<?php

namespace App\Integrations\Whmcs\Support;

use Illuminate\Support\Facades\DB;

/** Resolves a WHMCS registrar module slug (e.g. 'nhanhoa', 'PA') to the local `registrars.id`, matched case-insensitively on short_name. */
class RegistrarIdResolver
{
    /** @var array<string, int>|null lowercase short_name => registrar id */
    private static ?array $map = null;

    public function resolve(string $whmcsRegistrar): ?int
    {
        $whmcsRegistrar = trim($whmcsRegistrar);
        if ($whmcsRegistrar === '') {
            return null;
        }

        self::$map ??= DB::table('registrars')->pluck('id', 'short_name')
            ->mapWithKeys(fn ($id, $shortName) => [mb_strtolower($shortName) => $id])
            ->all();

        return self::$map[mb_strtolower($whmcsRegistrar)] ?? null;
    }
}