
        if (!$this->workingUser instanceof User) {
            throw new GoogleSyncException('GoogleSyncBase is trying to setUsersGoogleCalendar but workingUser type is incorrect, ' . gettype($this->workingUser) . ' given.', GoogleSyncException::INCORRECT_WORKING_USER_TYPE);
        }

// Make sure the User bean ID is valid
        $isValidator = new SuiteValidator();
        if (!$isValidator->isValidId($this->db->quote($this->workingUser->id))) {
            throw new GoogleSyncException('Invalid ID requested in setUsersGoogleCalendar', GoogleSyncException::INVALID_USER_ID);
        }

// get list of users calendars
        $calendarList = $this->gService->calendarList->listCalendarList();

// find the id of the 'SuiteCRM' calendar ... in the future, this will set the calendar of the users choosing.
        $this->calendarId = $this->getSuiteCRMCalendar($calendarList);

// if the SuiteCRM calendar doesn't exist... Wipe the users current sync data, and create it!
        if (!$this->isCalendarExists()) {
            $this->logger->info(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Unable to find the SuiteCRM Google Calendar, wiping current sync data & creating it!');
            $helper = new GoogleSyncHelper;
            $helper->wipeLocalSyncData($this->workingUser->id);
            $calendar = new \Google\Service\Calendar\Calendar();
            $calendar->setSummary($this->suiteCalendarName);
            $calendar->setTimeZone($this->timezone);

$createdCalendar = $this->gService->calendars->insert($calendar);
            $this->calendarId = $createdCalendar->getId();
        }

// Final check to make sure we have an ID
        if (!$this->isCalendarExists()) {
            throw new GoogleSyncException('Unable to set Google Calendar', GoogleSyncException::GCALENDAR_FAILURE);
        }
        return $this->calendarId;
    }

/**
     * find the id of the 'SuiteCRM' calendar ... in the future, this will return the calendar of the users choosing.
     *
     * @param \Google\Service\Calendar\CalendarList $calendarList
     *
     * @return string|null Matching Google Calendar ID or null.
     */
    protected function getSuiteCRMCalendar(Google\Service\Calendar\CalendarList $calendarList)
    {
        foreach ($calendarList->getItems() as $calendarListEntry) {
            if ($calendarListEntry->getSummary() == $this->suiteCalendarName) {
                return $calendarListEntry->getId();
                break;
            }
        }
        return null;
    }

/**
     * Get events in users google calendar
     *
     *
     * @return bool|array Array of Google\Service\Calendar\Event Objects
     */
    protected function getUserGoogleEvents()
    {

// Make sure we have a Google Calendar Service instance and
        // Make sure we have a calendar id
        if (!$this->isServiceExists() || !$this->isCalendarExists()) {
            return false;
        }

// Set Options for what events we get from Google
        $optParams = array(
            'maxResults' => 500,
            'showDeleted' => true,
            'singleEvents' => true,
            'timeMin' => date('c', strtotime('-1 month')),
            'timeMax' => date('c', strtotime('+3 month')),
        );

$results_g = $this->gService->events->listEvents($this->calendarId, $optParams);

// We only want the events, not the leading cruft
        $results = $results_g->getItems();

if (empty($results)) {
            $this->logger->info(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'No events found.');
        } else {
            $this->logger->info(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Found ' . count($results) . ' Google Events');
        }

return $results;
    }

/**
     * Make sure we have a Google Calendar Service instance
     *
     * @return boolean
     */
    protected function isServiceExists()
    {
        // Make sure we have a Google Calendar Service instance
        if (!isset($this->gService)) {
            return false;
        }
        return true;
    }

/**
     * Make sure we have a calendar id
     *
     * @return boolean
     */
    protected function isCalendarExists()
    {
        // Make sure we have a calendar id
        if (empty($this->calendarId)) {
            return false;
        }
        return true;
    }

/**
     * Get a google event by the event id
     *
     * @param string $event_id Google Event ID
     *
     * @return \Google\Service\Calendar\Event|null Google\Service\Calendar\Event if found, null if not found
     * @throws GoogleSyncException if $event_id is empty
     * @throws GoogleSyncException if Google Service not set up
     */
    protected function getGoogleEventById($event_id)
    {
        if (empty($event_id)) {
            // If we didn't get passed an event id, throw an exception
            throw new GoogleSyncException('event ID is empty', GoogleSyncException::EVENT_ID_IS_EMPTY);
        }

