<?php declare(strict_types=1);
/**
 * This file is part of the SplendidBear Websites' projects.
 *
 * Copyright (c) 2019 @ www.splendidbear.org
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace App\Util;

use App\Entity\Gamer;
use App\Entity\PlayedGame;
use App\Entity\Step;
use App\Entity\User;
use App\Interfaces\TopicManagerInterface;
use DateTime;
use Doctrine\ORM\EntityManagerInterface;
use Exception;
use RuntimeException;
use JsonException;
use Psr\Log\LoggerInterface;
use Symfony\Component\Mercure\HubInterface;
use Symfony\Component\Mercure\Update;
use Symfony\Component\Security\Core\User\UserInterface;

/**
 * Class TopicManager
 *
 * @package  App\Util
 * @author   Lang <https://www.splendidbear.org>
 * @category Class
 * @license  https://www.gnu.org/licenses/lgpl-3.0.en.html GNU Lesser General Public License
 * @link     www.splendidbear.org
 * @since    2026. 04. 09.
 */
class TopicManager implements TopicManagerInterface
{
    public function __construct(
        private readonly HubInterface           $hub,
        private readonly EntityManagerInterface $entityManager,
        private readonly LoggerInterface        $logger
    ) {
    }

    public function subscribe(string $gameAssoc, string $userName, ?UserInterface $user): void
    {
        $playedGame = $this->getPlayedGame($gameAssoc);
        if (null === $playedGame) {
            return;
        }

        $users = $this->getUserCollection($playedGame);
        $count = $this->getPlayerCount($users);
        $isKnown = in_array($userName, array_filter(array_values($users)), true);

        /** Reject a third player who is not a reconnecting player */
        if ($count >= 2 && !$isKnown) {
            return;
        }

        /** Save the player to the database on a fresh join */
        if (!$isKnown && $count < 2) {
            $users = $this->saveUserToDb($gameAssoc, $userName, $user, $count + 1);
            $count = $this->getPlayerCount($users);
        }

        $topic = 'mineseeker/channel/' . $gameAssoc;

        try {
            $this->hub->publish(new Update(
                $topic,
                json_encode([
                    'userTopicId' => $userName,
                    'channel'     => $topic,
                    'user'        => $userName,
                    'userCnt'     => $count,
                    'users'       => $users,
                ], JSON_THROW_ON_ERROR)
            ));
        } catch (JsonException $e) {
            throw new RuntimeException($e->getMessage());
        }
    }

    public function unSubscribe(string $gameAssoc, string $userName): void
    {
        $topic = 'mineseeker/channel/' . $gameAssoc;

        $this->hub->publish(new Update(
            $topic,
            json_encode(['msg' => $userName . ' has left ' . $topic])
        ));
    }

    public function publish(string $gameAssoc, string $userName, array $event): void
    {
        null === $event['resign']
            ? $this->saveStepToDb($gameAssoc, $event)
            : $this->saveResignToDb($gameAssoc, $event['resign']);

        $playedGame = $this->getPlayedGame($gameAssoc);
        $users = $this->getUserCollection($playedGame);
        $count = $this->getPlayerCount($users);
        $topic = 'mineseeker/channel/' . $gameAssoc;

        try {
            $this->hub->publish(new Update(
                $topic,
                json_encode([
                    'userTopicId' => $userName,
                    'channel'     => $topic,
                    'user'        => $userName,
                    'userCnt'     => $count,
                    'data'        => $event,
                ], JSON_THROW_ON_ERROR)
            ));
        } catch (JsonException $e) {
            throw new RuntimeException($e->getMessage());
        }
    }

    private function getPlayedGame(string $gameAssoc): ?PlayedGame
    {
        return $this->entityManager
            ->getRepository(PlayedGame::class)
            ->findOneByGameAssoc($gameAssoc);
    }

    private function getPlayerCount(array $users): int
    {
        $red = '' !== $users['red'] || '' !== $users['redAnon'] ? 1 : 0;
        $blue = '' !== $users['blue'] || '' !== $users['blueAnon'] ? 1 : 0;

        return $red + $blue;
    }

    private function saveResignToDb(string $gameAssoc, string $color): void
    {
        $playedGame = $this->getPlayedGame($gameAssoc);

        $playedGame->setResign($color);

        $this->entityManager->persist($playedGame);
        $this->entityManager->flush();
    }

    private function saveStepToDb(string $gameAssoc, array $event): void
    {
        try {
            $playedGame = $this->getPlayedGame($gameAssoc);

            $step = new Step();
            $step->setRow($event['coords'][0]);
            $step->setCol($event['coords'][1]);
            $step->setWBomb($event['bomb']);
            $step->setPlayedGame($playedGame);
            $step->setCreated(new DateTime());
            $this->entityManager->persist($step);

            $playedGame->setBluePoints($event['bluePoints']);
            $playedGame->setRedPoints($event['redPoints']);
            $playedGame->setBlueExplodedBomb($event['blueExplodedBomb'] ? true : null);
            $playedGame->setRedExplodedBomb($event['redExplodedBomb'] ? true : null);
            $playedGame->setUpdated(new DateTime());
            $this->entityManager->persist($playedGame);

            $this->entityManager->flush();
        } catch (Exception $e) {
            $this->logger->error($e->getMessage());
        }
    }

    private function saveUserToDb(string $gameAssoc, string $userName, ?UserInterface $user, int $count): array
    {
        $playedGame = $this->getPlayedGame($gameAssoc);

        null !== $user
            ? $this->saveRegisteredUser($userName, $count, $playedGame)
            : $this->saveAnonUser($userName, $count, $playedGame);

        $this->entityManager->persist($playedGame);
        $this->entityManager->flush();

        return $this->getUserCollection($playedGame);
    }

    private function saveRegisteredUser(string $userName, int $count, PlayedGame $playedGame): void
    {
        /** @var User $user */
        $user = $this->entityManager
            ->getRepository(User::class)
            ->findOneByUsername($userName);

        try {
            if ($count === 1) {
                $random = random_int(0, 1);
                !$random ? $playedGame->setRed($user) : $playedGame->setBlue($user);
            } else {
                null === $playedGame->getRed() && null === $playedGame->getRedAnon()
                    ? $playedGame->setRed($user)
                    : $playedGame->setBlue($user);
            }
        } catch (Exception $e) {
            $this->logger->error($e->getMessage());
        }
    }

    private function saveAnonUser(string $userName, int $count, PlayedGame $playedGame): void
    {
        try {
            $anon = new Gamer();
            $anon->setUsername($userName);
            $anon->setConnTimestamp(new DateTime());
            $this->entityManager->persist($anon);

            if ($count === 1) {
                $random = random_int(0, 1);
                !$random ? $playedGame->setRedAnon($anon) : $playedGame->setBlueAnon($anon);
            } else {
                null === $playedGame->getRed() && null === $playedGame->getRedAnon()
                    ? $playedGame->setRedAnon($anon)
                    : $playedGame->setBlueAnon($anon);
            }
        } catch (Exception $e) {
            $this->logger->error($e->getMessage());
        }
    }

    private function getUserCollection(PlayedGame $playedGame): array
    {
        return [
            'red'      => null !== $playedGame->getRed() ? $playedGame->getRed()->getUsername() : '',
            'blue'     => null !== $playedGame->getBlue() ? $playedGame->getBlue()->getUsername() : '',
            'redAnon'  => null !== $playedGame->getRedAnon() ? $playedGame->getRedAnon()->getUserName() : '',
            'blueAnon' => null !== $playedGame->getBlueAnon() ? $playedGame->getBlueAnon()->getUserName() : '',
        ];
    }
}