<?php

namespace NoccyLabs\Mercureact\Broker\Subscriber;

use Evenement\EventEmitterInterface;
use Evenement\EventEmitterTrait;
use NoccyLabs\Mercureact\Broker\Message;
use NoccyLabs\Mercureact\Broker\TopicManager;
use NoccyLabs\React\WebSocket\WebSocketConnection;
use NoccyLabs\SimpleJWT\JWTToken;
use Psr\Http\Message\ServerRequestInterface;
use React\Stream\WritableStreamInterface;
use Symfony\Component\Uid\Uuid;

class WsSubscriber implements SubscriberInterface, EventEmitterInterface
{

    use EventEmitterTrait;

    const EVENT_SUBSCRIBE = 'subscribe';
    const EVENT_UNSUBSCRIBE = 'unsubscribe';
    const EVENT_ERROR = 'error';

    private string $id;

    public function __construct(
        private WebSocketConnection $stream,
        private ServerRequestInterface $request,
        private TopicManager $topicManager,
        private ?JWTToken $token = null
    )
    {
        $this->id = (string)Uuid::v7();
        $this->stream->on('text', $this->onWebSocketData(...));
    }

    private function onWebSocketData(string $data): void
    {
        $toks = str_getcsv($data, " ");
        switch (array_shift($toks)) {
            case 'auth':
                $this->stream->write('{"ok":true}');
                break;
            case 'subscribe':
                $this->topicManager->subscribe($this, $toks);
                $this->stream->write('{"ok":true}');
                break;
            case 'unsubscribe':
                $this->topicManager->unsubscribe($this, $toks);
                $this->stream->write('{"ok":true}');
                break;
            default:
                $this->stream->write('{"ok":false}');                
        }
    }

    public function deliver(Message $message): void
    {
        $this->stream->write(json_encode([
            'event' => $message->type,
            'topic' => $message->topic,
            'data' => $message->data
        ], JSON_UNESCAPED_SLASHES));
    }

    public function isAuthenticated(): bool
    {
        return $this->token && $this->token->isValid();
    }

    public function getMercureClaims(): ?array
    {
        return $this->request->getAttribute('mercure.claims');
    }

    public function getPayload(): array
    {
        return $this->request->getAttribute('mercure.payload')??[];
    }

    public function getId(): string
    {
        return "urn:uuid:".$this->id;
    }
}