<?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);

namespace Chill\CalendarBundle\RemoteCalendar\Connector;

use Chill\CalendarBundle\Entity\CalendarRange;
use Chill\CalendarBundle\RemoteCalendar\Connector\MSGraph\MachineHttpClient;
use Chill\CalendarBundle\RemoteCalendar\Connector\MSGraph\MapCalendarToUser;
use Chill\CalendarBundle\RemoteCalendar\Connector\MSGraph\OnBehalfOfUserHttpClient;
use Chill\CalendarBundle\RemoteCalendar\Connector\MSGraph\OnBehalfOfUserTokenStorage;
use Chill\CalendarBundle\RemoteCalendar\Connector\MSGraph\RemoteEventConverter;
use Chill\MainBundle\Entity\User;
use DateTimeImmutable;
use Psr\Log\LoggerInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;

class MSGraphRemoteCalendarConnector implements RemoteCalendarConnectorInterface
{
    private LoggerInterface $logger;

    private MachineHttpClient $machineHttpClient;

    private MapCalendarToUser $mapCalendarToUser;

    private RemoteEventConverter $remoteEventConverter;

    private OnBehalfOfUserTokenStorage $tokenStorage;

    private UrlGeneratorInterface $urlGenerator;

    private OnBehalfOfUserHttpClient $userHttpClient;

    public function __construct(
        MachineHttpClient $machineHttpClient,
        MapCalendarToUser $mapCalendarToUser,
        LoggerInterface $logger,
        OnBehalfOfUserTokenStorage $tokenStorage,
        OnBehalfOfUserHttpClient $userHttpClient,
        RemoteEventConverter $remoteEventConverter,
        UrlGeneratorInterface $urlGenerator
    ) {
        $this->machineHttpClient = $machineHttpClient;
        $this->mapCalendarToUser = $mapCalendarToUser;
        $this->logger = $logger;
        $this->remoteEventConverter = $remoteEventConverter;
        $this->tokenStorage = $tokenStorage;
        $this->urlGenerator = $urlGenerator;
        $this->userHttpClient = $userHttpClient;
    }

    public function getMakeReadyResponse(string $returnPath): Response
    {
        return new RedirectResponse($this->urlGenerator
            ->generate('chill_calendar_remote_connect_azure', ['returnPath' => $returnPath]));
    }

    public function isReady(): bool
    {
        return $this->tokenStorage->hasToken();
    }

    public function listEventsForUser(User $user, DateTimeImmutable $startDate, DateTimeImmutable $endDate): array
    {
        $userId = $this->mapCalendarToUser->getUserId($user);

        if (null === $userId) {
            return [];
        }

        try {
            $bareEvents = $this->userHttpClient->request(
                'GET',
                'users/' . $userId . '/calendarView',
                [
                    'query' => [
                        'startDateTime' => $startDate->format(DateTimeImmutable::ATOM),
                        'endDateTime' => $endDate->format(DateTimeImmutable::ATOM),
                        '$select' => 'id,subject,start,end',
                    ],
                ]
            )->toArray();

            return array_map(function ($item) { return $this->remoteEventConverter->convertToRemote($item); }, $bareEvents['value']);
        } catch (ClientExceptionInterface $e) {
            if (403 === $e->getResponse()->getStatusCode()) {
                return $this->getScheduleTimesForUser($user, $startDate, $endDate);
            }

            $this->logger->debug('Could not get list of event on MSGraph', [
                'error_code' => $e->getResponse()->getStatusCode(),
                'error' => $e->getResponse()->getInfo(),
            ]);

            return [];
        }
    }

    public function removeCalendarRange(string $remoteId, array $remoteAttributes, User $user): void
    {
        if ('' === $remoteId) {
            return;
        }

        $this->removeEvent($remoteId, $user);
    }

    public function syncCalendarRange(CalendarRange $calendarRange): void
    {
        if ($calendarRange->hasRemoteId()) {
            $this->updateRemoteCalendarRange($calendarRange);
        } else {
            $this->createRemoteCalendarRange($calendarRange);
        }
    }

    private function createRemoteCalendarRange(CalendarRange $calendarRange): void
    {
        $userId = $this->mapCalendarToUser->getUserId($calendarRange->getUser());
        $calendarId = $this->mapCalendarToUser->getCalendarId($calendarRange->getUser());

        if (null === $userId || null === $calendarId) {
            $this->logger->warning('user does not have userId nor calendarId', [
                'user_id' => $calendarRange->getUser()->getId(),
                'calendar_range_id' => $calendarRange->getId(),
            ]);

            return;
        }

        $eventData = $this->remoteEventConverter->calendarRangeToEvent($calendarRange);

        try {
            $event = $this->machineHttpClient->request(
                'POST',
                'users/' . $userId . '/calendar/events',
                [
                    'json' => $eventData,
                ]
            )->toArray();
        } catch (ClientExceptionInterface $e) {
            $this->logger->warning('could not save calendar range to remote', [
                'exception' => $e->getTraceAsString(),
                'calendarRangeId' => $calendarRange->getId(),
            ]);

