<?php

namespace App\Services\Malware;

use App\Jobs\ScanDocumentForMalware;
use Closure;
use Illuminate\Bus\UniqueLock;
use Illuminate\Contracts\Cache\Repository;
use Illuminate\Foundation\Queue\InteractsWithUniqueJobs;
use Illuminate\Support\Facades\Bus;

/** Observe the existing unique-job lease without claiming that a worker ran. */
final class DocumentScanDelivery
{
    use InteractsWithUniqueJobs;

    /** @param Closure():bool|null $prepare */
    public function dispatch(ScanDocumentForMalware $job, ?Closure $prepare = null): string
    {
        $lock = new UniqueLock(app(Repository::class));
        if (! $lock->acquire($job)) {
            return 'duplicate';
        }
        $attempted = false;
        $contextAdded = false;
        try {
            if ($prepare !== null && ! $prepare()) {
                return 'stale';
            }
            $this->addUniqueJobInformationToContext($job);
            $contextAdded = true;
            $attempted = true;
            Bus::dispatch($job);

            return 'accepted';
        } finally {
            if ($contextAdded) {
                $this->removeUniqueJobInformationFromContext($job);
            }
            // A push error may follow acceptance. Keep its lease until the worker or expiry.
            if (! $attempted) {
                $lock->release($job);
            }
        }
    }
}