<?php

namespace App\Services\Licensing;

use App\Models\LicenseDeliveryOutbox;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\Mail;

final class LicenseDeliveryService
{
    public function deliverPending(int $limit = 20): int
    {
        $delivered = 0;
        $pending = LicenseDeliveryOutbox::query()
            ->whereNull('delivered_at')
            ->whereNotNull('recipient_email')
            ->where('recipient_email', '!=', '')
            ->oldest()
            ->limit(max(1, min($limit, 100)))
            ->get();

        foreach ($pending as $outbox) {
            $plain = Crypt::decryptString($outbox->encrypted_license_key);
            $recipient = strtolower(trim((string) $outbox->recipient_email));
            if ($recipient === '') {
                continue;
            }

            Mail::raw(
                "Thank you for choosing Rsync Studio.\n\nYour licence key is:\n\n{$plain}\n\nOpen Rsync Studio → Settings → Licence and enter this key to activate your Mac.\n\nKeep this key private. You can manage activations from the Rsync Studio licence portal.",
                fn ($message) => $message->to($recipient)->subject('Your Rsync Studio licence key')
            );

            $outbox->update(['delivered_at' => now()]);
            $delivered++;
        }

        return $delivered;
    }
}