<?php

declare(strict_types=1);

namespace App\Broadcasting;

use App\Broadcasting\Entity\WebsocketEventData;
use App\Broadcasting\Events\WebsocketEvent;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Throwable;

final class RealtimeService
{
    /**
     * @param  RealtimeRoom|RealtimeRoom[]  $rooms
     * @param  array<string, scalar|null>   $data  Payload magro (ver nota acima)
     */
    public function emit(RealtimeEvent $event, RealtimeRoom|array $rooms, array $data = []): void
    {
        $targets = collect(is_array($rooms) ? $rooms : [$rooms])
            ->filter()
            ->keyBy(fn (RealtimeRoom $room): string => $room->name)
            ->values();

        if ($targets->isEmpty()) {
            return;
        }

        $payload = $data + ['at' => now()->toIso8601String()];

        DB::afterCommit(function () use ($event, $targets, $payload): void {
            foreach ($targets as $room) {
                $this->publish($event, $room, $payload);
            }
        });
    }

    /**
     * Atalho para o caso mais comum: avisar um usuario especifico.
     */
    public function emitToUser(RealtimeEvent $event, ?int $userId, array $data = []): void
    {
        if (! $userId) {
            return;
        }

        $this->emit($event, RealtimeRoom::user($userId), $data);
    }

    /**
     * @param  array<string, mixed>  $payload
     */
    private function publish(RealtimeEvent $event, RealtimeRoom $room, array $payload): void
    {
        try {
            event(new WebsocketEvent(
                WebsocketEventData::from(
                    room:  $room->name,
                    data:  $payload,
                    event: $event->value,
                )
            ));
        } catch (Throwable $e) {
            Log::warning('Falha ao emitir evento de tempo real', [
                'event'   => $event->value,
                'room'    => $room->name,
                'message' => $e->getMessage(),
            ]);
        }
    }
}