// Make sure the calendar service is set up
        if (!$this->isServiceExists()) {
            throw new GoogleSyncException('Cannot Continue Without Google Service', GoogleSyncException::GCALENDAR_FAILURE);
        }

$gEvent = $this->gService->events->get($this->calendarId, $event_id);

if (!empty($gEvent->getId())) {
            return $gEvent;
        }
        return null;
    }

/**
     * Get a SuiteCRM meeting by Google Event ID
     *
     * @param string $event_id The Google Event ID
     *
     * @return \Meeting|null SuiteCRM Meeting Bean if found, null if not found
     * @throws GoogleSyncException if more than one meeting matches $event_id
     * @throws GoogleSyncException If unable to retrieve meeting bean
     */
    protected function getMeetingByEventId($event_id)
    {

// We do it this way so we also get deleted meetings
        $eventIdQuoted = $this->db->quoted($event_id);
        $query = "SELECT id FROM meetings WHERE gsync_id = {$eventIdQuoted}";
        $result = $this->db->query($query);

if (!$result) {
            throw new GoogleSyncException('Meeting not found with specified gsync_id: ' . $eventIdQuoted, GoogleSyncException::MEETING_NOT_FOUND);
        }

// This checks to make sure we only get one result. If we get more than one, something is inconsistant in the DB
        if ($result->num_rows > 1) {
            throw new GoogleSyncException('More than one meeting matches Google Id!', GoogleSyncException::AMBIGUOUS_MEETING_ID);
        } elseif ($result->num_rows == 0) {
            return null; // No matches Found
        }

$row = $this->db->fetchByAssoc($result);
        $meeting = BeanFactory::getBean('Meetings', $row['id']);
        if (!$meeting) {
            throw new GoogleSyncException('Unable to get Meetings bean.', GoogleSyncException::UNABLE_TO_RETRIEVE_MEETING);
        }
        return $meeting;
    }

/**
     * Creates and Sets $this->gService to a valid Google Calendar Service
     *
     * @return bool true on Success
     * @throws GoogleSyncException If gClient not set
     * @throws GoogleSyncException If gService Setup Fails
     */
    protected function setGService()
    {
        // make sure we have a client set
        if (!isset($this->gClient)) {
            throw new GoogleSyncException('The Google Client is not set up. See setClient Method', GoogleSyncException::NO_GCLIENT_SET);
        }

// create new calendar service
        $this->gService = new \Google\Service\Calendar($this->gClient);
        if ($this->isServiceExists()) {
            return true;
        }
        throw new GoogleSyncException('Setting $this->gService Failed', GoogleSyncException::NO_GSERVICE_SET);
    }

/**
     * Push event from SuiteCRM to Google Calendar
     *
     * If the google event is not provided, a new one will be created
     * and inserted. If one is provided, the existing Google Event will
     * be updated.
     *
     * @param Meeting $event_local : SuiteCRM Meeting Bean
     * @param \Google\Service\Calendar\Event $event_remote (optional) \Google\Service\Calendar\Event Object
     *
     * @return string|bool Meeting Id on success, false on failure
     */
    protected function pushEvent(Meeting $event_local = null, Google\Service\Calendar\Event $event_remote = null)
    {
        if (!$event_local instanceof Meeting) {
            throw new InvalidArgumentException('Argument 1 passed to GoogleSyncBase::pushEvent() must be an instance of Meeting, ' . getType($event_local) . ' given.');
        }
        if (!$this->gService instanceof Google\Service\Calendar) {
            throw new GoogleSyncException('GooleSyncBase is trying to push event but Google\Service\Calendar\Resource\Events is not set.', GoogleSyncException::NO_GSERVICE_SET);
        }
        if (!$this->gService->events instanceof Google\Service\Calendar\Resource\Events) {
            throw new GoogleSyncException('GooleSyncBase is trying to push event but Google\Service\Calendar\Resource\Events is not set.', GoogleSyncException::NO_GRESOURCE_SET);
        }

if (!isset($event_remote) || empty($event_remote)) {
            $event = $this->createGoogleCalendarEvent($event_local);
            $return = $this->gService->events->insert($this->calendarId, $event);
        } elseif (isset($event_remote)) {
            $event = $this->updateGoogleCalendarEvent($event_local, $event_remote);
            $return = $this->gService->events->update($this->calendarId, $event->getId(), $event);
        }

