<?php

/**
 * Chill is a software for social workers.
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

declare(strict_types=1);

/*
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Chill\CalendarBundle\RemoteCalendar\Connector\MSGraph\RemoteToLocalSync;

use Chill\CalendarBundle\Entity\Calendar;
use Chill\CalendarBundle\Entity\Invite;
use Chill\CalendarBundle\RemoteCalendar\Connector\MSGraph\RemoteEventConverter;
use Chill\MainBundle\Entity\User;
use Chill\MainBundle\Repository\UserRepositoryInterface;
use LogicException;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
use Symfony\Contracts\HttpClient\HttpClientInterface;
use function in_array;

class CalendarSyncer
{
    private LoggerInterface $logger;

    private HttpClientInterface $machineHttpClient;

    private UserRepositoryInterface $userRepository;

    public function __construct(LoggerInterface $logger, HttpClientInterface $machineHttpClient, UserRepositoryInterface $userRepository)
    {
        $this->logger = $logger;
        $this->machineHttpClient = $machineHttpClient;
        $this->userRepository = $userRepository;
    }

    public function handleCalendarSync(Calendar $calendar, array $notification, User $user): void
    {
        switch ($notification['changeType']) {
            case 'deleted':
                $this->handleDeleteCalendar($calendar, $notification, $user);

                break;

            case 'updated':
                $this->handleUpdateCalendar($calendar, $notification, $user);

                break;

            default:
                throw new RuntimeException('this change type is not supported: ' . $notification['changeType']);
        }
    }

    private function handleDeleteCalendar(Calendar $calendar, array $notification, User $user): void
    {
        $calendar
            ->setStatus(Calendar::STATUS_CANCELED)
            ->setCalendarRange(null);
        $calendar->preventEnqueueChanges = true;
    }

    private function handleUpdateCalendar(Calendar $calendar, array $notification, User $user): void
    {
        try {
            $new = $this->machineHttpClient->request(
                'GET',
                $notification['resource']
            )->toArray();
        } catch (ClientExceptionInterface $clientException) {
            $this->logger->warning(__CLASS__ . ' could not retrieve event from ms graph. Already deleted ?', [
                'calendarId' => $calendar->getId(),
                'remoteEventId' => $notification['resource'],
            ]);

            throw $clientException;
        }

        if (false === $new['isOrganizer']) {
            return;
        }

        $lastModified = RemoteEventConverter::convertStringDateWithTimezone(
            $new['lastModifiedDateTime']
        );

        if ($calendar->getRemoteAttributes()['lastModifiedDateTime'] === $lastModified->getTimestamp()) {
            $this->logger->info(__CLASS__ . ' change key is equals. Source is probably a local update', [
                'calendarRangeId' => $calendar->getId(),
                'remoteEventId' => $notification['resource'],
            ]);

            return;
        }

        $this->syncAttendees($calendar, $new['attendees']);

        $startDate = RemoteEventConverter::convertStringDateWithoutTimezone($new['start']['dateTime']);
        $endDate = RemoteEventConverter::convertStringDateWithoutTimezone($new['end']['dateTime']);

        if ($startDate->getTimestamp() !== $calendar->getStartDate()->getTimestamp()) {
            $calendar->setStartDate($startDate);
        }

        if ($endDate->getTimestamp() !== $calendar->getEndDate()->getTimestamp()) {
            $calendar->setEndDate($endDate);
        }

        $calendar
            ->addRemoteAttributes([
                'lastModifiedDateTime' => $lastModified->getTimestamp(),
                'changeKey' => $new['changeKey'],
            ])
            ->preventEnqueueChanges = true;
    }

    private function syncAttendees(Calendar $calendar, array $attendees): void
    {
        $emails = [];

        foreach ($attendees as $attendee) {
            $status = $attendee['status']['response'];

            if ('organizer' === $status) {
                continue;
            }

            $email = $attendee['emailAddress']['address'];
            $emails[] = strtolower($email);
            $user = $this->userRepository->findOneByUsernameOrEmail($email);

            if (null === $user) {
                continue;
            }

            if (!$calendar->isInvited($user)) {
                $calendar->addUser($user);
            }

            $invite = $calendar->getInviteForUser($user);

            switch ($status) {
                // possible cases: none, organizer, tentativelyAccepted, accepted, declined, notResponded.
                case 'none':
                case 'notResponded':
                    $invite->setStatus(Invite::PENDING);

                    break;

                case 'tentativelyAccepted':
                    $invite->setStatus(Invite::TENTATIVELY_ACCEPTED);

                    break;

                case 'accepted':
                    $invite->setStatus(Invite::ACCEPTED);

                    break;

                case 'declined':
                    $invite->setStatus(Invite::DECLINED);

                    break;

                default:
                    throw new LogicException('should not happens, not implemented: ' . $status);

                    break;
            }
        }

        foreach ($calendar->getUsers() as $user) {
            if (!in_array(strtolower($user->getEmailCanonical()), $emails, true)) {
                $calendar->removeUser($user);
            }
        }
    }
}