<?php

namespace App\Integrations\Whmcs\Support;

use Illuminate\Support\Facades\DB;

/**
 * Resolves a WHMCS `tblorders.id` to the matching local `orders.id` via `orders.legacy_id`.
 * Orders must be synced (whmcs:sync-orders) before invoices for this to find anything.
 */
class OrderIdResolver
{
    /** @var array<int, int>|null legacy order id => local order id */
    private static ?array $map = null;

    public function resolve(int $whmcsOrderId): ?int
    {
        self::$map ??= DB::table('orders')->whereNotNull('legacy_id')->pluck('id', 'legacy_id')->all();

        return self::$map[$whmcsOrderId] ?? null;
    }
}