/* We don't get a status code back showing success. Instead, the return of the
         * create or update is the Google\Service\Calendar\Event object after saving.
         * So we check to make sure it has an ID to determine Success/Failure.
         */
        if (!isset($return->id)) {
            throw new GoogleSyncException('GCalendar insert/update failed.', GoogleSyncException::GEVENT_INSERT_OR_UPDATE_FAILURE);
        }

// Set the SuiteCRM Meeting's last sync timestamp, and google id. Return the saved meeting id from called method.
        return $this->setLastSync($event_local, $return->getId());
    }

/**
     * Helper method to get a Google\Service\Calendar\EventExtendedProperties object for the Google event
     *
     * Takes the local and remote events, and returns a Google\Service\Calendar\EventExtendedProperties
     *
     * @param \Google\Service\Calendar\Event $event_remote \Google\Service\Calendar\Event Object
     * @param Meeting $event_local Meeting (optional) \Meeting Bean
     *
     * @return Google\Service\Calendar\EventExtendedProperties object
     */
    protected function returnExtendedProperties(Google\Service\Calendar\Event $event_remote, Meeting $event_local)
    {
        // We pull the existing extendedProperties, and change our values
        // That way we don't mess with anything else that's using other values.
        $extendedProperties = $event_remote->getExtendedProperties();

if (!empty($extendedProperties)) {
            $private = $extendedProperties->getPrivate();
        } elseif (empty($extendedProperties)) {
            $extendedProperties = new Google\Service\Calendar\EventExtendedProperties;
            $private = array();
        }

$private['suitecrm_id'] = $event_local->id;
        $private['suitecrm_type'] = $event_local->module_name;

$extendedProperties->setPrivate($private);

return $extendedProperties;
    }

/**
     * Pull event from Google Calendar to SuiteCRM
     *
     * If the SuiteCRM Meeting is not provided, a new one will be created
     * and inserted. If one is provided, the existing meeting will be updated.
     *
     * @param \Google\Service\Calendar\Event $event_remote \Google\Service\Calendar\Event Object
     * @param Meeting $event_local Meeting (optional) \Meeting Bean
     *
     * @return bool Success/Failure of setLastSync, since that's what saves the record
     * @throws GoogleSyncException if returned event invalid
     */
    protected function pullEvent(Google\Service\Calendar\Event $event_remote = null, Meeting $event_local = null)
    {
        if (!$event_remote instanceof Google\Service\Calendar\Event) {
            throw new InvalidArgumentException('Argument 1 passed to GoogleSyncBase::pullEvent() must be an instance of Google\Service\Calendar\Event, ' . getType($event_local) . ' given.');
        }

if (!isset($event_local) || empty($event_local)) {
            $event = $this->createSuitecrmMeetingEvent($event_remote);
        } elseif (isset($event_local)) {
            $event = $this->updateSuitecrmMeetingEvent($event_local, $event_remote);
        }

if (empty($event)) {
            throw new GoogleSyncException('Something Horrible Happened in [create|update]SuitecrmMeetingEvent!', GoogleSyncException::MEETING_CREATE_OR_UPDATE_FAILURE);
        }

// We need to set the suitecrm_ private properties in the Google event here,
        // Otherwise it's seen as a new event next time we sync
        $extendedProperties = $this->returnExtendedProperties($event_remote, $event);
        $event_remote->setExtendedProperties($extendedProperties);

$greturn = $this->gService->events->update($this->calendarId, $event_remote->getId(), $event_remote);

/* We don't get a status code back showing success. Instead, the return of the
         * create or update is the Google\Service\Calendar\Event object after saving.
         * So we check to make sure it has an ID to determine Success/Failure.
         */
        if (isset($greturn->id)) {
            return $this->setLastSync($event, $event_remote->getId());
        }
        return false;
    }

/**
     * Delete SuiteCRM Meeting
     *
     * @param Meeting $meeting SuiteCRM Meeting Bean
     *
     * @return string|bool Meeting Id on success, false on failure (from setLastSync, since that's what saves the record)
     */
    protected function delMeeting(Meeting $meeting = null)
    {
        if (!$meeting instanceof Meeting) {
            throw new InvalidArgumentException('Argument 1 passed to GoogleSyncBase::delMeeting() must be an instance of Meeting, ' . getType($meeting) . ' given.');
        }

$meeting->deleted = '1';
        $meeting->gsync_id = '';
        return $this->setLastSync($meeting);
    }

