<?php

namespace App\Jobs;

use App\Models\Domain;
use App\Models\DomainDkimKey;
use App\Models\DomainNsCheck;
use App\Jobs\ProvisionDomainSlaveZoneJob;
use App\Services\Dns\PowerDnsClient;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Http\Client\RequestException;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Str;

class ProvisionDomainZoneJob implements ShouldQueue
{
    use Dispatchable;
    use InteractsWithQueue;
    use Queueable;
    use SerializesModels;

    public int $tries = 5;

    public int $backoff = 60;

    public function __construct(public int $domainId)
    {
    }

    public function handle(PowerDnsClient $client): void
    {
        $domain = Domain::query()->find($this->domainId);
        if (! $domain) {
            return;
        }

        // Ensure DKIM keys exist before provisioning zone
        $this->ensureDkimKeys($domain);

        try {
            $client->ensureZone($domain);
            $this->logCheck($domain, 'success', 'PDNS zone provisioned successfully.');
            ProvisionDomainSlaveZoneJob::dispatch($domain->id);
        } catch (RequestException $exception) {
            $this->logCheck($domain, 'failed', $exception->getMessage());
            throw $exception;
        }
    }

    private function ensureDkimKeys(Domain $domain): void
    {
        $existing = DomainDkimKey::query()
            ->where('domain_id', $domain->id)
            ->where('status', 'active')
            ->latest('id')
            ->first();

        if ($existing) {
            return;
        }

        $prefix = (string) config('mailinfra.dkim_selector_prefix', 'ladill');
        $selector = Str::lower(trim($prefix)) ?: 'ladill';
        $selector .= '1';

        $config = [
            'digest_alg' => 'sha512',
            'private_key_bits' => 2048,
            'private_key_type' => OPENSSL_KEYTYPE_RSA,
        ];

        $res = openssl_pkey_new($config);
        openssl_pkey_export($res, $privateKey);
        $details = openssl_pkey_get_details($res);
        $publicKey = $details['key'] ?? '';

        $publicKey = preg_replace('/-----BEGIN PUBLIC KEY-----|-----END PUBLIC KEY-----|\s/', '', $publicKey);

        $privatePath = null;
        if (is_string($privateKey) && trim($privateKey) !== '') {
            $safeHost = Str::slug($domain->host, '_');
            $directory = storage_path('app/mail/dkim');
            File::ensureDirectoryExists($directory);
            $privatePath = $directory.'/'.$safeHost.'_'.$selector.'.key';
            File::put($privatePath, $privateKey);
        }

        DomainDkimKey::query()->create([
            'domain_id' => $domain->id,
            'selector' => $selector,
            'public_key_txt' => $publicKey,
            'private_key_path' => $privatePath,
            'status' => 'active',
        ]);
    }

    private function logCheck(Domain $domain, string $result, string $notes): void
    {
        DomainNsCheck::create([
            'domain_id' => $domain->id,
            'check_type' => 'pdns_provision',
            'result' => $result,
            'status_before' => (string) $domain->status,
            'status_after' => (string) $domain->status,
            'state_before' => (string) ($domain->onboarding_state ?? ''),
            'state_after' => (string) ($domain->onboarding_state ?? ''),
            'notes' => $notes,
            'checked_at' => now(),
        ]);
    }
}