<?php

declare(strict_types=1);

namespace App\Radio\AutoDJ;

use App\Entity;
use App\Event\Radio\AnnotateNextSong;
use App\Radio\Adapters;
use Doctrine\ORM\EntityManagerInterface;
use Psr\EventDispatcher\EventDispatcherInterface;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class Annotations implements EventSubscriberInterface
{
    public function __construct(
        protected EntityManagerInterface $em,
        protected Entity\Repository\StationQueueRepository $queueRepo,
        protected Entity\Repository\StationStreamerRepository $streamerRepo,
        protected Adapters $adapters,
        protected LoggerInterface $logger,
        protected EventDispatcherInterface $eventDispatcher,
    ) {
    }

    /**
     * @inheritDoc
     */
    public static function getSubscribedEvents(): array
    {
        return [
            AnnotateNextSong::class => [
                ['annotateSongPath', 15],
                ['annotatePlaylist', 10],
                ['annotateRequest', 5],
                ['postAnnotation', -10],
            ],
        ];
    }

    /**
     * Pulls the next song from the AutoDJ, dispatches the AnnotateNextSong event and returns the built result.
     *
     * @param Entity\Station $station
     * @param bool $asAutoDj
     */
    public function annotateNextSong(
        Entity\Station $station,
        bool $asAutoDj = false,
    ): string {
        $queueRow = $this->queueRepo->getNextToSendToAutoDj($station);

        if (null === $queueRow) {
            throw new RuntimeException('Queue is empty for station.');
        }

        $event = AnnotateNextSong::fromStationQueue($queueRow, $asAutoDj);
        $this->eventDispatcher->dispatch($event);

        return $event->buildAnnotations();
    }

    public function annotateSongPath(AnnotateNextSong $event): void
    {
        $media = $event->getMedia();
        if ($media instanceof Entity\StationMedia) {
            $event->setSongPath('media:' . ltrim($media->getPath(), '/'));

            $backend = $this->adapters->getBackendAdapter($event->getStation());
            $event->addAnnotations($backend->annotateMedia($media));
        } else {
            $queue = $event->getQueue();
            if ($queue instanceof Entity\StationQueue) {
                $customUri = $queue->getAutodjCustomUri();
                if (!empty($customUri)) {
                    $event->setSongPath($customUri);
                }
            }
        }
    }

    public function annotatePlaylist(AnnotateNextSong $event): void
    {
        $playlist = $event->getPlaylist();
        if (null === $playlist) {
            return;
        }

        if ($playlist->getIsJingle()) {
            $event->addAnnotations([
                'jingle_mode' => 'true',
            ]);
        } else {
            $event->addAnnotations([
                'playlist_id' => $playlist->getId(),
            ]);
        }
    }

    public function annotateRequest(AnnotateNextSong $event): void
    {
        $request = $event->getRequest();
        if ($request instanceof Entity\StationRequest) {
            $event->addAnnotations([
                'request_id' => $request->getId(),
            ]);
        }
    }

    public function postAnnotation(AnnotateNextSong $event): void
    {
        if (!$event->isAsAutoDj()) {
            return;
        }

        $queueRow = $event->getQueue();
        if ($queueRow instanceof Entity\StationQueue) {
            $queueRow->setSentToAutodj();
            $queueRow->setTimestampCued(time());
            $this->em->persist($queueRow);
        }

        // The "get next song" function is only called when a streamer is not live.
        $this->streamerRepo->onDisconnect($event->getStation());
        $this->em->flush();
    }
}