/**
     * Delete Google Event
     *
     * @param \Google\Service\Calendar\Event $event \Google\Service\Calendar\Event Object
     * @param String $meeting_id SuiteCRM Meeting Id
     *
     * @return string Meeting Id on success
     * @throws GoogleSyncException If Google Service Unset
     * @throws GoogleSyncException If Meeting ID missing
     * @throws GoogleSyncException If Meeting ID fails validation
     * @throws GoogleSyncException If delete fails
     */
    protected function delEvent(Google\Service\Calendar\Event $event = null, $meeting_id = null)
    {
        if (!$event instanceof Google\Service\Calendar\Event) {
            throw new InvalidArgumentException('Argument 1 passed to GoogleSyncBase::delEvent() must be an instance of Google\Service\Calendar\Event, ' . gettype($event) . ' given');
        }

// Make sure the calendar service is set up
        if (!$this->isServiceExists()) {
            throw new GoogleSyncException('The Google Service is not set up. See setGService Method.', GoogleSyncException::NO_GSERVICE_SET);
        }

// Make sure we got a meeting_id
        if (!$meeting_id) {
            throw new GoogleSyncException('This method requires a meeting id as the 2nd parameter', GoogleSyncException::MEETING_ID_IS_EMPTY);
        }

// Validate and quote the meetingID
        $isValidator = new SuiteValidator();
        if (!$isValidator->isValidId($this->db->quote($meeting_id))) {
            throw new GoogleSyncException('Meeting ID could not be validated', GoogleSyncException::RECORD_VALIDATION_FAILURE);
        }

$return = $this->gService->events->delete($this->calendarId, $event->getId());

// Pull the status code returned to determine Success/Failure
        $statusCode = $return->getStatusCode();

if ($statusCode >= 200 && $statusCode <= 299) {
            // 2xx statusCode = success
            $this->logger->debug(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Received Success Status Code: ' . $statusCode . ' on delete.');

// This removes the gsync_id reference from the table.
            $sql = "UPDATE meetings SET gsync_id = '' WHERE id = {$this->db->quoted($meeting_id)}";
            $res = $this->db->query($sql);
            if (!$res) {
                $this->logger->fatal(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Failed to remove gsync_id from record ' . $meeting_id);
            }
            return $meeting_id;
        }
        throw new GoogleSyncException('Received Failure Status Code: ' . $statusCode . ' on delete!', GoogleSyncException::GEVENT_INSERT_OR_UPDATE_FAILURE);
    }

/**
     * Helper method. Clear all popup reminders from crm meeting
     *
     * @param string $event_id The ID of the event in the DB
     *
     * @return bool Success/Failure
     */
    protected function clearPopups($event_id)
    {
        if (!isset($event_id) || empty($event_id)) {
            throw new InvalidArgumentException('Argument 1 not passed to GoogleSyncBase::clearPopups()');
        }

// Disable all popup reminders for the SuiteCRM meeting, and mark reminders where email is disabled as deleted.
        $eventIdQuoted = $this->db->quoted($event_id);
        $sql = sprintf("UPDATE reminders SET popup = '0', deleted = CASE WHEN email = '0' THEN '1' ELSE deleted	END WHERE related_event_module_id = %s AND deleted = '0'", $eventIdQuoted);
        $res = $this->db->query($sql);
        if (!$res) {
            throw new GoogleSyncException('SQL Failure', GoogleSyncException::SQL_FAILURE);
        }
        return true;
    }

/**
     * Update SuiteCRM Meeting from Google Calendar Event
     *
     * @param Meeting $event_local SuiteCRM Meeting Bean
     * @param \Google\Service\Calendar\Event $event_remote Google\Service\Calendar\Event Object
     *
     * @return Meeting|bool SuiteCRM Meeting Bean or false on failure
     * @throws GoogleSyncException if the Google Event is missing required data
     */
    protected function updateSuitecrmMeetingEvent(Meeting $event_local, Google\Service\Calendar\Event $event_remote)
    {
        $event_local->name = (string) $event_remote->getSummary();

if (empty($event_local->name)) { // Google doesn't require titles on events.
            $event_local->name = '(No title)'; // This is what they look like in google, so it should be seamless.
        }

$event_local->description = (string) $event_remote->getDescription();
        $event_local->location = (string) $event_remote->getLocation();