            throw $e;
        }

        $calendarRange->setRemoteId($event['id'])
            ->addRemoteAttributes([
                'lastModifiedDateTime' => $this->remoteEventConverter->getLastModifiedDate($event)->getTimestamp(),
                'changeKey' => $event['changeKey'],
            ]);
    }

    private function getScheduleTimesForUser(User $user, DateTimeImmutable $startDate, DateTimeImmutable $endDate): array
    {
        $userId = $this->mapCalendarToUser->getUserId($user);

        if (null === $userId) {
            return [];
        }

        if (null === $user->getEmailCanonical() || '' === $user->getEmailCanonical()) {
            return [];
        }

        $body = [
            'schedules' => [$user->getEmailCanonical()],
            'startTime' => [
                'dateTime' => ($startDate->setTimezone(RemoteEventConverter::getRemoteTimeZone())->format(RemoteEventConverter::getRemoteDateTimeSimpleFormat())),
                'timeZone' => 'UTC',
            ],
            'endTime' => [
                'dateTime' => ($endDate->setTimezone(RemoteEventConverter::getRemoteTimeZone())->format(RemoteEventConverter::getRemoteDateTimeSimpleFormat())),
                'timeZone' => 'UTC',
            ],
        ];

        try {
            $response = $this->userHttpClient->request('POST', 'users/' . $userId . '/calendar/getSchedule', [
                'json' => $body,
            ])->toArray();
        } catch (ClientExceptionInterface $e) {
            $this->logger->debug('Could not get schedule on MSGraph', [
                'error_code' => $e->getResponse()->getStatusCode(),
                'error' => $e->getResponse()->getInfo(),
            ]);

            return [];
        }

        return array_map(
            function ($item) {
                return $this->remoteEventConverter->convertAvailabilityToRemoteEvent($item);
            },
            $response['value'][0]['scheduleItems']
        );
    }

    private function removeEvent($remoteId, User $user): void
    {
        $userId = $this->mapCalendarToUser->getUserId($user);

        try {
            $this->machineHttpClient->request(
                'DELETE',
                'users/' . $userId . '/calendar/events/' . $remoteId
            );
        } catch (ClientExceptionInterface $e) {
            $this->logger->warning('could not remove event from calendar', [
                'event_remote_id' => $remoteId,
                'user_id' => $user->getId(),
            ]);
        }
    }

    private function updateRemoteCalendarRange(CalendarRange $calendarRange): void
    {
        $userId = $this->mapCalendarToUser->getUserId($calendarRange->getUser());
        $calendarId = $this->mapCalendarToUser->getCalendarId($calendarRange->getUser());

        if (null === $userId || null === $calendarId) {
            $this->logger->warning('user does not have userId nor calendarId', [
                'user_id' => $calendarRange->getUser()->getId(),
                'calendar_range_id' => $calendarRange->getId(),
            ]);

            return;
        }

        try {
            $event = $this->machineHttpClient->request(
                'GET',
                'users/' . $userId . '/calendar/events/' . $calendarRange->getRemoteId()
            )->toArray();
        } catch (ClientExceptionInterface $e) {
            $this->logger->warning('Could not get event from calendar', [
                'calendar_range_id' => $calendarRange->getId(),
                'calendar_range_remote_id' => $calendarRange->getRemoteId(),
            ]);

            throw $e;
        }

        if ($this->remoteEventConverter->getLastModifiedDate($event)->getTimestamp() > $calendarRange->getUpdatedAt()->getTimestamp()) {
            $this->logger->info('Skip updating as the lastModified date seems more fresh than the database one', [
                'calendar_range_id' => $calendarRange->getId(),
                'calendar_range_remote_id' => $calendarRange->getRemoteId(),
                'db_last_updated' => $calendarRange->getUpdatedAt()->getTimestamp(),
                'remote_last_updated' => $this->remoteEventConverter->getLastModifiedDate($event)->getTimestamp(),
            ]);

            return;
        }

        $eventData = $this->remoteEventConverter->calendarRangeToEvent($calendarRange);

        try {
            $event = $this->machineHttpClient->request(
                'PATCH',
                'users/' . $userId . '/calendar/events/' . $calendarRange->getRemoteId(),
                [
                    'json' => $eventData,
                ]
            )->toArray();
        } catch (ClientExceptionInterface $e) {
            $this->logger->warning('could not update calendar range to remote', [
                'exception' => $e->getTraceAsString(),
                'calendarRangeId' => $calendarRange->getId(),
            ]);

            throw $e;
        }

        $calendarRange
            ->addRemoteAttributes([
                'lastModifiedDateTime' => $this->remoteEventConverter->getLastModifiedDate($event)->getTimestamp(),
                'changeKey' => $event['changeKey'],
            ]);
    }
}