// Get Start/End/Duration from Google Event
        // FUTURE: This is where all day event conversion will need to happen.
        $start = $event_remote->getStart();
        if (!$start) {
            throw new GoogleSyncException(
                'GoogleSyncBase is trying to get "start" as Google\Service\Calendar\EventDateTime but it is not set',
                GoogleSyncException::NO_REMOVE_EVENT_START_IS_NOT_SET
            );
        }
        if (!$start instanceof Google\Service\Calendar\EventDateTime) {
            throw new GoogleSyncException(
                'GoogleSyncBase is trying to get "start" as Google\Service\Calendar\EventDateTime but it is incorrect, ' .
                gettype($start) . ' given.',
                GoogleSyncException::NO_REMOVE_EVENT_START_IS_INCORRECT
            );
        }
        $starttime = strtotime($start->getDateTime());
        $endtime = strtotime($event_remote->getEnd()->getDateTime());
        if (!$starttime || !$endtime) { // Verify we have valid time objects (All day events will fail here.)
            throw new GoogleSyncException(
                'Unable to retrieve times from Google Event',
               GoogleSyncException::GOOGLE_RECORD_PARSE_FAILURE
            );
        }
        $diff = abs($starttime - $endtime);
        $tmins = $diff / 60;
        $hours = floor($tmins / 60);
        $mins = $tmins % 60;

// Set Start/End/Duration in SuiteCRM Meeting and Assigned User
        $event_local->date_start = gmdate("Y-m-d H:i:s", $starttime);
        $event_local->date_end = gmdate("Y-m-d H:i:s", $endtime);
        $event_local->duration_hours = $hours;
        $event_local->duration_minutes = $mins;
        $event_local->assigned_user_id = $this->workingUser->id;

// Disable all popup reminders for the SuiteCRM meeting. We add them back from Google event below.
        $event_id = $event_local->id;
        $this->clearPopups($event_id);

// Get Google Event Popup Reminders
        $gReminders = $event_remote->getReminders();
        $overrides = $gReminders->getOverrides();

// Create a new popup reminder for each google reminder
        $helper = new GoogleSyncHelper;
        $nestedArray = $helper->createSuitecrmReminders($overrides, $event_local);
        $reminders = $nestedArray[0];
        $invitees = $nestedArray[1];

foreach ($reminders as $reminder) {
            $reminder->save(false);
        }

foreach ($invitees as $invitee) {
            $invitee->save(false);
        }

return $event_local;
    }

/**
     * Create SuiteCRM Meeting event
     *
     * @param \Google\Service\Calendar\Event $event_remote The Google\Service\Calendar\Event we're creating a SuiteCRM Meeting for
     *
     * @return Meeting|bool SuiteCRM Meeting Bean or false on failure
     * @throws GoogleSyncException if fails to retrive meeting
     */
    protected function createSuitecrmMeetingEvent(Google\Service\Calendar\Event $event_remote)
    {
        $this->logger->debug(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Creating New SuiteCRM Meeting');
        $meeting = BeanFactory::getBean('Meetings');
        if (!$meeting) {
            throw new GoogleSyncException('Unable to get Meeting bean.', GoogleSyncException::UNABLE_TO_RETRIEVE_MEETING);
        }
        $meeting->id = create_guid();
        $meeting->new_with_id = true;
        $event_local = $this->updateSuitecrmMeetingEvent($meeting, $event_remote);
        return $event_local;
    }

/**
     * Update Google Calendar Event from SuiteCRM Meeting
     *
     * @param Meeting $event_local SuiteCRM Meeting Bean
     * @param \Google\Service\Calendar\Event $event_remote Google Event Object
     *
     * @return \Google\Service\Calendar\Event
     */
    protected function updateGoogleCalendarEvent(Meeting $event_local, Google\Service\Calendar\Event $event_remote)
    {
        $event_remote->setSummary($event_local->name);
        $event_remote->setDescription($event_local->description);
        $event_remote->setLocation($event_local->location);

$timedate = new TimeDate;
        $localStart = $timedate->to_db($event_local->date_start, false);
        $localEnd = $timedate->to_db($event_local->date_end, false);

$startDateTime = new \Google\Service\Calendar\EventDateTime;
        $startDateTime->setDateTime(date(DATE_ATOM, strtotime($localStart . ' UTC')));
        $startDateTime->setTimeZone($this->timezone);
        $event_remote->setStart($startDateTime);

$endDateTime = new \Google\Service\Calendar\EventDateTime;
        $endDateTime->setDateTime(date(DATE_ATOM, strtotime($localEnd . ' UTC')));
        $endDateTime->setTimeZone($this->timezone);
        $event_remote->setEnd($endDateTime);

$extendedProperties = $this->returnExtendedProperties($event_remote, $event_local);
        $event_remote->setExtendedProperties($extendedProperties);

// Copy over popup reminders
        $event_local_id = $this->db->quoted($event_local->id);
        $reminders_local = BeanFactory::getBean('Reminders')->get_full_list(
                "",
            "reminders.related_event_module = 'Meetings'" .
                " AND reminders.related_event_module_id = $event_local_id" .
                " AND popup = '1'"
        );

if ($reminders_local) {
            $reminders_remote = new Google\Service\Calendar\EventReminders;
            $reminders_remote->setUseDefault(false);
            $reminders_array = array();
            foreach ($reminders_local as $reminder_local) {
                $reminder_remote = new Google\Service\Calendar\EventReminder;
                $reminder_remote->setMethod('popup');
                $reminder_remote->setMinutes($reminder_local->timer_popup / 60);
                $reminders_array[] = $reminder_remote;
            }
            $reminders_remote->setOverrides($reminders_array);
            $event_remote->setReminders($reminders_remote);
        }
        return $event_remote;
    }

/**
     * Create New Google Event object for SuiteCRM Meeting
     *
     * @param Meeting $event_local SuiteCRM Meeting Bean
     *
     * @return \Google\Service\Calendar\Event Google\Service\Calendar\Event Object
     */
    protected function createGoogleCalendarEvent(Meeting $event_local)
    {

//We're creating a new event
        $event_remote_empty = new Google\Service\Calendar\Event;

$extendedProperties = new Google\Service\Calendar\EventExtendedProperties;
        $extendedProperties->setPrivate(array());

$event_remote_empty->setExtendedProperties($extendedProperties);

//Set the Google Event up to match the SuiteCRM one
        $event_remote = $this->updateGoogleCalendarEvent($event_local, $event_remote_empty);

return $event_remote;
    }

/**
     * Set the timezone
     *
     * @param string $timezone : timezone_identifier (ie. America/New_York)
     *
     * @return bool true on Success
     * @throws GoogleSyncException on failure
     */
    protected function setTimezone($timezone)
    {
        if (date_default_timezone_set($timezone)) {
            $this->timezone = date_default_timezone_get();
            $this->logger->info(__FILE__ . ':' . __LINE__ . ' ' . __METHOD__ . ' - ' . 'Timezone set to \'' . $this->timezone . '\'');
            return true;
        }
        throw new GoogleSyncException('Failed to set timezone to ' . $timezone, GoogleSyncException::TIMEZONE_SET_FAILURE);
    }

/**
     * Set the last sync time for the record
     *
     * This *must* be called *after* the sync is done
     * This also saves the event, so you don't need to do it twice. Just call this.
     *
     * @param Meeting $event_local SuiteCRM Meeting bean
     * @param string $gEventId (optional) The ID that Google has for the event.
     *
     * @return string Meeting Id on success
     * @throws GoogleSyncException If working user invalid
     * @throws GoogleSyncException if meeting save fails
     */
    protected function setLastSync(Meeting $event_local, $gEventId = null)
    {
        if (isset($gEventId)) {
            $event_local->gsync_id = $gEventId;
        }

$event_local->gsync_lastsync = time() + 3; // we add three seconds to this, so that the modified time is always older than the gsync_lastsync time
        $return = $event_local->save(false);

$isValidator = new SuiteValidator();
        if ($isValidator->isValidId($return)) {
            if (!$this->workingUser instanceof User) {
                throw new GoogleSyncException('GoogleSyncBase is trying to setLastSync but workingUser type is incorrect, ' . gettype($this->workingUser) . ' given.', GoogleSyncException::INCORRECT_WORKING_USER_TYPE);
            }
            $event_local->set_accept_status($this->workingUser, 'accept');  // Set the meeting as accepted by the user, otherwise it doesn't show up on the calendar. We do it here because it must be saved first.
            //$this->syncedList[] = $event_local->id;
            return $event_local->id;
        }
        throw new GoogleSyncException('Something went wrong saving the local record.', GoogleSyncException::MEETING_SAVE_FAILURE);
    }
}

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